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Diffstat (limited to 'libtecla-1.4.1/libtecla.h')
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diff --git a/libtecla-1.4.1/libtecla.h b/libtecla-1.4.1/libtecla.h new file mode 100644 index 0000000..f124dd0 --- /dev/null +++ b/libtecla-1.4.1/libtecla.h @@ -0,0 +1,1194 @@ +#ifndef libtecla_h +#define libtecla_h + +/* + * Copyright (c) 2000, 2001 by Martin C. Shepherd. + * + * All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, and/or sell copies of the Software, and to permit persons + * to whom the Software is furnished to do so, provided that the above + * copyright notice(s) and this permission notice appear in all copies of + * the Software and that both the above copyright notice(s) and this + * permission notice appear in supporting documentation. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT + * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR + * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL + * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING + * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, + * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION + * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Except as contained in this notice, the name of a copyright holder + * shall not be used in advertising or otherwise to promote the sale, use + * or other dealings in this Software without prior written authorization + * of the copyright holder. + */ + +#ifdef __cplusplus +extern "C" { +#endif + +#include <stdio.h> /* FILE * */ +#include <stdlib.h> /* size_t */ +#include <time.h> /* time_t */ + +/* + * The following are the three components of the libtecla version number. + * Note that it is better to use the libtecla_version() function than these + * macros since the macros only tell you which version of the library your + * code was compiled against, whereas the libtecla_version() function + * tells you which version of the shared tecla library your program is + * actually linked to. + */ +#define TECLA_MAJOR_VER 1 +#define TECLA_MINOR_VER 4 +#define TECLA_MICRO_VER 1 + +/*....................................................................... + * Query the version number of the tecla library. + * + * Input: + * major int * The major version number of the library + * will be assigned to *major. This number is + * only incremented when a change to the library is + * made that breaks binary (shared library) and/or + * compilation backwards compatibility. + * minor int * The minor version number of the library + * will be assigned to *minor. This number is + * incremented whenever new functions are added to + * the public API. + * micro int * The micro version number of the library will be + * assigned to *micro. This number is incremented + * whenever internal changes are made that don't + * change the public API, such as bug fixes and + * performance enhancements. + */ +void libtecla_version(int *major, int *minor, int *micro); + +/*----------------------------------------------------------------------- + * The getline module provides interactive command-line input, recall + * and editing by users at terminals. See the gl_getline(3) man page for + * more details. + *-----------------------------------------------------------------------*/ + +/* + * Provide an opaque handle for the resource object that is defined in + * getline.h. + */ +typedef struct GetLine GetLine; + +/* + * The following two functions are used to create and delete the + * resource objects that are used by the gl_getline() function. + */ +GetLine *new_GetLine(size_t linelen, size_t histlen); +GetLine *del_GetLine(GetLine *gl); + +/* + * Read a line into an internal buffer of gl. + */ +char *gl_get_line(GetLine *gl, const char *prompt, const char *start_line, + int start_pos); + +/* + * Configure the application specific and/or user-specific behavior of + * gl_get_line(). + */ +int gl_configure_getline(GetLine *gl, const char *app_string, + const char *app_file, const char *user_file); + +/*----------------------------------------------------------------------- + * The file-expansion module provides facilities for expanding ~user/ and + * $envvar expressions, and for expanding glob-style wildcards. + * See the ef_expand_file(3) man page for more details. + *-----------------------------------------------------------------------*/ + +/* + * ExpandFile objects contain the resources needed to expand pathnames. + */ +typedef struct ExpandFile ExpandFile; + +/* + * The following functions are used to create and delete the resource + * objects that are used by the ef_expand_file() function. + */ +ExpandFile *new_ExpandFile(void); +ExpandFile *del_ExpandFile(ExpandFile *ef); + +/* + * A container of the following type is returned by ef_expand_file(). + */ +typedef struct { + int exists; /* True if the files in files[] currently exist. */ + /* This only time that this may not be true is if */ + /* the input filename didn't contain any wildcards */ + /* and thus wasn't matched against existing files. */ + /* In this case the single entry in 'nfile' may not */ + /* refer to an existing file. */ + int nfile; /* The number of files in files[] */ + char **files; /* An array of 'nfile' filenames. */ +} FileExpansion; + +/* + * The ef_expand_file() function expands a specified pathname, converting + * ~user/ and ~/ patterns at the start of the pathname to the + * corresponding home directories, replacing $envvar with the value of + * the corresponding environment variable, and then, if there are any + * wildcards, matching these against existing filenames. + * + * If no errors occur, a container is returned containing the array of + * files that resulted from the expansion. If there were no wildcards + * in the input pathname, this will contain just the original pathname + * after expansion of ~ and $ expressions. If there were any wildcards, + * then the array will contain the files that matched them. Note that + * if there were any wildcards but no existing files match them, this + * is counted as an error and NULL is returned. + * + * The supported wildcards and their meanings are: + * * - Match any sequence of zero or more characters. + * ? - Match any single character. + * [chars] - Match any single character that appears in 'chars'. + * If 'chars' contains an expression of the form a-b, + * then any character between a and b, including a and b, + * matches. The '-' character looses its special meaning + * as a range specifier when it appears at the start + * of the sequence of characters. + * [^chars] - The same as [chars] except that it matches any single + * character that doesn't appear in 'chars'. + * + * Wildcard expressions are applied to individual filename components. + * They don't match across directory separators. A '.' character at + * the beginning of a filename component must also be matched + * explicitly by a '.' character in the input pathname, since these + * are UNIX's hidden files. + * + * Input: + * fe ExpandFile * The pathname expansion resource object. + * path const char * The path name to be expanded. + * pathlen int The length of the suffix of path[] that + * constitutes the filename to be expanded, + * or -1 to specify that the whole of the + * path string should be used. + * Output: + * return FileExpansion * A pointer to a results container within the + * given ExpandFile object. This contains an + * array of the pathnames that resulted from + * expanding ~ and $ expressions and from + * matching any wildcards, sorted into lexical + * order. + * + * This container and its contents will be + * recycled on subsequent calls, so if you need + * to keep the results of two successive runs, + * you will either have to allocate a private + * copy of the array, or use two ExpandFile + * objects. + * + * On error, NULL is returned. A description + * of the error can be acquired by calling the + * ef_last_error() function. + */ +FileExpansion *ef_expand_file(ExpandFile *ef, const char *path, int pathlen); + +/*....................................................................... + * Print out an array of matching files. + * + * Input: + * result FileExpansion * The container of the sorted array of + * expansions. + * fp FILE * The output stream to write to. + * term_width int The width of the terminal. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int ef_list_expansions(FileExpansion *result, FILE *fp, int term_width); + +/* + * The ef_last_error() function returns a description of the last error + * that occurred in a call ef_expand_file(). Note that this message is + * contained in an array which is allocated as part of *ef, and its + * contents thus potentially change on every call to ef_expand_file(). + */ +const char *ef_last_error(ExpandFile *ef); + +/*----------------------------------------------------------------------- + * The WordCompletion module is used for completing incomplete words, such + * as filenames. Programs can use functions within this module to register + * their own customized completion functions. + *-----------------------------------------------------------------------*/ + +/* + * Ambiguous completion matches are recorded in objects of the + * following type. + */ +typedef struct WordCompletion WordCompletion; + +/* + * Create a new completion object. + */ +WordCompletion *new_WordCompletion(void); + +/* + * Delete a redundant completion object. + */ +WordCompletion *del_WordCompletion(WordCompletion *cpl); + +/*....................................................................... + * Callback functions declared and prototyped using the following macro + * are called upon to return an array of possible completion suffixes + * for the token that precedes a specified location in the given + * input line. It is up to this function to figure out where the token + * starts, and to call cpl_add_completion() to register each possible + * completion before returning. + * + * Input: + * cpl WordCompletion * An opaque pointer to the object that will + * contain the matches. This should be filled + * via zero or more calls to cpl_add_completion(). + * data void * The anonymous 'data' argument that was + * passed to cpl_complete_word() or + * gl_customize_completion()). + * line const char * The current input line. + * word_end int The index of the character in line[] which + * follows the end of the token that is being + * completed. + * Output + * return int 0 - OK. + * 1 - Error. + */ +#define CPL_MATCH_FN(fn) int (fn)(WordCompletion *cpl, void *data, \ + const char *line, int word_end) +typedef CPL_MATCH_FN(CplMatchFn); + +/*....................................................................... + * Optional callback functions declared and prototyped using the + * following macro are called upon to return non-zero if a given + * file, specified by its pathname, is to be included in a list of + * completions. + * + * Input: + * data void * The application specified pointer which + * was specified when this callback function + * was registered. This can be used to have + * anything you like passed to your callback. + * pathname const char * The pathname of the file to be checked to + * see if it should be included in the list + * of completions. + * Output + * return int 0 - Ignore this file. + * 1 - Do include this file in the list + * of completions. + */ +#define CPL_CHECK_FN(fn) int (fn)(void *data, const char *pathname) +typedef CPL_CHECK_FN(CplCheckFn); + +/* + * You can use the following CplCheckFn callback function to only + * have executables included in a list of completions. + */ +CPL_CHECK_FN(cpl_check_exe); + +/* + * cpl_file_completions() is the builtin filename completion callback + * function. This can also be called by your own custom CPL_MATCH_FN() + * callback functions. To do this pass on all of the arguments of your + * custom callback function to cpl_file_completions(), with the exception + * of the (void *data) argument. The data argument should either be passed + * NULL to request the default behaviour of the file-completion function, + * or be passed a pointer to a CplFileConf structure (see below). In the + * latter case the contents of the structure modify the behavior of the + * file-completer. + */ +CPL_MATCH_FN(cpl_file_completions); + +/* + * Objects of the following type can be used to change the default + * behavior of the cpl_file_completions() callback function. + */ +typedef struct CplFileConf CplFileConf; + +/* + * If you want to change the behavior of the cpl_file_completions() + * callback function, call the following function to allocate a + * configuration object, then call one or more of the subsequent + * functions to change any of the default configuration parameters + * that you don't want. This function returns NULL when there is + * insufficient memory. + */ +CplFileConf *new_CplFileConf(void); + +/* + * If backslashes in the prefix being passed to cpl_file_completions() + * should be treated as literal characters, call the following function + * with literal=1. Otherwise the default is to treat them as escape + * characters which remove the special meanings of spaces etc.. + */ +void cfc_literal_escapes(CplFileConf *cfc, int literal); + +/* + * Before calling cpl_file_completions(), call this function if you + * know the index at which the filename prefix starts in the input line. + * Otherwise by default, or if you specify start_index to be -1, the + * filename is taken to start after the first unescaped space preceding + * the cursor, or the start of the line, which ever comes first. + */ +void cfc_file_start(CplFileConf *cfc, int start_index); + +/* + * If you only want certain types of files to be included in the + * list of completions, use the following function to specify a + * callback function which will be called to ask whether a given file + * should be included. The chk_data argument is will be passed to the + * callback function whenever it is called and can be anything you want. + */ +void cfc_set_check_fn(CplFileConf *cfc, CplCheckFn *chk_fn, void *chk_data); + +/* + * The following function deletes a CplFileConf objects previously + * returned by new_CplFileConf(). It always returns NULL. + */ +CplFileConf *del_CplFileConf(CplFileConf *cfc); + +/* + * The following configuration structure is deprecated. Do not change + * its contents, since this will break any programs that still use it, + * and don't use it in new programs. Instead use opaque CplFileConf + * objects as described above. cpl_file_completions() figures out + * what type of structure you pass it, by virtue of a magic int code + * placed at the start of CplFileConf object by new_CplFileConf(). + */ +typedef struct { + int escaped; /* Opposite to the argument of cfc_literal_escapes() */ + int file_start; /* Equivalent to the argument of cfc_file_start() */ +} CplFileArgs; +/* + * This initializes the deprecated CplFileArgs structures. + */ +void cpl_init_FileArgs(CplFileArgs *cfa); + +/*....................................................................... + * When an error occurs while performing a completion, custom completion + * callback functions should register a terse description of the error + * by calling cpl_record_error(). This message will then be returned on + * the next call to cpl_last_error() and used by getline to display an + * error message to the user. + * + * Input: + * cpl WordCompletion * The string-completion resource object that was + * originally passed to the callback. + * errmsg const char * The description of the error. + */ +void cpl_record_error(WordCompletion *cpl, const char *errmsg); + +/*....................................................................... + * This function can be used to replace the builtin filename-completion + * function with one of the user's choice. The user's completion function + * has the option of calling the builtin filename-completion function + * if it believes that the token that it has been presented with is a + * filename (see cpl_file_completions() above). + * + * Input: + * gl GetLine * The resource object of the command-line input + * module. + * data void * This is passed to match_fn() whenever it is + * called. It could, for example, point to a + * symbol table that match_fn() would look up + * matches in. + * match_fn CplMatchFn * The function that will identify the prefix + * to be completed from the input line, and + * report matching symbols. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int gl_customize_completion(GetLine *gl, void *data, CplMatchFn *match_fn); + +/*....................................................................... + * Change the terminal (or stream) that getline interacts with. + * + * Input: + * gl GetLine * The resource object of the command-line input + * module. + * input_fp FILE * The stdio stream to read from. + * output_fp FILE * The stdio stream to write to. + * term const char * The terminal type. This can be NULL if + * either or both of input_fp and output_fp don't + * refer to a terminal. Otherwise it should refer + * to an entry in the terminal information database. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int gl_change_terminal(GetLine *gl, FILE *input_fp, FILE *output_fp, + const char *term); + +/*....................................................................... + * The following functions can be used to save and restore the contents + * of the history buffer. + * + * Input: + * gl GetLine * The resource object of the command-line input + * module. + * filename const char * The name of the new file to write to. + * comment const char * Extra information such as timestamps will + * be recorded on a line started with this + * string, the idea being that the file can + * double as a command file. Specify "" if + * you don't care. Be sure to specify the + * same string to both functions. + * max_lines int The maximum number of lines to save, or -1 + * to save all of the lines in the history + * list. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int gl_save_history(GetLine *gl, const char *filename, const char *comment, + int max_lines); +int gl_load_history(GetLine *gl, const char *filename, const char *comment); + +/* + * Enumerate file-descriptor events that can be waited for. + */ +typedef enum { + GLFD_READ, /* Watch for data waiting to be read from a file descriptor */ + GLFD_WRITE, /* Watch for ability to write to a file descriptor */ + GLFD_URGENT /* Watch for urgent out-of-band data on the file descriptor */ +} GlFdEvent; + +/* + * The following enumeration is used for the return status of file + * descriptor event callbacks. + */ +typedef enum { + GLFD_ABORT, /* Cause gl_get_line() to abort with an error */ + GLFD_REFRESH, /* Redraw the input line and continue waiting for input */ + GLFD_CONTINUE /* Continue to wait for input, without redrawing the line */ +} GlFdStatus; + +/*....................................................................... + * While gl_get_line() is waiting for terminal input, it can also be + * asked to listen for activity on arbitrary file descriptors. + * Callback functions of the following type can be registered to be + * called when activity is seen. If your callback needs to write to + * the terminal or use signals, please see the gl_get_line(3) man + * page. + * + * Input: + * gl GetLine * The gl_get_line() resource object. You can use + * this safely to call gl_watch_fd() or + * gl_watch_time(). The effect of calling other + * functions that take a gl argument is undefined, + * and must be avoided. + * data void * A pointer to arbitrary callback data, as originally + * registered with gl_watch_fd(). + * fd int The file descriptor that has activity. + * event GlFdEvent The activity seen on the file descriptor. The + * inclusion of this argument allows the same + * callback to be registered for multiple events. + * Output: + * return GlFdStatus GLFD_ABORT - Cause gl_get_line() to abort with + * an error (set errno if you need it). + * GLFD_REFRESH - Redraw the input line and continue + * waiting for input. Use this if you + * wrote something to the terminal. + * GLFD_CONTINUE - Continue to wait for input, without + * redrawing the line. + */ +#define GL_FD_EVENT_FN(fn) GlFdStatus (fn)(GetLine *gl, void *data, int fd, \ + GlFdEvent event) +typedef GL_FD_EVENT_FN(GlFdEventFn); + +/*....................................................................... + * Where possible, register a function and associated data to be called + * whenever a specified event is seen on a file descriptor. + * + * Input: + * gl GetLine * The resource object of the command-line input + * module. + * fd int The file descriptor to watch. + * event GlFdEvent The type of activity to watch for. + * callback GlFdEventFn * The function to call when the specified + * event occurs. Setting this to 0 removes + * any existing callback. + * data void * A pointer to arbitrary data to pass to the + * callback function. + * Output: + * return int 0 - OK. + * 1 - Either gl==NULL, or this facility isn't + * available on the the host system + * (ie. select() isn't available). No + * error message is generated in the latter + * case. + */ +int gl_watch_fd(GetLine *gl, int fd, GlFdEvent event, + GlFdEventFn *callback, void *data); + +/*....................................................................... + * Switch history streams. History streams represent separate history + * lists recorded within a single history buffer. Different streams + * are distinguished by integer identifiers chosen by the calling + * appplicaton. Initially new_GetLine() sets the stream identifier to + * 0. Whenever a new line is appended to the history list, the current + * stream identifier is recorded with it, and history lookups only + * consider lines marked with the current stream identifier. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * id unsigned The new history stream identifier. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int gl_group_history(GetLine *gl, unsigned id); + +/*....................................................................... + * Display the contents of the history list. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * fp FILE * The stdio output stream to write to. + * fmt const char * A format string. This containing characters to be + * written verbatim, plus any of the following + * format directives: + * %D - The date, formatted like 2001-11-20 + * %T - The time of day, formatted like 23:59:59 + * %N - The sequential entry number of the + * line in the history buffer. + * %G - The number of the history group that + * the line belongs to. + * %% - A literal % character. + * %H - The history line itself. + * Note that a '\n' newline character is not + * appended by default. + * all_groups int If true, display history lines from all + * history groups. Otherwise only display + * those of the current history group. + * max_lines int If max_lines is < 0, all available lines + * are displayed. Otherwise only the most + * recent max_lines lines will be displayed. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int gl_show_history(GetLine *gl, FILE *fp, const char *fmt, int all_groups, + int max_lines); + +/*....................................................................... + * Resize or delete the history buffer. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * bufsize size_t The number of bytes in the history buffer, or 0 + * to delete the buffer completely. + * Output: + * return int 0 - OK. + * 1 - Insufficient memory (the previous buffer + * will have been retained). No error message + * will be displayed. + */ +int gl_resize_history(GetLine *gl, size_t bufsize); + +/*....................................................................... + * Set an upper limit to the number of lines that can be recorded in the + * history list, or remove a previously specified limit. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * max_lines int The maximum number of lines to allow, or -1 to + * cancel a previous limit and allow as many lines + * as will fit in the current history buffer size. + */ +void gl_limit_history(GetLine *gl, int max_lines); + +/*....................................................................... + * Discard either all historical lines, or just those associated with the + * current history group. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * all_groups int If true, clear all of the history. If false, + * clear only the stored lines associated with the + * currently selected history group. + */ +void gl_clear_history(GetLine *gl, int all_groups); + +/*....................................................................... + * Temporarily enable or disable the gl_get_line() history mechanism. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * enable int If true, turn on the history mechanism. If + * false, disable it. + */ +void gl_toggle_history(GetLine *gl, int enable); + +/* + * Objects of the following type are returned by gl_terminal_size(). + */ +typedef struct { + int nline; /* The terminal has nline lines */ + int ncolumn; /* The terminal has ncolumn columns */ +} GlTerminalSize; + +/*....................................................................... + * Update if necessary, and return the current size of the terminal. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * def_ncolumn int If the number of columns in the terminal + * can't be determined, substitute this number. + * def_nline int If the number of lines in the terminal can't + * be determined, substitute this number. + * Output: + * return GlTerminalSize The current terminal size. + */ +GlTerminalSize gl_terminal_size(GetLine *gl, int def_ncolumn, int def_nline); + +/* + * The gl_lookup_history() function returns information in an + * argument of the following type. + */ +typedef struct { + const char *line; /* The requested history line */ + unsigned group; /* The history group to which the */ + /* line belongs. */ + time_t timestamp; /* The date and time at which the */ + /* line was originally entered. */ +} GlHistoryLine; + +/*....................................................................... + * Lookup a history line by its sequential number of entry in the + * history buffer. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * id unsigned long The identification number of the line to + * be returned, where 0 denotes the first line + * that was entered in the history list, and + * each subsequently added line has a number + * one greater than the previous one. For + * the range of lines currently in the list, + * see the gl_range_of_history() function. + * Input/Output: + * line GlHistoryLine * A pointer to the variable in which to + * return the details of the line. + * Output: + * return int 0 - The line is no longer in the history + * list, and *line has not been changed. + * 1 - The requested line can be found in + * *line. Note that the string in + * line->line is part of the history + * buffer and will change, so a private + * copy should be made if you wish to + * use it after subsequent calls to any + * functions that take gl as an argument. + */ +int gl_lookup_history(GetLine *gl, unsigned long id, GlHistoryLine *line); + +/* + * The gl_state_of_history() function returns information in an argument + * of the following type. + */ +typedef struct { + int enabled; /* True if history is enabled */ + unsigned group; /* The current history group */ + int max_lines; /* The current upper limit on the number of lines */ + /* in the history list, or -1 if unlimited. */ +} GlHistoryState; + +/*....................................................................... + * Query the state of the history list. Note that any of the input/output + * pointers can be specified as NULL. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * Input/Output: + * state GlHistoryState * A pointer to the variable in which to record + * the return values. + */ +void gl_state_of_history(GetLine *gl, GlHistoryState *state); + +/* + * The gl_range_of_history() function returns information in an argument + * of the following type. + */ +typedef struct { + unsigned long oldest; /* The sequential entry number of the oldest */ + /* line in the history list. */ + unsigned long newest; /* The sequential entry number of the newest */ + /* line in the history list. */ + int nlines; /* The number of lines in the history list */ +} GlHistoryRange; + +/*....................................................................... + * Query the number and range of lines in the history buffer. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * range GlHistoryRange * A pointer to the variable in which to record + * the return values. If range->nline=0, the + * range of lines will be given as 0-0. + */ +void gl_range_of_history(GetLine *gl, GlHistoryRange *range); + +/* + * The gl_size_of_history() function returns information in an argument + * of the following type. + */ +typedef struct { + size_t size; /* The size of the history buffer (bytes) */ + size_t used; /* The number of bytes of the history buffer */ + /* that are currently occupied. */ +} GlHistorySize; + +/*....................................................................... + * Return the size of the history buffer and the amount of the + * buffer that is currently in use. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * Input/Output: + * GlHistorySize size * A pointer to the variable in which to return + * the results. + */ +void gl_size_of_history(GetLine *gl, GlHistorySize *size); + +/*....................................................................... + * Specify whether text that users type should be displayed or hidden. + * In the latter case, only the prompt is displayed, and the final + * input line is not archived in the history list. + * + * Input: + * gl GetLine * The input-line history maintenance object. + * enable int 0 - Disable echoing. + * 1 - Enable echoing. + * -1 - Just query the mode without changing it. + * Output: + * return int The echoing disposition that was in effect + * before this function was called: + * 0 - Echoing was disabled. + * 1 - Echoing was enabled. + */ +int gl_echo_mode(GetLine *gl, int enable); + +/*....................................................................... + * This function can be called from gl_get_line() callbacks to have + * the prompt changed when they return. It has no effect if gl_get_line() + * is not currently being invoked. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * prompt const char * The new prompt. + */ +void gl_replace_prompt(GetLine *gl, const char *prompt); + +/* + * Enumerate the available prompt formatting styles. + */ +typedef enum { + GL_LITERAL_PROMPT, /* Display the prompt string literally */ + GL_FORMAT_PROMPT /* The prompt string can contain any of the */ + /* following formatting directives: */ + /* %B - Display subsequent characters */ + /* with a bold font. */ + /* %b - Stop displaying characters */ + /* with the bold font. */ + /* %U - Underline subsequent characters. */ + /* %u - Stop underlining characters. */ + /* %S - Highlight subsequent characters */ + /* (also known as standout mode). */ + /* %s - Stop highlighting characters */ + /* %% - Display a single % character. */ +} GlPromptStyle; + +/*....................................................................... + * Specify whether to heed text attribute directives within prompt + * strings. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * style GlPromptStyle The style of prompt (see the definition of + * GlPromptStyle in libtecla.h for details). + */ +void gl_prompt_style(GetLine *gl, GlPromptStyle style); + +/*....................................................................... + * Remove a signal from the list of signals that gl_get_line() traps. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * signo int The number of the signal to be ignored. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int gl_ignore_signal(GetLine *gl, int signo); + +/* + * A bitwise union of the following enumerators is passed to + * gl_trap_signal() to specify the environment in which the + * application's signal handler is to be called. + */ +typedef enum { + GLS_RESTORE_SIG=1, /* Restore the caller's signal environment */ + /* while handling the signal. */ + GLS_RESTORE_TTY=2, /* Restore the caller's terminal settings */ + /* while handling the signal. */ + GLS_RESTORE_LINE=4, /* Move the cursor to the start of the next line */ + GLS_REDRAW_LINE=8, /* Redraw the input line when the signal handler */ + /* returns. */ + GLS_UNBLOCK_SIG=16, /* Normally a signal who's delivery is found to */ + /* be blocked by the calling application is not */ + /* trapped by gl_get_line(). Including this flag */ + /* causes it to be temporarily unblocked and */ + /* trapped while gl_get_line() is executing. */ + GLS_DONT_FORWARD=32,/* Don't forward the signal to the signal handler */ + /* of the calling program. */ + GLS_RESTORE_ENV = GLS_RESTORE_SIG | GLS_RESTORE_TTY | GLS_REDRAW_LINE, + GLS_SUSPEND_INPUT = GLS_RESTORE_ENV | GLS_RESTORE_LINE +} GlSignalFlags; + +/* + * The following enumerators are passed to gl_trap_signal() to tell + * it what to do after the application's signal handler has been called. + */ +typedef enum { + GLS_RETURN, /* Return the line as though the user had pressed the */ + /* return key. */ + GLS_ABORT, /* Cause gl_get_line() to return NULL */ + GLS_CONTINUE /* After handling the signal, resume command line editing */ +} GlAfterSignal; + +/*....................................................................... + * Tell gl_get_line() how to respond to a given signal. This can be used + * both to override the default responses to signals that gl_get_line() + * normally catches and to add new signals to the list that are to be + * caught. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * signo int The number of the signal to be caught. + * flags unsigned A bitwise union of GlSignalFlags enumerators. + * after GlAfterSignal What to do after the application's signal + * handler has been called. + * errno_value int The value to set errno to. + * Output: + * return int 0 - OK. + * 1 - Insufficient memory to record the + * new signal disposition. + */ +int gl_trap_signal(GetLine *gl, int signo, unsigned flags, + GlAfterSignal after, int errno_value); + +/*....................................................................... + * Return the last signal that was caught by the most recent call to + * gl_get_line(), or -1 if no signals were caught. This is useful if + * gl_get_line() returns errno=EINTR and you need to find out what signal + * caused it to abort. + * + * Input: + * gl GetLine * The resource object of gl_get_line(). + * Output: + * return int The last signal caught by the most recent + * call to gl_get_line(), or -1 if no signals + * were caught. + */ +int gl_last_signal(const GetLine *gl); + +/*....................................................................... + * This function is designed to be called by CPL_MATCH_FN() callback + * functions. It adds one possible completion of the token that is being + * completed to an array of completions. If the completion needs any + * special quoting to be valid when displayed in the input line, this + * quoting must be included in the string. + * + * Input: + * cpl WordCompletion * The argument of the same name that was passed + * to the calling CPL_MATCH_FN() callback function. + * line const char * The input line, as received by the callback + * function. + * word_start int The index within line[] of the start of the + * word that is being completed. If an empty + * string is being completed, set this to be + * the same as word_end. + * word_end int The index within line[] of the character which + * follows the incomplete word, as received by the + * callback function. + * suffix const char * The appropriately quoted string that could + * be appended to the incomplete token to complete + * it. A copy of this string will be allocated + * internally. + * type_suffix const char * When listing multiple completions, gl_get_line() + * appends this string to the completion to indicate + * its type to the user. If not pertinent pass "". + * Otherwise pass a literal or static string. + * cont_suffix const char * If this turns out to be the only completion, + * gl_get_line() will append this string as + * a continuation. For example, the builtin + * file-completion callback registers a directory + * separator here for directory matches, and a + * space otherwise. If the match were a function + * name you might want to append an open + * parenthesis, etc.. If not relevant pass "". + * Otherwise pass a literal or static string. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int cpl_add_completion(WordCompletion *cpl, const char *line, + int word_start, int word_end, const char *suffix, + const char *type_suffix, const char *cont_suffix); + +/* + * Each possible completion string is recorded in an array element of + * the following type. + */ +typedef struct { + char *completion; /* The matching completion string */ + char *suffix; /* The pointer into completion[] at which the */ + /* string was extended. */ + const char *type_suffix; /* A suffix to be added when listing completions */ + /* to indicate the type of the completion. */ +} CplMatch; + +/* + * Completions are returned in a container of the following form. + */ +typedef struct { + char *suffix; /* The common initial part of all of the */ + /* completion suffixes. */ + const char *cont_suffix; /* Optional continuation string to be appended to */ + /* the sole completion when nmatch==1. */ + CplMatch *matches; /* The array of possible completion strings, */ + /* sorted into lexical order. */ + int nmatch; /* The number of elements in matches[] */ +} CplMatches; + +/*....................................................................... + * Given an input line and the point at which completion is to be + * attempted, return an array of possible completions. + * + * Input: + * cpl WordCompletion * The word-completion resource object. + * line const char * The current input line. + * word_end int The index of the character in line[] which + * follows the end of the token that is being + * completed. + * data void * Anonymous 'data' to be passed to match_fn(). + * match_fn CplMatchFn * The function that will identify the prefix + * to be completed from the input line, and + * record completion suffixes. + * Output: + * return CplMatches * The container of the array of possible + * completions. The returned pointer refers + * to a container owned by the parent Completion + * object, and its contents thus potentially + * change on every call to cpl_matches(). + */ +CplMatches *cpl_complete_word(WordCompletion *cpl, const char *line, + int word_end, void *data, + CplMatchFn *match_fn); + +/*....................................................................... + * Print out an array of matching completions. + * + * Input: + * result CplMatches * The container of the sorted array of + * completions. + * fp FILE * The output stream to write to. + * term_width int The width of the terminal. + * Output: + * return int 0 - OK. + * 1 - Error. + */ +int cpl_list_completions(CplMatches *result, FILE *fp, int term_width); + +/*....................................................................... + * Return a description of the error that occurred on the last call to + * cpl_complete_word() or cpl_add_completion(). + * + * Input: + * cpl WordCompletion * The string-completion resource object. + * Output: + * return const char * The description of the last error. + */ +const char *cpl_last_error(WordCompletion *cpl); + +/* + * PathCache objects encapsulate the resources needed to record + * files of interest from comma-separated lists of directories. + */ +typedef struct PathCache PathCache; + +/*....................................................................... + * Create an object who's function is to maintain a cache of filenames + * found within a list of directories, and provide quick lookup and + * completion of selected files in this cache. + * + * Output: + * return PathCache * The new, initially empty cache, or NULL + * on error. + */ +PathCache *new_PathCache(void); + +/*....................................................................... + * Delete a given cache of files, returning the resources that it + * was using to the system. + * + * Input: + * pc PathCache * The cache to be deleted (can be NULL). + * Output: + * return PathCache * The deleted object (ie. allways NULL). + */ +PathCache *del_PathCache(PathCache *pc); + +/*....................................................................... + * Return a description of the last path-caching error that occurred. + * + * Input: + * pc PathCache * The filename cache that suffered the error. + * Output: + * return char * The description of the last error. + */ +const char *pca_last_error(PathCache *pc); + +/*....................................................................... + * Build the list of files of interest contained in a given + * colon-separated list of directories. + * + * Input: + * pc PathCache * The cache in which to store the names of + * the files that are found in the list of + * directories. + * path const char * A colon-separated list of directory + * paths. Under UNIX, when searching for + * executables, this should be the return + * value of getenv("PATH"). + * Output: + * return int 0 - OK. + * 1 - An error occurred. + */ +int pca_scan_path(PathCache *pc, const char *path); + +/*....................................................................... + * If you want subsequent calls to pca_lookup_file() and + * pca_path_completions() to only return the filenames of certain + * types of files, for example executables, or filenames ending in + * ".ps", call this function to register a file-selection callback + * function. This callback function takes the full pathname of a file, + * plus application-specific data, and returns 1 if the file is of + * interest, and zero otherwise. + * + * Input: + * pc PathCache * The filename cache. + * check_fn CplCheckFn * The function to call to see if the name of + * a given file should be included in the + * cache. This determines what type of files + * will reside in the cache. To revert to + * selecting all files, regardless of type, + * pass 0 here. + * data void * You can pass a pointer to anything you + * like here, including NULL. It will be + * passed to your check_fn() callback + * function, for its private use. + */ +void pca_set_check_fn(PathCache *pc, CplCheckFn *check_fn, void *data); + +/*....................................................................... + * Given the simple name of a file, search the cached list of files + * in the order in which they where found in the list of directories + * previously presented to pca_scan_path(), and return the pathname + * of the first file which has this name. + * + * Input: + * pc PathCache * The cached list of files. + * name const char * The name of the file to lookup. + * name_len int The length of the filename substring at the + * beginning of name[], or -1 to assume that the + * filename occupies the whole of the string. + * literal int If this argument is zero, lone backslashes + * in name[] are ignored during comparison + * with filenames in the cache, under the + * assumption that they were in the input line + * soley to escape the special significance of + * characters like spaces. To have them treated + * as normal characters, give this argument a + * non-zero value, such as 1. + * Output: + * return char * The pathname of the first matching file, + * or NULL if not found. Note that the returned + * pointer points to memory owned by *pc, and + * will become invalid on the next call. + */ +char *pca_lookup_file(PathCache *pc, const char *name, int name_len, + int literal); + +/* + * Objects of the following type can be used to change the default + * behavior of the pca_path_completions() callback function. + */ +typedef struct PcaPathConf PcaPathConf; + +/* + * pca_path_completions() is a completion callback function for use directly + * with cpl_complete_word() or gl_customize_completions(), or indirectly + * from your own completion callback function. It requires that a PcaPathConf + * object be passed via its 'void *data' argument (see below). + */ +CPL_MATCH_FN(pca_path_completions); + +/*....................................................................... + * Allocate and initialize a pca_path_completions() configuration object. + * + * Input: + * pc PathCache * The filename cache in which to look for + * file name completions. + * Output: + * return PcaPathConf * The new configuration structure, or NULL + * on error. + */ +PcaPathConf *new_PcaPathConf(PathCache *pc); + +/*....................................................................... + * Deallocate memory, previously allocated by new_PcaPathConf(). + * + * Input: + * ppc PcaPathConf * Any pointer previously returned by + * new_PcaPathConf() [NULL is allowed]. + * Output: + * return PcaPathConf * The deleted structure (always NULL). + */ +PcaPathConf *del_PcaPathConf(PcaPathConf *ppc); + +/* + * If backslashes in the prefix being passed to pca_path_completions() + * should be treated as literal characters, call the following function + * with literal=1. Otherwise the default is to treat them as escape + * characters which remove the special meanings of spaces etc.. + */ +void ppc_literal_escapes(PcaPathConf *ppc, int literal); + +/* + * Before calling pca_path_completions, call this function if you know + * the index at which the filename prefix starts in the input line. + * Otherwise by default, or if you specify start_index to be -1, the + * filename is taken to start after the first unescaped space preceding + * the cursor, or the start of the line, whichever comes first. + */ +void ppc_file_start(PcaPathConf *ppc, int start_index); + +#ifdef __cplusplus +} +#endif + +#endif |