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This document details the changes between this version, readline-4.2,
and the previous version, readline-4.1.

1.  Changes to Readline

a.  When setting the terminal attributes on systems using `struct termio',
    readline waits for output to drain before changing the attributes.

b.  A fix was made to the history word tokenization code to avoid attempts to
    dereference a null pointer.

c.  Readline now defaults rl_terminal_name to $TERM if the calling application
    has left it unset, and tries to initialize with the resultant value.

d.  Instead of calling (*rl_getc_function)() directly to get input in certain
    places, readline now calls rl_read_key() consistently.

e.  Fixed a bug in the completion code that allowed a backslash to quote a
    single quote inside a single-quoted string.

f.  rl_prompt is no longer assigned directly from the argument to readline(),
    but uses memory allocated by readline.  This allows constant strings to
    be passed to readline without problems arising when the prompt processing
    code wants to modify the string.

g.  Fixed a bug that caused non-interactive history searches to return the
    wrong line when performing multiple searches backward for the same string.

h.  Many variables, function arguments, and function return values are now
    declared `const' where appropriate, to improve behavior when linking with
    C++ code.

i.  The control character detection code now works better on systems where
    `char' is unsigned by default.

j.  The vi-mode numeric argument is now capped at 999999, just like emacs mode.

k.  The Function, CPFunction, CPPFunction, and VFunction typedefs have been
    replaced with a set of specific prototyped typedefs, though they are
    still in the readline header files for backwards compatibility.

m.  Nearly all of the (undocumented) internal global variables in the library
    now have an _rl_ prefix -- there were a number that did not, like
    screenheight, screenwidth, alphabetic, etc.

n.  The ding() convenience function has been renamed to rl_ding(), though the
    old function is still defined for backwards compatibility.

o.  The completion convenience functions filename_completion_function,
    username_completion_function, and completion_matches now have an rl_
    prefix, though the old names are still defined for backwards compatibility.

p.  The functions shared by readline and bash (linkage is satisfied from bash
    when compiling with bash, and internally otherwise) now have an sh_ prefix.

q.  Changed the shared library creation procedure on Linux and BSD/OS 4.x so
    that the `soname' contains only the major version number rather than the
    major and minor numbers.

r.  Fixed a redisplay bug that occurred when the prompt spanned more than one
    physical line and contained invisible characters.

s.  Added a missing `includedir' variable to the Makefile.

t.  When installing the shared libraries, make sure symbolic links are relative.

u.  Added configure test so that it can set `${MAKE}' appropriately.

v.  Fixed a bug in rl_forward that could cause the point to be set to before
    the beginning of the line in vi mode.

w.  Fixed a bug in the callback read-char interface to make it work when a
    readline function pushes some input onto the input stream with
    rl_execute_next (like the incremental search functions).

x.  Fixed a file descriptor leak in the history file manipulation code that
    was tripped when attempting to truncate a non-regular file (like
    /dev/null).

y.  Changes to make all of the exported readline functions declared in
    readline.h have an rl_ prefix (rltty_set_default_bindings is now
    rl_tty_set_default_bindings, crlf is now rl_crlf, etc.)

z.  The formatted documentation included in the base readline distribution
    is no longer removed on a `make distclean'.

aa. Some changes were made to avoid gcc warnings with -Wall.

bb. rl_get_keymap_by_name now finds keymaps case-insensitively, so
    `set keymap EMACS' works.

cc. The history file writing and truncation functions now return a useful
    status on error.

dd. Fixed a bug that could cause applications to dereference a NULL pointer
    if a NULL second argument was passed to history_expand().

ee. If a hook function assigned to rl_event_hook sets rl_done to a non-zero
    value, rl_read_key() now immediately returns '\n' (which is assumed to   
    be bound to accept-line).

2.  New Features in Readline

a.  The blink timeout for paren matching is now settable by applications,
    via the rl_set_paren_blink_timeout() function.

b.  _rl_executing_macro has been renamed to rl_executing_macro, which means
    it's now part of the public interface.

c.  Readline has a new variable, rl_readline_state, which is a bitmap that
    encapsulates the current state of the library; intended for use by
    callbacks and hook functions.

d.  rlfe has a new -l option to log input and output (-a appends to logfile),
    a new -n option to set the readline application name, and -v and -h
    options for version and help information.

e.  rlfe can now perform filename completion for the inferior process if the
    OS has a /proc/<PID>/cwd that can be read with readlink(2) to get the
    inferior's current working directory.

f.  A new file, rltypedefs.h, contains the new typedefs for function pointers
    and is installed by `make install'.

g.  New application-callable function rl_set_prompt(const char *prompt):
    expands its prompt string argument and sets rl_prompt to the result.

h.  New application-callable function rl_set_screen_size(int rows, int cols):
    public method for applications to set readline's idea of the screen
    dimensions.

i.  The history example program (examples/histexamp.c) is now built as one
    of the examples.

j.  The documentation has been updated to cover nearly all of the public
    functions and variables declared in readline.h.

k.  New function, rl_get_screen_size (int *rows, int *columns), returns
    readline's idea of the screen dimensions.

l.  The timeout in rl_gather_tyi (readline keyboard input polling function)
    is now settable via a function (rl_set_keyboard_input_timeout()).

m.  Renamed the max_input_history variable to history_max_entries; the old
    variable is maintained for backwards compatibility.

n.  The list of characters that separate words for the history tokenizer is
    now settable with a variable:  history_word_delimiters.  The default
    value is as before.

o.  There is a new history.3 manual page documenting the history library.

-------------------------------------------------------------------------------
This document details the changes between this version, readline-4.1,
and the previous version, readline-4.0.

1.  Changes to Readline

a.  Changed the HTML documents so that the table-of-contents is no longer
    a separate file.

b.  Changes to the shared object configuration for: Irix 5.x, Irix 6.x,
    OSF/1.

c.  The shared library major and minor versions are now constructed
    automatically by configure and substituted into the makefiles.

d.  It's now possible to install the shared libraries separately from the
    static libraries.

e.  The history library tries to truncate the history file only if it is a
    regular file.

f.  A bug that caused _rl_dispatch to address negative array indices on
    systems with signed chars was fixed.

g.  rl-yank-nth-arg now leaves the history position the same as when it was
    called.

h.  Changes to the completion code to handle MS-DOS drive-letter:pathname
    filenames.

i.  Completion is now case-insensitive by default on MS-DOS.

j.  Fixes to the history file manipulation code for MS-DOS.

k.  Readline attempts to bind the arrow keys to appropriate defaults on MS-DOS.

l.  Some fixes were made to the redisplay code for better operation on MS-DOS.

m.  The quoted-insert code will now insert tty special chars like ^C.

n.  A bug was fixed that caused the display code to reference memory before
    the start of the prompt string.

o.  More support for __EMX__ (OS/2).

p.  A bug was fixed in readline's signal handling that could cause infinite
    recursion in signal handlers.

q.  A bug was fixed that caused the point to be less than zero when rl_forward
    was given a very large numeric argument.

r.  The vi-mode code now gets characters via the application-settable value
    of rl_getc_function rather than calling rl_getc directly.

s.  The history file code now uses O_BINARY mode when reading and writing
    the history file on cygwin32.

t.  Fixed a bug in the redisplay code for lines with more than 256 line
    breaks.

u.  A bug was fixed which caused invisible character markers to not be
    stripped from the prompt string if the terminal was in no-echo mode.
    
v.  Readline no longer tries to get the variables it needs for redisplay 
    from the termcap entry if the calling application has specified its
    own redisplay function.  Readline treats the terminal as `dumb' in
    this case.

w.  Fixes to the SIGWINCH code so that a multiple-line prompt with escape
    sequences is redrawn correctly.

x.  Changes to the install and install-shared targets so that the libraries
    and header files are installed separately.

2.  New Features in Readline

a.  A new Readline `user manual' is in doc/rluserman.texinfo.

b.  Parentheses matching is now always compiled into readline, and enabled
    or disabled when the value of the `blink-matching-paren' variable is
    changed.

c.  MS-DOS systems now use ~/_inputrc as the last-ditch inputrc filename.

d.  MS-DOS systems now use ~/_history as the default history file.

e.  history-search-{forward,backward} now leave the point at the end of the
    line when the string to search for is empty, like
    {reverse,forward}-search-history.

f.  history-search-{forward,backward} now leave the last history line found
    in the readline buffer if the second or subsequent search fails.

g.  New function for use by applications:  rl_on_new_line_with_prompt, used
    when an application displays the prompt itself before calling readline().

h.  New variable for use by applications:  rl_already_prompted.  An application
    that displays the prompt itself before calling readline() must set this to
    a non-zero value.

i.  A new variable, rl_gnu_readline_p, always 1.  The intent is that an
    application can verify whether or not it is linked with the `real'
    readline library or some substitute.

j.  Per Bothner's `rlfe' (pronounced `Ralphie') readline front-end program
    is included in the examples subdirectory, though it is not built
    by default.

-------------------------------------------------------------------------------
This document details the changes between this version, readline-4.0,
and the previous version, readline-2.2.

1.  Changes to Readline

a.  The version number is now 4.0, to match the major and minor version
    numbers on the shared readline and history libraries.  Future
    releases will maintain the identical numbering.

b.  Fixed a typo in the `make install' recipe that copied libreadline.a
    to libhistory.old right after installing it.

c.  The readline and history info files are now installed out of the source
    directory if they are not found in the build directory.

d.  The library no longer exports a function named `savestring' -- backwards
    compatibility be damned.

e.  There is no longer any #ifdef SHELL code in the source files.

f.  Some changes were made to the key binding code to fix memory leaks and
    better support Win32 systems.

g.  Fixed a silly typo in the paren matching code -- it's microseconds, not
    milliseconds.

h.  The readline library should be compilable by C++ compilers.

i.  The readline.h public header file now includes function prototypes for
    all readline functions, and some changes were made to fix errors in the
    source files uncovered by the use of prototypes.

j.  The maximum numeric argument is now clamped at 1000000.

k.  Fixes to rl_yank_last_arg to make it behave better.

l.  Fixed a bug in the display code that caused core dumps if the prompt
    string length exceeded 1024 characters.

m.  The menu completion code was fixed to properly insert a single completion
    if there is only one match.

n.  A bug was fixed that caused the display code to improperly display tabs
    after newlines.

o.  A fix was made to the completion code in which a typo caused the wrong
    value to be passed to the function that computed the longest common
    prefix of the list of matches.

p.  The completion code now checks the value of rl_filename_completion_desired,
    which is set by application-supplied completion functions to indicate
    that filename completion is being performed, to decide whether or not to
    call an application-supplied `ignore completions' function.

q.  Code was added to the history library to catch history substitutions
    using `&' without a previous history substitution or search having been
    performed.


2.  New Features in Readline

a.  There is a new script, support/shobj-conf, to do system-specific shared
    object and library configuration.  It generates variables for configure
    to substitute into makefiles.  The README file provides a detailed
    explanation of the shared library creation process.

b.  Shared libraries and objects are now built in the `shlib' subdirectory.
    There is a shlib/Makefile.in to control the build process.  `make shared'
    from the top-level directory is still the right way to build shared
    versions of the libraries.

c.  rlconf.h is now installed, so applications can find out which features
    have been compiled into the installed readline and history libraries.

d.  rlstdc.h is now an installed header file.

e.  Many changes to the signal handling:
        o Readline now catches SIGQUIT and cleans up the tty before returning;
        o A new variable, rl_catch_signals, is available to application writers 
          to indicate to readline whether or not it should install its own
          signal handlers for SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP,
          SIGTTIN, and SIGTTOU;
        o A new variable, rl_catch_sigwinch, is available to application
          writers to indicate to readline whether or not it should install its
          own signal handler for SIGWINCH, which will chain to the calling
          applications's SIGWINCH handler, if one is installed;
        o There is a new function, rl_free_line_state, for application signal
          handlers to call to free up the state associated with the current
          line after receiving a signal;
        o There is a new function, rl_cleanup_after_signal, to clean up the
          display and terminal state after receiving a signal;
        o There is a new function, rl_reset_after_signal, to reinitialize the
          terminal and display state after an application signal handler
          returns and readline continues

f.  There is a new function, rl_resize_terminal, to reset readline's idea of
    the screen size after a SIGWINCH.

g.  New public functions: rl_save_prompt and rl_restore_prompt.  These were
    previously private functions with a `_' prefix.  These functions are
    used when an application wants to write a message to the `message area'
    with rl_message and have the prompt restored correctly when the message
    is erased.

h.  New function hook: rl_pre_input_hook, called just before readline starts
    reading input, after initialization.

i.  New function hook: rl_display_matches_hook, called when readline would
    display the list of completion matches.  The new function
    rl_display_match_list is what readline uses internally, and is available
    for use by application functions called via this hook.

j.  New bindable function, delete-char-or-list, like tcsh.

k.  A new variable, rl_erase_empty_line, which, if set by an application using
    readline, will cause readline to erase, prompt and all, lines on which the
    only thing typed was a newline.

l.  There is a new script, support/shlib-install, to install and uninstall
    the shared readline and history libraries.

m.  A new bindable variable, `isearch-terminators', which is a string
    containing the set of characters that should terminate an incremental
    search without being executed as a command.

n.  A new bindable function, forward-backward-delete-char.

-------------------------------------------------------------------------------
This document details the changes between this version, readline-2.2,
and the previous version, readline-2.1.

1.  Changes to Readline

a.  Added a missing `extern' to a declaration in readline.h that kept
    readline from compiling cleanly on some systems.

b.  The history file is now opened with mode 0600 when it is written for
    better security.

c.  Changes were made to the SIGWINCH handling code so that prompt redisplay
    is done better.

d.  ^G now interrupts incremental searches correctly.

e.  A bug that caused a core dump when the set of characters to be quoted
    when completing words was empty was fixed.

f.  Fixed a problem in the readline test program rltest.c that caused a core
    dump.

g.  The code that handles parser directives in inputrc files now displays
    more error messages.

h.  The history expansion code was fixed so that the appearance of the
    history comment character at the beginning of a word inhibits history
    expansion for that word and the rest of the input line.

i.  The code that prints completion listings now behaves better if one or
    more of the filenames contains non-printable characters.

j.  The time delay when showing matching parentheses is now 0.5 seconds.


2.  New Features in Readline

a.  There is now an option for `iterative' yank-last-arg handline, so a user
    can keep entering `M-.', yanking the last argument of successive history
    lines.

b.  New variable, `print-completions-horizontally', which causes completion
    matches to be displayed across the screen (like `ls -x') rather than up
    and down the screen (like `ls').

c.  New variable, `completion-ignore-case', which causes filename completion
    and matching to be performed case-insensitively.

d.  There is a new bindable command, `magic-space', which causes history
    expansion to be performed on the current readline buffer and a space to
    be inserted into the result.

e.  There is a new bindable command, `menu-complete', which enables tcsh-like
    menu completion (successive executions of menu-complete insert a single
    completion match, cycling through the list of possible completions).

f.  There is a new bindable command, `paste-from-clipboard', for use on Win32
    systems, to insert the text from the Win32 clipboard into the editing
    buffer.

g.  The key sequence translation code now understands printf-style backslash
    escape sequences, including \NNN octal escapes.  These escape sequences
    may be used in key sequence definitions or macro values.

h.  An `$include' inputrc file parser directive has been added.