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This document details the changes between this version, readline-4.0,
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and the previous version, readline-2.2.
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1.  Changes to Readline
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a.  The version number is now 4.0, to match the major and minor version
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    numbers on the shared readline and history libraries.  Future
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    releases will maintain the identical numbering.
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b.  Fixed a typo in the `make install' recipe that copied libreadline.a
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    to libhistory.old right after installing it.
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c.  The readline and history info files are now installed out of the source
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    directory if they are not found in the build directory.
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d.  The library no longer exports a function named `savestring' -- backwards
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    compatibility be damned.
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e.  There is no longer any #ifdef SHELL code in the source files.
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f.  Some changes were made to the key binding code to fix memory leaks and
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    better support Win32 systems.
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g.  Fixed a silly typo in the paren matching code -- it's microseconds, not
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    milliseconds.
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h.  The readline library should be compilable by C++ compilers.
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i.  The readline.h public header file now includes function prototypes for
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    all readline functions, and some changes were made to fix errors in the
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    source files uncovered by the use of prototypes.
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j.  The maximum numeric argument is now clamped at 1000000.
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k.  Fixes to rl_yank_last_arg to make it behave better.
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l.  Fixed a bug in the display code that caused core dumps if the prompt
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    string length exceeded 1024 characters.
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m.  The menu completion code was fixed to properly insert a single completion
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    if there is only one match.
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n.  A bug was fixed that caused the display code to improperly display tabs
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    after newlines.
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o.  A fix was made to the completion code in which a typo caused the wrong
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    value to be passed to the function that computed the longest common
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    prefix of the list of matches.
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p.  The completion code now checks the value of rl_filename_completion_desired,
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    which is set by application-supplied completion functions to indicate
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    that filename completion is being performed, to decide whether or not to
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    call an application-supplied `ignore completions' function.
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q.  Code was added to the history library to catch history substitutions
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    using `&' without a previous history substitution or search having been
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    performed.
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2.  New Features in Readline
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a.  There is a new script, support/shobj-conf, to do system-specific shared
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    object and library configuration.  It generates variables for configure
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    to substitute into makefiles.  The README file provides a detailed
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    explanation of the shared library creation process.
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b.  Shared libraries and objects are now built in the `shlib' subdirectory.
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    There is a shlib/Makefile.in to control the build process.  `make shared'
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    from the top-level directory is still the right way to build shared
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    versions of the libraries.
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c.  rlconf.h is now installed, so applications can find out which features
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    have been compiled into the installed readline and history libraries.
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d.  rlstdc.h is now an installed header file.
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e.  Many changes to the signal handling:
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        o Readline now catches SIGQUIT and cleans up the tty before returning;
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        o A new variable, rl_catch_signals, is available to application writers
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          to indicate to readline whether or not it should install its own
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          signal handlers for SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP,
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          SIGTTIN, and SIGTTOU;
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        o A new variable, rl_catch_sigwinch, is available to application
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          writers to indicate to readline whether or not it should install its
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          own signal handler for SIGWINCH, which will chain to the calling
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          applications's SIGWINCH handler, if one is installed;
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        o There is a new function, rl_free_line_state, for application signal
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          handlers to call to free up the state associated with the current
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          line after receiving a signal;
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        o There is a new function, rl_cleanup_after_signal, to clean up the
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          display and terminal state after receiving a signal;
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        o There is a new function, rl_reset_after_signal, to reinitialize the
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          terminal and display state after an application signal handler
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          returns and readline continues
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f.  There is a new function, rl_resize_terminal, to reset readline's idea of
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    the screen size after a SIGWINCH.
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g.  New public functions: rl_save_prompt and rl_restore_prompt.  These were
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    previously private functions with a `_' prefix.  These functions are
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    used when an application wants to write a message to the `message area'
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    with rl_message and have the prompt restored correctly when the message
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    is erased.
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h.  New function hook: rl_pre_input_hook, called just before readline starts
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    reading input, after initialization.
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i.  New function hook: rl_display_matches_hook, called when readline would
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    display the list of completion matches.  The new function
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    rl_display_match_list is what readline uses internally, and is available
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    for use by application functions called via this hook.
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j.  New bindable function, delete-char-or-list, like tcsh.
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k.  A new variable, rl_erase_empty_line, which, if set by an application using
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    readline, will cause readline to erase, prompt and all, lines on which the
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    only thing typed was a newline.
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l.  There is a new script, support/shlib-install, to install and uninstall
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    the shared readline and history libraries.
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m.  A new bindable variable, `isearch-terminators', which is a string
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    containing the set of characters that should terminate an incremental
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    search without being executed as a command.
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n.  A new bindable function, forward-backward-delete-char.
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-------------------------------------------------------------------------------
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This document details the changes between this version, readline-2.2,
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and the previous version, readline-2.1.
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1.  Changes to Readline
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a.  Added a missing `extern' to a declaration in readline.h that kept
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    readline from compiling cleanly on some systems.
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b.  The history file is now opened with mode 0600 when it is written for
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    better security.
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c.  Changes were made to the SIGWINCH handling code so that prompt redisplay
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    is done better.
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d.  ^G now interrupts incremental searches correctly.
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e.  A bug that caused a core dump when the set of characters to be quoted
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    when completing words was empty was fixed.
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f.  Fixed a problem in the readline test program rltest.c that caused a core
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    dump.
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g.  The code that handles parser directives in inputrc files now displays
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    more error messages.
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h.  The history expansion code was fixed so that the appearance of the
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    history comment character at the beginning of a word inhibits history
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    expansion for that word and the rest of the input line.
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i.  The code that prints completion listings now behaves better if one or
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    more of the filenames contains non-printable characters.
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j.  The time delay when showing matching parentheses is now 0.5 seconds.
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2.  New Features in Readline
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a.  There is now an option for `iterative' yank-last-arg handline, so a user
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    can keep entering `M-.', yanking the last argument of successive history
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    lines.
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b.  New variable, `print-completions-horizontally', which causes completion
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    matches to be displayed across the screen (like `ls -x') rather than up
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    and down the screen (like `ls').
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c.  New variable, `completion-ignore-case', which causes filename completion
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    and matching to be performed case-insensitively.
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d.  There is a new bindable command, `magic-space', which causes history
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    expansion to be performed on the current readline buffer and a space to
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    be inserted into the result.
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e.  There is a new bindable command, `menu-complete', which enables tcsh-like
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    menu completion (successive executions of menu-complete insert a single
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    completion match, cycling through the list of possible completions).
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f.  There is a new bindable command, `paste-from-clipboard', for use on Win32
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    systems, to insert the text from the Win32 clipboard into the editing
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    buffer.
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g.  The key sequence translation code now understands printf-style backslash
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    escape sequences, including \NNN octal escapes.  These escape sequences
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    may be used in key sequence definitions or macro values.
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h.  An `$include' inputrc file parser directive has been added.

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