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<html><head><title>The tecla library change log</title></head>
<body bgcolor="#add8e6"><pre>
In the following log, modification dates are listed using the European
convention in which the day comes before the month (ie. DD/MM/YYYY).
The most recent modifications are listed first.
09/11/2014 mcs@astro.caltech.edu
configure.in configure
Dominyk Tiller reported that libtecla didn't compile on
Mac OS X, due to libgcc.a being cited in the makefile
without any path. This turned out to be because Gnu
autoconf claims that the clang compiler is gcc, and clang
has a -print-libgcc-file-name, but this only prints
libgcc.a. I have modified the configure script to check
whether the path returned by -print-libgcc-file-name
actually exists and only use it if it does.
27/10/2014 Jon Szymaniak (documented here by mcs@astro.caltech.edu)
Makefile.rules
Use $(AR) instead of plain ar, so that cross-compilation
uses the correct ar program when cross-compiling.
Add $(TARGETS) dependency to building the demo programs
and the enhance program. When using parallel compilation
this is needed to ensure that the library is compiled
before the demos.
10/04/2013 mcs@astro.caltech.edu
Makefile.in
Jonathan Niehof reported that libtecla wouldn't compile if
there were spaces in LDFLAGS and pointed out that there should
be quotes around $(LDFLAGS) in Makefile.in. This also applied
to a few other variables cited in the same way.
10/06/2012 mcs@astro.caltech.edu
enhance.c configure.in
I had incorrectly assumed that system-V pseudo-terminal
allocation and system-V streams terminals always went
together. However system-V pseudo terminal allocation is
now part of UNIX98, and this has been adopted into many BSD
style operating systems, without the use of system-V
streams. On such systems the lack of system-V streams IOCTL
opcodes prevented system-V pseudo-terminal allocation being
used. This was hidden under Linux until recently, because
it had a stropts.h file, which made it appear as though
Linux supported system-V streams terminals.
I have now created separate configuration tests and options
in the configure script for system-V terminal allocation
and system-V streams. On systems that only have the former,
the latter won't be used.
16/05/2005 mcs@astro.caltech.edu
getline.c
When an initial input line was presented to gl_get_line()
for editing, the new input line was incorrectly appended to
the previous input line, instead of replacing it.
10/01/2004 Derek Jones (documented here by mcs@astro.caltech.edu)
getline.c
Derek discovered that the function that computes the
width of the prompt, was not correctly skipping over 3 of
the 6 possible prompt-formatting directives. Thus, when
the %f,%p or %v prompt-formatting directives were used,
the width of the prompt was incorrectly calculated. The
fix was to copy the list of directives from
gl_display_prompt(). I have also added a comment to
gl_display_prompt(), to warn anybody who adds or removes
formatting directives there, to also do the same to
gl_displayed_prompt_width().
31/10/2004 mcs@astro.caltech.edu (problem reported by Godfrey van der Linden)
getline.c
The gl_event_handler() function had the endif of a
conditional compilation clause in the wrong place. This
only upset the compiler on unusual systems that don't
have select(). The problem was seen under Mac OS X, due
to the configuration problem in 1.6.0 that caused the
configure script to mistakenly report that select wasn't
available.
31/10/2004 mcs@astro.caltech.edu (info provided by Ivan Rayner)
configure.in configure Makefile.in
Ivan reported that under IRIX 6.5 it is necessary to add
-D_XOPEN_SOURCE=500 to the compiler flags, when compiling
the reentrant version of the library. Thus, whereas
previously I hardwired the value of DEFINES_R in
Makefile.in, I have now made this a variable in the
configure script, which is augmented with the above
addition, within an IRIX-specific switch clause.
Also apparently configure leaves the RANLIB variable
blank, instead of setting it to ":", so I have now
explicitly set this to ":", within the new IRIX clause of
the configure script.
31/10/2004 mcs@astro.caltech.edu (info provided by Ivan Rayner)
getline.c
Under IRIX, the compiler warned that gl_read_unmasked()
was returning an int, which was then being assigned to an
enumeration type. This is techically fine, but it
highlighted the fact that I had meant to declare
gl_read_unmasked() to directly return the enumerated
type. I have now done so.
26/09/2004 mcs@astro.caltech.edu
getline.c
Users can now turn off interactive command-line editing
by setting the TERM environment variable to the word "dumb".
18/07/2004 mcs@astro.caltech.edu (problem noted by Michael MacFaden)
getline.c
Calling gl_terminal_size() on a system without support
for SIGWINCH caused a divide-by-zero error in an unintended
call to gl_erase_line(), because gl_update_size() was
incorrectly being called to query the terminal size,
instead of gl_query_size().
18/07/2004 Padraig Brady (documented here by mcs@astro.caltech.edu)
getline.c
The suspend and termination signal-handlers installed by
gl_tty_signals(), were being installed swapped.
03/06/2004 Mike Meaney (documented here by mcs@astro.caltech.edu)
getline.c
Mike pointed out the fact that the curses setupterm()
function is actually documented to exit the application
if an error occurs while its optional errret argument is
NULL. I hadn't noticed this, and because I didn't need
the extra information returned in the errret argument, I
was passing it a NULL. As suggested by Mike, I now pass
this argument a pointer to a dummy errret variable.
23/05/2004 mcs@astro.caltech.edu (problem noted by John Beck)
man/func/cpl_complete_word.in
Some of the prototypes of functions and types documented
by the cpl_complete_word man page, weren't listed in the
Synopsis section of this man page. They are now listed
there.
23/05/2004 mcs@astro.caltech.edu
getline.c man/func/gl_get_line.in
I have now added support for calling gl_normal_io() from
any callback functions that the application installs by
calling either gl_inactivity_timeout(), or gl_watch_fd().
Previously, if one of these callback functions called
gl_normal_io(), then after returning to gl_get_line(),
gl_get_line() would incorrectly assume that the terminal
was still in raw I/O mode. Now, gl_get_line() checks to
see if gl_normal_io() was called by the callback, and
if so, calls _gl_raw_io() to reinstate raw I/O mode.
21/05/2004 mcs@astro.caltech.edu
configure.in configure
On Mac OS X the code that the configure script used to
check for select() failed due to missing symbols in
sys/select.h. Moving the inclusion of sys/select.h to
after the inclusion of sys/time.h, sys/types.h and
sys/unistd.h fixed this.
11/05/2004 mcs@astro.caltech.edu
getline.c man/func/gl_get_line.in
If the line buffer returned by one call to gl_get_line()
was passed as the start_line argument of the next call to
gl_get_line(), then instead of the just-entered line
being presented back to the user for further editing, the
start_line argument was effectively ignored, because the
line buffer whose pointer was being passed back, was
being cleared before the start_line pointer was examined.
This appears to have been a case of me incorrectly
thinking that I had forgotten to initialize gl->line[]
and gl->ntotal in the gl_reset_input_line() function, and
then "fixing" this supposed omission. Removing this
erroneous fix, restored things to how they were meant to
be. To make it unlikely that I will make the same mistake
again, I have renamed the function from
gl_reset_input_line() to gl_reset_editor(), to stop it
looking as though it is meant to reset the contents of
the input line (that is what gl_truncate_buffer() is
for), explicitly stated that it doesn't clear the input
line, in the header comments of the function, and added a
prominent warning comment in the body of the function.
Also, since support for passing back the returned line
pointer via the start_line argument of the next call to
gl_get_line(), wasn't documented in the man page, but was
meant to be supported, and definitely used to work, I
have now amended the man page documentation of
gl_get_line() to explicitly state that this feature is
officially supported.
2?/04/2004 Released 1.6.0
22/04/2004 mcs@astro.caltech.edu (Fixed a bug reported by John Beck)
getline.c
When an error, signal, or other abnormal event aborted
gl_get_line(), the cleanup code that restored the
terminal to a sane state, also overwrote the value of
errno that was associated with the aborting event. An
I/O error occurring in the cleanup code would have also
overwritten the value to be returned by
gl_return_status(), and thus remove any possibility of
the caller finding out what really caused gl_get_line()
to abort. I have now written a new internal function
called, gl_record_status(), which records the completion
status to be returned by gl_return_status(), and the
value to assign to errno just before gl_get_line()
returns. This is called wherever code detects conditions
that require gl_get_line() to return early. The function
ensures that once an abnormal completion status has been
recorded for return, subsequent completions statuses
aren't recorded. This ensures that the caller sees the
original cause of the abnormal return, rather than any
error that occurs during cleaning up from this before
return.
17/04/2004 mcs@astro.caltech.edu
getline.c
If an application's callback called gl_read_char() after
calling gl_normal_io(), it would inappropriately
redisplay the input line, when it called _gl_raw_io() to
temporarily switch the terminal back into raw mode.
To fix this, _gl_raw_io() now takes a new 'redisplay'
argument, which specifies whether or not to queue a
redisplay of the input line. I also created a new
gl->postpone flag, which is set by gl_normal_io(), and
cleared by _gl_raw_io() (when its redisplay argument is
true). When this flag is set, gl_flush_output() ignores
queued redisplays, as it generally should between calls
to gl_normal_io() and gl_raw_io(). Thus its effect is to
postpone redisplays while line editing is suspended.
11/04/2004 mcs@astro.caltech.edu
history.c man/misc/tecla.in
History searches can now include the globbing operators
*, ?, []. When a search prefix is found to have at least
one of these characters, then only history lines that
completely match that pattern are returned.
11/04/2004 mcs@astro.caltech.edu (issue raised by Mark Coiley)
getline.c ioutil.c
There appears to be a bug in Solaris's terminal I/O.
When the terminal file descriptor is placed in
non-blocking I/O mode, and the terminal is switched from
canonical to raw mode, characters that were previously
entered in canonical I/O mode don't become available to
be read until the user types one character more. Select()
incorrectly says that there are no characters available,
and read() returns EAGAIN. This is only a problem for
gl_get_line() when gl_get_line() is in non-blocking
server I/O mode, so most users won't have experienced any
problems with this.
The only way that I have found to get read() to return
the characters, without the user first having to type
another character, is to turn off non-blocking I/O before
calling read(). Select() still claims that there are no
characters available to be read, but read happily returns
them anyway. Fortunately, one can perform non-blocking
terminal reads without setting the non-blocking I/O flag
of the file descriptor, simply by setting the VTIME
terminal attribute to zero (which I already was
doing). Thus, when in non-blocking server I/O, I now turn
off the non-blocking I/O flag, attempt to read one
character and only if this fails, do I then call the
select() based event handler to implement any configured
non-zero timeout, before attempting the read again. Of
course the non-blocking I/O flag is still needed for
writing, so I only turn it off temporarily while reading.
25/03/2004 mcs@astro.caltech.edu (bug reported by Gregory Harris)
Makefile.in
It appears that when in February, I patched Makefile.in
to add abolute paths to the install-sh shell-script,
I accidentally replaced install-sh with install.sh. I
corrected the name in the Makefile.
25/03/2004 Gregory Harris (documented here by mcs)
configure.in configure
Greg added the configuration parameters needed to build
the shared version of the libtecla library under FreeBSD.
25/03/2004 mcs@astro.caltech.edu
getline.c libtecla.h libtecla.map man/func/gl_get_line.in
man/func/gl_read_char.in
I wrote a public function called gl_read_char(). Unlike
gl_query_char(), this function neither prompts the user
for input, nor displays the character that was entered.
In fact it doesn't write anything to the terminal, and
takes pains not to disturb any incompletely entered
input line, and can safely be called from application
callback functions.
21/03/2004 mcs@astro.caltech.edu
getline.c libtecla.h libtecla.map man/func/gl_get_line.in
man/func/gl_query_char.in
I wrote a public function called gl_query_char(), which
prompts the user and awaits a single-character reply,
without the user having to hit return.
23/02/2004 mcs@astro.caltech.edu (bug reported by Gregory Harris)
configure.in configure getline.c enhance.c demo3.c
The configure script now checks for the sys/select.h
header file, and arranges for a C macro called
HAVE_SYS_SELECT_H to be set if it exists. Thus the files
that use select() now use this macro to conditionally
include sys/select.h where available. Apparently this
header is required under FreeBSD 5.1.
23/02/2004 mcs@astro.caltech.edu
getline.c libtecla.h man/func/gl_get_line.in
I wrote two new public functions, gl_append_history() and
gl_automatic_history(). Together these allow the
application to take over the responsibility of adding
lines to the history list from gl_get_line(). I then
documented their functionality in the gl_get_line man
page.
Version 1.6.0
I incremented the minor version number of the library, to
comply with the requirement to do so when additions are
made to the public interface. See libtecla.map for
details.
libtecla.map
I added a new 1.6.0 group for the new minor version, and
added the above pair of functions to it.
15/02/2004 mcs@astro.caltech.edu (fixes a bug reported by Satya Sahoo)
history.c
Calling gl_load_history() multiple times, eventually led
to a segmentation fault. This was due to the head of the
list of unused history string segments not getting
reset when the history buffer was cleared. While
debugging this problem I also noticed that the history
resizing function was way too complicated to verify, so
after fixing the above bug, I heavily simplified the
history resizing function, trading off a small reduction
in memory efficiency, for greatly improved clarity, and
thus made it much more verifiable and maintainable.
14/02/2004 mcs@astro.caltech.edu (fixes a bug reported by Tim Burress).
getline.c
If gl_change_terminal() was first used to tell
gl_get_line to read input from a file, then called later
to tell it to read subsequent input from a terminal, no
prompt would be displayed for the first line of
interactive input. The problem was that on reaching the
end of the input file, gl_get_line() should have called
gl_abandon_line(), to tell the next call to gl_get_line()
to start inputting a new line from scratch. I have added
this now.
14/02/2004 Krister Walfridsson (documented here by mcs@astro.caltech.edu)
Makefile.in
Krister noticed that I had failed to put $(srcdir)/ in front
of some invokations of install.sh. I have remedied this.
config.guess config.sub
I hadn't updated these for a long time, so apparently they
didn't recognise the BSD system that Krister was using.
I have now updated them to the versions that come with
autoconf-2.59.
22/01/2004 mcs@astro.caltech.edu
keytab.c
When parsing key-binding specifications, backslash escaped
characters following ^ characters were not being expanded.
Thus ^\\ got interpretted as a control-\ character followed
by a \ character, rather than simply as a control-\
character.
12/01/2004 mcs@astro.caltech.edu
cplfile.c cplmatch.c demo2.c demo3.c demo.c direader.c
expand.c getline.c history.c homedir.c pathutil.c pcache.c
configure.in configure INSTALL
The configuration script now takes a
"--without-file-system" argument. This is primarily for
intended for embedded systems that either don't have
filesystems, or where the file-system code in libtecla is
unwanted bloat. It sets the WITHOUT_FILE_SYSTEM
macro. This removes all code related to filesystem
access, including the entire public file-expansion,
file-completion and path-lookup facilities. Note that the
general word completion facility is still included, but
without the normally bundled file completion
callback. Actually the callback is still there, but it
reports no completions, regardless of what string you ask
it to complete.
This option is described in the INSTALL document.
12/01/2004 mcs@astro.caltech.edu
getline.c configure.in configure INSTALL
The configuration script now takes a
"--without-file-actions" argument. This allows an
application author/installer to prevent users of
gl_get_line() from accessing the filesystem from the
builtin actions of gl_get_line(). It defines a macro
called HIDE_FILE_SYSTEM. This causes the
"expand-filename", "read-from-file", "read-init-files",
and "list-glob" action functions to be completely
removed. It also changes the default behavior of actions
such as "complete-word" and "list-or-eof" to show no
completions, instead of the normal default of showing
filename completions.
This option is described in the INSTALL document.
11/01/2004 mcs@astro.caltech.edu
getline.c man/func/gl_get_line.in
In case an application's customized completion handler
needs to write to the terminal for some unforseen reason,
there needs to be a way for the it to cleanly suspend raw
line editing, before writing to the terminal, and the
caller then needs to be aware that it may need to
resurrect the input line when the callback returns. I
have now arranged that the completion callback functions
can call the gl_normal_io() function for this purpose,
and documented this in the gl_get_line() man page.
11/01/2004 mcs@astro.caltech.edu (In response to a bug report by Satya Sahoo)
getline.c
The gl_configure_getline() function makes a malloc'd copy
of the names of the configuration files that it is asked
to read. Before the bug fix, if the application made one
or more calls to this function, the memory allocated by
the final call that it made before calling del_GetLine(),
wasn't being freed. Note that memory allocated in all but
the final call was being correctly freed, so the maximum
extent of the memory leak was the length of the file
name(s) passed in the final call to
gl_configure_getline(), and an application that didn't
call gl_configure_getline() didn't suffer any leak.
20/12/2003 mcs@astro.caltech.edu
history.c
Ellen tested the history fix that I reported below, and
pointed out that it still had a problem. This turned out
to be because getline.c was making some incorrect
assumptions about the new behavior of history.c. This
problem and the previous one both revolved around how
search prefixes were stored and discarded, so I have now
re-written this part of the code. Previously the search
prefix was retained by looking for a line with that
prefix, and keeping a pointer to that line. This saved
memory, compared to storing a separate copy of the
prefix, but it led to all kinds of hairy
interdependencies, so I have now changed the code to keep
a separate copy of search prefixes. To keep the memory
requirements constant, the search prefix is stored in the
history buffer, like normal history lines, but not
referenced by the time-ordered history list. The prefix
can now be kept around indefinitely, until a new search
prefix is specified, regardless of changes to the
archived lines in the history buffer. This is actually
necessary to make the vi-mode re-search actions work
correctly. In particular, I no longer discard the search
prefix whenever a history search session ends. Also,
rather than have getline.c keep its own record of when a
history session is in progress, it now consults
history.c, so that failed assumptions can't cause the
kind of discrepancy that occurred before. For this to
work, getline.c now explicitly tells history.c to cancel
search sessions whenever it executes any non-history
action.
14/12/2003 mcs@astro.caltech.edu (bug reported by Ellen Oschmann)
history.c
If one searched backwards for a prefix, then returned to
the original line, changed that line, then started
another backwards prefix search, getline incorrectly
discarded the new search prefix in the process of
throwing away its cached copy of the previous pre-search
input line. In other words getline was belatedly
cancelling a previous search, after a new search had
already partially begun, and thus messed up the new
search. The obvious fix was to arrange for the current
search to be cancelled whenever the history pointer
returns to its starting point, rather than waiting for
the next search to begin from there.
14/12/2003 mcs@astro.caltech.edu
history.c
_glh_recall_line() was returning the last line in the
history buffer instead of the line requested by the
caller. This only affected the obscure "repeat-history"
action-function, which probably isn't used by anybody.
09/12/2003 Version 1.5.0 released.
28/09/2003 mcs@astro.caltech.edu
homedir.c
When the home directory of the login user is requested,
see if the HOME environment variable exists, and if so
return its value, rather than looking up the user's home
directory in the password file. This seems to be the
convention adopted by other unix programs that perform
tilde expansion, and it works around a strange problem,
where a third-party libtecla program, statically compiled
under an old version of RedHat, unexpectedly complained
that getpwd() returned an error when the program was run
under RedHat 9.
01/09/2003 mcs@astro.caltech.edu
getline.c libtecla.h libtecla.map man/func/gl_get_line.in
man/func/gl_register_action.in.
It is now possible for an application to register
external functions as action functions. These actions are
initially bound to specified key-sequences, but if they
are registered before the user's configuration file is
loaded, they can also be re-bound by the user to
different key-sequences. The function used to register a
new action, is called gl_register_action(). Action
functions are passed a readonly copy of the input line
and the cursor position. They can display text to the
terminal, or perform other operations on the application
environment. Currently, they can't edit the input line or
move the cursor. This will require the future addition of
functions to queue the invokation of the built-in action
functions.
26/08/2003 mcs@astro.caltech.edu
getline.c
I modified gl_update_buffer() to ensure that the cursor
stays within the input line after external line
modifications, and to queue a redisplay of the
potentially modified input line.
21/07/2003 mcs@astro.caltech.edu
configure.in configure Makefile.in Makefile.stub INSTALL
By specifying --without-man-pages or --with-man-pages=no
as command-line arguments to the configure script, it is
now possible to have the configure script skip the
man-page preprocessing step, and arrange for the man-page
installation targets in the Makefile to do nothing. This
option is designed for people who embed libtecla within
other packages. It is also used by Makefile.stub when
the distclean target is specified.
21/07/2003 mcs@astro.caltech.edu
configure.in configure
The previous workaround for recent versions of gcc
placing /usr/local/include at the start of the system
inlcude-file search path, broke something else. The fix
placed /usr/include before gcc's include area, which
meant that gcc's modified version of stdarg.h was being
ignored in deference to the version in /usr/include. I
have changed the fix to have gcc report the search path,
then have awk add options to CFLAGS to reorder this path,
plaing /usr/local/include at the end.
Also, under Solaris 9, including term.h without first
including curses.h results in complaints about undefined
symbols, such as bool. As a result the configure script's
test for term.h was failing. I have now modified it to
include curses.h in the test code that it uses to check
for term.h. In the process I also improved the tests for
curses.h and term.h to prevent an ncurses version of
term.h from being used with the system-default version of
curses.h.
29/06/2003 mcs@astro.caltech.edu
Makefile.in direader.c homedir.c
On some systems (eg. linux) the _POSIX_C_SOURCE
feature-test macro is set by system headers, rather than
being an option set by a project's Makefile at
compilation time. In software, such as tecla, where the
definition of this macro is used as an indication of
whether to use the non-reentrant or reentrant versions of
system functions, this means that the reentrant functions
are always used, regardless of whether this macro is set
or not by the project Makefile. Thus, on such systems the
reentrant and non-reentrant versions of the tecla library
are essentially identical. This has a couple of
drawbacks. First, since thread-safe functions for
traversing the password file don't exist, the supposedly
non-reentrant version of the tecla library can't support
ambiguous tab-completion of usernames in ~username/
constructions. Secondly, on some systems the use of
reentrant system functions dictates the use of a shared
library that isn't needed for the non-reentrant
functions, thus making it more difficult to distribute
binary versions of the library.
To remedy this situation I have modified the DEFINES_R
variable in Makefile.in to arrange for the compiler to
define a C macro called PREFER_REENTRANT when it is
compiling the reentrant version of the tecla library.
This macro is now used in the source code to determine
when to require reentrant code. Whithin the source code,
wherever a potentially non-reentrant interface is used,
the existance of both this macro and a suitably valued
_POSIX_C_SOURCE macro, are tested for to see if a
reentrant alternative to the problem code should be used.
22/06/2003 mcs@astro.caltech.edu
getline.c
I changed the way that redisplays are requested and
performed. Redisplays are now queued by calling
gl_queue_redisplay(), and subsequently performed by
gl_flush_output(), when the queue of already pending
output has been completely dispatched. This was necessary
to prevent event handlers from filling up the output
queue with redisplays, and it also simplifies a number of
things. In the process I removed the gl_queue_display()
function. I also wrote a gl_line_erased() function, which
is now called by all functions that erase the input
line. I also split the gl_abandon_line() function into
public and private callable parts, and used the private
version internally to arrange to discard the input line
after errors.
The raw_mode flag was not being initialized by new_GetLine().
It is now initialized to zero.
I removed the zapline flag, since using the endline flag to
communicate the desire to terminate the line, did the same
thing.
gl_terminal_move_cursor() now does nothing when the input
line isn't displayed.
18/03/2003 mcs@astro.caltech.edu
getline.c
Fixed bug which was causing newlines not to be output
at the end of each newly entered line. I was
interpreting the gl->endline flag in conflicting ways in
two places. To fix this I have created a gl->displayed
flag. This flags whether an input line is currently
displayed.
17/03/2003 mcs@astro.caltech.edu
getline.c libtecla.h man/func/gl_get_line.in
man/func/gl_erase_terminal.in libtecla.map
I added a new function that programs can call to clear
the terminal between calls to gl_get_line().
11/03/2003 mcs@astro.caltech.edu
configure.in configure
Under linux when _POSIX_C_SOURCE is defined, getpwent()
and associated functions become undefined, because
_SVID_SOURCE and _BSD_SOURCE become undefined. Adding
these feature macros back to CFLAGS resolves this.
06/03/2003 mcs@astro.caltech.edu
getline.c libtecla.map man/func/gl_get_line.in
Following the lead of Edward Chien, I wrote a function
called gl_bind_keyseq(), which binds a specified
key-sequence to a given action, or unbinds the
key-sequence.
24/02/2003 mcs@astro.caltech.edu
getline.c libtecla.map man/func/cpl_complete_word.in
I implemented a simple function called
cpl_recall_matches(). This recalls the return value of
the last call to cpl_complete_word().
19/01/2003 mcs@astro.caltech.edu
getline.c
The documented signal handling, fd event-handling,
inactivity timeout handling, and server-mode non-blocking
I/O features are now implemented for non-interactive
input streams, such as pipes and files.
19/01/2003 mcs@astro.caltech.edu
getline.c libtecla.h man/func/gl_get_line.in demo3.c
I added a new return status enumerator to report
when an end-of-file condition causes gl_get_line()
to return NULL.
13/01/2003 mcs@astro.caltech.edu
history.c
I rewrote the history facility. The previous
circular buffer implementation was a nightmare to change,
and it couldn't efficiently support certain newly
requested features. The new implementation stores history
lines in linked lists of fixed sized string segments,
taken from the buffer, with each line being reference
counted and recorded in a hash table. If the user enters
a line multiple times, only one copy of the line is now
stored. Not only does this make better use of the
available buffer space, but it also makes it easy to
ensure that a line whose prefix matches the current
search prefix, isn't returned more than once in sequence,
since we can simply see if the latest search result has
the same hash-table pointer as the previous one, rather
than having to compare strings. Another plus is that due
to the use of linked lists of nodes of fixed size line
segments, there is no longer any need to continually
shuffle the contents of the buffer in order to defragment
it. As far as the user is concerned, the visible
differences are as follows:
1. If the user enters a given line multiple times in a
row, each one will be recorded in the history list,
and will thus be listed by gl_show_history(), and
saved in the history file. Previously only one line
was recorded when consecutive duplicates were entered.
This was a kludge to prevent history recall from
recalling the same line multiple times in a row. This
only achieved the desired result when not recalling by
prefix.
2. Not only simple recall, but prefix-based history line
recalls now don't return the same line multiple times
in a row. As mentioned in (1) above, previously this
only worked when performing a simple recall, without a
search prefix.
28/12/2002 mcs@astro.caltech.edu
getline.c
The one-line function, gl_buff_curpos_to_term_curpos()
was only being used by gl_place_cursor(), so I inlined it
in that function, and removed it.
28/12/2002 mcs@astro.caltech.edu
getline.c
gl_suspend_process() was calling the application-level
gl_normal_io() and gl_raw_io() functions, where it should
have been calling the internal versions _gl_normal_io()
and _gl_raw_io().
Also gl_handle_signal() was masking and unmasking just
the signals of the first element of the gl[] array
argument. It now masks and unmasks all trappable signals.
28/12/2002 mcs@astro.caltech.edu
getline.c
Now that the number of terminal characters used to
display the current input line, is recorded, the relative
line on which the last character of the input line
resides can be determined without having to call
gl_buff_curpos_to_term_curpos(). This is now used by
gl_normal_io() via gl_start_newline(), so there is now no
need for gl_buff_curpos_to_term_curpos() to be
async-signal safe. I have thus removed the annoying
gl->cwidth[] array, and gl_buff_curpos_to_term_curpos()
now calls gl_width_of_char() directly again. There is
also now no need for the gl_line_of_char_start() and
gl_line_of_char_end() functions, so I have removed them.
28/12/2002 mcs@astro.caltech.edu
getline.c
Unfortunately it turns out that the terminfo/termcap
control sequence which is defined to delete everything
from the current position to the end of the terminal, is
only defined to work when at the start of a terminal
line. In gnome terminals in RedHat 8.0, if it is used
within a terminal line, it erases the whole terminal
line, rather than just what follows the cursor. Thus to
portably truncate the displayed input line it is
necessary to first use the control sequence which deletes
from the cursor position to the end of the line, then if
there are more terminal lines, move to the start of the
next line, and use the delete to end-of-terminal control
sequence, then restore the cursor position. This requires
that one know how many physical terminal lines are used
by the current input line, so I now keep a record of the
number of characters so far displayed to the terminal
following the start of the prompt, and the new
gl_truncate_display() function uses this information to
truncate the displayed input line from the current cursor
position.
28/12/2002 mcs@astro.caltech.edu
getline.c
gl_start_newline() now moves to an empty line following
the input line, rather than just to the next line. It
also arranges for the input line to be redisplayed before
editing resumes. A major user of this is gl_print_info(),
which now need not be followed by an explicit call to
gl_redisplay(), since the terminal input loop in
gl_get_input_line() ensures that gl_redisplay() is called
after any action function that asserts gl->redisplay.
Also, all functions that erase the displayed input line
can now call the gl_erase_line() function, which is
designed to work correctly even when a terminal resize
invalidates the horizontal cursor position. Finally, the
new gl_queue_display() function is now used by functions
that need to arrange for the input line to be displayed
from scratch after the displayed line has been erased or
invalidated by other text being written to the terminal.
All of these changes are aimed at reducing the number of
places that directly modify gl->term_curpos and
gl->redisplay.
22/12/2002 Markus Gyger (logged here by mcs)
Makefile.in update_html
In places where echo and sed were being used to extract
the base names of files, Markus substituted the basename
command. He also replaced explicit cp and chmod commands
with invokations of the install-sh script.
configure.in
Use $target_os and $target_cpu, where appropriate,
instead of $target.
configure.in
The Solaris man function and library man pages should
be in sections 3lib and 3tecla respectively, only in
Solaris version 2.8 and above.
configure.in
Markus provided values for the man page configuration
variables for HPUX.
man/*/*.in
I had missed parameterizing man page section numbers in
the man page titles, Markus corrected this.
man/func/libtecla_version.in
Fixed incorrect section number in the link to the
libtecla man page.
homedir.c
When compiled to be reentrant, although one can't use the
non-reentrant getpwent() function to scan the password
file for username completions, one can at least see if
the prefix being completed is a valid username, and if
the username of the current user minimally matches the
prefix, and if so list them. I simplified Markus'
modification by adding a prefix argument to the
_hd_scan_user_home_dirs() function, and redefining the
function description accordingly, such that now it
reports only those password file entries who's usernames
minimally match the specified prefix. Without this, it
would have been necessary to peak inside the private data
argument passed in by cf_complete_username().
Markus also provided code which under Solaris uses the
non-reentrant interfaces if the reentrant version of the
library isn't linked with the threads library.
19/12/2002 mcs@astro.caltech.edu
Makefile.in
Markus pointed out that LDFLAGS was being picked up by
the configure script, but not then being interpolated
into te Makefile. I have thus added the necessary
assignment to Makefile.in and arranged for the value of
LDFLAGS to be passed on to recursive make's. I also did
the same for CPPFLAGS, which had also been omitted.
18/12/2002 mcs@astro.caltech.edu
man/* man/*/* configure.in configure Makefile.in
update_html
It turns out that the assignment of man page sections to
topics differs somewhat from system to system, so this is
another thing that needs to be configured by the main
configuration script, rather than being hardwired. All
man pages have now been moved into suitably named
topic-specific sub-directories of the top-level man
directory, and instead of having a numeric suffix, now
have the .in suffix, since they are now preprocessed by
the configure script, in the same fashion as Makefile.in.
Whithin these *.in versions of the man pages, and within
Makefile.in, the installation subdirectory (eg. man1) and
the file-name suffix (eg. 1), are written using
configuration macros, so that they get expanded to the
appropriate tokens when the configure script is run. In
principle, the man pages could also take advantage of
other configuration macros, such as the one which expands
to the library installation directory, to include full
path names to installed files in the documentation, so in
the future this feature could have more uses than just
that of parameterizing man page sections.
18/12/2002 mcs@astro.caltech.edu
man3 man3/* Makefile.in html/index.html update_html
Markus suggested splitting the gl_get_line(3) man page
into user and developer sections, and also pointed out
that the enhance man page should be in section 1, not
section 3. I have thus created a top-level man
directory in which to place the various sections, and
moved the man3 directory into it. The enhance.3 man page
is now in man/man1/enhance.1. I have extracted all
user-oriented sections from the gl_get_line(3) man page
and placed them in a new man7/tecla.7 man page.
18/12/2002 mcs@astro.caltech.edu
getline.c
Terminal resizing was broken in normal mode, due to
me forcing the terminal cursor position to zero in the
wrong place in gl_check_caught_signal().
14/12/2002 Markus Gyger (logged here by mcs)
configure.in configure
Under Solaris, recent versions of gcc search
/usr/local/include for header files before the system
directories. This caused a problem if ncurses was
installed under Solaris, since the termcap.h include file
in /usr/local/include ended up being used at compile
time, whereas the system default version of the curses
library was used at link time. Since the two libraries
declare tputs() differently, this evoked a complaint from
gcc. Markus came up with a way to force Gnu cpp to move
/usr/local/include to the end of the system-include-file
search path, where it belongs.
13/12/2002 mcs@astro.caltech.edu
man3/gl_io_mode.3
I rewrote the man page which documents the new non-blocking
server I/O mode.
12/12/2002 mcs@astro.caltech.edu
demo3.c
I wrote a new version of demo3.c, using signal handlers
that call gl_handle_signal() and gl_abandon_line(), where
previously in this demo, these functions were called from
the application code.
05/12/2002 mcs@astro.caltech.edu
getline.c
gl_normal_io(), gl_raw_io() and gl_handle_signal() and
gl_abandon_line() are now signal safe, provided that
signal handlers that call them are installed with sa_mask's
that block all other signals who's handlers call them.
This is the case if gl_tty_signals() is used to install
signal handlers that call any of these functions.
A major stumbling block that had to be overcome was that
gl_displayed_char_width() calls isprint(), which can't
safely be called from a signal handler (eg. under linux,
the is*() functions all use thread-specific data
facilities to support per-thread locales, and the
thread-specific data facilities aren't signal safe). To
work around this, all functions that modify the
input-line buffer, now do so via accessor functions which
also maintain a parallel array of character widths, for
use by gl_buff_curpos_to_term_curpos() in place of
gl_displayed_char_width(). Other minor problems were the
need to avoid tputs(), who's signal safety isn't defined.
05/12/2002 Eric Norum (logged here by mcs@astro.caltech.edu)
configure.in
Eric provided the configuration information needed
to build shared libraries under Darwin (Max OS X).
05/12/2002 Richard Mlynarik (logged here by mcs@astro.caltech.edu)
configure.in
AC_PROG_RANLIB gets the wrong version of ranlib when
cross compiling, so has now been replaced by an
invokation of AC_CHECK_TOOL. In addition, AC_CHECK_TOOL
is also now used to find an appropriate version of LD.
05/12/2002 mcs@astro.caltech.edu (based on patch by Pankaj Rathore)
getline.c libtecla.h libtecla.map man3/gl_get_line.3
The new gl_set_term_size() function provides a way
to tell gl_get_line() about changes in the size of
the terminal in cases where the values returned by
ioctl(TIOCGWINSZ) isn't correct.
05/12/2002 mcs@astro.caltech.edu
getline.c
Rather than calling sprintf() to see how much space would
be needed to print a given number in octal, I wrote a
gl_octal_width() function, for use by
gl_displayed_char_width(). This makes the latter
function async signal safe.
05/12/2002 mcs@astro.caltech.edu
chrqueue.c
Whenever the buffer is exhausted, and getting a new
buffer node would require a call to malloc(), attempt
to flush the buffer to the terminal. In blocking I/O
mode this means that the buffer never grows. In
non-blocking I/O mode, it just helps keep the buffer
size down.
05/12/2002 mcs@astro.caltech.edu
freelist.h freelist.c
The new _idle_FreeListNodes() function queries the
number of nodes in the freelist which aren't currently
in use.
05/12/2002 mcs@astro.caltech.edu
Makefile.stub
This now accepts all of the targets that the configured
makefile does, and after configuring the latter makefile,
it invokes it with the same options.
03/12/2002 mcs@astro.caltech.edu
mans3/gl_io_mode.3
I completed the man page for all of the new functions
related to non-blocking I/O.
01/12/2002 mcs@astro.caltech.edu
man3/gl_get_line.3
I wrote a long section on reliable signal handling,
explaining how gl_get_line() does this, how to make
use of this in a program, and how to handle signals
reliably when faced with other blocking functions.
This basically documents what I have learnt about
signal handling while working on this library.
01/12/2002 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
In non-blocking server mode, the gl_replace_prompt()
function can now be used between calls to gl_get_line()
if the application wants to change the prompt of the
line that is being edited.
01/12/2002 mcs@astro.caltech.edu
man3/gl_get_line.3
I documented the new gl_return_status() and
gl_error_message() functions.
01/12/2002 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
Added SIGPOLL and SIGXFSZ to the list of signals that
are trapped by default. These are process termination
signals, so the terminal needs to be restored to a
usable state before they terminate the process.
27/11/2002 mcs@astro.caltech.edu
getline.c libtecla.h
Completed the essential changes needed to support
non-blocking server-I/O mode.
The new gl_io_mode() function allows one to switch to
and from non-blocking server-I/O mode.
The new gl_raw_io() function is used in non-blocking
server-I/O mode to switch the terminal into non-blocking
raw I/O mode.
The new gl_normal_io() function is used in non-blocking
server-I/O mode to switch the restore the terminal to
a normal, blocking state. This is used to suspend line
input before suspending the process or writing messages
to the terminal.
The new gl_tty_signals() function installs specified
signals handlers for all signals that suspend, terminate
or resume processes, and also for signals that indicate
that the terminal has been resized. This not only saves
the application from having to keep its own ifdef'd list
of such signals, of which there are many, but it also
makes sure that these signal handlers are registered
correctly. This includes using the sa_mask member of each
sigaction structure to ensure that only one of these
handlers runs at a time. This is essential to avoid the
signal handlers all trying to simultaneously modify
shared global data.
The new gl_handle_signal() function is provided for
responding (from application level) to signals caught by
the application. It handles process suspension, process
termination and terminal resize signals.
The new gl_pending_io() function tells the application
what direction of I/O gl_get_line() is currently waiting
for.
In non-blocking server I/O mode, the new
gl_abandon_line() function can be called between calls to
gl_get_line() to discard an input line and force the next
call to gl_get_line() to start the input of a new line.
Also, in non-blocking server-I/O gl_get_line() doesn't
attempt to do anything but return when one of the signals
that it is configured to catch is caught. This is
necessary because when in this mode, the application is
required to handle these signals when gl_get_line() is
running, and the default configuration of most of these
signals in gl_get_line() is to restore the terminal then
call the application signal handlers. This would be a
case of too many cooks spoiling the broth, so in this
mode, gl_get_line() always defers to the application's
signal handlers.
26/11/2002 mcs@astro.caltech.edu
getline.c libtecla.h
I implemented a couple of new functions to support
reliable signal handling, as now documented
(see above) in the gl_get_line(3) man page.
The new gl_catch_blocked() function tells gl_get_line()
to unblock all configured signals around calls to
long-running functions, not only those that aren't
blocked when gl_get_line() is called. This allows
the caller to implement reliable signal handling,
since the unblocking is only done from within code
protected by sigsetjmp(), which avoids race conditions.
The new gl_list_signals() function fills a provided
sigset_t with the set of signals that gl_get_line() is
currently configured to catch. This allows callers to
block said signals, such that they are only unblocked by
gl_get_line() when it is waiting for I/O. When used in
conjunction with the gl_catch_blocked() function, this
removes the potential for race conditions.
Also, when gl_get_line() installs its signal handler,
it uses the sa_mask member of the sigaction structure
to ensure that only one instance of this signal handler
will ever be executing at a time.
25/11/2002 mcs@astro.caltech.edu (bug reported by Pankaj Rathore)
getline.c
When any history recall action was invoked when the
input line buffer was full, an error message would be
displayed complaining about the length of the string
in the line input buffer being inconsistent with the
specified allocated size. This was because instead of
sending the allocated size of the input line, I was
sending the length excluding the element that is
reserved for the '\0' terminator. Sending it the
correct size corrected the problem.
24/11/2002 mcs@astro.caltech.edu
getline.c
All public functions which take GetLine objects as
arguments now block signals on entry and restore the
signal mask on return. This was an attempt to make it
safe to call getline functions from signal handlers, but
the fact is that the functions that I really wanted this
to apply to, potentially call malloc(), so this currently
isn't the case.
23/11/2002 mcs@astro.caltech.edu
getline.c libtecla.h
The new gl_return_status() function returns an enumerated
return status which can be used to query what caused
gl_get_line() to return.
22/11/2002 mcs@astro.caltech.edu
Most existing .c and .h files, plus errmsg.c errmsg.h
Makefile.rules
Until now, many library functions would report error
messages to stderr. This isn't appropriate for library
functions, so in place of this behavior, error messages
are now recorded in internal ErrMsg objects, and passed
between modules via new module-specific error querying
functions. In addition, errno is now set appropriately.
Thus when gl_get_line() and related functions return an
error, strerror() can be used to look up system errors,
and gl_error_message() can be used to recover a higher level
error message. Note that error messages that are
responses to user actions continue to be reported to the
terminal, as before.
21/11/2002 mcs@astro.caltech.edu
getline.c keytab.h keytab.c Makefile.rules
I wrote a new version of _kt_lookup_binding() that didn't
require the caller to have access to the innards of a
KeyTab object. This then enabled me to move the definition
of KeyTab objects into keytab.c and make the typedef in
keytab.h opaque. Many nested includes were also moved from
keytab.h into keytab.c.
05/11/2002 mcs@astro.caltech.edu
getline.c libtecla.map libtecla.h demo3.c
I split the old gl_resize_terminal() function into
two parts, gl_query_size() and gl_update_size(), with
the latter calling the former to get the new terminal
size.
05/11/2002 mcs@astro.caltech.edu
getline.c
I fixed a long time bug in the terminal resizing code.
When the cursor wasn't on the last terminal line of the
input line, the resizing code would redisplay the
the line one or more lines above where it should be
restored. This was due to an error in the calculation of
the number of lines above the cursor position.
04/11/2002 mcs@astro.caltech.edu
demo.c demo2.c demo3.c
I used the new gl_display_text() function to display
introductory text at the startup of each of the demo
programs. The text is enclosed within a box of asterixes,
drawn dynamically to fit within the confines of the
available terminal width.
04/11/2002 mcs@astro.caltech.edu
libtecla.h getline.c ioutil.c ioutil.h Makefile.rules
libtecla.map man3/gl_get_line.3 man3/gl_display_text.3
Needing a way to display introductory text intelligently
in the demo programs, I wrote and documented the
gl_display_text() function. This justifies arbitrary
length text within the bounds of the terminal width,
with or without optional indentation, prefixes and
suffixes.
03/11/2002 mcs@astro.caltech.edu
demo3.c Makefile.rules
I wrote a new demonstration program. This program acts
exactly like the main demonstration program, except that
it uses an external event loop instead of using the
gl_get_line() internal event loop. This is thus an example
of the new non-blocking server I/O facility.
02/11/2002 mcs@astro.caltech.edu
getline.c keytab.c keytab.h libtecla.h man3/gl_get_line.3
man3/gl_completion_action.3
I added the ability to register additional word
completion actions via the new function
gl_completion_action(). All action functions now take a
new (void *data) argument, which is stored with the
function in the symbol table of actions. The new
gl_completion_action() function uses this feature to
record dynamically allocated objects containing the
specified completion function and callback data along
with either the gl_complete_word() action function, or
the gl_list_completions() action function. These two
actions continue to use the builtin completion functions
when their data pointer is NULL.
20/10/2002 mcs@astro.caltech.edu
The following are changes merged from the non-blocking
gl_get_line() development branch.
getline.c
I wrote a gl_start_newline() function, to replace all of
the explicit calls to output \r\n to stdout.
Informational messages are now written to the terminal
using a new variadic function called gl_print_info().
This starts a newline, writes string arguments until a
special argument, GL_END_INFO, is seen, then starts
another newline.
Changed _output_ to _print_ in the following function
names gl_output_control_sequence(), gl_output_char(),
gl_output_string() and gl_output_raw_string().
gl_print_raw_string() now has a length argument, so that
strings that aren't terminated with '\0' can be printed.
The display of the initial contents of a new line to be
edited has been moved into a new function called
gl_present_line().
The gl_get_input_line() function now takes the prompt
string as an argument so that gl_replace_prompt() can be
called from within this function instead of from
gl_get_line().
Keyboard input is now buffered in a persistent buffer in
the parent GetLine object. gl_read_character() checks
this for unprocessed characters in preference to calling
gl_read_terminal() to append characters to it. A new
function, gl_discard_chars(), removes processed
characters from this buffer. This change is in
preparation for a non-blocking version of gl_get_line(),
where partially input key-sequences must be stored
between calls to gl_get_line().
getline.c getline.h history.c history.h cplmatch.c \
cplmatch.h expand.c expand.h
All terminal output from gl_get_line() is now routed
through a GL_WRITE_FN() callback function called
gl_write_fn. Internal functions in cplmatch.c,
expand.c and history.c have been created which take
such callbacks to write output. These are used both
by functions in getline.c, to display file completions,
expansions, history etc, and as the internals of existing
public functions in these files that print to stdio
streams. In the latter case an internal stdio
GL_WRITE_FN() callback is substituted, so that the
functions behave as before.
getline.c chrqueue.c chrqueue.h
The gl_write_fn() callback used by gl_get_line() now
writes to a queue, implemented in chrqueue.c. This queue
is implemented as a list of blocks of buffer segments,
the number of which shrink and grow as
needed. The contents of the queue are flushed to the
terminal via another GL_WRITE_FN() callback passed to the
queue object. Currently gl_get_line() passes an internal
function assigned to gl->flush_fn, called
gl_flush_terminal(), which writes the contents of the
queue to the terminal, and knows how to handle both
blocking and non-blocking I/O. The output queue is
designed to be flushed to the terminal incrementally, and
thereby also facilitates non-blocking I/O.
getline.c getline.h
gl_get_line() now reads all input via the GL_READ_FN()
callback, assigned to gl->read_fn. Currently this is
set to an internal function called gl_read_terminal(),
which knows how to handle both blocking and
non-blocking I/O.
getline.c libtecla.h
The new gl_set_nonblocking() function can be used to
enable or disable non-blocking I/O. The default is still
blocking I/O. In non-blocking mode, the terminal is told
not to wait when either reading or writing would block.
gl_get_line() then returns, with a return value of NULL,
but with the terminal left in raw mode, so that the
caller's event loop can detect key presses. The caller
should call gl_return_status() to check whether the NULL
return value was due to an error, lack of input, or
inability to write to the terminal without waiting. If
either reading or writing was said to have blocked, the
user then should check for I/O readiness in the specified
direction before calling gl_get_line() again to
incrementally build up the input line.
05/08/2002 mcs@astro.caltech.edu
man3/gl_get_line.3 man3/gl_inactivity_timeout.3
I documented the new gl_inactivity_timeout() function.
08/07/2002 mcs@astro.caltech.edu
libtecla.h getline.c libtecla.map
I added a new gl_inactivity_timeout() function. On
systems that have the select system call, this provides
the option of registering a function that is then called
whenever no I/O activity has been seen for more than a
specified period of time. Like the gl_watch_fd()
facility, timeout callbacks return a code which tells
gl_get_line() how to proceed after the timeout has been
handled.
04/07/2002 mcs@astro.caltech.edu (based on a bug report from Michael MacFaden)
getline.c
The internal event handler wasn't responding to write
events on client file descriptors, due to a typo which
resulted in read events being checked for twice, and
writes not checked for at all.
pathutil.c
The amount of space to allocate for pathnames is supposed
to come from PATH_MAX in limits.h, but I had neglected to
include limits.h. This went unnoticed because on most
systems the equivalent number is deduced by calling
pathconf(). Apparently under NetBSD this function doesn't
work correctly over NFS mounts.
30/05/2002 Version 1.4.1 released.
25/05/2002 mcs@astro.caltech.edu (based on suggestions by Paul Smith)
pathutil.c
Apparently, under QNX pathconf("/",_PC_PATH_MAX) returns
EINVAL. At Paul's suggestion I have modified the code to
silently substitute the existing MAX_PATHLEN_FALLBACK
value if pathconf() returns an error of any kind.
homedir.c
Under QNX, sysconf(_SC_GETPW_R_SIZE_MAX) also apparently
returns EINVAL, so as with pathconf() I modified the code
to substitute a fallback default, rather than
complaining and failing.
enhance.c
Paul told me that the inclusion of sys/termios.h was
causing compilation of enhance.c to fail under QNX. This
line is a bug. The correct thing to do is include
termios.h without a sub-directory prefix, as I was
already doing futher up in the file, so I have just
removed the errant include line.
07/05/2002 mcs@astro.caltech.edu (async development branch only)
getline.c
gl_read_character() now caches and reads unprocessed
characters from a key-press lookahead buffer. Whenever
gl_intepret_char() receives a new character which makes
an initially promising key-sequence no longer match the
prefix of any binding, it now simply discards the first
character from the key-press buffer and resets the buffer
pointer so that the next call to gl_read_character()
returns the character that followed it, from the buffer.
getline.c
The part of gl_get_input_line() which preloads, displays
and prepares to edit a new input line, has now been moved
into a function called gl_present_line().
12/02/2002 mcs@astro.caltech.edu
getline.c configure.in configure
Mac OS X doesn't have a term.h or termcap.h, but it does
define prototypes for tputs() and setupterm(), so the
default prototypes that I was including if no headers
where available, upset it. I've removed these prototypes.
I also now conditionally include whichever is found of
curses.h and ncurses/curses.h for both termcap and
terminfo (before I wasn't including curses.h when
termcap was selected).
12/02/2002 mcs@astro.caltech.edu
Updated version number to 1.4.1, ready for a micro
release.
12/02/2002 mcs@astro.caltech.edu
html/index.html
Added Mac OS X and Cygwin to the list of systems that
can compile libtecla.
12/02/2002 mcs@astro.caltech.edu
getline.c
Under Mac OS X, the tputs() callback function returns
void, instead of the int return value used by other
systems. This declaration is now used if both __MACH__
and __APPLE__ are defined. Hopefully these are the
correct system macros to check. Thanks for Stephan
Fiedler for providing information on Mac OS X.
11/02/2002 mcs@astro.caltech.edu
configure.in configure getline.c
Some systems don't have term.h, and others have it hidden
in an ncurses sub-directory of the standard system include
directory. If term.h can't be found, simply don't include
it. If it is in an ncurses sub-directory, include
ncurses/term.h instead of term.h.
04/02/2002 mcs@astro.caltech.edu
configure.in configure Makefile.in Makefile.rules
Use ranlib on systems that need it (Mac OS X). Also,
make all components of the installation directories where
needed, instead of assuming that they exist.
04/02/2002 mcs@astro.caltech.edu
getline.c
When the tab completion binding was unbound from the tab
key, hitting the tab key caused gl_get_line() to ring the
bell instead of inserting a tab character. This is
problematic when using the 'enhance' program with
Jython, since tabs are important in Python. I have
corrected this.
10/12/2001 Version 1.4.0 released.
10/12/2001 mcs@astro.caltech.edu
getline.c
If the TIOCGWINSZ ioctl doesn't work, as is the case when
running in an emacs shell, leave the size unchanged, rather
than returning a fatal error.
07/12/2001 mcs@astro.caltech.edu
configure.in configure
Now that the configure version of CFLAGS is included in
the makefile, I noticed that the optimization flags -g
and -O2 had been added. It turns out that if CFLAGS isn't
already set, the autoconf AC_PROG_CC macro initializes it
with these two optimization flags. Since this would break
backwards compatibility in embedded distributions that
already use the OPT= makefile argument, and because
turning debugging on needlessly bloats the library, I now
make sure that CFLAGS is set before calling this macro.
07/12/2001 mcs@astro.caltech.edu
enhance.c
Use argv[0] in error reports instead of using a
hardcoded macro.
07/12/2001 mcs@astro.caltech.edu
getline.c
The cut buffer wasn't being cleared after being
used as a work buffer by gl_load_history().
06/12/2001 mcs@astro.caltech.edu
configure.in configure
I removed my now redundant definition of SUN_TPUTS from
CFLAGS. I also added "-I/usr/include" to CFLAGS under
Solaris to prevent gcc from seeing conflicting versions
of system header files in /usr/local/include.
06/12/2001 Markus Gyger (logged here by mcs)
Lots of files.
Lots of corrections to misspellings and typos in the
comments.
getline.c
Markus reverted a supposed fix that I added a day or two
ago. I had incorrectly thought that in Solaris 8, Sun had
finally brought their declaration of the callback
function of tputs() into line with other systems, but it
turned out that gcc was pulling in a GNU version of
term.h from /usr/local/include, and this was what
confused me.
05/12/2001 mcs@astro.caltech.edu
Makefile.in
I added @CFLAGS@ to the CFLAGS assignment, so that
if CFLAGS is set as an environment variable when
configure is run, the corresponding make variable
includes its values in the output makefile.
05/12/2001 mcs@astro.caltech.edu
getline.c libtecla.h libtecla.map man3/gl_get_line.3
man3/gl_last_signal.3
I added a function that programs can use to find out
which signal caused gl_get_line() to return EINTR.
05/12/2001 mcs@astro.caltech.edu
getline.c
When the newline action was triggered by a printable
character, it failed to display that character. It now
does. Also, extra control codes that I had added, to
clear to the end of the display after the carriage return,
but before displaying the prompt, were confusing expect
scripts, so I have removed them. This step is now done
instead in gl_redisplay() after displaying the full input
line.
05/12/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
A user convinced me that continuing to invoke meta
keybindings for meta characters that are printable is a
bad idea, as is allowing users to ask to have setlocale()
called behind the application's back. I have thus changed
this. The setlocale configuration option has gone, and
gl_get_line() is now completely 8-bit clean, by default.
This means that if a meta character is printable, it is
treated as a literal character, rather than a potential
M-c binding. Meta bindings can still be invoked via
their Esc-c equivalents, and indeed most terminal
emulators either output such escape pairs by default when
the meta character is pressed, or can be configured to do
so. I have documented how to configure xterm to do this,
in the man page.
03/12/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
gl_get_line() by default now prints any 8-bit printable
characters that don't match keybindings. Previously
characters > 127 were only printed if preceded by the
literal-next action. Alternatively, by placing the
command literal_if_printable in the tecla configuration
file, all printable characters are treated as literal
characters, even if they are bound to action functions.
For international users of programs written by
programmers that weren't aware of the need to call
setlocale() to support alternate character sets, the
configuration file can now also contain the single-word
command "setlocale", which tells gl_get_line() to remedy
this.
27/11/2001 mcs@astro.caltech.edu
demo.c demo2.c enhance man3/gl_get_line.3
All demos and programs now call setlocale(LC_CTYPE,"").
This makes them support character sets of different
locales, where specified with the LC_CTYPE, LC_ALL, or
LANG environment variables. I also added this to the demo
in the man page, and documented its effect.
27/11/2001 mcs@astro.caltech.edu
getline.c
When displaying unsigned characters with values over
127 literally, previously it was assumed that they would
all be displayable. Now isprint() is consulted, and if it
says that a character isn't printable, the character code
is displayed in octal like \307. In non-C locales, some
characters with values > 127 are displayable, and
isprint() tells gl_get_line() which are and which aren't.
27/11/2001 mcs@astro.caltech.edu
getline.c pathutil.c history.c enhance.c demo2.c
All arguments of the ctype.h character class functions
are now cast to (int)(unsigned char). Previously they
were cast to (int), which doesn't correctly conform to
the requirements of the C standard, and could cause
problems for characters with values > 127 on systems
with signed char's.
26/11/2001 mcs@astro.caltech.edu
man3/enhance.3 man3/libtecla.3
I started writing a man page for the enhance program.
26/11/2001 mcs@astro.caltech.edu
Makefile.in Makefile.rules INSTALL
It is now possible to specify whether the demos and other
programs are to be built, by overriding the default
values of the DEMOS, PROGRAMS and PROGRAMS_R variables.
I have also documented the BINDIR variable and the
install_bin makefile target.
22/11/2001 mcs@astro.caltech.edu
getline.c libtecla.h libtecla.map man3/gl_get_line.3
man3/gl_ignore_signal.3 man3/gl_trap_signal.3
Signal handling has now been modified to be customizable.
Signals that are trapped by default can be removed from
the list of trapped signals, and signals that aren't
currently trapped, can be added to the list. Applications
can also specify the signal and terminal environments in
which an application's signal handler is invoked, and
what gl_get_line() does after the signal handler returns.
13/11/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
Added half-bright, reverse-video and blinking text to the
available prompt formatting options.
getline.c
Removed ^O from the default VT100 sgr0 capability
string. Apparently it can cause problems with some
terminal emulators, and we don't need it, since it turns
off the alternative character set mode, which we don't
use.
getline.c
gl_tigetstr() and gl_tgetstr() didn't guard against the
error returns of tigetstr() and tgetstr() respectively.
They now do.
11/11/2001 mcs@astro.caltech.edu
getline.c libtecla.h libtecla.map man3/gl_get_line.3
man3/gl_prompt_style.3
Although the default remains to display the prompt string
literally, the new gl_prompt_style() function can be used
to enable text attribute formatting directives in prompt
strings, such as underlining, bold font, and highlighting
directives.
09/11/2001 mcs@astro.caltech.edu
enhance.c Makefile.rules configure.in configure
I added a new program to the distribution that allows one
to run most third party programs with the tecla library
providing command-line editing.
08/11/2001 mcs@astro.caltech.edu
libtecla.h getline.c man3/gl_get_line.3 history.c history.h
I added a max_lines argument to gl_show_history() and
_glh_show_history(). This can optionally be used to
set a limit on the number of history lines displayed.
libtecla.h getline.c man3/gl_get_line.3
I added a new function called gl_replace_prompt(). This
can be used by gl_get_line() callback functions to
request that a new prompt be use when they return.
06/11/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
I implemented, bound and documented the list-history
action, used for listing historical lines of the current
history group.
getline.c man3/gl_get_line.3 man3/gl_echo_mode.3
I wrote functions to specify and query whether subsequent
lines will be visible as they are being typed.
28/10/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
For those cases where a terminal provides its own
high-level terminal editing facilities, you can now
specify an edit-mode argument of 'none'. This disables
all tecla key bindings, and by using canonical terminal
input mode instead of raw input mode, editing is left up
to the terminal driver.
21/10/2001 mcs@astro.caltech.edu
libtecla.h getline.c history.c history.h
man3/gl_get_line.3 man3/gl_history_info.3
I added the new gl_state_of_history(),
gl_range_of_history() and gl_size_of_history()
functions for querying information about the
history list.
history.c
While testing the new gl_size_of_history()
function, I noticed that when the history buffer
wrapped, any location nodes of old lines between
the most recent line and the end of the buffer
weren't being removed. This could result in bogus
entries appearing at the start of the history list.
Now fixed.
20/10/2001 mcs@astro.caltech.edu
libtecla.h getline.c history.c history.h
man3/gl_get_line.3 man3/gl_lookup_history.3
I added a function called gl_lookup_history(), that
the application can use to lookup lines in the history
list.
libtecla.h getline.c history.c history.h man3/gl_get_line.3
gl_show_history() now takes a format string argument
to control how the line is displayed, and with what
information. It also now provides the option of either
displaying all history lines or just those of the
current history group.
getline.c man3/gl_get_line.3
gl_get_line() only archives lines in the history buffer
if the newline action was invoked by a newline or
carriage return character.
16/10/2001 mcs@astro.caltech.edu
history.c history.h getline.c libtecla.h libtecla.map
man3/gl_get_line.3 man3/gl_resize_history.3
man3/gl_limit_history.3 man3/gl_clear_history.3
man3/gl_toggle_history.3
I added a number of miscellaneous history configuration
functions. You can now resize or delete the history
buffer, limit the number of lines that are allowed in the
buffer, clear either all history or just the history of
the current history group, and temporarily enable and
disable the history mechanism.
13/10/2001 mcs@astro.caltech.edu
getline.c
tputs_fp is now only declared if using termcap or
terminfo.
getline.c libtecla.map man3/gl_get_line.3
man3/gl_terminal_size.3
I added a public gl_terminal_size() function for
updating and querying the current size of the terminal.
update_version configure.in libtecla.h
A user noted that on systems where the configure script
couldn't be used, it was inconvenient to have the version
number macros set by the configure script, so they are
now specified in libtecla.h. To reduce the likelihood
that the various files where the version number now
appears might get out of sync, I have written the
update_version script, which changes the version number
in all of these files to a given value.
01/10/2001 mcs@astro.caltech.edu
getline.c history.c history.h man3/gl_get_line.3
I added a max_lines argument to gl_save_history(), to
allow people to optionally place a ceiling on the number
of history lines saved. Specifying this as -1 sets the
ceiling to infinity.
01/10/2001 mcs@astro.caltech.edu
configure.in configure
Under digital unix, getline wouldn't compile with
_POSIX_C_SOURCE set, due to type definitions needed by
select being excluded by this flag. Defining the
_OSF_SOURCE macro as well on this system, resolved this.
30/09/2001 mcs@astro.caltech.edu
getline.c libtecla.h history.c history.h man3/gl_get_line.3
man3/gl_group_history.3
I implemented history streams. History streams
effectively allow multiple history lists to be stored in
a single history buffer. Lines in the buffer are tagged
with the current stream identification number, and
lookups only consider lines that are marked with the
current stream identifier.
getline.c libtecla.h history.c history.h man3/gl_get_line.3
man3/gl_show_history.3
The new gl_show_history function displays the current
history to a given stdio output stream.
29/09/2001 mcs@astro.caltech.edu
getline.c
Previously new_GetLine() installed a persistent signal
handler to be sure to catch the SIGWINCH (terminal size
change) signal between calls to gl_get_line(). This had
the drawback that if multiple GetLine objects were
created, only the first GetLine object used after the
signal was received, would see the signal and adapt to
the new terminal size. Instead of this, a signal handler
for sigwinch is only installed while gl_get_line() is
running, and just after installing this handler,
gl_get_line() checks for terminal size changes that
might have occurred while the signal handler wasn't
installed.
getline.c
Dynamically allocated copies of capability strings looked
up in the terminfo or termcap databases are now made, so
that calls to setupterm() etc for one GetLine object
don't get trashed when another GetLine object calls
setupterm() etc. It is now safe to allocate and use
multiple GetLine objects, albeit only within a single
thread.
28/09/2001 mcs@astro.caltech.edu
version.c Makefile.rules
I added a function for querying the version number of
the library.
26/09/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
I added the new gl_watch_fd() function, which allows
applications to register callback functions to be invoked
when activity is seen on arbitrary file descriptors while
gl_get_line() is awaiting keyboard input from the user.
keytab.c
If a request is received to delete a non-existent
binding, which happens to be an ambiguous prefix of other
bindings no complaint is now generated about it being
ambiguous.
23/09/2001 mcs@astro.caltech.edu
getline.c history.c history.h man3/gl_get_line.3
libtecla.map demo.c
I added new public functions for saving and restoring the
contents of the history list. The demo program now uses
these functions to load and save history in ~/.demo_history.
23/09/2001 mcs@astro.caltech.edu
getline.c
On trying the demo for the first time on a KDE konsole
terminal, I discovered that the default M-O binding
to repeat history was hiding the arrow keys, which are
M-OA etc. I have removed this binding. The M-o (ie the
lower case version of this), is still bound.
18/09/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3 libtecla.map
Automatic reading of ~/.teclarc is now postponed until
the first call to gl_get_line(), to give the application
the chance to specify alternative configuration sources
with the new function gl_configure_getline(). The latter
function allows configuration to be done with a string, a
specified application-specific file, and/or a specified
user-specific file. I also added a read-init-files action
function, for re-reading the configuration files, if any.
This is by default bound to ^X^R. This is all documented
in gl_get_line.3.
08/09/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
It is now possible to bind actions to key-sequences
that start with printable characters. Previously
keysequences were required to start with meta or control
characters. This is documented in gl_get_line.3.
getline.c man3/gl_get_line.3
A customized completion function can now arrange for
gl_get_line() to return the current input line whenever a
successful completion has been made. This is signalled by
setting the last character of the optional continuation
suffix to a newline character. This is documented in
gl_get_line.3.
05/07/2001 Bug reported by Mike MacFaden, fixed by mcs
configure.in
There was a bug in the configure script that only
revealed itself on systems without termcap but not
terminfo (eg. NetBSD). I traced the bug back to a lack of
sufficient quoting of multi-line m4 macro arguments in
configure.in, and have now fixed this and recreated the
configure script.
05/07/2001 Bug reported and patched by Mike MacFaden (patch modified
by mcs to match original intentions).
getline.c
getline.c wouldn't compile when termcap was selected as
the terminal information database. setupterm() was being
passed a non-existent variable, in place of the term[]
argument of gl_control_strings(). Also if
gl_change_terminal() is called with term==NULL, "ansi"
is now substituted.
02/07/2001 Version 1.3.3 released.
27/06/2001 mcs@astro.caltech.edu
getline.c expand.c cplmatch.c
Added checks to fprintf() statements that write to the
terminal.
getline.c
Move the cursor to the end of the line before suspending,
so that the cursor doesn't get left in the middle of the
input line.
Makefile.in
On systems that don't support shared libraries, the
distclean target of make deleted libtecla.h. This has
now been fixed.
getline.c
gl_change_terminal() was being called by gl_change_editor(),
with the unwanted side effect that raw terminal modes were
stored as those to be restored later, if called by an
action function. gl_change_terminal() was being called in
this case to re-establish terminal-specific key bindings,
so I have just split this part of the function out into
a separate function for both gl_change_editor() and
gl_change_terminal() to call.
12/06/2001 mcs@astro.caltech.edu
getline.c
Signal handling has been improved. Many more signals are
now trapped, and instead of using a simple flag set by a
signal handler, race conditions are avoided by blocking
signals during most of the gl_get_line() code, and
unblocking them via calls to sigsetjmp(), just before
attempting to read each new character from the user.
The matching use of siglongjmp() in the signal
handlers ensures that signals are reblocked correctly
before they are handled. In most cases, signals cause
gl_get_line() to restore the terminal modes and signal
handlers of the calling application, then resend the
signal to the application. In the case of SIGINT, SIGHUP,
SIGPIPE, and SIGQUIT, if the process still exists after
the signals are resent, gl_get_line() immediately returns
with appropriate values assigned to errno. If SIGTSTP,
SIGTTIN or SIGTTOU signals are received, the process is
suspended. If any other signal is received, and the
process continues to exist after the signal is resent to
the calling application, line input is resumed after the
terminal is put back into raw mode, the gl_get_line()
signal handling is restored, and the input line redrawn.
man/gl_get_line(3)
I added a SIGNAL HANDLING section to the gl_get_line()
man page, describing the new signal handling features.
21/05/2001 Version 1.3.2 released.
21/05/2001 mcs@astro.caltech.edu
getline.c
When vi-replace-char was used to replace the character at
the end of the line, it left the cursor one character to
its right instead of on top of it. Now rememdied.
getline.c
When undoing, to properly emulate vi, the cursor is now
left at the leftmost of the saved and current cursor
positions.
getline.c man3/gl_get_line.3
Implemented find-parenthesis (%), delete-to-paren (M-d%),
vi-change-to-paren (M-c%), copy-to-paren (M-y%).
cplfile.c pcache.c
In three places I was comparing the last argument of
strncmp() to zero instead of the return value of
strncmp().
20/05/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
Implemented and documented the vi-repeat-change action,
bound to the period key. This repeats the last action
that modified the input line.
19/05/2001 mcs@astro.caltech.edu
man3/gl_get_line.3
I documented the new action functions and bindings
provided by Tim Eliseo, plus the ring-bell action and
the new "nobeep" configuration option.
getline.c
I modified gl_change_editor() to remove and reinstate the
terminal settings as well as the default bindings, since
these have editor-specific differences. I also modified
it to not abort if a key-sequence can't be bound for some
reason. This allows the new vi-mode and emacs-mode
bindings to be used safely.
getline.c
When the line was re-displayed on receipt of a SIGWINCH
signal, the result wasn't visible until the next
character was typed, since a call to fflush() was needed.
gl_redisplay_line() now calls gl_flush_output() to remedy
this.
17/05/2001 mcs@astro.catlech.edu
getline.c
Under Linux, calling fflush(gl->output_fd) hangs if
terminal output has been suspended with ^S. With the
tecla library taking responsability for reading the stop
and start characters this was a problem, because once
hung in fflush(), the keyboard input loop wasn't entered,
so the user couldn't type the start character to resume
output. To remedy this, I now have the terminal process
these characters, rather than the library.
12/05/2001 mcs@astro.caltech.edu
getline.c
The literal-next action is now implemented as a single
function which reads the next character itself.
Previously it just set a flag which effected the
interpretation of the next character read by the input
loop.
getline.c
Added a ring-bell action function. This is currently
unbound to any key by default, but it is used internally,
and can be used by users that want to disable any of the
default key-bindings.
12/05/2001 Tim Eliseo (logged here by mcs)
getline.c
Don't reset gl->number until after calling an action
function. By looking at whether gl->number is <0 or
not, action functions can then tell whether the count
that they were passed was explicitly specified by the
user, as opposed to being defaulted to 1.
getline.c
In vi, the position at which input mode is entered
acts as a barrier to backward motion for the few
backward moving actions that are enabled in input mode.
Tim added this barrier to getline.
getline.c
In gl_get_line() after reading an input line, or
having the read aborted by a signal, the sig_atomic_t
gl_pending_signal was being compared to zero instead
of -1 to see if no signals had been received.
gl_get_line() will thus have been calling raise(-1),
which luckily didn't seem to do anything. Tim also
arranged for errno to be set to EINTR when a signal
aborts gl_get_line().
getline.c
The test in gl_add_char_to_line() for detecting
when overwriting a character with a wider character,
had a < where it needed a >. Overwriting with a wider
character thus overwrote trailing characters. Tim also
removed a redundant copy of the character into the
line buffer.
getline.c
gl_cursor_left() and gl->cursor_right() were executing
a lot of redundant code, when the existing call to the
recently added gl_place_cursor() function, does all that
is necessary.
getline.c
Remove redundant code from backward_kill_line() by
re-implimenting in terms of gl_place_cursor() and
gl_delete_chars().
getline.c
gl_forward_delete_char() now records characters in cut
buffer when in vi command mode.
getline.c
In vi mode gl_backward_delete_char() now only deletes
up to the point at which input mode was entered. Also
gl_delete_chars() restores from the undo buffer when
deleting in vi insert mode.
getline.c
Added action functions, vi-delete-goto-column,
vi-change-to-bol, vi-change-line, emacs-mode, vi-mode,
vi-forward-change-find, vi-backward-change-find,
vi-forward-change-to, vi-backward-change-to,
vi-change-goto-col, forward-delete-find, backward-delete-find,
forward-delete-to, backward-delete-to,
delete-refind, delete-invert-refind, forward-copy-find,
backward-copy-find, forward-copy-to, backward-copy-to
copy-goto-column, copy-rest-of-line, copy-to-bol, copy-line,
history-re-search-forward, history-re-search-backward.
06/05/2001 Version 1.3.1 released.
03/05/2001 mcs@astro.caltech.edu
configure.in
Old versions of GNU ld don't accept version scripts.
Under Linux I thus added a test to try out ld with
the --version-script argument to see if it works.
If not, version scripts aren't used.
configure.in
My test for versions of Solaris earlier than 7
failed when confronted by a three figure version
number (2.5.1). Fixed.
30/04/2001 mcs@astro.caltech.edu
getline.c
In vi mode, history-search-backward and
history-search-forward weren't doing anything when
invoked at the start of an empty line, whereas
they should have acted like up-history and down-history.
Makefile.in Makefile.rules
When shared libraries are being created, the build
procedure now arranges for any alternate library
links to be created as well, before linking the
demos. Without this the demos always linked to the
static libraries (which was perfectly ok, but wasn't a
good example).
Makefile.in Makefile.rules
On systems on which shared libraries were being created,
if there were no alternate list of names, make would
abort due to a Bourne shell 'for' statement that didn't
have any arguments. Currently there are no systems who's
shared library configurations would trigger this
problem.
Makefile.rules
The demos now relink to take account of changes to the
library.
configure.in configure
When determining whether the reentrant version of the
library should be compiled by default, the configure
script now attempts to compile a dummy program that
includes all of the appropriate system headers and
defines _POSIX_C_SOURCE. This should now be a robust test
on systems which use C macros to alias these function
names to other internal functions.
configure.in
Under Solaris 2.6 and earlier, the curses library is in
/usr/ccs/lib. Gcc wasn't finding this. In addition to
remedying this, I had to remove "-z text" from
LINK_SHARED under Solaris to get it to successfully
compile the shared library against the static curses
library.
configure.in
Under Linux the -soname directive was being used
incorrectly, citing the fully qualified name of the
library instead of its major version alias. This will
unfortunately mean that binaries linked with the 1.2.3
and 1.2.4 versions of the shared library won't use
later versions of the library unless relinked.
30/04/2001 mcs@astro.caltech.edu
getline.c
In gl_get_input_line(), don't redundantly copy the
start_line if start_line == gl->line.
30/04/2001 Version 1.3.0 released.
28/04/2001 mcs@astro.caltech.edu
configure.in
I removed the --no-undefined directive from the Linux
LINK_SHARED command. After recent patches to our RedHat
7.0 systems ld started reporting some internal symbols of
libc as being undefined. Using nm on libc indicated that
the offending symbols are indeed defined, albeit as
"common" symbols, so there appears to be a bug in
RedHat's ld. Removing this flag allows the tecla shared
library to compile, and programs appear to function fine.
man3/gl_get_line.3
The default key-sequence used to invoke the
read-from-file action was incorrectly cited as ^Xi
instead of ^X^F.
26/04/2001 mcs@astro.caltech.edu
getline.c man3/gl_get_line.3
A new vi-style editing mode was added. This involved
adding many new action functions, adding support for
specifying editing modes in users' ~/.teclarc files,
writing a higher level cursor motion function to support
the different line-end bounds required in vi command
mode, and a few small changes to support the fact that vi
has two modes, input mode and command mode with different
bindings.
When vi editing mode is enabled, any binding that starts
with an escape or a meta character, is interpreted as a
command-mode binding, and switches the library to vi
command mode if not already in that mode. Once in command
mode the first character of all keysequences entered
until input mode is re-enabled, are quietly coerced to
meta characters before being looked up in the key-binding
table. So, for example, in the key-binding table, the
standard vi command-mode 'w' key, which moves the cursor
one word to the right, is represented by M-w. This
emulates vi's dual sets of bindings in a natural way
without needing large changes to the library, or new
binding syntaxes. Since cursor keys normally emit
keysequences which start with escape, it also does
something sensible when a cursor key is pressed during
input mode (unlike true vi, which gets upset).
I also added a ^Xg binding for the new list-glob action
to both the emacs and vi key-binding tables. This lists
the files that match the wild-card expression that
precedes it on the command line.
The function that reads in ~/.teclarc used to tell
new_GetLine() to abort if it encountered anything that it
didn't understand in this file. It now just reports an
error and continues onto the next line.
Makefile.in:
When passing LIBS=$(LIBS) to recursive invokations of
make, quotes weren't included around the $(LIBS) part.
This would cause problems if LIBS ever contained more
than one word (with the supplied configure script this
doesn't happen currently). I added these quotes.
expand.c man3/ef_expand_file.3:
I wrote a new public function called ef_list_expansions(),
to list the matching filenames returned by
ef_expand_file().
I also fixed the example in the man page, which cited
exp->file instead of exp->files, and changed the
dangerous name 'exp' with 'expn'.
keytab.c:
Key-binding tables start with 100 elements, and are
supposedly incremented in size by 100 elements whenever
the a table runs out of space. The realloc arguments to
do this were wrong. This would have caused problems if
anybody added a lot of personal bindings in their
~/.teclarc file. I only noticed it because the number of
key bindings needed by the new vi mode exceeded this
number.
libtecla.map
ef_expand_file() is now reported as having been added in
the upcoming 1.3.0 release.
25/03/2001 Markus Gyger (logged here by mcs)
Makefile.in:
Make symbolic links to alternative shared library names
relative instead of absolute.
Makefile.rules:
The HP-UX libtecla.map.opt file should be made in the
compilation directory, to allow the source code directory
to be on a readonly filesystem.
cplmatch.c demo2.c history.c pcache.c
To allow the library to be compiled with a C++ compiler,
without generating warnings, a few casts were added where
void* return values were being assigned directly to
none void* pointer variables.
25/03/2001 mcs@astro.caltech.edu
libtecla.map:
Added comment header to explain the purpose of the file.
Also added cpl_init_FileArgs to the list of exported
symbols. This symbol is deprecated, and no longer
documented, but for backwards compatibility, it should
still be exported.
configure:
I had forgotten to run autoconf before releasing version
1.2.4, so I have just belatedly done so. This enables
Markus' changes to "configure.in" documented previously,
(see 17/03/2001).
20/03/2001 John Levon (logged here by mcs)
libtecla.h
A couple of the function prototypes in libtecla.h have
(FILE *) argument declarations, which means that stdio.h
needs to be included. The header file should be self
contained, so libtecla.h now includes stdio.h.
18/03/2001 Version 1.2.4 released.
README html/index.html configure.in
Incremented minor version from 3 to 4.
18/03/2001 mcs@astro.caltech.edu
getline.c
The fix for the end-of-line problem that I released a
couple of weeks ago, only worked for the first line,
because I was handling this case when the cursor position
was equal to the last column, rather than when the cursor
position modulo ncolumn was zero.
Makefile.in Makefile.rules
The demos are now made by default, their rules now being
int Makefile.rules instead of Makefile.in.
INSTALL
I documented how to compile the library in a different
directory than the distribution directory.
I also documented features designed to facilitate
configuring and building the library as part of another
package.
17/03/2001 Markus Gyger (logged here by mcs)
getline.c
Until now cursor motions were done one at a time. Markus
has added code to make use the of the terminfo capability
that moves the cursor by more than one position at a
time. This greatly improves performance when editing near
the start of long lines.
getline.c
To further improve performance, Markus switched from
writing one character at a time to the terminal, using
the write() system call, to using C buffered output
streams. The output buffer is only flushed when
necessary.
Makefile.rules Makefile.in configure.in
Added support for compiling for different architectures
in different directories. Simply create another directory
and run the configure script located in the original
directory.
Makefile.in configure.in libtecla.map
Under Solaris, Linux and HP-UX, symbols that are to be
exported by tecla shared libraries are explicitly specified
via symbol map files. Only publicly documented functions
are thus visible to applications.
configure.in
When linking shared libraries under Solaris SPARC,
registers that are reserved for applications are marked
as off limits to the library, using -xregs=no%appl when
compiling with Sun cc, or -mno-app-regs when compiling
with gcc. Also removed -z redlocsym for Solaris, which
caused problems under some releases of ld.
homedir.c (after minor changes by mcs)
Under ksh, ~+ expands to the current value of the ksh
PWD environment variable, which contains the path of
the current working directory, including any symbolic
links that were traversed to get there. The special
username "+" is now treated equally by tecla, except
that it substitutes the return value of getcwd() if PWD
either isn't set, or if it points at a different
directory than that reported by getcwd().
08/03/2001 Version 1.2.3 released.
08/03/2001 mcs@astro.caltech.edu
getline.c
On compiling the library under HP-UX for the first time
I encountered and fixed a couple of bugs:
1. On all systems except Solaris, the callback function
required by tputs() takes an int argument for the
character that is to be printed. Under Solaris it
takes a char argument. The callback function was
passing this argument, regardless of type, to write(),
which wrote the first byte of the argument. This was
fine under Solaris and under little-endian systems,
because the first byte contained the character to be
written, but on big-endian systems, it always wrote
the zero byte at the other end of the word. As a
result, no control characters were being written to
the terminal.
2. While attempting to start a newline after the user hit
enter, the library was outputting the control sequence
for moving the cursor down, instead of the newline
character. On many systems the control sequence for
moving the cursor down happends to be a newline
character, but under HP-UX it isn't. The result was
that no new line was being started under HP-UX.
04/03/2001 mcs@astro.caltech.edu
configure.in Makefile.in Makefile.stub configure config.guess
config.sub Makefile.rules install-sh PORTING README INSTALL
Configuration and compilation of the library is now
performed with the help of an autoconf configure
script. In addition to relieving the user of the need to
edit the Makefile, this also allows automatic compilation
of the reentrant version of the library on platforms that
can handle it, along with the creation of shared
libraries where configured. On systems that aren't known
to the configure script, just the static tecla library is
compiled. This is currently the case on all systems
except Linux, Solaris and HP-UX. In the hope that
installers will provide specific conigurations for other
systems, the configure.in script is heavily commented,
and instructions on how to use are included in a new
PORTING file.
24/02/2001 Version 1.2b released.
22/02/2001 mcs@astro.caltech.edu
getline.c
It turns out that most terminals, but not all, on writing
a character in the rightmost column, don't wrap the
cursor onto the next line until the next character is
output. This library wasn't aware of this and thus if one
tried to reposition the cursor from the last column,
gl_get_line() thought that it was moving relative to a
point on the next line, and thus moved the cursor up a
line. The fix was to write one extra character when in
the last column to force the cursor onto the next line,
then backup the cursor to the start of the new line.
getline.c
On terminal initialization, the dynamic LINES and COLUMNS
environment variables were ignored unless
terminfo/termcap didn't return sensible dimensions. In
practice, when present they should override the static
versions in the terminfo/termcap databases. This is the
new behavior. In reality this probably won't have caused
many problems, because a SIGWINCH signal which informs of
terminal size changes is sent when the terminal is
opened, so the dimensions established during
initialization quickly get updated on most systems.
18/02/2001 Version 1.2a released.
18/02/2001 mcs@astro.caltech.edu
getline.c
Three months ago I moved the point at which termios.h
was included in getline.c. Unfortunately, I didn't notice
that this moved it to after the test for TIOCGWINSZ being
defined. This resulted in SIGWINCH signals not being
trapped for, and thus terminal size changes went
unnoticed. I have now moved the test to after the
inclusion of termios.h.
12/02/2001 Markus Gyger (described here by mcs)
man3/pca_lookup_file.3 man3/gl_get_line.3
man3/ef_expand_file.3 man3/cpl_complete_word.3
In the 1.2 release of the library, all functions in the
library were given man pages. Most of these simply
include one of the above 4 man pages, which describe the
functions while describing the modules that they are in.
Markus added all of these function names to the lists in
the "NAME" headers of the respective man pages.
Previously only the primary function of each module was
named there.
11/02/2001 mcs@astro.caltech.edu
getline.c
On entering a line that wrapped over two or more
terminal, if the user pressed enter when the cursor
wasn't on the last of the wrapped lines, the text of the
wrapped lines that followed it got mixed up with the next
line written by the application, or the next input
line. Somehow this slipped through the cracks and wasn't
noticed until now. Anyway, it is fixed now.
09/02/2001 Version 1.2 released.
04/02/2001 mcs@astro.caltech.edu
pcache.c libtecla.h
With all filesystems local, demo2 was very fast to start
up, but on a Sun system with one of the target
directories being on a remote nfs mounted filesystem, the
startup time was many seconds. This was due to the
executable selection callback being applied to all files
in the path at startup. To avoid this, all files are now
included in the cache, and the application specified
file-selection callback is only called on files as they
are matched. Whether the callback rejected or accepted
them is then cached so that the next time an already
checked file is looked at, the callback doesn't have to
be called. As a result, startup is now fast on all
systems, and since usually there are only a few matching
file completions at a time, the delay during completion
is also usually small. The only exception is if the user
tries to complete an empty string, at which point all
files have to be checked. Having done this once, however,
doing it again is fast.
man3/pca_lookup_file.3
I added a man page documenting the new PathCache module.
man3/<many-new-files>.3
I have added man pages for all of the functions in each
of the modules. These 1-line pages use the .so directive
to redirect nroff to the man page of the parent module.
man Makefile update_html
I renamed man to man3 to make it easier to test man page
rediction, and updated Makefile and update_html
accordingly. I also instructed update_html to ignore
1-line man pages when making html equivalents of the man
pages.
cplmatch.c
In cpl_list_completions() the size_t return value of
strlen() was being used as the length argument of a "%*s"
printf directive. This ought to be an int, so the return
value of strlen() is now cast to int. This would have
caused problems on architectures where the size of a
size_t is not equal to the size of an int.
02/02/2001 mcs@astro.caltech.edu
getline.c
Under UNIX, certain terminal bindings are set using the
stty command. This, for example, specifies which control
key generates a user-interrupt (usually ^C or ^Y). What I
hadn't realized was that ASCII NUL is used as the way to
specify that one of these bindings is unset. I have now
modified the code to skip unset bindings, leaving the
corresponding action bound to the built-in default, or a
user provided binding.
28/01/2001 mcs@astro.caltech.edu
pcache.c libtecla.h
A new module was added which supports searching for files
in any colon separated list of directories, such as the
unix execution PATH environment variable. Files in these
directories, after being individually okayed for
inclusion via an application provided callback, are
cached in a PathCache object. You can then look up the
full pathname of a given filename, or you can use the
provided completion callback to list possible completions
in the path-list. The contents of relative directories,
such as ".", obviously can't be cached, so these
directories are read on the fly during lookups and
completions. The obvious application of this facility is
to provide Tab-completion of commands, and thus a
callback to place executable files in the cache, is
provided.
demo2.c
This new program demonstrates the new PathCache
module. It reads and processes lines of input until the
word 'exit' is entered, or C-d is pressed. The default
tab-completion callback is replaced with one which at the
start of a line, looks up completions of commands in the
user's execution path, and when invoked in other parts of
the line, reverts to normal filename completion. Whenever
a new line is entered, it extracts the first word on the
line, looks it up in the user's execution path to see if
it corresponds to a known command file, and if so,
displays the full pathname of the file, along with the
remaining arguments.
cplfile.c
I added an optional pair of callback function/data
members to the new cpl_file_completions() configuration
structure. Where provided, this callback is asked
on a file-by-file basis, which files should be included
in the list of file completions. For example, a callback
is provided for listing only completions of executable
files.
cplmatch.c
When listing completions, the length of the type suffix
of each completion wasn't being taken into account
correctly when computing the column widths. Thus the
listing appeared ragged sometimes. This is now fixed.
pathutil.c
I added a function for prepending a string to a path,
and another for testing whether a pathname referred to
an executable file.
28/01/2001 mcs@astro.caltech.edu
libtecla.h cplmatch.c man/cpl_complete_word.3
The use of a publically defined structure to configure
the cpl_file_completions() callback was flawed, so a new
approach has been designed, and the old method, albeit
still supported, is no longer documented in the man
pages. The definition of the CplFileArgs structure in
libtecla.h is now accompanied by comments warning people
not to modify it, since modifications could break
applications linked to shared versions of the tecla
library. The new method involves an opaque CplFileConf
object, instances of which are returned by a provided
constructor function, configured with provided accessor
functions, and when no longer needed, deleted with a
provided destructor function. This is documented in the
cpl_complete_word man page. The cpl_file_completions()
callback distinguishes what type of configuration
structure it has been sent by virtue of a code placed at
the beginning of the CplFileConf argument by its
constructor.
04/01/2001 mcs@astro.caltech.edu (Release of version 1.1j)
getline.c
I added upper-case bindings for the default meta-letter
keysequences such as M-b. They thus continue to work
when the user has caps-lock on.
Makefile
I re-implemented the "install" target in terms of new
install_lib, install_inc and install_man targets. When
distributing the library with other packages, these new
targets allows for finer grained control of the
installation process.
30/12/2000 mcs@astro.caltech.edu
getline.c man/gl_get_line.3
I realized that the recall-history action that I
implemented wasn't what Markus had asked me for. What he
actually wanted was for down-history to continue going
forwards through a previous history recall session if no
history recall session had been started while entering
the current line. I have thus removed the recall-history
action and modified the down-history action function
accordingly.
24/12/2000 mcs@astro.caltech.edu
getline.c
I modified gl_get_line() to allow the previously returned
line to be passed in the start_line argument.
getline.c man/gl_get_line.3
I added a recall-history action function, bound to M^P.
This recalls the last recalled history line, regardless
of whether it was from the current or previous line.
13/12/2000 mcs@astro.caltech.edu (Release of version 1.1i)
getline.c history.h history.c man/gl_get_line.3
I implemented the equivalent of the ksh Operate action. I
have named the tecla equivalent "repeat-history". This
causes the line that is to be edited to returned, and
arranges for the next most recent history line to be
preloaded on the next call to gl_get_line(). Repeated
invocations of this action thus result in successive
history lines being repeated - hence the
name. Implementing the ksh Operate action was suggested
by Markus Gyger. In ksh it is bound to ^O, but since ^O
is traditionally bound by the default terminal settings,
to stop-output, I have bound the tecla equivalent to M-o.
01/12/2000 mcs@astro.caltech.edu (Release of version 1.1h)
getline.c keytab.c keytab.h man/gl_get_line.3
I added a digit-argument action, to allow repeat
counts for actions to be entered. As in both tcsh
and readline, this is bound by default to each of
M-0, M-1 through to M-9, the number being appended
to the current repeat count. Once one of these has been
pressed, the subsequent digits of the repeat count can be
typed with or without the meta key pressed. It is also
possible to bind digit-argument to other keys, with or
without a numeric final keystroke. See man page for
details.
getline.c man/gl_get_line.3
Markus noted that my choice of M-< for the default
binding of read-from-file, could be confusing, since
readline binds this to beginning-of-history. I have
thus rebound it to ^X^F (ie. like find-file in emacs).
getline.c history.c history.h man/gl_get_line.3
I have now implemented equivalents of the readline
beginning-of-history and end-of-history actions.
These are bound to M-< and M-> respectively.
history.c history.h
I Moved the definition of the GlHistory type, and
its subordinate types from history.h to history.c.
There is no good reason for any other module to
have access to the innards of this structure.
27/11/2000 mcs@astro.caltech.edu (Release of version 1.1g)
getline.c man/gl_get_line.3
I added a "read-from-file" action function and bound it
by default to M-<. This causes gl_get_line() to
temporarily return input from the file who's name
precedes the cursor.
26/11/2000 mcs@astro.caltech.edu
getline.c keytab.c keytab.h man/gl_get_line.3
I have reworked some of the keybinding code again.
Now, within key binding strings, in addition to the
previously existing notation, you can now use M-a to
denote meta-a, and C-a to denote control-a. For example,
a key binding which triggers when the user presses the
meta key, the control key and the letter [
simultaneously, can now be denoted by M-C-[, or M-^[ or
\EC-[ or \E^[.
I also updated the man page to use M- instead of \E in
the list of default bindings, since this looks cleaner.
getline.c man/gl_get_line.3
I added a copy-region-as-kill action function and
gave it a default binding to M-w.
22/11/2000 mcs@astro.caltech.edu
*.c
Markus Gyger sent me a copy of a previous version of
the library, with const qualifiers added in appropriate
places. I have done the same for the latest version.
Among other things, this gets rid of the warnings
that are generated if one tells the compiler to
const qualify literal strings.
getline.c getline.h glconf.c
I have moved the contents of glconf.c and the declaration
of the GetLine structure into getline.c. This is cleaner,
since now only functions in getline.c can mess with the
innards of GetLine objects. It also clears up some problems
with system header inclusion order under Solaris, and also
the possibility that this might result in inconsistent
system macro definitions, which in turn could cause different
declarations of the structure to be seen in different files.
hash.c
I wrote a wrapper function to go around strcmp(), such that
when hash.c is compiled with a C++ compiler, the pointer
to the wrapper function is a C++ function pointer.
This makes it compatible with comparison function pointer
recorded in the hash table.
cplmatch.c getline.c libtecla.h
Markus noted that the Sun C++ compiler wasn't able to
match up the declaration of cpl_complete_word() in
libtecla.h, where it is surrounded by a extern "C" {}
wrapper, with the definition of this function in
cplmatch.c. My suspicion is that the compiler looks not
only at the function name, but also at the function
arguments to see if two functions match, and that the
match_fn() argument, being a fully blown function pointer
declaration, got interpetted as that of a C function in
one case, and a C++ function in the other, thus
preventing a match.
To fix this I now define a CplMatchFn typedef in libtecla.h,
and use this to declare the match_fn callback.
20/11/2000 (Changes suggested by Markus Gyger to support C++ compilers):
expand.c
Renamed a variable called "explicit" to "xplicit", to
avoid conflicts when compiling with C++ compilers.
*.c
Added explicit casts when converting from (void *) to
other pointer types. This isn't needed in C but it is
in C++.
getline.c
tputs() has a strange declaration under Solaris. I was
enabling this declaration when the SPARC feature-test
macro was set. Markus changed the test to hinge on the
__sun and __SVR4 macros.
direader.c glconf.c stringrp.c
I had omitted to include string.h in these two files.
Markus also suggested some other changes, which are still
under discussion. With the just above changes however, the
library compiles without complaint using g++.
19/11/2000 mcs@astro.caltech.edu
getline.h getline.c keytab.c keytab.h glconf.c
man/gl_get_line.3
I added support for backslash escapes (include \e
for the keyboard escape key) and literal binary
characters to the characters allowed within key sequences
of key bindings.
getline.h getline.c keytab.c keytab.h glconf.c
man/gl_get_line.3
I introduced symbolic names for the arrow keys, and
modified the library to use the cursor key sequences
reported by terminfo/termcap in addition to the default
ANSI ones. Anything bound to the symbolically named arrow
keys also gets bound to the default and terminfo/termcap
cursor key sequences. Note that under Solaris
terminfo/termcap report the properties of hardware X
terminals when TERM is xterm instead of the terminal
emulator properties, and the cursor keys on these two
systems generate different key sequences. This is an
example of why extra default sequences are needed.
getline.h getline.c keytab.c
For some reason I was using \e to represent the escape
character. This is supported by gcc, which thus doesn't
emit a warning except with the -pedantic flag, but isn't
part of standard C. I now use a macro to define escape
as \033 in getline.h, and this is now used wherever the
escape character is needed.
17/11/2000 mcs@astro.caltech.edu (Release of version 1.1d)
getline.c, man/gl_get_line(3), html/gl_get_line.html
In tcsh ^D is bound to a function which does different
things depending on where the cursor is within the input
line. I have implemented its equivalent in the tecla
library. When invoked at the end of the line this action
function displays possible completions. When invoked on
an empty line it causes gl_get_line() to return NULL,
thus signalling end of input. When invoked within a line
it invokes forward-delete-char, as before. The new action
function is called del-char-or-list-or-eof.
getline.c, man/gl_get_line(3), html/gl_get_line.html
I found that the complete-word and expand-file actions
had underscores in their names instead of hyphens. This
made them different from all other action functions, so I
have changed the underscores to hyphens.
homedir.c
On SCO UnixWare while getpwuid_r() is available, the
associated _SC_GETPW_R_SIZE_MAX macro used by sysconf()
to find out how big to make the buffer to pass to this
function to cater for any password entry, doesn't
exist. I also hadn't catered for the case where sysconf()
reports that this limit is indeterminate. I have thus
change the code to substitute a default limit of 1024 if
either the above macro isn't defined or if sysconf() says
that the associated limit is indeterminate.
17/11/2000 mcs@astro.caltech.edu (Release of version 1.1c)
getline.c, getline.h, history.c, history.h
I have modified the way that the history recall functions
operate, to make them better emulate the behavior of
tcsh. Previously the history search bindings always
searched for the prefix that preceded the cursor, then
left the cursor at the same point in the line, so that a
following search would search using the same prefix. This
isn't how tcsh operates. On finding a matching line, tcsh
puts the cursor at the end of the line, but arranges for
the followup search to continue with the same prefix,
unless the user does any cursor motion or character
insertion operations in between, in which case it changes
the search prefix to the new set of characters that are
before the cursor. There are other complications as well,
which I have attempted to emulate. As far as I can
tell, the tecla history recall facilities now fully
emulate those of tcsh.
16/11/2000 mcs@astro.caltech.edu (Release of version 1.1b)
demo.c:
One can now quit from the demo by typing exit.
keytab.c:
The first entry of the table was getting deleted
by _kt_clear_bindings() regardless of the source
of the binding. This deleted the up-arrow binding.
Symptoms noted by gazelle@yin.interaccess.com.
getline.h:
Depending on which system include files were include
before the inclusion of getline.h, SIGWINCH and
TIOCGWINSZ might or might not be defined. This resulted
in different definitions of the GetLine object in
different files, and thus some very strange bugs! I have
now added #includes for the necessary system header files
in getline.h itself. The symptom was that on creating a
~/.teclarc file, the demo program complained of a NULL
argument to kt_set_keybinding() for the first line of the
file.
15/11/2000 mcs@astro.caltech.edu (Release of version 1.1a)
demo.c:
I had neglected to check the return value of
new_GetLine() in the demo program. Oops.
getline.c libtecla.h:
I wrote gl_change_terminal(). This allows one to change to
a different terminal or I/O stream, by specifying the
stdio streams to use for input and output, along with the
type of terminal that they are connected to.
getline.c libtecla.h:
Renamed GetLine::isterm to GetLine::is_term. Standard
C reserves names that start with "is" followed by
alphanumeric characters, so this avoids potential
clashes in the future.
keytab.c keytab.h
Each key-sequence can now have different binding
functions from different sources, with the user provided
binding having the highest precedence, followed by the
default binding, followed by any terminal specific
binding. This allows gl_change_terminal() to redefine the
terminal-specific bindings each time that
gl_change_terminal() is called, without overwriting the
user specified or default bindings. In the future, it will
also allow for reconfiguration of user specified
bindings after the call to new_GetLine(). Ie. deleting a
user specified binding should reinstate any default or
terminal specific binding.
man/cpl_complete_word.3 html/cpl_complete_word.html
man/ef_expand_file.3 html/ef_expand_file.html
man/gl_get_line.3 html/gl_get_line.html
I added sections on thread safety to the man pages of the
individual modules.
man/gl_get_line.3 html/gl_get_line.html
I documented the new gl_change_terminal() function.
man/gl_get_line.3 html/gl_get_line.html
In the description of the ~/.teclarc configuration file,
I had omitted the 'bind' command word in the example
entry. I have now remedied this.
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