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diff --git a/readline-4.3.orig/doc/readline.info b/readline-4.3.orig/doc/readline.info deleted file mode 100644 index 57dbdfa..0000000 --- a/readline-4.3.orig/doc/readline.info +++ /dev/null @@ -1,3638 +0,0 @@ -This is readline.info, produced by makeinfo version 4.1 from -/usr/homes/chet/src/bash/readline-src/doc/rlman.texinfo. - -INFO-DIR-SECTION Libraries -START-INFO-DIR-ENTRY -* Readline: (readline). The GNU readline library API -END-INFO-DIR-ENTRY - - This document describes the GNU Readline Library, a utility which -aids in the consistency of user interface across discrete programs that -need to provide a command line interface. - - Copyright (C) 1988-2002 Free Software Foundation, Inc. - - Permission is granted to make and distribute verbatim copies of this -manual provided the copyright notice and this permission notice pare -preserved on all copies. - - Permission is granted to copy and distribute modified versions of -this manual under the conditions for verbatim copying, provided that -the entire resulting derived work is distributed under the terms of a -permission notice identical to this one. - - Permission is granted to copy and distribute translations of this -manual into another language, under the above conditions for modified -versions, except that this permission notice may be stated in a -translation approved by the Free Software Foundation. - - -File: readline.info, Node: Top, Next: Command Line Editing, Up: (dir) - -GNU Readline Library -******************** - - This document describes the GNU Readline Library, a utility which -aids in the consistency of user interface across discrete programs that -need to provide a command line interface. - -* Menu: - -* Command Line Editing:: GNU Readline User's Manual. -* Programming with GNU Readline:: GNU Readline Programmer's Manual. -* Concept Index:: Index of concepts described in this manual. -* Function and Variable Index:: Index of externally visible functions - and variables. - - -File: readline.info, Node: Command Line Editing, Next: Programming with GNU Readline, Prev: Top, Up: Top - -Command Line Editing -******************** - - This chapter describes the basic features of the GNU command line -editing interface. - -* Menu: - -* Introduction and Notation:: Notation used in this text. -* Readline Interaction:: The minimum set of commands for editing a line. -* Readline Init File:: Customizing Readline from a user's view. -* Bindable Readline Commands:: A description of most of the Readline commands - available for binding -* Readline vi Mode:: A short description of how to make Readline - behave like the vi editor. - - -File: readline.info, Node: Introduction and Notation, Next: Readline Interaction, Up: Command Line Editing - -Introduction to Line Editing -============================ - - The following paragraphs describe the notation used to represent -keystrokes. - - The text `C-k' is read as `Control-K' and describes the character -produced when the <k> key is pressed while the Control key is depressed. - - The text `M-k' is read as `Meta-K' and describes the character -produced when the Meta key (if you have one) is depressed, and the <k> -key is pressed. The Meta key is labeled <ALT> on many keyboards. On -keyboards with two keys labeled <ALT> (usually to either side of the -space bar), the <ALT> on the left side is generally set to work as a -Meta key. The <ALT> key on the right may also be configured to work as -a Meta key or may be configured as some other modifier, such as a -Compose key for typing accented characters. - - If you do not have a Meta or <ALT> key, or another key working as a -Meta key, the identical keystroke can be generated by typing <ESC> -_first_, and then typing <k>. Either process is known as "metafying" -the <k> key. - - The text `M-C-k' is read as `Meta-Control-k' and describes the -character produced by "metafying" `C-k'. - - In addition, several keys have their own names. Specifically, -<DEL>, <ESC>, <LFD>, <SPC>, <RET>, and <TAB> all stand for themselves -when seen in this text, or in an init file (*note Readline Init File::). -If your keyboard lacks a <LFD> key, typing <C-j> will produce the -desired character. The <RET> key may be labeled <Return> or <Enter> on -some keyboards. - - -File: readline.info, Node: Readline Interaction, Next: Readline Init File, Prev: Introduction and Notation, Up: Command Line Editing - -Readline Interaction -==================== - - Often during an interactive session you type in a long line of text, -only to notice that the first word on the line is misspelled. The -Readline library gives you a set of commands for manipulating the text -as you type it in, allowing you to just fix your typo, and not forcing -you to retype the majority of the line. Using these editing commands, -you move the cursor to the place that needs correction, and delete or -insert the text of the corrections. Then, when you are satisfied with -the line, you simply press <RET>. You do not have to be at the end of -the line to press <RET>; the entire line is accepted regardless of the -location of the cursor within the line. - -* Menu: - -* Readline Bare Essentials:: The least you need to know about Readline. -* Readline Movement Commands:: Moving about the input line. -* Readline Killing Commands:: How to delete text, and how to get it back! -* Readline Arguments:: Giving numeric arguments to commands. -* Searching:: Searching through previous lines. - - -File: readline.info, Node: Readline Bare Essentials, Next: Readline Movement Commands, Up: Readline Interaction - -Readline Bare Essentials ------------------------- - - In order to enter characters into the line, simply type them. The -typed character appears where the cursor was, and then the cursor moves -one space to the right. If you mistype a character, you can use your -erase character to back up and delete the mistyped character. - - Sometimes you may mistype a character, and not notice the error -until you have typed several other characters. In that case, you can -type `C-b' to move the cursor to the left, and then correct your -mistake. Afterwards, you can move the cursor to the right with `C-f'. - - When you add text in the middle of a line, you will notice that -characters to the right of the cursor are `pushed over' to make room -for the text that you have inserted. Likewise, when you delete text -behind the cursor, characters to the right of the cursor are `pulled -back' to fill in the blank space created by the removal of the text. A -list of the bare essentials for editing the text of an input line -follows. - -`C-b' - Move back one character. - -`C-f' - Move forward one character. - -<DEL> or <Backspace> - Delete the character to the left of the cursor. - -`C-d' - Delete the character underneath the cursor. - -Printing characters - Insert the character into the line at the cursor. - -`C-_' or `C-x C-u' - Undo the last editing command. You can undo all the way back to an - empty line. - -(Depending on your configuration, the <Backspace> key be set to delete -the character to the left of the cursor and the <DEL> key set to delete -the character underneath the cursor, like `C-d', rather than the -character to the left of the cursor.) - - -File: readline.info, Node: Readline Movement Commands, Next: Readline Killing Commands, Prev: Readline Bare Essentials, Up: Readline Interaction - -Readline Movement Commands --------------------------- - - The above table describes the most basic keystrokes that you need in -order to do editing of the input line. For your convenience, many -other commands have been added in addition to `C-b', `C-f', `C-d', and -<DEL>. Here are some commands for moving more rapidly about the line. - -`C-a' - Move to the start of the line. - -`C-e' - Move to the end of the line. - -`M-f' - Move forward a word, where a word is composed of letters and - digits. - -`M-b' - Move backward a word. - -`C-l' - Clear the screen, reprinting the current line at the top. - - Notice how `C-f' moves forward a character, while `M-f' moves -forward a word. It is a loose convention that control keystrokes -operate on characters while meta keystrokes operate on words. - - -File: readline.info, Node: Readline Killing Commands, Next: Readline Arguments, Prev: Readline Movement Commands, Up: Readline Interaction - -Readline Killing Commands -------------------------- - - "Killing" text means to delete the text from the line, but to save -it away for later use, usually by "yanking" (re-inserting) it back into -the line. (`Cut' and `paste' are more recent jargon for `kill' and -`yank'.) - - If the description for a command says that it `kills' text, then you -can be sure that you can get the text back in a different (or the same) -place later. - - When you use a kill command, the text is saved in a "kill-ring". -Any number of consecutive kills save all of the killed text together, so -that when you yank it back, you get it all. The kill ring is not line -specific; the text that you killed on a previously typed line is -available to be yanked back later, when you are typing another line. - - Here is the list of commands for killing text. - -`C-k' - Kill the text from the current cursor position to the end of the - line. - -`M-d' - Kill from the cursor to the end of the current word, or, if between - words, to the end of the next word. Word boundaries are the same - as those used by `M-f'. - -`M-<DEL>' - Kill from the cursor the start of the current word, or, if between - words, to the start of the previous word. Word boundaries are the - same as those used by `M-b'. - -`C-w' - Kill from the cursor to the previous whitespace. This is - different than `M-<DEL>' because the word boundaries differ. - - Here is how to "yank" the text back into the line. Yanking means to -copy the most-recently-killed text from the kill buffer. - -`C-y' - Yank the most recently killed text back into the buffer at the - cursor. - -`M-y' - Rotate the kill-ring, and yank the new top. You can only do this - if the prior command is `C-y' or `M-y'. - - -File: readline.info, Node: Readline Arguments, Next: Searching, Prev: Readline Killing Commands, Up: Readline Interaction - -Readline Arguments ------------------- - - You can pass numeric arguments to Readline commands. Sometimes the -argument acts as a repeat count, other times it is the sign of the -argument that is significant. If you pass a negative argument to a -command which normally acts in a forward direction, that command will -act in a backward direction. For example, to kill text back to the -start of the line, you might type `M-- C-k'. - - The general way to pass numeric arguments to a command is to type -meta digits before the command. If the first `digit' typed is a minus -sign (`-'), then the sign of the argument will be negative. Once you -have typed one meta digit to get the argument started, you can type the -remainder of the digits, and then the command. For example, to give -the `C-d' command an argument of 10, you could type `M-1 0 C-d', which -will delete the next ten characters on the input line. - - -File: readline.info, Node: Searching, Prev: Readline Arguments, Up: Readline Interaction - -Searching for Commands in the History -------------------------------------- - - Readline provides commands for searching through the command history -for lines containing a specified string. There are two search modes: -"incremental" and "non-incremental". - - Incremental searches begin before the user has finished typing the -search string. As each character of the search string is typed, -Readline displays the next entry from the history matching the string -typed so far. An incremental search requires only as many characters -as needed to find the desired history entry. To search backward in the -history for a particular string, type `C-r'. Typing `C-s' searches -forward through the history. The characters present in the value of -the `isearch-terminators' variable are used to terminate an incremental -search. If that variable has not been assigned a value, the <ESC> and -`C-J' characters will terminate an incremental search. `C-g' will -abort an incremental search and restore the original line. When the -search is terminated, the history entry containing the search string -becomes the current line. - - To find other matching entries in the history list, type `C-r' or -`C-s' as appropriate. This will search backward or forward in the -history for the next entry matching the search string typed so far. -Any other key sequence bound to a Readline command will terminate the -search and execute that command. For instance, a <RET> will terminate -the search and accept the line, thereby executing the command from the -history list. A movement command will terminate the search, make the -last line found the current line, and begin editing. - - Readline remembers the last incremental search string. If two -`C-r's are typed without any intervening characters defining a new -search string, any remembered search string is used. - - Non-incremental searches read the entire search string before -starting to search for matching history lines. The search string may be -typed by the user or be part of the contents of the current line. - - -File: readline.info, Node: Readline Init File, Next: Bindable Readline Commands, Prev: Readline Interaction, Up: Command Line Editing - -Readline Init File -================== - - Although the Readline library comes with a set of Emacs-like -keybindings installed by default, it is possible to use a different set -of keybindings. Any user can customize programs that use Readline by -putting commands in an "inputrc" file, conventionally in his home -directory. The name of this file is taken from the value of the -environment variable `INPUTRC'. If that variable is unset, the default -is `~/.inputrc'. - - When a program which uses the Readline library starts up, the init -file is read, and the key bindings are set. - - In addition, the `C-x C-r' command re-reads this init file, thus -incorporating any changes that you might have made to it. - -* Menu: - -* Readline Init File Syntax:: Syntax for the commands in the inputrc file. - -* Conditional Init Constructs:: Conditional key bindings in the inputrc file. - -* Sample Init File:: An example inputrc file. - - -File: readline.info, Node: Readline Init File Syntax, Next: Conditional Init Constructs, Up: Readline Init File - -Readline Init File Syntax -------------------------- - - There are only a few basic constructs allowed in the Readline init -file. Blank lines are ignored. Lines beginning with a `#' are -comments. Lines beginning with a `$' indicate conditional constructs -(*note Conditional Init Constructs::). Other lines denote variable -settings and key bindings. - -Variable Settings - You can modify the run-time behavior of Readline by altering the - values of variables in Readline using the `set' command within the - init file. The syntax is simple: - - set VARIABLE VALUE - - Here, for example, is how to change from the default Emacs-like - key binding to use `vi' line editing commands: - - set editing-mode vi - - Variable names and values, where appropriate, are recognized - without regard to case. - - A great deal of run-time behavior is changeable with the following - variables. - - `bell-style' - Controls what happens when Readline wants to ring the - terminal bell. If set to `none', Readline never rings the - bell. If set to `visible', Readline uses a visible bell if - one is available. If set to `audible' (the default), - Readline attempts to ring the terminal's bell. - - `comment-begin' - The string to insert at the beginning of the line when the - `insert-comment' command is executed. The default value is - `"#"'. - - `completion-ignore-case' - If set to `on', Readline performs filename matching and - completion in a case-insensitive fashion. The default value - is `off'. - - `completion-query-items' - The number of possible completions that determines when the - user is asked whether he wants to see the list of - possibilities. If the number of possible completions is - greater than this value, Readline will ask the user whether - or not he wishes to view them; otherwise, they are simply - listed. This variable must be set to an integer value - greater than or equal to 0. The default limit is `100'. - - `convert-meta' - If set to `on', Readline will convert characters with the - eighth bit set to an ASCII key sequence by stripping the - eighth bit and prefixing an <ESC> character, converting them - to a meta-prefixed key sequence. The default value is `on'. - - `disable-completion' - If set to `On', Readline will inhibit word completion. - Completion characters will be inserted into the line as if - they had been mapped to `self-insert'. The default is `off'. - - `editing-mode' - The `editing-mode' variable controls which default set of key - bindings is used. By default, Readline starts up in Emacs - editing mode, where the keystrokes are most similar to Emacs. - This variable can be set to either `emacs' or `vi'. - - `enable-keypad' - When set to `on', Readline will try to enable the application - keypad when it is called. Some systems need this to enable - the arrow keys. The default is `off'. - - `expand-tilde' - If set to `on', tilde expansion is performed when Readline - attempts word completion. The default is `off'. - - If set to `on', the history code attempts to place point at - the same location on each history line retrived with - `previous-history' or `next-history'. - - `horizontal-scroll-mode' - This variable can be set to either `on' or `off'. Setting it - to `on' means that the text of the lines being edited will - scroll horizontally on a single screen line when they are - longer than the width of the screen, instead of wrapping onto - a new screen line. By default, this variable is set to `off'. - - `input-meta' - If set to `on', Readline will enable eight-bit input (it will - not clear the eighth bit in the characters it reads), - regardless of what the terminal claims it can support. The - default value is `off'. The name `meta-flag' is a synonym - for this variable. - - `isearch-terminators' - The string of characters that should terminate an incremental - search without subsequently executing the character as a - command (*note Searching::). If this variable has not been - given a value, the characters <ESC> and `C-J' will terminate - an incremental search. - - `keymap' - Sets Readline's idea of the current keymap for key binding - commands. Acceptable `keymap' names are `emacs', - `emacs-standard', `emacs-meta', `emacs-ctlx', `vi', `vi-move', - `vi-command', and `vi-insert'. `vi' is equivalent to - `vi-command'; `emacs' is equivalent to `emacs-standard'. The - default value is `emacs'. The value of the `editing-mode' - variable also affects the default keymap. - - `mark-directories' - If set to `on', completed directory names have a slash - appended. The default is `on'. - - `mark-modified-lines' - This variable, when set to `on', causes Readline to display an - asterisk (`*') at the start of history lines which have been - modified. This variable is `off' by default. - - `mark-symlinked-directories' - If set to `on', completed names which are symbolic links to - directories have a slash appended (subject to the value of - `mark-directories'). The default is `off'. - - `match-hidden-files' - This variable, when set to `on', causes Readline to match - files whose names begin with a `.' (hidden files) when - performing filename completion, unless the leading `.' is - supplied by the user in the filename to be completed. This - variable is `on' by default. - - `output-meta' - If set to `on', Readline will display characters with the - eighth bit set directly rather than as a meta-prefixed escape - sequence. The default is `off'. - - `page-completions' - If set to `on', Readline uses an internal `more'-like pager - to display a screenful of possible completions at a time. - This variable is `on' by default. - - `print-completions-horizontally' - If set to `on', Readline will display completions with matches - sorted horizontally in alphabetical order, rather than down - the screen. The default is `off'. - - `show-all-if-ambiguous' - This alters the default behavior of the completion functions. - If set to `on', words which have more than one possible - completion cause the matches to be listed immediately instead - of ringing the bell. The default value is `off'. - - `visible-stats' - If set to `on', a character denoting a file's type is - appended to the filename when listing possible completions. - The default is `off'. - -Key Bindings - The syntax for controlling key bindings in the init file is - simple. First you need to find the name of the command that you - want to change. The following sections contain tables of the - command name, the default keybinding, if any, and a short - description of what the command does. - - Once you know the name of the command, simply place on a line in - the init file the name of the key you wish to bind the command to, - a colon, and then the name of the command. The name of the key - can be expressed in different ways, depending on what you find most - comfortable. - - In addition to command names, readline allows keys to be bound to - a string that is inserted when the key is pressed (a MACRO). - - KEYNAME: FUNCTION-NAME or MACRO - KEYNAME is the name of a key spelled out in English. For - example: - Control-u: universal-argument - Meta-Rubout: backward-kill-word - Control-o: "> output" - - In the above example, `C-u' is bound to the function - `universal-argument', `M-DEL' is bound to the function - `backward-kill-word', and `C-o' is bound to run the macro - expressed on the right hand side (that is, to insert the text - `> output' into the line). - - A number of symbolic character names are recognized while - processing this key binding syntax: DEL, ESC, ESCAPE, LFD, - NEWLINE, RET, RETURN, RUBOUT, SPACE, SPC, and TAB. - - "KEYSEQ": FUNCTION-NAME or MACRO - KEYSEQ differs from KEYNAME above in that strings denoting an - entire key sequence can be specified, by placing the key - sequence in double quotes. Some GNU Emacs style key escapes - can be used, as in the following example, but the special - character names are not recognized. - - "\C-u": universal-argument - "\C-x\C-r": re-read-init-file - "\e[11~": "Function Key 1" - - In the above example, `C-u' is again bound to the function - `universal-argument' (just as it was in the first example), - `C-x C-r' is bound to the function `re-read-init-file', and - `<ESC> <[> <1> <1> <~>' is bound to insert the text `Function - Key 1'. - - The following GNU Emacs style escape sequences are available when - specifying key sequences: - - `\C-' - control prefix - - `\M-' - meta prefix - - `\e' - an escape character - - `\\' - backslash - - `\"' - <">, a double quotation mark - - `\'' - <'>, a single quote or apostrophe - - In addition to the GNU Emacs style escape sequences, a second set - of backslash escapes is available: - - `\a' - alert (bell) - - `\b' - backspace - - `\d' - delete - - `\f' - form feed - - `\n' - newline - - `\r' - carriage return - - `\t' - horizontal tab - - `\v' - vertical tab - - `\NNN' - the eight-bit character whose value is the octal value NNN - (one to three digits) - - `\xHH' - the eight-bit character whose value is the hexadecimal value - HH (one or two hex digits) - - When entering the text of a macro, single or double quotes must be - used to indicate a macro definition. Unquoted text is assumed to - be a function name. In the macro body, the backslash escapes - described above are expanded. Backslash will quote any other - character in the macro text, including `"' and `''. For example, - the following binding will make `C-x \' insert a single `\' into - the line: - "\C-x\\": "\\" - - -File: readline.info, Node: Conditional Init Constructs, Next: Sample Init File, Prev: Readline Init File Syntax, Up: Readline Init File - -Conditional Init Constructs ---------------------------- - - Readline implements a facility similar in spirit to the conditional -compilation features of the C preprocessor which allows key bindings -and variable settings to be performed as the result of tests. There -are four parser directives used. - -`$if' - The `$if' construct allows bindings to be made based on the - editing mode, the terminal being used, or the application using - Readline. The text of the test extends to the end of the line; no - characters are required to isolate it. - - `mode' - The `mode=' form of the `$if' directive is used to test - whether Readline is in `emacs' or `vi' mode. This may be - used in conjunction with the `set keymap' command, for - instance, to set bindings in the `emacs-standard' and - `emacs-ctlx' keymaps only if Readline is starting out in - `emacs' mode. - - `term' - The `term=' form may be used to include terminal-specific key - bindings, perhaps to bind the key sequences output by the - terminal's function keys. The word on the right side of the - `=' is tested against both the full name of the terminal and - the portion of the terminal name before the first `-'. This - allows `sun' to match both `sun' and `sun-cmd', for instance. - - `application' - The APPLICATION construct is used to include - application-specific settings. Each program using the - Readline library sets the APPLICATION NAME, and you can test - for a particular value. This could be used to bind key - sequences to functions useful for a specific program. For - instance, the following command adds a key sequence that - quotes the current or previous word in Bash: - $if Bash - # Quote the current or previous word - "\C-xq": "\eb\"\ef\"" - $endif - -`$endif' - This command, as seen in the previous example, terminates an `$if' - command. - -`$else' - Commands in this branch of the `$if' directive are executed if the - test fails. - -`$include' - This directive takes a single filename as an argument and reads - commands and bindings from that file. For example, the following - directive reads from `/etc/inputrc': - $include /etc/inputrc - - -File: readline.info, Node: Sample Init File, Prev: Conditional Init Constructs, Up: Readline Init File - -Sample Init File ----------------- - - Here is an example of an INPUTRC file. This illustrates key -binding, variable assignment, and conditional syntax. - - - # This file controls the behaviour of line input editing for - # programs that use the GNU Readline library. Existing - # programs include FTP, Bash, and GDB. - # - # You can re-read the inputrc file with C-x C-r. - # Lines beginning with '#' are comments. - # - # First, include any systemwide bindings and variable - # assignments from /etc/Inputrc - $include /etc/Inputrc - - # - # Set various bindings for emacs mode. - - set editing-mode emacs - - $if mode=emacs - - Meta-Control-h: backward-kill-word Text after the function name is ignored - - # - # Arrow keys in keypad mode - # - #"\M-OD": backward-char - #"\M-OC": forward-char - #"\M-OA": previous-history - #"\M-OB": next-history - # - # Arrow keys in ANSI mode - # - "\M-[D": backward-char - "\M-[C": forward-char - "\M-[A": previous-history - "\M-[B": next-history - # - # Arrow keys in 8 bit keypad mode - # - #"\M-\C-OD": backward-char - #"\M-\C-OC": forward-char - #"\M-\C-OA": previous-history - #"\M-\C-OB": next-history - # - # Arrow keys in 8 bit ANSI mode - # - #"\M-\C-[D": backward-char - #"\M-\C-[C": forward-char - #"\M-\C-[A": previous-history - #"\M-\C-[B": next-history - - C-q: quoted-insert - - $endif - - # An old-style binding. This happens to be the default. - TAB: complete - - # Macros that are convenient for shell interaction - $if Bash - # edit the path - "\C-xp": "PATH=${PATH}\e\C-e\C-a\ef\C-f" - # prepare to type a quoted word -- - # insert open and close double quotes - # and move to just after the open quote - "\C-x\"": "\"\"\C-b" - # insert a backslash (testing backslash escapes - # in sequences and macros) - "\C-x\\": "\\" - # Quote the current or previous word - "\C-xq": "\eb\"\ef\"" - # Add a binding to refresh the line, which is unbound - "\C-xr": redraw-current-line - # Edit variable on current line. - "\M-\C-v": "\C-a\C-k$\C-y\M-\C-e\C-a\C-y=" - $endif - - # use a visible bell if one is available - set bell-style visible - - # don't strip characters to 7 bits when reading - set input-meta on - - # allow iso-latin1 characters to be inserted rather - # than converted to prefix-meta sequences - set convert-meta off - - # display characters with the eighth bit set directly - # rather than as meta-prefixed characters - set output-meta on - - # if there are more than 150 possible completions for - # a word, ask the user if he wants to see all of them - set completion-query-items 150 - - # For FTP - $if Ftp - "\C-xg": "get \M-?" - "\C-xt": "put \M-?" - "\M-.": yank-last-arg - $endif - - -File: readline.info, Node: Bindable Readline Commands, Next: Readline vi Mode, Prev: Readline Init File, Up: Command Line Editing - -Bindable Readline Commands -========================== - -* Menu: - -* Commands For Moving:: Moving about the line. -* Commands For History:: Getting at previous lines. -* Commands For Text:: Commands for changing text. -* Commands For Killing:: Commands for killing and yanking. -* Numeric Arguments:: Specifying numeric arguments, repeat counts. -* Commands For Completion:: Getting Readline to do the typing for you. -* Keyboard Macros:: Saving and re-executing typed characters -* Miscellaneous Commands:: Other miscellaneous commands. - - This section describes Readline commands that may be bound to key -sequences. Command names without an accompanying key sequence are -unbound by default. - - In the following descriptions, "point" refers to the current cursor -position, and "mark" refers to a cursor position saved by the -`set-mark' command. The text between the point and mark is referred to -as the "region". - - -File: readline.info, Node: Commands For Moving, Next: Commands For History, Up: Bindable Readline Commands - -Commands For Moving -------------------- - -`beginning-of-line (C-a)' - Move to the start of the current line. - -`end-of-line (C-e)' - Move to the end of the line. - -`forward-char (C-f)' - Move forward a character. - -`backward-char (C-b)' - Move back a character. - -`forward-word (M-f)' - Move forward to the end of the next word. Words are composed of - letters and digits. - -`backward-word (M-b)' - Move back to the start of the current or previous word. Words are - composed of letters and digits. - -`clear-screen (C-l)' - Clear the screen and redraw the current line, leaving the current - line at the top of the screen. - -`redraw-current-line ()' - Refresh the current line. By default, this is unbound. - - -File: readline.info, Node: Commands For History, Next: Commands For Text, Prev: Commands For Moving, Up: Bindable Readline Commands - -Commands For Manipulating The History -------------------------------------- - -`accept-line (Newline or Return)' - Accept the line regardless of where the cursor is. If this line is - non-empty, it may be added to the history list for future recall - with `add_history()'. If this line is a modified history line, - the history line is restored to its original state. - -`previous-history (C-p)' - Move `back' through the history list, fetching the previous - command. - -`next-history (C-n)' - Move `forward' through the history list, fetching the next command. - -`beginning-of-history (M-<)' - Move to the first line in the history. - -`end-of-history (M->)' - Move to the end of the input history, i.e., the line currently - being entered. - -`reverse-search-history (C-r)' - Search backward starting at the current line and moving `up' - through the history as necessary. This is an incremental search. - -`forward-search-history (C-s)' - Search forward starting at the current line and moving `down' - through the the history as necessary. This is an incremental - search. - -`non-incremental-reverse-search-history (M-p)' - Search backward starting at the current line and moving `up' - through the history as necessary using a non-incremental search - for a string supplied by the user. - -`non-incremental-forward-search-history (M-n)' - Search forward starting at the current line and moving `down' - through the the history as necessary using a non-incremental search - for a string supplied by the user. - -`history-search-forward ()' - Search forward through the history for the string of characters - between the start of the current line and the point. This is a - non-incremental search. By default, this command is unbound. - -`history-search-backward ()' - Search backward through the history for the string of characters - between the start of the current line and the point. This is a - non-incremental search. By default, this command is unbound. - -`yank-nth-arg (M-C-y)' - Insert the first argument to the previous command (usually the - second word on the previous line) at point. With an argument N, - insert the Nth word from the previous command (the words in the - previous command begin with word 0). A negative argument inserts - the Nth word from the end of the previous command. - -`yank-last-arg (M-. or M-_)' - Insert last argument to the previous command (the last word of the - previous history entry). With an argument, behave exactly like - `yank-nth-arg'. Successive calls to `yank-last-arg' move back - through the history list, inserting the last argument of each line - in turn. - - -File: readline.info, Node: Commands For Text, Next: Commands For Killing, Prev: Commands For History, Up: Bindable Readline Commands - -Commands For Changing Text --------------------------- - -`delete-char (C-d)' - Delete the character at point. If point is at the beginning of - the line, there are no characters in the line, and the last - character typed was not bound to `delete-char', then return EOF. - -`backward-delete-char (Rubout)' - Delete the character behind the cursor. A numeric argument means - to kill the characters instead of deleting them. - -`forward-backward-delete-char ()' - Delete the character under the cursor, unless the cursor is at the - end of the line, in which case the character behind the cursor is - deleted. By default, this is not bound to a key. - -`quoted-insert (C-q or C-v)' - Add the next character typed to the line verbatim. This is how to - insert key sequences like `C-q', for example. - -`tab-insert (M-<TAB>)' - Insert a tab character. - -`self-insert (a, b, A, 1, !, ...)' - Insert yourself. - -`transpose-chars (C-t)' - Drag the character before the cursor forward over the character at - the cursor, moving the cursor forward as well. If the insertion - point is at the end of the line, then this transposes the last two - characters of the line. Negative arguments have no effect. - -`transpose-words (M-t)' - Drag the word before point past the word after point, moving point - past that word as well. If the insertion point is at the end of - the line, this transposes the last two words on the line. - -`upcase-word (M-u)' - Uppercase the current (or following) word. With a negative - argument, uppercase the previous word, but do not move the cursor. - -`downcase-word (M-l)' - Lowercase the current (or following) word. With a negative - argument, lowercase the previous word, but do not move the cursor. - -`capitalize-word (M-c)' - Capitalize the current (or following) word. With a negative - argument, capitalize the previous word, but do not move the cursor. - -`overwrite-mode ()' - Toggle overwrite mode. With an explicit positive numeric argument, - switches to overwrite mode. With an explicit non-positive numeric - argument, switches to insert mode. This command affects only - `emacs' mode; `vi' mode does overwrite differently. Each call to - `readline()' starts in insert mode. - - In overwrite mode, characters bound to `self-insert' replace the - text at point rather than pushing the text to the right. - Characters bound to `backward-delete-char' replace the character - before point with a space. - - By default, this command is unbound. - - -File: readline.info, Node: Commands For Killing, Next: Numeric Arguments, Prev: Commands For Text, Up: Bindable Readline Commands - -Killing And Yanking -------------------- - -`kill-line (C-k)' - Kill the text from point to the end of the line. - -`backward-kill-line (C-x Rubout)' - Kill backward to the beginning of the line. - -`unix-line-discard (C-u)' - Kill backward from the cursor to the beginning of the current line. - -`kill-whole-line ()' - Kill all characters on the current line, no matter where point is. - By default, this is unbound. - -`kill-word (M-d)' - Kill from point to the end of the current word, or if between - words, to the end of the next word. Word boundaries are the same - as `forward-word'. - -`backward-kill-word (M-<DEL>)' - Kill the word behind point. Word boundaries are the same as - `backward-word'. - -`unix-word-rubout (C-w)' - Kill the word behind point, using white space as a word boundary. - The killed text is saved on the kill-ring. - -`delete-horizontal-space ()' - Delete all spaces and tabs around point. By default, this is - unbound. - -`kill-region ()' - Kill the text in the current region. By default, this command is - unbound. - -`copy-region-as-kill ()' - Copy the text in the region to the kill buffer, so it can be yanked - right away. By default, this command is unbound. - -`copy-backward-word ()' - Copy the word before point to the kill buffer. The word - boundaries are the same as `backward-word'. By default, this - command is unbound. - -`copy-forward-word ()' - Copy the word following point to the kill buffer. The word - boundaries are the same as `forward-word'. By default, this - command is unbound. - -`yank (C-y)' - Yank the top of the kill ring into the buffer at point. - -`yank-pop (M-y)' - Rotate the kill-ring, and yank the new top. You can only do this - if the prior command is `yank' or `yank-pop'. - - -File: readline.info, Node: Numeric Arguments, Next: Commands For Completion, Prev: Commands For Killing, Up: Bindable Readline Commands - -Specifying Numeric Arguments ----------------------------- - -`digit-argument (M-0, M-1, ... M--)' - Add this digit to the argument already accumulating, or start a new - argument. `M--' starts a negative argument. - -`universal-argument ()' - This is another way to specify an argument. If this command is - followed by one or more digits, optionally with a leading minus - sign, those digits define the argument. If the command is - followed by digits, executing `universal-argument' again ends the - numeric argument, but is otherwise ignored. As a special case, if - this command is immediately followed by a character that is - neither a digit or minus sign, the argument count for the next - command is multiplied by four. The argument count is initially - one, so executing this function the first time makes the argument - count four, a second time makes the argument count sixteen, and so - on. By default, this is not bound to a key. - - -File: readline.info, Node: Commands For Completion, Next: Keyboard Macros, Prev: Numeric Arguments, Up: Bindable Readline Commands - -Letting Readline Type For You ------------------------------ - -`complete (<TAB>)' - Attempt to perform completion on the text before point. The - actual completion performed is application-specific. The default - is filename completion. - -`possible-completions (M-?)' - List the possible completions of the text before point. - -`insert-completions (M-*)' - Insert all completions of the text before point that would have - been generated by `possible-completions'. - -`menu-complete ()' - Similar to `complete', but replaces the word to be completed with - a single match from the list of possible completions. Repeated - execution of `menu-complete' steps through the list of possible - completions, inserting each match in turn. At the end of the list - of completions, the bell is rung (subject to the setting of - `bell-style') and the original text is restored. An argument of N - moves N positions forward in the list of matches; a negative - argument may be used to move backward through the list. This - command is intended to be bound to <TAB>, but is unbound by - default. - -`delete-char-or-list ()' - Deletes the character under the cursor if not at the beginning or - end of the line (like `delete-char'). If at the end of the line, - behaves identically to `possible-completions'. This command is - unbound by default. - - -File: readline.info, Node: Keyboard Macros, Next: Miscellaneous Commands, Prev: Commands For Completion, Up: Bindable Readline Commands - -Keyboard Macros ---------------- - -`start-kbd-macro (C-x ()' - Begin saving the characters typed into the current keyboard macro. - -`end-kbd-macro (C-x ))' - Stop saving the characters typed into the current keyboard macro - and save the definition. - -`call-last-kbd-macro (C-x e)' - Re-execute the last keyboard macro defined, by making the - characters in the macro appear as if typed at the keyboard. - - -File: readline.info, Node: Miscellaneous Commands, Prev: Keyboard Macros, Up: Bindable Readline Commands - -Some Miscellaneous Commands ---------------------------- - -`re-read-init-file (C-x C-r)' - Read in the contents of the INPUTRC file, and incorporate any - bindings or variable assignments found there. - -`abort (C-g)' - Abort the current editing command and ring the terminal's bell - (subject to the setting of `bell-style'). - -`do-uppercase-version (M-a, M-b, M-X, ...)' - If the metafied character X is lowercase, run the command that is - bound to the corresponding uppercase character. - -`prefix-meta (<ESC>)' - Metafy the next character typed. This is for keyboards without a - meta key. Typing `<ESC> f' is equivalent to typing `M-f'. - -`undo (C-_ or C-x C-u)' - Incremental undo, separately remembered for each line. - -`revert-line (M-r)' - Undo all changes made to this line. This is like executing the - `undo' command enough times to get back to the beginning. - -`tilde-expand (M-~)' - Perform tilde expansion on the current word. - -`set-mark (C-@)' - Set the mark to the point. If a numeric argument is supplied, the - mark is set to that position. - -`exchange-point-and-mark (C-x C-x)' - Swap the point with the mark. The current cursor position is set - to the saved position, and the old cursor position is saved as the - mark. - -`character-search (C-])' - A character is read and point is moved to the next occurrence of - that character. A negative count searches for previous - occurrences. - -`character-search-backward (M-C-])' - A character is read and point is moved to the previous occurrence - of that character. A negative count searches for subsequent - occurrences. - -`insert-comment (M-#)' - Without a numeric argument, the value of the `comment-begin' - variable is inserted at the beginning of the current line. If a - numeric argument is supplied, this command acts as a toggle: if - the characters at the beginning of the line do not match the value - of `comment-begin', the value is inserted, otherwise the - characters in `comment-begin' are deleted from the beginning of - the line. In either case, the line is accepted as if a newline - had been typed. - -`dump-functions ()' - Print all of the functions and their key bindings to the Readline - output stream. If a numeric argument is supplied, the output is - formatted in such a way that it can be made part of an INPUTRC - file. This command is unbound by default. - -`dump-variables ()' - Print all of the settable variables and their values to the - Readline output stream. If a numeric argument is supplied, the - output is formatted in such a way that it can be made part of an - INPUTRC file. This command is unbound by default. - -`dump-macros ()' - Print all of the Readline key sequences bound to macros and the - strings they output. If a numeric argument is supplied, the - output is formatted in such a way that it can be made part of an - INPUTRC file. This command is unbound by default. - -`emacs-editing-mode (C-e)' - When in `vi' command mode, this causes a switch to `emacs' editing - mode. - -`vi-editing-mode (M-C-j)' - When in `emacs' editing mode, this causes a switch to `vi' editing - mode. - - -File: readline.info, Node: Readline vi Mode, Prev: Bindable Readline Commands, Up: Command Line Editing - -Readline vi Mode -================ - - While the Readline library does not have a full set of `vi' editing -functions, it does contain enough to allow simple editing of the line. -The Readline `vi' mode behaves as specified in the POSIX 1003.2 -standard. - - In order to switch interactively between `emacs' and `vi' editing -modes, use the command `M-C-j' (bound to emacs-editing-mode when in -`vi' mode and to vi-editing-mode in `emacs' mode). The Readline -default is `emacs' mode. - - When you enter a line in `vi' mode, you are already placed in -`insertion' mode, as if you had typed an `i'. Pressing <ESC> switches -you into `command' mode, where you can edit the text of the line with -the standard `vi' movement keys, move to previous history lines with -`k' and subsequent lines with `j', and so forth. - - This document describes the GNU Readline Library, a utility for -aiding in the consitency of user interface across discrete programs -that need to provide a command line interface. - - Copyright (C) 1988-2002 Free Software Foundation, Inc. - - Permission is granted to make and distribute verbatim copies of this -manual provided the copyright notice and this permission notice pare -preserved on all copies. - - Permission is granted to copy and distribute modified versions of -this manual under the conditions for verbatim copying, provided that -the entire resulting derived work is distributed under the terms of a -permission notice identical to this one. - - Permission is granted to copy and distribute translations of this -manual into another language, under the above conditions for modified -versions, except that this permission notice may be stated in a -translation approved by the Foundation. - - -File: readline.info, Node: Programming with GNU Readline, Next: Concept Index, Prev: Command Line Editing, Up: Top - -Programming with GNU Readline -***************************** - - This chapter describes the interface between the GNU Readline -Library and other programs. If you are a programmer, and you wish to -include the features found in GNU Readline such as completion, line -editing, and interactive history manipulation in your own programs, -this section is for you. - -* Menu: - -* Basic Behavior:: Using the default behavior of Readline. -* Custom Functions:: Adding your own functions to Readline. -* Readline Variables:: Variables accessible to custom - functions. -* Readline Convenience Functions:: Functions which Readline supplies to - aid in writing your own custom - functions. -* Readline Signal Handling:: How Readline behaves when it receives signals. -* Custom Completers:: Supplanting or supplementing Readline's - completion functions. - - -File: readline.info, Node: Basic Behavior, Next: Custom Functions, Up: Programming with GNU Readline - -Basic Behavior -============== - - Many programs provide a command line interface, such as `mail', -`ftp', and `sh'. For such programs, the default behaviour of Readline -is sufficient. This section describes how to use Readline in the -simplest way possible, perhaps to replace calls in your code to -`gets()' or `fgets()'. - - The function `readline()' prints a prompt PROMPT and then reads and -returns a single line of text from the user. If PROMPT is `NULL' or -the empty string, no prompt is displayed. The line `readline' returns -is allocated with `malloc()'; the caller should `free()' the line when -it has finished with it. The declaration for `readline' in ANSI C is - - `char *readline (const char *PROMPT);' - -So, one might say - `char *line = readline ("Enter a line: ");' - -in order to read a line of text from the user. The line returned has -the final newline removed, so only the text remains. - - If `readline' encounters an `EOF' while reading the line, and the -line is empty at that point, then `(char *)NULL' is returned. -Otherwise, the line is ended just as if a newline had been typed. - - If you want the user to be able to get at the line later, (with -<C-p> for example), you must call `add_history()' to save the line away -in a "history" list of such lines. - - `add_history (line)'; - -For full details on the GNU History Library, see the associated manual. - - It is preferable to avoid saving empty lines on the history list, -since users rarely have a burning need to reuse a blank line. Here is -a function which usefully replaces the standard `gets()' library -function, and has the advantage of no static buffer to overflow: - - /* A static variable for holding the line. */ - static char *line_read = (char *)NULL; - - /* Read a string, and return a pointer to it. - Returns NULL on EOF. */ - char * - rl_gets () - { - /* If the buffer has already been allocated, - return the memory to the free pool. */ - if (line_read) - { - free (line_read); - line_read = (char *)NULL; - } - - /* Get a line from the user. */ - line_read = readline (""); - - /* If the line has any text in it, - save it on the history. */ - if (line_read && *line_read) - add_history (line_read); - - return (line_read); - } - - This function gives the user the default behaviour of <TAB> -completion: completion on file names. If you do not want Readline to -complete on filenames, you can change the binding of the <TAB> key with -`rl_bind_key()'. - - `int rl_bind_key (int KEY, rl_command_func_t *FUNCTION);' - - `rl_bind_key()' takes two arguments: KEY is the character that you -want to bind, and FUNCTION is the address of the function to call when -KEY is pressed. Binding <TAB> to `rl_insert()' makes <TAB> insert -itself. `rl_bind_key()' returns non-zero if KEY is not a valid ASCII -character code (between 0 and 255). - - Thus, to disable the default <TAB> behavior, the following suffices: - `rl_bind_key ('\t', rl_insert);' - - This code should be executed once at the start of your program; you -might write a function called `initialize_readline()' which performs -this and other desired initializations, such as installing custom -completers (*note Custom Completers::). - - -File: readline.info, Node: Custom Functions, Next: Readline Variables, Prev: Basic Behavior, Up: Programming with GNU Readline - -Custom Functions -================ - - Readline provides many functions for manipulating the text of the -line, but it isn't possible to anticipate the needs of all programs. -This section describes the various functions and variables defined -within the Readline library which allow a user program to add -customized functionality to Readline. - - Before declaring any functions that customize Readline's behavior, or -using any functionality Readline provides in other code, an application -writer should include the file `<readline/readline.h>' in any file that -uses Readline's features. Since some of the definitions in -`readline.h' use the `stdio' library, the file `<stdio.h>' should be -included before `readline.h'. - - `readline.h' defines a C preprocessor variable that should be -treated as an integer, `RL_READLINE_VERSION', which may be used to -conditionally compile application code depending on the installed -Readline version. The value is a hexadecimal encoding of the major and -minor version numbers of the library, of the form 0xMMMM. MM is the -two-digit major version number; MM is the two-digit minor version -number. For Readline 4.2, for example, the value of -`RL_READLINE_VERSION' would be `0x0402'. - -* Menu: - -* Readline Typedefs:: C declarations to make code readable. -* Function Writing:: Variables and calling conventions. - - -File: readline.info, Node: Readline Typedefs, Next: Function Writing, Up: Custom Functions - -Readline Typedefs ------------------ - - For readabilty, we declare a number of new object types, all pointers -to functions. - - The reason for declaring these new types is to make it easier to -write code describing pointers to C functions with appropriately -prototyped arguments and return values. - - For instance, say we want to declare a variable FUNC as a pointer to -a function which takes two `int' arguments and returns an `int' (this -is the type of all of the Readline bindable functions). Instead of the -classic C declaration - - `int (*func)();' - -or the ANSI-C style declaration - - `int (*func)(int, int);' - -we may write - - `rl_command_func_t *func;' - - The full list of function pointer types available is - -`typedef int rl_command_func_t (int, int);' - -`typedef char *rl_compentry_func_t (const char *, int);' - -`typedef char **rl_completion_func_t (const char *, int, int);' - -`typedef char *rl_quote_func_t (char *, int, char *);' - -`typedef char *rl_dequote_func_t (char *, int);' - -`typedef int rl_compignore_func_t (char **);' - -`typedef void rl_compdisp_func_t (char **, int, int);' - -`typedef int rl_hook_func_t (void);' - -`typedef int rl_getc_func_t (FILE *);' - -`typedef int rl_linebuf_func_t (char *, int);' - -`typedef int rl_intfunc_t (int);' - -`#define rl_ivoidfunc_t rl_hook_func_t' - -`typedef int rl_icpfunc_t (char *);' - -`typedef int rl_icppfunc_t (char **);' - -`typedef void rl_voidfunc_t (void);' - -`typedef void rl_vintfunc_t (int);' - -`typedef void rl_vcpfunc_t (char *);' - -`typedef void rl_vcppfunc_t (char **);' - -File: readline.info, Node: Function Writing, Prev: Readline Typedefs, Up: Custom Functions - -Writing a New Function ----------------------- - - In order to write new functions for Readline, you need to know the -calling conventions for keyboard-invoked functions, and the names of the -variables that describe the current state of the line read so far. - - The calling sequence for a command `foo' looks like - - `int foo (int count, int key)' - -where COUNT is the numeric argument (or 1 if defaulted) and KEY is the -key that invoked this function. - - It is completely up to the function as to what should be done with -the numeric argument. Some functions use it as a repeat count, some as -a flag, and others to choose alternate behavior (refreshing the current -line as opposed to refreshing the screen, for example). Some choose to -ignore it. In general, if a function uses the numeric argument as a -repeat count, it should be able to do something useful with both -negative and positive arguments. At the very least, it should be aware -that it can be passed a negative argument. - - A command function should return 0 if its action completes -successfully, and a non-zero value if some error occurs. - - -File: readline.info, Node: Readline Variables, Next: Readline Convenience Functions, Prev: Custom Functions, Up: Programming with GNU Readline - -Readline Variables -================== - - These variables are available to function writers. - - - Variable: char * rl_line_buffer - This is the line gathered so far. You are welcome to modify the - contents of the line, but see *Note Allowing Undoing::. The - function `rl_extend_line_buffer' is available to increase the - memory allocated to `rl_line_buffer'. - - - Variable: int rl_point - The offset of the current cursor position in `rl_line_buffer' (the - _point_). - - - Variable: int rl_end - The number of characters present in `rl_line_buffer'. When - `rl_point' is at the end of the line, `rl_point' and `rl_end' are - equal. - - - Variable: int rl_mark - The MARK (saved position) in the current line. If set, the mark - and point define a _region_. - - - Variable: int rl_done - Setting this to a non-zero value causes Readline to return the - current line immediately. - - - Variable: int rl_num_chars_to_read - Setting this to a positive value before calling `readline()' causes - Readline to return after accepting that many characters, rather - than reading up to a character bound to `accept-line'. - - - Variable: int rl_pending_input - Setting this to a value makes it the next keystroke read. This is - a way to stuff a single character into the input stream. - - - Variable: int rl_dispatching - Set to a non-zero value if a function is being called from a key - binding; zero otherwise. Application functions can test this to - discover whether they were called directly or by Readline's - dispatching mechanism. - - - Variable: int rl_erase_empty_line - Setting this to a non-zero value causes Readline to completely - erase the current line, including any prompt, any time a newline - is typed as the only character on an otherwise-empty line. The - cursor is moved to the beginning of the newly-blank line. - - - Variable: char * rl_prompt - The prompt Readline uses. This is set from the argument to - `readline()', and should not be assigned to directly. The - `rl_set_prompt()' function (*note Redisplay::) may be used to - modify the prompt string after calling `readline()'. - - - Variable: int rl_already_prompted - If an application wishes to display the prompt itself, rather than - have Readline do it the first time `readline()' is called, it - should set this variable to a non-zero value after displaying the - prompt. The prompt must also be passed as the argument to - `readline()' so the redisplay functions can update the display - properly. The calling application is responsible for managing the - value; Readline never sets it. - - - Variable: const char * rl_library_version - The version number of this revision of the library. - - - Variable: int rl_readline_version - An integer encoding the current version of the library. The - encoding is of the form 0xMMMM, where MM is the two-digit major - version number, and MM is the two-digit minor version number. For - example, for Readline-4.2, `rl_readline_version' would have the - value 0x0402. - - - Variable: int rl_gnu_readline_p - Always set to 1, denoting that this is GNU readline rather than - some emulation. - - - Variable: const char * rl_terminal_name - The terminal type, used for initialization. If not set by the - application, Readline sets this to the value of the `TERM' - environment variable the first time it is called. - - - Variable: const char * rl_readline_name - This variable is set to a unique name by each application using - Readline. The value allows conditional parsing of the inputrc file - (*note Conditional Init Constructs::). - - - Variable: FILE * rl_instream - The stdio stream from which Readline reads input. If `NULL', - Readline defaults to STDIN. - - - Variable: FILE * rl_outstream - The stdio stream to which Readline performs output. If `NULL', - Readline defaults to STDOUT. - - - Variable: rl_command_func_t * rl_last_func - The address of the last command function Readline executed. May - be used to test whether or not a function is being executed twice - in succession, for example. - - - Variable: rl_hook_func_t * rl_startup_hook - If non-zero, this is the address of a function to call just before - `readline' prints the first prompt. - - - Variable: rl_hook_func_t * rl_pre_input_hook - If non-zero, this is the address of a function to call after the - first prompt has been printed and just before `readline' starts - reading input characters. - - - Variable: rl_hook_func_t * rl_event_hook - If non-zero, this is the address of a function to call periodically - when Readline is waiting for terminal input. By default, this - will be called at most ten times a second if there is no keyboard - input. - - - Variable: rl_getc_func_t * rl_getc_function - If non-zero, Readline will call indirectly through this pointer to - get a character from the input stream. By default, it is set to - `rl_getc', the default Readline character input function (*note - Character Input::). - - - Variable: rl_voidfunc_t * rl_redisplay_function - If non-zero, Readline will call indirectly through this pointer to - update the display with the current contents of the editing buffer. - By default, it is set to `rl_redisplay', the default Readline - redisplay function (*note Redisplay::). - - - Variable: rl_vintfunc_t * rl_prep_term_function - If non-zero, Readline will call indirectly through this pointer to - initialize the terminal. The function takes a single argument, an - `int' flag that says whether or not to use eight-bit characters. - By default, this is set to `rl_prep_terminal' (*note Terminal - Management::). - - - Variable: rl_voidfunc_t * rl_deprep_term_function - If non-zero, Readline will call indirectly through this pointer to - reset the terminal. This function should undo the effects of - `rl_prep_term_function'. By default, this is set to - `rl_deprep_terminal' (*note Terminal Management::). - - - Variable: Keymap rl_executing_keymap - This variable is set to the keymap (*note Keymaps::) in which the - currently executing readline function was found. - - - Variable: Keymap rl_binding_keymap - This variable is set to the keymap (*note Keymaps::) in which the - last key binding occurred. - - - Variable: char * rl_executing_macro - This variable is set to the text of any currently-executing macro. - - - Variable: int rl_readline_state - A variable with bit values that encapsulate the current Readline - state. A bit is set with the `RL_SETSTATE' macro, and unset with - the `RL_UNSETSTATE' macro. Use the `RL_ISSTATE' macro to test - whether a particular state bit is set. Current state bits include: - - `RL_STATE_NONE' - Readline has not yet been called, nor has it begun to - intialize. - - `RL_STATE_INITIALIZING' - Readline is initializing its internal data structures. - - `RL_STATE_INITIALIZED' - Readline has completed its initialization. - - `RL_STATE_TERMPREPPED' - Readline has modified the terminal modes to do its own input - and redisplay. - - `RL_STATE_READCMD' - Readline is reading a command from the keyboard. - - `RL_STATE_METANEXT' - Readline is reading more input after reading the meta-prefix - character. - - `RL_STATE_DISPATCHING' - Readline is dispatching to a command. - - `RL_STATE_MOREINPUT' - Readline is reading more input while executing an editing - command. - - `RL_STATE_ISEARCH' - Readline is performing an incremental history search. - - `RL_STATE_NSEARCH' - Readline is performing a non-incremental history search. - - `RL_STATE_SEARCH' - Readline is searching backward or forward through the history - for a string. - - `RL_STATE_NUMERICARG' - Readline is reading a numeric argument. - - `RL_STATE_MACROINPUT' - Readline is currently getting its input from a - previously-defined keyboard macro. - - `RL_STATE_MACRODEF' - Readline is currently reading characters defining a keyboard - macro. - - `RL_STATE_OVERWRITE' - Readline is in overwrite mode. - - `RL_STATE_COMPLETING' - Readline is performing word completion. - - `RL_STATE_SIGHANDLER' - Readline is currently executing the readline signal handler. - - `RL_STATE_UNDOING' - Readline is performing an undo. - - `RL_STATE_DONE' - Readline has read a key sequence bound to `accept-line' and - is about to return the line to the caller. - - - - Variable: int rl_explicit_arg - Set to a non-zero value if an explicit numeric argument was - specified by the user. Only valid in a bindable command function. - - - Variable: int rl_numeric_arg - Set to the value of any numeric argument explicitly specified by - the user before executing the current Readline function. Only - valid in a bindable command function. - - - Variable: int rl_editing_mode - Set to a value denoting Readline's current editing mode. A value - of 1 means Readline is currently in emacs mode; 0 means that vi - mode is active. - - -File: readline.info, Node: Readline Convenience Functions, Next: Readline Signal Handling, Prev: Readline Variables, Up: Programming with GNU Readline - -Readline Convenience Functions -============================== - -* Menu: - -* Function Naming:: How to give a function you write a name. -* Keymaps:: Making keymaps. -* Binding Keys:: Changing Keymaps. -* Associating Function Names and Bindings:: Translate function names to - key sequences. -* Allowing Undoing:: How to make your functions undoable. -* Redisplay:: Functions to control line display. -* Modifying Text:: Functions to modify `rl_line_buffer'. -* Character Input:: Functions to read keyboard input. -* Terminal Management:: Functions to manage terminal settings. -* Utility Functions:: Generally useful functions and hooks. -* Miscellaneous Functions:: Functions that don't fall into any category. -* Alternate Interface:: Using Readline in a `callback' fashion. -* A Readline Example:: An example Readline function. - - -File: readline.info, Node: Function Naming, Next: Keymaps, Up: Readline Convenience Functions - -Naming a Function ------------------ - - The user can dynamically change the bindings of keys while using -Readline. This is done by representing the function with a descriptive -name. The user is able to type the descriptive name when referring to -the function. Thus, in an init file, one might find - - Meta-Rubout: backward-kill-word - - This binds the keystroke <Meta-Rubout> to the function -_descriptively_ named `backward-kill-word'. You, as the programmer, -should bind the functions you write to descriptive names as well. -Readline provides a function for doing that: - - - Function: int rl_add_defun (const char *name, rl_command_func_t - *function, int key) - Add NAME to the list of named functions. Make FUNCTION be the - function that gets called. If KEY is not -1, then bind it to - FUNCTION using `rl_bind_key()'. - - Using this function alone is sufficient for most applications. It is -the recommended way to add a few functions to the default functions that -Readline has built in. If you need to do something other than adding a -function to Readline, you may need to use the underlying functions -described below. - - -File: readline.info, Node: Keymaps, Next: Binding Keys, Prev: Function Naming, Up: Readline Convenience Functions - -Selecting a Keymap ------------------- - - Key bindings take place on a "keymap". The keymap is the -association between the keys that the user types and the functions that -get run. You can make your own keymaps, copy existing keymaps, and tell -Readline which keymap to use. - - - Function: Keymap rl_make_bare_keymap (void) - Returns a new, empty keymap. The space for the keymap is - allocated with `malloc()'; the caller should free it by calling - `rl_discard_keymap()' when done. - - - Function: Keymap rl_copy_keymap (Keymap map) - Return a new keymap which is a copy of MAP. - - - Function: Keymap rl_make_keymap (void) - Return a new keymap with the printing characters bound to - rl_insert, the lowercase Meta characters bound to run their - equivalents, and the Meta digits bound to produce numeric - arguments. - - - Function: void rl_discard_keymap (Keymap keymap) - Free the storage associated with KEYMAP. - - Readline has several internal keymaps. These functions allow you to -change which keymap is active. - - - Function: Keymap rl_get_keymap (void) - Returns the currently active keymap. - - - Function: void rl_set_keymap (Keymap keymap) - Makes KEYMAP the currently active keymap. - - - Function: Keymap rl_get_keymap_by_name (const char *name) - Return the keymap matching NAME. NAME is one which would be - supplied in a `set keymap' inputrc line (*note Readline Init - File::). - - - Function: char * rl_get_keymap_name (Keymap keymap) - Return the name matching KEYMAP. NAME is one which would be - supplied in a `set keymap' inputrc line (*note Readline Init - File::). - - -File: readline.info, Node: Binding Keys, Next: Associating Function Names and Bindings, Prev: Keymaps, Up: Readline Convenience Functions - -Binding Keys ------------- - - Key sequences are associate with functions through the keymap. -Readline has several internal keymaps: `emacs_standard_keymap', -`emacs_meta_keymap', `emacs_ctlx_keymap', `vi_movement_keymap', and -`vi_insertion_keymap'. `emacs_standard_keymap' is the default, and the -examples in this manual assume that. - - Since `readline()' installs a set of default key bindings the first -time it is called, there is always the danger that a custom binding -installed before the first call to `readline()' will be overridden. An -alternate mechanism is to install custom key bindings in an -initialization function assigned to the `rl_startup_hook' variable -(*note Readline Variables::). - - These functions manage key bindings. - - - Function: int rl_bind_key (int key, rl_command_func_t *function) - Binds KEY to FUNCTION in the currently active keymap. Returns - non-zero in the case of an invalid KEY. - - - Function: int rl_bind_key_in_map (int key, rl_command_func_t - *function, Keymap map) - Bind KEY to FUNCTION in MAP. Returns non-zero in the case of an - invalid KEY. - - - Function: int rl_unbind_key (int key) - Bind KEY to the null function in the currently active keymap. - Returns non-zero in case of error. - - - Function: int rl_unbind_key_in_map (int key, Keymap map) - Bind KEY to the null function in MAP. Returns non-zero in case of - error. - - - Function: int rl_unbind_function_in_map (rl_command_func_t - *function, Keymap map) - Unbind all keys that execute FUNCTION in MAP. - - - Function: int rl_unbind_command_in_map (const char *command, Keymap - map) - Unbind all keys that are bound to COMMAND in MAP. - - - Function: int rl_set_key (const char *keyseq, rl_command_func_t - *function, Keymap map) - Bind the key sequence represented by the string KEYSEQ to the - function FUNCTION. This makes new keymaps as necessary. The - initial keymap in which to do bindings is MAP. - - - Function: int rl_generic_bind (int type, const char *keyseq, char - *data, Keymap map) - Bind the key sequence represented by the string KEYSEQ to the - arbitrary pointer DATA. TYPE says what kind of data is pointed to - by DATA; this can be a function (`ISFUNC'), a macro (`ISMACR'), or - a keymap (`ISKMAP'). This makes new keymaps as necessary. The - initial keymap in which to do bindings is MAP. - - - Function: int rl_parse_and_bind (char *line) - Parse LINE as if it had been read from the `inputrc' file and - perform any key bindings and variable assignments found (*note - Readline Init File::). - - - Function: int rl_read_init_file (const char *filename) - Read keybindings and variable assignments from FILENAME (*note - Readline Init File::). - - -File: readline.info, Node: Associating Function Names and Bindings, Next: Allowing Undoing, Prev: Binding Keys, Up: Readline Convenience Functions - -Associating Function Names and Bindings ---------------------------------------- - - These functions allow you to find out what keys invoke named -functions and the functions invoked by a particular key sequence. You -may also associate a new function name with an arbitrary function. - - - Function: rl_command_func_t * rl_named_function (const char *name) - Return the function with name NAME. - - - Function: rl_command_func_t * rl_function_of_keyseq (const char - *keyseq, Keymap map, int *type) - Return the function invoked by KEYSEQ in keymap MAP. If MAP is - `NULL', the current keymap is used. If TYPE is not `NULL', the - type of the object is returned in the `int' variable it points to - (one of `ISFUNC', `ISKMAP', or `ISMACR'). - - - Function: char ** rl_invoking_keyseqs (rl_command_func_t *function) - Return an array of strings representing the key sequences used to - invoke FUNCTION in the current keymap. - - - Function: char ** rl_invoking_keyseqs_in_map (rl_command_func_t - *function, Keymap map) - Return an array of strings representing the key sequences used to - invoke FUNCTION in the keymap MAP. - - - Function: void rl_function_dumper (int readable) - Print the readline function names and the key sequences currently - bound to them to `rl_outstream'. If READABLE is non-zero, the - list is formatted in such a way that it can be made part of an - `inputrc' file and re-read. - - - Function: void rl_list_funmap_names (void) - Print the names of all bindable Readline functions to - `rl_outstream'. - - - Function: const char ** rl_funmap_names (void) - Return a NULL terminated array of known function names. The array - is sorted. The array itself is allocated, but not the strings - inside. You should `free()' the array when you are done, but not - the pointers. - - - Function: int rl_add_funmap_entry (const char *name, - rl_command_func_t *function) - Add NAME to the list of bindable Readline command names, and make - FUNCTION the function to be called when NAME is invoked. - - -File: readline.info, Node: Allowing Undoing, Next: Redisplay, Prev: Associating Function Names and Bindings, Up: Readline Convenience Functions - -Allowing Undoing ----------------- - - Supporting the undo command is a painless thing, and makes your -functions much more useful. It is certainly easy to try something if -you know you can undo it. - - If your function simply inserts text once, or deletes text once, and -uses `rl_insert_text()' or `rl_delete_text()' to do it, then undoing is -already done for you automatically. - - If you do multiple insertions or multiple deletions, or any -combination of these operations, you should group them together into -one operation. This is done with `rl_begin_undo_group()' and -`rl_end_undo_group()'. - - The types of events that can be undone are: - - enum undo_code { UNDO_DELETE, UNDO_INSERT, UNDO_BEGIN, UNDO_END }; - - Notice that `UNDO_DELETE' means to insert some text, and -`UNDO_INSERT' means to delete some text. That is, the undo code tells -what to undo, not how to undo it. `UNDO_BEGIN' and `UNDO_END' are tags -added by `rl_begin_undo_group()' and `rl_end_undo_group()'. - - - Function: int rl_begin_undo_group (void) - Begins saving undo information in a group construct. The undo - information usually comes from calls to `rl_insert_text()' and - `rl_delete_text()', but could be the result of calls to - `rl_add_undo()'. - - - Function: int rl_end_undo_group (void) - Closes the current undo group started with `rl_begin_undo_group - ()'. There should be one call to `rl_end_undo_group()' for each - call to `rl_begin_undo_group()'. - - - Function: void rl_add_undo (enum undo_code what, int start, int end, - char *text) - Remember how to undo an event (according to WHAT). The affected - text runs from START to END, and encompasses TEXT. - - - Function: void rl_free_undo_list (void) - Free the existing undo list. - - - Function: int rl_do_undo (void) - Undo the first thing on the undo list. Returns `0' if there was - nothing to undo, non-zero if something was undone. - - Finally, if you neither insert nor delete text, but directly modify -the existing text (e.g., change its case), call `rl_modifying()' once, -just before you modify the text. You must supply the indices of the -text range that you are going to modify. - - - Function: int rl_modifying (int start, int end) - Tell Readline to save the text between START and END as a single - undo unit. It is assumed that you will subsequently modify that - text. - - -File: readline.info, Node: Redisplay, Next: Modifying Text, Prev: Allowing Undoing, Up: Readline Convenience Functions - -Redisplay ---------- - - - Function: void rl_redisplay (void) - Change what's displayed on the screen to reflect the current - contents of `rl_line_buffer'. - - - Function: int rl_forced_update_display (void) - Force the line to be updated and redisplayed, whether or not - Readline thinks the screen display is correct. - - - Function: int rl_on_new_line (void) - Tell the update functions that we have moved onto a new (empty) - line, usually after ouputting a newline. - - - Function: int rl_on_new_line_with_prompt (void) - Tell the update functions that we have moved onto a new line, with - RL_PROMPT already displayed. This could be used by applications - that want to output the prompt string themselves, but still need - Readline to know the prompt string length for redisplay. It - should be used after setting RL_ALREADY_PROMPTED. - - - Function: int rl_reset_line_state (void) - Reset the display state to a clean state and redisplay the current - line starting on a new line. - - - Function: int rl_crlf (void) - Move the cursor to the start of the next screen line. - - - Function: int rl_show_char (int c) - Display character C on `rl_outstream'. If Readline has not been - set to display meta characters directly, this will convert meta - characters to a meta-prefixed key sequence. This is intended for - use by applications which wish to do their own redisplay. - - - Function: int rl_message (const char *, ...) - The arguments are a format string as would be supplied to `printf', - possibly containing conversion specifications such as `%d', and - any additional arguments necessary to satisfy the conversion - specifications. The resulting string is displayed in the "echo - area". The echo area is also used to display numeric arguments - and search strings. - - - Function: int rl_clear_message (void) - Clear the message in the echo area. - - - Function: void rl_save_prompt (void) - Save the local Readline prompt display state in preparation for - displaying a new message in the message area with `rl_message()'. - - - Function: void rl_restore_prompt (void) - Restore the local Readline prompt display state saved by the most - recent call to `rl_save_prompt'. - - - Function: int rl_expand_prompt (char *prompt) - Expand any special character sequences in PROMPT and set up the - local Readline prompt redisplay variables. This function is - called by `readline()'. It may also be called to expand the - primary prompt if the `rl_on_new_line_with_prompt()' function or - `rl_already_prompted' variable is used. It returns the number of - visible characters on the last line of the (possibly multi-line) - prompt. - - - Function: int rl_set_prompt (const char *prompt) - Make Readline use PROMPT for subsequent redisplay. This calls - `rl_expand_prompt()' to expand the prompt and sets `rl_prompt' to - the result. - - -File: readline.info, Node: Modifying Text, Next: Character Input, Prev: Redisplay, Up: Readline Convenience Functions - -Modifying Text --------------- - - - Function: int rl_insert_text (const char *text) - Insert TEXT into the line at the current cursor position. Returns - the number of characters inserted. - - - Function: int rl_delete_text (int start, int end) - Delete the text between START and END in the current line. - Returns the number of characters deleted. - - - Function: char * rl_copy_text (int start, int end) - Return a copy of the text between START and END in the current - line. - - - Function: int rl_kill_text (int start, int end) - Copy the text between START and END in the current line to the - kill ring, appending or prepending to the last kill if the last - command was a kill command. The text is deleted. If START is - less than END, the text is appended, otherwise prepended. If the - last command was not a kill, a new kill ring slot is used. - - - Function: int rl_push_macro_input (char *macro) - Cause MACRO to be inserted into the line, as if it had been invoked - by a key bound to a macro. Not especially useful; use - `rl_insert_text()' instead. - - -File: readline.info, Node: Character Input, Next: Terminal Management, Prev: Modifying Text, Up: Readline Convenience Functions - -Character Input ---------------- - - - Function: int rl_read_key (void) - Return the next character available from Readline's current input - stream. This handles input inserted into the input stream via - RL_PENDING_INPUT (*note Readline Variables::) and - `rl_stuff_char()', macros, and characters read from the keyboard. - While waiting for input, this function will call any function - assigned to the `rl_event_hook' variable. - - - Function: int rl_getc (FILE *stream) - Return the next character available from STREAM, which is assumed - to be the keyboard. - - - Function: int rl_stuff_char (int c) - Insert C into the Readline input stream. It will be "read" before - Readline attempts to read characters from the terminal with - `rl_read_key()'. Up to 512 characters may be pushed back. - `rl_stuff_char' returns 1 if the character was successfully - inserted; 0 otherwise. - - - Function: int rl_execute_next (int c) - Make C be the next command to be executed when `rl_read_key()' is - called. This sets RL_PENDING_INPUT. - - - Function: int rl_clear_pending_input (void) - Unset RL_PENDING_INPUT, effectively negating the effect of any - previous call to `rl_execute_next()'. This works only if the - pending input has not already been read with `rl_read_key()'. - - - Function: int rl_set_keyboard_input_timeout (int u) - While waiting for keyboard input in `rl_read_key()', Readline will - wait for U microseconds for input before calling any function - assigned to `rl_event_hook'. The default waiting period is - one-tenth of a second. Returns the old timeout value. - - -File: readline.info, Node: Terminal Management, Next: Utility Functions, Prev: Character Input, Up: Readline Convenience Functions - -Terminal Management -------------------- - - - Function: void rl_prep_terminal (int meta_flag) - Modify the terminal settings for Readline's use, so `readline()' - can read a single character at a time from the keyboard. The - META_FLAG argument should be non-zero if Readline should read - eight-bit input. - - - Function: void rl_deprep_terminal (void) - Undo the effects of `rl_prep_terminal()', leaving the terminal in - the state in which it was before the most recent call to - `rl_prep_terminal()'. - - - Function: void rl_tty_set_default_bindings (Keymap kmap) - Read the operating system's terminal editing characters (as would - be displayed by `stty') to their Readline equivalents. The - bindings are performed in KMAP. - - - Function: int rl_reset_terminal (const char *terminal_name) - Reinitialize Readline's idea of the terminal settings using - TERMINAL_NAME as the terminal type (e.g., `vt100'). If - TERMINAL_NAME is `NULL', the value of the `TERM' environment - variable is used. - - -File: readline.info, Node: Utility Functions, Next: Miscellaneous Functions, Prev: Terminal Management, Up: Readline Convenience Functions - -Utility Functions ------------------ - - - Function: void rl_replace_line (const char *text, int clear_undo) - Replace the contents of `rl_line_buffer' with TEXT. The point and - mark are preserved, if possible. If CLEAR_UNDO is non-zero, the - undo list associated with the current line is cleared. - - - Function: int rl_extend_line_buffer (int len) - Ensure that `rl_line_buffer' has enough space to hold LEN - characters, possibly reallocating it if necessary. - - - Function: int rl_initialize (void) - Initialize or re-initialize Readline's internal state. It's not - strictly necessary to call this; `readline()' calls it before - reading any input. - - - Function: int rl_ding (void) - Ring the terminal bell, obeying the setting of `bell-style'. - - - Function: int rl_alphabetic (int c) - Return 1 if C is an alphabetic character. - - - Function: void rl_display_match_list (char **matches, int len, int - max) - A convenience function for displaying a list of strings in - columnar format on Readline's output stream. `matches' is the list - of strings, in argv format, such as a list of completion matches. - `len' is the number of strings in `matches', and `max' is the - length of the longest string in `matches'. This function uses the - setting of `print-completions-horizontally' to select how the - matches are displayed (*note Readline Init File Syntax::). - - The following are implemented as macros, defined in `chardefs.h'. -Applications should refrain from using them. - - - Function: int _rl_uppercase_p (int c) - Return 1 if C is an uppercase alphabetic character. - - - Function: int _rl_lowercase_p (int c) - Return 1 if C is a lowercase alphabetic character. - - - Function: int _rl_digit_p (int c) - Return 1 if C is a numeric character. - - - Function: int _rl_to_upper (int c) - If C is a lowercase alphabetic character, return the corresponding - uppercase character. - - - Function: int _rl_to_lower (int c) - If C is an uppercase alphabetic character, return the corresponding - lowercase character. - - - Function: int _rl_digit_value (int c) - If C is a number, return the value it represents. - - -File: readline.info, Node: Miscellaneous Functions, Next: Alternate Interface, Prev: Utility Functions, Up: Readline Convenience Functions - -Miscellaneous Functions ------------------------ - - - Function: int rl_macro_bind (const char *keyseq, const char *macro, - Keymap map) - Bind the key sequence KEYSEQ to invoke the macro MACRO. The - binding is performed in MAP. When KEYSEQ is invoked, the MACRO - will be inserted into the line. This function is deprecated; use - `rl_generic_bind()' instead. - - - Function: void rl_macro_dumper (int readable) - Print the key sequences bound to macros and their values, using - the current keymap, to `rl_outstream'. If READABLE is non-zero, - the list is formatted in such a way that it can be made part of an - `inputrc' file and re-read. - - - Function: int rl_variable_bind (const char *variable, const char - *value) - Make the Readline variable VARIABLE have VALUE. This behaves as - if the readline command `set VARIABLE VALUE' had been executed in - an `inputrc' file (*note Readline Init File Syntax::). - - - Function: void rl_variable_dumper (int readable) - Print the readline variable names and their current values to - `rl_outstream'. If READABLE is non-zero, the list is formatted in - such a way that it can be made part of an `inputrc' file and - re-read. - - - Function: int rl_set_paren_blink_timeout (int u) - Set the time interval (in microseconds) that Readline waits when - showing a balancing character when `blink-matching-paren' has been - enabled. - - - Function: char * rl_get_termcap (const char *cap) - Retrieve the string value of the termcap capability CAP. Readline - fetches the termcap entry for the current terminal name and uses - those capabilities to move around the screen line and perform other - terminal-specific operations, like erasing a line. Readline does - not use all of a terminal's capabilities, and this function will - return values for only those capabilities Readline uses. - - -File: readline.info, Node: Alternate Interface, Next: A Readline Example, Prev: Miscellaneous Functions, Up: Readline Convenience Functions - -Alternate Interface -------------------- - - An alternate interface is available to plain `readline()'. Some -applications need to interleave keyboard I/O with file, device, or -window system I/O, typically by using a main loop to `select()' on -various file descriptors. To accomodate this need, readline can also -be invoked as a `callback' function from an event loop. There are -functions available to make this easy. - - - Function: void rl_callback_handler_install (const char *prompt, - rl_vcpfunc_t *lhandler) - Set up the terminal for readline I/O and display the initial - expanded value of PROMPT. Save the value of LHANDLER to use as a - function to call when a complete line of input has been entered. - The function takes the text of the line as an argument. - - - Function: void rl_callback_read_char (void) - Whenever an application determines that keyboard input is - available, it should call `rl_callback_read_char()', which will - read the next character from the current input source. If that - character completes the line, `rl_callback_read_char' will invoke - the LHANDLER function saved by `rl_callback_handler_install' to - process the line. Before calling the LHANDLER function, the - terminal settings are reset to the values they had before calling - `rl_callback_handler_install'. If the LHANDLER function returns, - the terminal settings are modified for Readline's use again. - `EOF' is indicated by calling LHANDLER with a `NULL' line. - - - Function: void rl_callback_handler_remove (void) - Restore the terminal to its initial state and remove the line - handler. This may be called from within a callback as well as - independently. If the LHANDLER installed by - `rl_callback_handler_install' does not exit the program, either - this function or the function referred to by the value of - `rl_deprep_term_function' should be called before the program - exits to reset the terminal settings. - - -File: readline.info, Node: A Readline Example, Prev: Alternate Interface, Up: Readline Convenience Functions - -A Readline Example ------------------- - - Here is a function which changes lowercase characters to their -uppercase equivalents, and uppercase characters to lowercase. If this -function was bound to `M-c', then typing `M-c' would change the case of -the character under point. Typing `M-1 0 M-c' would change the case of -the following 10 characters, leaving the cursor on the last character -changed. - - /* Invert the case of the COUNT following characters. */ - int - invert_case_line (count, key) - int count, key; - { - register int start, end, i; - - start = rl_point; - - if (rl_point >= rl_end) - return (0); - - if (count < 0) - { - direction = -1; - count = -count; - } - else - direction = 1; - - /* Find the end of the range to modify. */ - end = start + (count * direction); - - /* Force it to be within range. */ - if (end > rl_end) - end = rl_end; - else if (end < 0) - end = 0; - - if (start == end) - return (0); - - if (start > end) - { - int temp = start; - start = end; - end = temp; - } - - /* Tell readline that we are modifying the line, - so it will save the undo information. */ - rl_modifying (start, end); - - for (i = start; i != end; i++) - { - if (_rl_uppercase_p (rl_line_buffer[i])) - rl_line_buffer[i] = _rl_to_lower (rl_line_buffer[i]); - else if (_rl_lowercase_p (rl_line_buffer[i])) - rl_line_buffer[i] = _rl_to_upper (rl_line_buffer[i]); - } - /* Move point to on top of the last character changed. */ - rl_point = (direction == 1) ? end - 1 : start; - return (0); - } - - -File: readline.info, Node: Readline Signal Handling, Next: Custom Completers, Prev: Readline Convenience Functions, Up: Programming with GNU Readline - -Readline Signal Handling -======================== - - Signals are asynchronous events sent to a process by the Unix kernel, -sometimes on behalf of another process. They are intended to indicate -exceptional events, like a user pressing the interrupt key on his -terminal, or a network connection being broken. There is a class of -signals that can be sent to the process currently reading input from -the keyboard. Since Readline changes the terminal attributes when it -is called, it needs to perform special processing when such a signal is -received in order to restore the terminal to a sane state, or provide -application writers with functions to do so manually. - - Readline contains an internal signal handler that is installed for a -number of signals (`SIGINT', `SIGQUIT', `SIGTERM', `SIGALRM', -`SIGTSTP', `SIGTTIN', and `SIGTTOU'). When one of these signals is -received, the signal handler will reset the terminal attributes to -those that were in effect before `readline()' was called, reset the -signal handling to what it was before `readline()' was called, and -resend the signal to the calling application. If and when the calling -application's signal handler returns, Readline will reinitialize the -terminal and continue to accept input. When a `SIGINT' is received, -the Readline signal handler performs some additional work, which will -cause any partially-entered line to be aborted (see the description of -`rl_free_line_state()' below). - - There is an additional Readline signal handler, for `SIGWINCH', which -the kernel sends to a process whenever the terminal's size changes (for -example, if a user resizes an `xterm'). The Readline `SIGWINCH' -handler updates Readline's internal screen size information, and then -calls any `SIGWINCH' signal handler the calling application has -installed. Readline calls the application's `SIGWINCH' signal handler -without resetting the terminal to its original state. If the -application's signal handler does more than update its idea of the -terminal size and return (for example, a `longjmp' back to a main -processing loop), it _must_ call `rl_cleanup_after_signal()' (described -below), to restore the terminal state. - - Readline provides two variables that allow application writers to -control whether or not it will catch certain signals and act on them -when they are received. It is important that applications change the -values of these variables only when calling `readline()', not in a -signal handler, so Readline's internal signal state is not corrupted. - - - Variable: int rl_catch_signals - If this variable is non-zero, Readline will install signal - handlers for `SIGINT', `SIGQUIT', `SIGTERM', `SIGALRM', `SIGTSTP', - `SIGTTIN', and `SIGTTOU'. - - The default value of `rl_catch_signals' is 1. - - - Variable: int rl_catch_sigwinch - If this variable is non-zero, Readline will install a signal - handler for `SIGWINCH'. - - The default value of `rl_catch_sigwinch' is 1. - - If an application does not wish to have Readline catch any signals, -or to handle signals other than those Readline catches (`SIGHUP', for -example), Readline provides convenience functions to do the necessary -terminal and internal state cleanup upon receipt of a signal. - - - Function: void rl_cleanup_after_signal (void) - This function will reset the state of the terminal to what it was - before `readline()' was called, and remove the Readline signal - handlers for all signals, depending on the values of - `rl_catch_signals' and `rl_catch_sigwinch'. - - - Function: void rl_free_line_state (void) - This will free any partial state associated with the current input - line (undo information, any partial history entry, any - partially-entered keyboard macro, and any partially-entered - numeric argument). This should be called before - `rl_cleanup_after_signal()'. The Readline signal handler for - `SIGINT' calls this to abort the current input line. - - - Function: void rl_reset_after_signal (void) - This will reinitialize the terminal and reinstall any Readline - signal handlers, depending on the values of `rl_catch_signals' and - `rl_catch_sigwinch'. - - If an application does not wish Readline to catch `SIGWINCH', it may -call `rl_resize_terminal()' or `rl_set_screen_size()' to force Readline -to update its idea of the terminal size when a `SIGWINCH' is received. - - - Function: void rl_resize_terminal (void) - Update Readline's internal screen size by reading values from the - kernel. - - - Function: void rl_set_screen_size (int rows, int cols) - Set Readline's idea of the terminal size to ROWS rows and COLS - columns. - - If an application does not want to install a `SIGWINCH' handler, but -is still interested in the screen dimensions, Readline's idea of the -screen size may be queried. - - - Function: void rl_get_screen_size (int *rows, int *cols) - Return Readline's idea of the terminal's size in the variables - pointed to by the arguments. - - The following functions install and remove Readline's signal -handlers. - - - Function: int rl_set_signals (void) - Install Readline's signal handler for `SIGINT', `SIGQUIT', - `SIGTERM', `SIGALRM', `SIGTSTP', `SIGTTIN', `SIGTTOU', and - `SIGWINCH', depending on the values of `rl_catch_signals' and - `rl_catch_sigwinch'. - - - Function: int rl_clear_signals (void) - Remove all of the Readline signal handlers installed by - `rl_set_signals()'. - - -File: readline.info, Node: Custom Completers, Prev: Readline Signal Handling, Up: Programming with GNU Readline - -Custom Completers -================= - - Typically, a program that reads commands from the user has a way of -disambiguating commands and data. If your program is one of these, then -it can provide completion for commands, data, or both. The following -sections describe how your program and Readline cooperate to provide -this service. - -* Menu: - -* How Completing Works:: The logic used to do completion. -* Completion Functions:: Functions provided by Readline. -* Completion Variables:: Variables which control completion. -* A Short Completion Example:: An example of writing completer subroutines. - - -File: readline.info, Node: How Completing Works, Next: Completion Functions, Up: Custom Completers - -How Completing Works --------------------- - - In order to complete some text, the full list of possible completions -must be available. That is, it is not possible to accurately expand a -partial word without knowing all of the possible words which make sense -in that context. The Readline library provides the user interface to -completion, and two of the most common completion functions: filename -and username. For completing other types of text, you must write your -own completion function. This section describes exactly what such -functions must do, and provides an example. - - There are three major functions used to perform completion: - - 1. The user-interface function `rl_complete()'. This function is - called with the same arguments as other bindable Readline - functions: COUNT and INVOKING_KEY. It isolates the word to be - completed and calls `rl_completion_matches()' to generate a list - of possible completions. It then either lists the possible - completions, inserts the possible completions, or actually - performs the completion, depending on which behavior is desired. - - 2. The internal function `rl_completion_matches()' uses an - application-supplied "generator" function to generate the list of - possible matches, and then returns the array of these matches. - The caller should place the address of its generator function in - `rl_completion_entry_function'. - - 3. The generator function is called repeatedly from - `rl_completion_matches()', returning a string each time. The - arguments to the generator function are TEXT and STATE. TEXT is - the partial word to be completed. STATE is zero the first time - the function is called, allowing the generator to perform any - necessary initialization, and a positive non-zero integer for each - subsequent call. The generator function returns `(char *)NULL' to - inform `rl_completion_matches()' that there are no more - possibilities left. Usually the generator function computes the - list of possible completions when STATE is zero, and returns them - one at a time on subsequent calls. Each string the generator - function returns as a match must be allocated with `malloc()'; - Readline frees the strings when it has finished with them. - - - - Function: int rl_complete (int ignore, int invoking_key) - Complete the word at or before point. You have supplied the - function that does the initial simple matching selection algorithm - (see `rl_completion_matches()'). The default is to do filename - completion. - - - Variable: rl_compentry_func_t * rl_completion_entry_function - This is a pointer to the generator function for - `rl_completion_matches()'. If the value of - `rl_completion_entry_function' is `NULL' then the default filename - generator function, `rl_filename_completion_function()', is used. - - -File: readline.info, Node: Completion Functions, Next: Completion Variables, Prev: How Completing Works, Up: Custom Completers - -Completion Functions --------------------- - - Here is the complete list of callable completion functions present in -Readline. - - - Function: int rl_complete_internal (int what_to_do) - Complete the word at or before point. WHAT_TO_DO says what to do - with the completion. A value of `?' means list the possible - completions. `TAB' means do standard completion. `*' means - insert all of the possible completions. `!' means to display all - of the possible completions, if there is more than one, as well as - performing partial completion. - - - Function: int rl_complete (int ignore, int invoking_key) - Complete the word at or before point. You have supplied the - function that does the initial simple matching selection algorithm - (see `rl_completion_matches()' and `rl_completion_entry_function'). - The default is to do filename completion. This calls - `rl_complete_internal()' with an argument depending on - INVOKING_KEY. - - - Function: int rl_possible_completions (int count, int invoking_key) - List the possible completions. See description of `rl_complete - ()'. This calls `rl_complete_internal()' with an argument of `?'. - - - Function: int rl_insert_completions (int count, int invoking_key) - Insert the list of possible completions into the line, deleting the - partially-completed word. See description of `rl_complete()'. - This calls `rl_complete_internal()' with an argument of `*'. - - - Function: int rl_completion_mode (rl_command_func_t *cfunc) - Returns the apppriate value to pass to `rl_complete_internal()' - depending on whether CFUNC was called twice in succession and the - value of the `show-all-if-ambiguous' variable. - Application-specific completion functions may use this function to - present the same interface as `rl_complete()'. - - - Function: char ** rl_completion_matches (const char *text, - rl_compentry_func_t *entry_func) - Returns an array of strings which is a list of completions for - TEXT. If there are no completions, returns `NULL'. The first - entry in the returned array is the substitution for TEXT. The - remaining entries are the possible completions. The array is - terminated with a `NULL' pointer. - - ENTRY_FUNC is a function of two args, and returns a `char *'. The - first argument is TEXT. The second is a state argument; it is - zero on the first call, and non-zero on subsequent calls. - ENTRY_FUNC returns a `NULL' pointer to the caller when there are - no more matches. - - - Function: char * rl_filename_completion_function (const char *text, - int state) - A generator function for filename completion in the general case. - TEXT is a partial filename. The Bash source is a useful reference - for writing custom completion functions (the Bash completion - functions call this and other Readline functions). - - - Function: char * rl_username_completion_function (const char *text, - int state) - A completion generator for usernames. TEXT contains a partial - username preceded by a random character (usually `~'). As with all - completion generators, STATE is zero on the first call and non-zero - for subsequent calls. - - -File: readline.info, Node: Completion Variables, Next: A Short Completion Example, Prev: Completion Functions, Up: Custom Completers - -Completion Variables --------------------- - - - Variable: rl_compentry_func_t * rl_completion_entry_function - A pointer to the generator function for `rl_completion_matches()'. - `NULL' means to use `rl_filename_completion_function()', the - default filename completer. - - - Variable: rl_completion_func_t * rl_attempted_completion_function - A pointer to an alternative function to create matches. The - function is called with TEXT, START, and END. START and END are - indices in `rl_line_buffer' defining the boundaries of TEXT, which - is a character string. If this function exists and returns - `NULL', or if this variable is set to `NULL', then `rl_complete()' - will call the value of `rl_completion_entry_function' to generate - matches, otherwise the array of strings returned will be used. If - this function sets the `rl_attempted_completion_over' variable to - a non-zero value, Readline will not perform its default completion - even if this function returns no matches. - - - Variable: rl_quote_func_t * rl_filename_quoting_function - A pointer to a function that will quote a filename in an - application-specific fashion. This is called if filename - completion is being attempted and one of the characters in - `rl_filename_quote_characters' appears in a completed filename. - The function is called with TEXT, MATCH_TYPE, and QUOTE_POINTER. - The TEXT is the filename to be quoted. The MATCH_TYPE is either - `SINGLE_MATCH', if there is only one completion match, or - `MULT_MATCH'. Some functions use this to decide whether or not to - insert a closing quote character. The QUOTE_POINTER is a pointer - to any opening quote character the user typed. Some functions - choose to reset this character. - - - Variable: rl_dequote_func_t * rl_filename_dequoting_function - A pointer to a function that will remove application-specific - quoting characters from a filename before completion is attempted, - so those characters do not interfere with matching the text - against names in the filesystem. It is called with TEXT, the text - of the word to be dequoted, and QUOTE_CHAR, which is the quoting - character that delimits the filename (usually `'' or `"'). If - QUOTE_CHAR is zero, the filename was not in an embedded string. - - - Variable: rl_linebuf_func_t * rl_char_is_quoted_p - A pointer to a function to call that determines whether or not a - specific character in the line buffer is quoted, according to - whatever quoting mechanism the program calling Readline uses. The - function is called with two arguments: TEXT, the text of the line, - and INDEX, the index of the character in the line. It is used to - decide whether a character found in - `rl_completer_word_break_characters' should be used to break words - for the completer. - - - Variable: rl_compignore_func_t * rl_ignore_some_completions_function - This function, if defined, is called by the completer when real - filename completion is done, after all the matching names have - been generated. It is passed a `NULL' terminated array of matches. - The first element (`matches[0]') is the maximal substring common - to all matches. This function can re-arrange the list of matches - as required, but each element deleted from the array must be freed. - - - Variable: rl_icppfunc_t * rl_directory_completion_hook - This function, if defined, is allowed to modify the directory - portion of filenames Readline completes. It is called with the - address of a string (the current directory name) as an argument, - and may modify that string. If the string is replaced with a new - string, the old value should be freed. Any modified directory - name should have a trailing slash. The modified value will be - displayed as part of the completion, replacing the directory - portion of the pathname the user typed. It returns an integer - that should be non-zero if the function modifies its directory - argument. It could be used to expand symbolic links or shell - variables in pathnames. - - - Variable: rl_compdisp_func_t * rl_completion_display_matches_hook - If non-zero, then this is the address of a function to call when - completing a word would normally display the list of possible - matches. This function is called in lieu of Readline displaying - the list. It takes three arguments: (`char **'MATCHES, `int' - NUM_MATCHES, `int' MAX_LENGTH) where MATCHES is the array of - matching strings, NUM_MATCHES is the number of strings in that - array, and MAX_LENGTH is the length of the longest string in that - array. Readline provides a convenience function, - `rl_display_match_list', that takes care of doing the display to - Readline's output stream. That function may be called from this - hook. - - - Variable: const char * rl_basic_word_break_characters - The basic list of characters that signal a break between words for - the completer routine. The default value of this variable is the - characters which break words for completion in Bash: `" - \t\n\"\\'`@$><=;|&{("'. - - - Variable: const char * rl_basic_quote_characters - A list of quote characters which can cause a word break. - - - Variable: const char * rl_completer_word_break_characters - The list of characters that signal a break between words for - `rl_complete_internal()'. The default list is the value of - `rl_basic_word_break_characters'. - - - Variable: const char * rl_completer_quote_characters - A list of characters which can be used to quote a substring of the - line. Completion occurs on the entire substring, and within the - substring `rl_completer_word_break_characters' are treated as any - other character, unless they also appear within this list. - - - Variable: const char * rl_filename_quote_characters - A list of characters that cause a filename to be quoted by the - completer when they appear in a completed filename. The default - is the null string. - - - Variable: const char * rl_special_prefixes - The list of characters that are word break characters, but should - be left in TEXT when it is passed to the completion function. - Programs can use this to help determine what kind of completing to - do. For instance, Bash sets this variable to "$@" so that it can - complete shell variables and hostnames. - - - Variable: int rl_completion_query_items - Up to this many items will be displayed in response to a - possible-completions call. After that, we ask the user if she is - sure she wants to see them all. The default value is 100. - - - Variable: int rl_completion_append_character - When a single completion alternative matches at the end of the - command line, this character is appended to the inserted - completion text. The default is a space character (` '). Setting - this to the null character (`\0') prevents anything being appended - automatically. This can be changed in custom completion functions - to provide the "most sensible word separator character" according - to an application-specific command line syntax specification. - - - Variable: int rl_completion_suppress_append - If non-zero, RL_COMPLETION_APPEND_CHARACTER is not appended to - matches at the end of the command line, as described above. It is - set to 0 before any application-specific completion function is - called. - - - Variable: int rl_completion_mark_symlink_dirs - If non-zero, a slash will be appended to completed filenames that - are symbolic links to directory names, subject to the value of the - user-settable MARK-DIRECTORIES variable. This variable exists so - that application completion functions can override the user's - global preference (set via the MARK-SYMLINKED-DIRECTORIES Readline - variable) if appropriate. This variable is set to the user's - preference before any application completion function is called, - so unless that function modifies the value, the user's preferences - are honored. - - - Variable: int rl_ignore_completion_duplicates - If non-zero, then duplicates in the matches are removed. The - default is 1. - - - Variable: int rl_filename_completion_desired - Non-zero means that the results of the matches are to be treated as - filenames. This is _always_ zero on entry, and can only be changed - within a completion entry generator function. If it is set to a - non-zero value, directory names have a slash appended and Readline - attempts to quote completed filenames if they contain any - characters in `rl_filename_quote_characters' and - `rl_filename_quoting_desired' is set to a non-zero value. - - - Variable: int rl_filename_quoting_desired - Non-zero means that the results of the matches are to be quoted - using double quotes (or an application-specific quoting mechanism) - if the completed filename contains any characters in - `rl_filename_quote_chars'. This is _always_ non-zero on entry, - and can only be changed within a completion entry generator - function. The quoting is effected via a call to the function - pointed to by `rl_filename_quoting_function'. - - - Variable: int rl_attempted_completion_over - If an application-specific completion function assigned to - `rl_attempted_completion_function' sets this variable to a non-zero - value, Readline will not perform its default filename completion - even if the application's completion function returns no matches. - It should be set only by an application's completion function. - - - Variable: int rl_completion_type - Set to a character describing the type of completion Readline is - currently attempting; see the description of - `rl_complete_internal()' (*note Completion Functions::) for the - list of characters. - - - Variable: int rl_inhibit_completion - If this variable is non-zero, completion is inhibited. The - completion character will be inserted as any other bound to - `self-insert'. - - -File: readline.info, Node: A Short Completion Example, Prev: Completion Variables, Up: Custom Completers - -A Short Completion Example --------------------------- - - Here is a small application demonstrating the use of the GNU Readline -library. It is called `fileman', and the source code resides in -`examples/fileman.c'. This sample application provides completion of -command names, line editing features, and access to the history list. - - /* fileman.c -- A tiny application which demonstrates how to use the - GNU Readline library. This application interactively allows users - to manipulate files and their modes. */ - - #include <stdio.h> - #include <sys/types.h> - #include <sys/file.h> - #include <sys/stat.h> - #include <sys/errno.h> - - #include <readline/readline.h> - #include <readline/history.h> - - extern char *xmalloc (); - - /* The names of functions that actually do the manipulation. */ - int com_list __P((char *)); - int com_view __P((char *)); - int com_rename __P((char *)); - int com_stat __P((char *)); - int com_pwd __P((char *)); - int com_delete __P((char *)); - int com_help __P((char *)); - int com_cd __P((char *)); - int com_quit __P((char *)); - - /* A structure which contains information on the commands this program - can understand. */ - - typedef struct { - char *name; /* User printable name of the function. */ - rl_icpfunc_t *func; /* Function to call to do the job. */ - char *doc; /* Documentation for this function. */ - } COMMAND; - - COMMAND commands[] = { - { "cd", com_cd, "Change to directory DIR" }, - { "delete", com_delete, "Delete FILE" }, - { "help", com_help, "Display this text" }, - { "?", com_help, "Synonym for `help'" }, - { "list", com_list, "List files in DIR" }, - { "ls", com_list, "Synonym for `list'" }, - { "pwd", com_pwd, "Print the current working directory" }, - { "quit", com_quit, "Quit using Fileman" }, - { "rename", com_rename, "Rename FILE to NEWNAME" }, - { "stat", com_stat, "Print out statistics on FILE" }, - { "view", com_view, "View the contents of FILE" }, - { (char *)NULL, (rl_icpfunc_t *)NULL, (char *)NULL } - }; - - /* Forward declarations. */ - char *stripwhite (); - COMMAND *find_command (); - - /* The name of this program, as taken from argv[0]. */ - char *progname; - - /* When non-zero, this means the user is done using this program. */ - int done; - - char * - dupstr (s) - int s; - { - char *r; - - r = xmalloc (strlen (s) + 1); - strcpy (r, s); - return (r); - } - - main (argc, argv) - int argc; - char **argv; - { - char *line, *s; - - progname = argv[0]; - - initialize_readline (); /* Bind our completer. */ - - /* Loop reading and executing lines until the user quits. */ - for ( ; done == 0; ) - { - line = readline ("FileMan: "); - - if (!line) - break; - - /* Remove leading and trailing whitespace from the line. - Then, if there is anything left, add it to the history list - and execute it. */ - s = stripwhite (line); - - if (*s) - { - add_history (s); - execute_line (s); - } - - free (line); - } - exit (0); - } - - /* Execute a command line. */ - int - execute_line (line) - char *line; - { - register int i; - COMMAND *command; - char *word; - - /* Isolate the command word. */ - i = 0; - while (line[i] && whitespace (line[i])) - i++; - word = line + i; - - while (line[i] && !whitespace (line[i])) - i++; - - if (line[i]) - line[i++] = '\0'; - - command = find_command (word); - - if (!command) - { - fprintf (stderr, "%s: No such command for FileMan.\n", word); - return (-1); - } - - /* Get argument to command, if any. */ - while (whitespace (line[i])) - i++; - - word = line + i; - - /* Call the function. */ - return ((*(command->func)) (word)); - } - - /* Look up NAME as the name of a command, and return a pointer to that - command. Return a NULL pointer if NAME isn't a command name. */ - COMMAND * - find_command (name) - char *name; - { - register int i; - - for (i = 0; commands[i].name; i++) - if (strcmp (name, commands[i].name) == 0) - return (&commands[i]); - - return ((COMMAND *)NULL); - } - - /* Strip whitespace from the start and end of STRING. Return a pointer - into STRING. */ - char * - stripwhite (string) - char *string; - { - register char *s, *t; - - for (s = string; whitespace (*s); s++) - ; - - if (*s == 0) - return (s); - - t = s + strlen (s) - 1; - while (t > s && whitespace (*t)) - t--; - *++t = '\0'; - - return s; - } - - /* **************************************************************** */ - /* */ - /* Interface to Readline Completion */ - /* */ - /* **************************************************************** */ - - char *command_generator __P((const char *, int)); - char **fileman_completion __P((const char *, int, int)); - - /* Tell the GNU Readline library how to complete. We want to try to - complete on command names if this is the first word in the line, or - on filenames if not. */ - initialize_readline () - { - /* Allow conditional parsing of the ~/.inputrc file. */ - rl_readline_name = "FileMan"; - - /* Tell the completer that we want a crack first. */ - rl_attempted_completion_function = fileman_completion; - } - - /* Attempt to complete on the contents of TEXT. START and END - bound the region of rl_line_buffer that contains the word to - complete. TEXT is the word to complete. We can use the entire - contents of rl_line_buffer in case we want to do some simple - parsing. Returnthe array of matches, or NULL if there aren't any. */ - char ** - fileman_completion (text, start, end) - const char *text; - int start, end; - { - char **matches; - - matches = (char **)NULL; - - /* If this word is at the start of the line, then it is a command - to complete. Otherwise it is the name of a file in the current - directory. */ - if (start == 0) - matches = rl_completion_matches (text, command_generator); - - return (matches); - } - - /* Generator function for command completion. STATE lets us - know whether to start from scratch; without any state - (i.e. STATE == 0), then we start at the top of the list. */ - char * - command_generator (text, state) - const char *text; - int state; - { - static int list_index, len; - char *name; - - /* If this is a new word to complete, initialize now. This - includes saving the length of TEXT for efficiency, and - initializing the index variable to 0. */ - if (!state) - { - list_index = 0; - len = strlen (text); - } - - /* Return the next name which partially matches from the - command list. */ - while (name = commands[list_index].name) - { - list_index++; - - if (strncmp (name, text, len) == 0) - return (dupstr(name)); - } - - /* If no names matched, then return NULL. */ - return ((char *)NULL); - } - - /* **************************************************************** */ - /* */ - /* FileMan Commands */ - /* */ - /* **************************************************************** */ - - /* String to pass to system (). This is for the LIST, VIEW and RENAME - commands. */ - static char syscom[1024]; - - /* List the file(s) named in arg. */ - com_list (arg) - char *arg; - { - if (!arg) - arg = ""; - - sprintf (syscom, "ls -FClg %s", arg); - return (system (syscom)); - } - - com_view (arg) - char *arg; - { - if (!valid_argument ("view", arg)) - return 1; - - sprintf (syscom, "more %s", arg); - return (system (syscom)); - } - - com_rename (arg) - char *arg; - { - too_dangerous ("rename"); - return (1); - } - - com_stat (arg) - char *arg; - { - struct stat finfo; - - if (!valid_argument ("stat", arg)) - return (1); - - if (stat (arg, &finfo) == -1) - { - perror (arg); - return (1); - } - - printf ("Statistics for `%s':\n", arg); - - printf ("%s has %d link%s, and is %d byte%s in length.\n", arg, - finfo.st_nlink, - (finfo.st_nlink == 1) ? "" : "s", - finfo.st_size, - (finfo.st_size == 1) ? "" : "s"); - printf ("Inode Last Change at: %s", ctime (&finfo.st_ctime)); - printf (" Last access at: %s", ctime (&finfo.st_atime)); - printf (" Last modified at: %s", ctime (&finfo.st_mtime)); - return (0); - } - - com_delete (arg) - char *arg; - { - too_dangerous ("delete"); - return (1); - } - - /* Print out help for ARG, or for all of the commands if ARG is - not present. */ - com_help (arg) - char *arg; - { - register int i; - int printed = 0; - - for (i = 0; commands[i].name; i++) - { - if (!*arg || (strcmp (arg, commands[i].name) == 0)) - { - printf ("%s\t\t%s.\n", commands[i].name, commands[i].doc); - printed++; - } - } - - if (!printed) - { - printf ("No commands match `%s'. Possibilties are:\n", arg); - - for (i = 0; commands[i].name; i++) - { - /* Print in six columns. */ - if (printed == 6) - { - printed = 0; - printf ("\n"); - } - - printf ("%s\t", commands[i].name); - printed++; - } - - if (printed) - printf ("\n"); - } - return (0); - } - - /* Change to the directory ARG. */ - com_cd (arg) - char *arg; - { - if (chdir (arg) == -1) - { - perror (arg); - return 1; - } - - com_pwd (""); - return (0); - } - - /* Print out the current working directory. */ - com_pwd (ignore) - char *ignore; - { - char dir[1024], *s; - - s = getcwd (dir, sizeof(dir) - 1); - if (s == 0) - { - printf ("Error getting pwd: %s\n", dir); - return 1; - } - - printf ("Current directory is %s\n", dir); - return 0; - } - - /* The user wishes to quit using this program. Just set DONE - non-zero. */ - com_quit (arg) - char *arg; - { - done = 1; - return (0); - } - - /* Function which tells you that you can't do this. */ - too_dangerous (caller) - char *caller; - { - fprintf (stderr, - "%s: Too dangerous for me to distribute.\n" - caller); - fprintf (stderr, "Write it yourself.\n"); - } - - /* Return non-zero if ARG is a valid argument for CALLER, - else print an error message and return zero. */ - int - valid_argument (caller, arg) - char *caller, *arg; - { - if (!arg || !*arg) - { - fprintf (stderr, "%s: Argument required.\n", caller); - return (0); - } - - return (1); - } - - -File: readline.info, Node: Concept Index, Next: Function and Variable Index, Prev: Programming with GNU Readline, Up: Top - -Concept Index -************* - -* Menu: - -* command editing: Readline Bare Essentials. -* editing command lines: Readline Bare Essentials. -* initialization file, readline: Readline Init File. -* interaction, readline: Readline Interaction. -* kill ring: Readline Killing Commands. -* killing text: Readline Killing Commands. -* notation, readline: Readline Bare Essentials. -* readline, function: Basic Behavior. -* variables, readline: Readline Init File Syntax. -* yanking text: Readline Killing Commands. - - -File: readline.info, Node: Function and Variable Index, Prev: Concept Index, Up: Top - -Function and Variable Index -*************************** - -* Menu: - -* _rl_digit_p: Utility Functions. -* _rl_digit_value: Utility Functions. -* _rl_lowercase_p: Utility Functions. -* _rl_to_lower: Utility Functions. -* _rl_to_upper: Utility Functions. -* _rl_uppercase_p: Utility Functions. -* abort (C-g): Miscellaneous Commands. -* accept-line (Newline or Return): Commands For History. -* backward-char (C-b): Commands For Moving. -* backward-delete-char (Rubout): Commands For Text. -* backward-kill-line (C-x Rubout): Commands For Killing. -* backward-kill-word (M-<DEL>): Commands For Killing. -* backward-word (M-b): Commands For Moving. -* beginning-of-history (M-<): Commands For History. -* beginning-of-line (C-a): Commands For Moving. -* bell-style: Readline Init File Syntax. -* call-last-kbd-macro (C-x e): Keyboard Macros. -* capitalize-word (M-c): Commands For Text. -* character-search (C-]): Miscellaneous Commands. -* character-search-backward (M-C-]): Miscellaneous Commands. -* clear-screen (C-l): Commands For Moving. -* comment-begin: Readline Init File Syntax. -* complete (<TAB>): Commands For Completion. -* completion-query-items: Readline Init File Syntax. -* convert-meta: Readline Init File Syntax. -* copy-backward-word (): Commands For Killing. -* copy-forward-word (): Commands For Killing. -* copy-region-as-kill (): Commands For Killing. -* delete-char (C-d): Commands For Text. -* delete-char-or-list (): Commands For Completion. -* delete-horizontal-space (): Commands For Killing. -* digit-argument (M-0, M-1, ... M--): Numeric Arguments. -* disable-completion: Readline Init File Syntax. -* do-uppercase-version (M-a, M-b, M-X, ...): Miscellaneous Commands. -* downcase-word (M-l): Commands For Text. -* dump-functions (): Miscellaneous Commands. -* dump-macros (): Miscellaneous Commands. -* dump-variables (): Miscellaneous Commands. -* editing-mode: Readline Init File Syntax. -* enable-keypad: Readline Init File Syntax. -* end-kbd-macro (C-x )): Keyboard Macros. -* end-of-history (M->): Commands For History. -* end-of-line (C-e): Commands For Moving. -* exchange-point-and-mark (C-x C-x): Miscellaneous Commands. -* expand-tilde: Readline Init File Syntax. -* forward-backward-delete-char (): Commands For Text. -* forward-char (C-f): Commands For Moving. -* forward-search-history (C-s): Commands For History. -* forward-word (M-f): Commands For Moving. -* history-preserve-point: Readline Init File Syntax. -* history-search-backward (): Commands For History. -* history-search-forward (): Commands For History. -* horizontal-scroll-mode: Readline Init File Syntax. -* input-meta: Readline Init File Syntax. -* insert-comment (M-#): Miscellaneous Commands. -* insert-completions (M-*): Commands For Completion. -* isearch-terminators: Readline Init File Syntax. -* keymap: Readline Init File Syntax. -* kill-line (C-k): Commands For Killing. -* kill-region (): Commands For Killing. -* kill-whole-line (): Commands For Killing. -* kill-word (M-d): Commands For Killing. -* mark-modified-lines: Readline Init File Syntax. -* mark-symlinked-directories: Readline Init File Syntax. -* match-hidden-files: Readline Init File Syntax. -* menu-complete (): Commands For Completion. -* meta-flag: Readline Init File Syntax. -* next-history (C-n): Commands For History. -* non-incremental-forward-search-history (M-n): Commands For History. -* non-incremental-reverse-search-history (M-p): Commands For History. -* output-meta: Readline Init File Syntax. -* overwrite-mode (): Commands For Text. -* page-completions: Readline Init File Syntax. -* possible-completions (M-?): Commands For Completion. -* prefix-meta (<ESC>): Miscellaneous Commands. -* previous-history (C-p): Commands For History. -* quoted-insert (C-q or C-v): Commands For Text. -* re-read-init-file (C-x C-r): Miscellaneous Commands. -* readline: Basic Behavior. -* redraw-current-line (): Commands For Moving. -* reverse-search-history (C-r): Commands For History. -* revert-line (M-r): Miscellaneous Commands. -* rl_add_defun: Function Naming. -* rl_add_funmap_entry: Associating Function Names and Bindings. -* rl_add_undo: Allowing Undoing. -* rl_alphabetic: Utility Functions. -* rl_already_prompted: Readline Variables. -* rl_attempted_completion_function: Completion Variables. -* rl_attempted_completion_over: Completion Variables. -* rl_basic_quote_characters: Completion Variables. -* rl_basic_word_break_characters: Completion Variables. -* rl_begin_undo_group: Allowing Undoing. -* rl_bind_key: Binding Keys. -* rl_bind_key_in_map: Binding Keys. -* rl_binding_keymap: Readline Variables. -* rl_callback_handler_install: Alternate Interface. -* rl_callback_handler_remove: Alternate Interface. -* rl_callback_read_char: Alternate Interface. -* rl_catch_signals: Readline Signal Handling. -* rl_catch_sigwinch: Readline Signal Handling. -* rl_char_is_quoted_p: Completion Variables. -* rl_cleanup_after_signal: Readline Signal Handling. -* rl_clear_message: Redisplay. -* rl_clear_pending_input: Character Input. -* rl_clear_signals: Readline Signal Handling. -* rl_complete <1>: How Completing Works. -* rl_complete: Completion Functions. -* rl_complete_internal: Completion Functions. -* rl_completer_quote_characters: Completion Variables. -* rl_completer_word_break_characters: Completion Variables. -* rl_completion_append_character: Completion Variables. -* rl_completion_display_matches_hook: Completion Variables. -* rl_completion_entry_function <1>: Completion Variables. -* rl_completion_entry_function: How Completing Works. -* rl_completion_mark_symlink_dirs: Completion Variables. -* rl_completion_matches: Completion Functions. -* rl_completion_mode: Completion Functions. -* rl_completion_query_items: Completion Variables. -* rl_completion_suppress_append: Completion Variables. -* rl_completion_type: Completion Variables. -* rl_copy_keymap: Keymaps. -* rl_copy_text: Modifying Text. -* rl_crlf: Redisplay. -* rl_delete_text: Modifying Text. -* rl_deprep_term_function: Readline Variables. -* rl_deprep_terminal: Terminal Management. -* rl_ding: Utility Functions. -* rl_directory_completion_hook: Completion Variables. -* rl_discard_keymap: Keymaps. -* rl_dispatching: Readline Variables. -* rl_display_match_list: Utility Functions. -* rl_do_undo: Allowing Undoing. -* rl_done: Readline Variables. -* rl_editing_mode: Readline Variables. -* rl_end: Readline Variables. -* rl_end_undo_group: Allowing Undoing. -* rl_erase_empty_line: Readline Variables. -* rl_event_hook: Readline Variables. -* rl_execute_next: Character Input. -* rl_executing_keymap: Readline Variables. -* rl_executing_macro: Readline Variables. -* rl_expand_prompt: Redisplay. -* rl_explicit_arg: Readline Variables. -* rl_extend_line_buffer: Utility Functions. -* rl_filename_completion_desired: Completion Variables. -* rl_filename_completion_function: Completion Functions. -* rl_filename_dequoting_function: Completion Variables. -* rl_filename_quote_characters: Completion Variables. -* rl_filename_quoting_desired: Completion Variables. -* rl_filename_quoting_function: Completion Variables. -* rl_forced_update_display: Redisplay. -* rl_free_line_state: Readline Signal Handling. -* rl_free_undo_list: Allowing Undoing. -* rl_function_dumper: Associating Function Names and Bindings. -* rl_function_of_keyseq: Associating Function Names and Bindings. -* rl_funmap_names: Associating Function Names and Bindings. -* rl_generic_bind: Binding Keys. -* rl_get_keymap: Keymaps. -* rl_get_keymap_by_name: Keymaps. -* rl_get_keymap_name: Keymaps. -* rl_get_screen_size: Readline Signal Handling. -* rl_get_termcap: Miscellaneous Functions. -* rl_getc: Character Input. -* rl_getc_function: Readline Variables. -* rl_gnu_readline_p: Readline Variables. -* rl_ignore_completion_duplicates: Completion Variables. -* rl_ignore_some_completions_function: Completion Variables. -* rl_inhibit_completion: Completion Variables. -* rl_initialize: Utility Functions. -* rl_insert_completions: Completion Functions. -* rl_insert_text: Modifying Text. -* rl_instream: Readline Variables. -* rl_invoking_keyseqs: Associating Function Names and Bindings. -* rl_invoking_keyseqs_in_map: Associating Function Names and Bindings. -* rl_kill_text: Modifying Text. -* rl_last_func: Readline Variables. -* rl_library_version: Readline Variables. -* rl_line_buffer: Readline Variables. -* rl_list_funmap_names: Associating Function Names and Bindings. -* rl_macro_bind: Miscellaneous Functions. -* rl_macro_dumper: Miscellaneous Functions. -* rl_make_bare_keymap: Keymaps. -* rl_make_keymap: Keymaps. -* rl_mark: Readline Variables. -* rl_message: Redisplay. -* rl_modifying: Allowing Undoing. -* rl_named_function: Associating Function Names and Bindings. -* rl_num_chars_to_read: Readline Variables. -* rl_numeric_arg: Readline Variables. -* rl_on_new_line: Redisplay. -* rl_on_new_line_with_prompt: Redisplay. -* rl_outstream: Readline Variables. -* rl_parse_and_bind: Binding Keys. -* rl_pending_input: Readline Variables. -* rl_point: Readline Variables. -* rl_possible_completions: Completion Functions. -* rl_pre_input_hook: Readline Variables. -* rl_prep_term_function: Readline Variables. -* rl_prep_terminal: Terminal Management. -* rl_prompt: Readline Variables. -* rl_push_macro_input: Modifying Text. -* rl_read_init_file: Binding Keys. -* rl_read_key: Character Input. -* rl_readline_name: Readline Variables. -* rl_readline_state: Readline Variables. -* rl_readline_version: Readline Variables. -* rl_redisplay: Redisplay. -* rl_redisplay_function: Readline Variables. -* rl_replace_line: Utility Functions. -* rl_reset_after_signal: Readline Signal Handling. -* rl_reset_line_state: Redisplay. -* rl_reset_terminal: Terminal Management. -* rl_resize_terminal: Readline Signal Handling. -* rl_restore_prompt: Redisplay. -* rl_save_prompt: Redisplay. -* rl_set_key: Binding Keys. -* rl_set_keyboard_input_timeout: Character Input. -* rl_set_keymap: Keymaps. -* rl_set_paren_blink_timeout: Miscellaneous Functions. -* rl_set_prompt: Redisplay. -* rl_set_screen_size: Readline Signal Handling. -* rl_set_signals: Readline Signal Handling. -* rl_show_char: Redisplay. -* rl_special_prefixes: Completion Variables. -* rl_startup_hook: Readline Variables. -* rl_stuff_char: Character Input. -* rl_terminal_name: Readline Variables. -* rl_tty_set_default_bindings: Terminal Management. -* rl_unbind_command_in_map: Binding Keys. -* rl_unbind_function_in_map: Binding Keys. -* rl_unbind_key: Binding Keys. -* rl_unbind_key_in_map: Binding Keys. -* rl_username_completion_function: Completion Functions. -* rl_variable_bind: Miscellaneous Functions. -* rl_variable_dumper: Miscellaneous Functions. -* self-insert (a, b, A, 1, !, ...): Commands For Text. -* set-mark (C-@): Miscellaneous Commands. -* show-all-if-ambiguous: Readline Init File Syntax. -* start-kbd-macro (C-x (): Keyboard Macros. -* transpose-chars (C-t): Commands For Text. -* transpose-words (M-t): Commands For Text. -* undo (C-_ or C-x C-u): Miscellaneous Commands. -* universal-argument (): Numeric Arguments. -* unix-line-discard (C-u): Commands For Killing. -* unix-word-rubout (C-w): Commands For Killing. -* upcase-word (M-u): Commands For Text. -* visible-stats: Readline Init File Syntax. -* yank (C-y): Commands For Killing. -* yank-last-arg (M-. or M-_): Commands For History. -* yank-nth-arg (M-C-y): Commands For History. -* yank-pop (M-y): Commands For Killing. - - - -Tag Table: -Node: Top1164 -Node: Command Line Editing1763 -Node: Introduction and Notation2414 -Node: Readline Interaction4032 -Node: Readline Bare Essentials5219 -Node: Readline Movement Commands7000 -Node: Readline Killing Commands7957 -Node: Readline Arguments9866 -Node: Searching10902 -Node: Readline Init File13045 -Node: Readline Init File Syntax14106 -Node: Conditional Init Constructs24989 -Node: Sample Init File27514 -Node: Bindable Readline Commands30698 -Node: Commands For Moving31748 -Node: Commands For History32597 -Node: Commands For Text35455 -Node: Commands For Killing38169 -Node: Numeric Arguments40120 -Node: Commands For Completion41248 -Node: Keyboard Macros42780 -Node: Miscellaneous Commands43339 -Node: Readline vi Mode46688 -Node: Programming with GNU Readline48506 -Node: Basic Behavior49474 -Node: Custom Functions52904 -Node: Readline Typedefs54382 -Node: Function Writing56011 -Node: Readline Variables57219 -Node: Readline Convenience Functions66642 -Node: Function Naming67624 -Node: Keymaps68876 -Node: Binding Keys70632 -Node: Associating Function Names and Bindings73558 -Node: Allowing Undoing75803 -Node: Redisplay78338 -Node: Modifying Text81409 -Node: Character Input82638 -Node: Terminal Management84418 -Node: Utility Functions85593 -Node: Miscellaneous Functions87932 -Node: Alternate Interface89996 -Node: A Readline Example92141 -Node: Readline Signal Handling94078 -Node: Custom Completers99681 -Node: How Completing Works100396 -Node: Completion Functions103394 -Node: Completion Variables106778 -Node: A Short Completion Example117049 -Node: Concept Index129602 -Node: Function and Variable Index130424 - -End Tag Table |