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version 1.1, 2014/07/30 08:16:45 version 1.1.1.2, 2021/03/17 01:01:01
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   This is a terse description of the new features added to readline-8.1 since
   the release of readline-8.0.
   
   New Features in Readline
   
   a. If a second consecutive completion attempt produces matches where the first
      did not, treat it as a new completion attempt and insert a match as
      appropriate.
   
   b. Bracketed paste mode works in more places: incremental search strings, vi
      overstrike mode, character search, and reading numeric arguments.
   
   c. Readline automatically switches to horizontal scrolling if the terminal has
      only one line.
   
   d. Unbinding all key sequences bound to a particular readline function now
      descends into keymaps for multi-key sequences.
   
   e. rl-clear-display: new bindable command that clears the screen and, if
      possible, the scrollback buffer (bound to emacs mode M-C-l by default).
   
   f. New active mark and face feature: when enabled, it will highlight the text
      inserted by a bracketed paste (the `active region') and the text found by
      incremental and non-incremental history searches. This is tied to bracketed
      paste and can be disabled by turning off bracketed paste.
   
   g. Readline sets the mark in several additional commands.
   
   h. Bracketed paste mode is enabled by default. There is a configure-time
      option (--enable-bracketed-paste-default) to set the default to on or off.
   
   i. Readline tries to take advantage of the more regular structure of UTF-8
      characters to identify the beginning and end of characters when moving
      through the line buffer.
   
   j. The bindable operate-and-get-next command (and its default bindings) are
      now part of readline instead of a bash-specific addition.
   
   k. The signal cleanup code now blocks SIGINT while processing after a SIGINT.  
   
   -------------------------------------------------------------------------------
   This is a terse description of the new features added to readline-8.0 since
   the release of readline-7.0.
   
   New Features in Readline
   
   a. Non-incremental vi-mode search (`N', `n') can search for a shell pattern, as
      Posix specifies (uses fnmatch(3) if available).
   
   b. There are new `next-screen-line' and `previous-screen-line' bindable
      commands, which move the cursor to the same column in the next, or previous,
      physical line, respectively.
   
   c. There are default key bindings for control-arrow-key key combinations.
   
   d. A negative argument (-N) to `quoted-insert' means to insert the next N
      characters using quoted-insert.
   
   e. New public function: rl_check_signals(), which allows applications to
      respond to signals that readline catches while waiting for input using
      a custom read function.
   
   f. There is new support for conditionally testing the readline version in an
      inputrc file, with a full set of arithmetic comparison operators available.
   
   g. There is a simple variable comparison facility available for use within an
      inputrc file. Allowable operators are equality and inequality; string
      variables may be compared to a value; boolean variables must be compared to
      either `on' or `off'; variable names are separated from the operator by
      whitespace.
   
   h. The history expansion library now understands command and process
      substitution and extended globbing and allows them to appear anywhere in a
      word.
   
   i. The history library has a new variable that allows applications to set the
      initial quoting state, so quoting state can be inherited from a previous
      line.
   
   j. Readline now allows application-defined keymap names; there is a new public
      function, rl_set_keymap_name(), to do that.
   
   k. The "Insert" keypad key, if available, now puts readline into overwrite
      mode.
   
   -------------------------------------------------------------------------------
   This is a terse description of the new features added to readline-7.0 since
   the release of readline-6.3.
   
   New Features in Readline
   
   a.  The history truncation code now uses the same error recovery mechansim as
       the history writing code, and restores the old version of the history file
       on error.  The error recovery mechanism handles symlinked history files.
   
   b.  There is a new bindable variable, `enable-bracketed-paste', which enables
       support for a terminal's bracketed paste mode.
   
   c.  The editing mode indicators can now be strings and are user-settable
       (new `emacs-mode-string', `vi-cmd-mode-string' and `vi-ins-mode-string'
       variables).  Mode strings can contain invisible character sequences.
       Setting mode strings to null strings restores the defaults.
   
   d.  Prompt expansion adds the mode string to the last line of a multi-line
       prompt (one with embedded newlines).
   
   e.  There is a new bindable variable, `colored-completion-prefix', which, if
       set, causes the common prefix of a set of possible completions to be
       displayed in color.
   
   f.  There is a new bindable command `vi-yank-pop', a vi-mode version of emacs-
       mode yank-pop.
   
   g.  The redisplay code underwent several efficiency improvements for multibyte
       locales.
   
   h.  The insert-char function attempts to batch-insert all pending typeahead
       that maps to self-insert, as long as it is coming from the terminal.
   
   i.  rl_callback_sigcleanup: a new application function that can clean up and
       unset any state set by readline's callback mode.  Intended to be used
       after a signal.
   
   j.  If an incremental search string has its last character removed with DEL, the
       resulting empty search string no longer matches the previous line.
   
   k.  If readline reads a history file that begins with `#' (or the value of
       the history comment character) and has enabled history timestamps, the history
       entries are assumed to be delimited by timestamps.  This allows multi-line
       history entries.
   
   l.  Readline now throws an error if it parses a key binding without a terminating
       `:' or whitespace.
   
   m.  The default binding for ^W in vi mode now uses word boundaries specified
       by Posix (vi-unix-word-rubout is bindable command name).
   
   n.  rl_clear_visible_line: new application-callable function; clears all
       screen lines occupied by the current visible readline line.
   
   o.  rl_tty_set_echoing: application-callable function that controls whether
       or not readline thinks it is echoing terminal output.
   
   p.  Handle >| and strings of digits preceding and following redirection
       specifications as single tokens when tokenizing the line for history
       expansion.
   
   q.  Fixed a bug with displaying completions when the prefix display length
       is greater than the length of the completions to be displayed.
   
   r.  The :p history modifier now applies to the entire line, so any expansion
       specifying :p causes the line to be printed instead of expanded.
   
   s.  New application-callable function: rl_pending_signal(): returns the signal
       number of any signal readline has caught but not yet handled.
       
   t.  New application-settable variable: rl_persistent_signal_handlers: if set
       to a non-zero value, readline will enable the readline-6.2 signal handler
       behavior in callback mode: handlers are installed when
       rl_callback_handler_install is called and removed removed when a complete
       line has been read.
   
   -------------------------------------------------------------------------------
 This is a terse description of the new features added to readline-6.3 since  This is a terse description of the new features added to readline-6.3 since
 the release of readline-6.2.  the release of readline-6.2.
   
Line 55  m.  If the user-settable variable `history-size' is se Line 218  m.  If the user-settable variable `history-size' is se
 n.  New application-settable variable: rl_signal_event_hook; function that is  n.  New application-settable variable: rl_signal_event_hook; function that is
     called when readline is reading terminal input and read(2) is interrupted      called when readline is reading terminal input and read(2) is interrupted
     by a signal.  Currently not called for SIGHUP or SIGTERM.      by a signal.  Currently not called for SIGHUP or SIGTERM.
   
   -------------------------------------------------------------------------------
   This is a terse description of the new features added to readline-6.2 since
   the release of readline-6.1.
   
   a.  The history library does not try to write the history filename in the
       current directory if $HOME is unset.  This closes a potential security
       problem if the application does not specify a history filename.
   
   b.  New bindable variable `completion-display-width' to set the number of
       columns used when displaying completions.
   
   c.  New bindable variable `completion-case-map' to cause case-insensitive
       completion to treat `-' and `_' as identical.
   
   d.  There are new bindable vi-mode command names to avoid readline's case-
       insensitive matching not allowing them to be bound separately.
   
   e.  New bindable variable `menu-complete-display-prefix' causes the menu
       completion code to display the common prefix of the possible completions
       before cycling through the list, instead of after.
   
   -------------------------------------------------------------------------------
   This is a terse description of the new features added to readline-6.1 since
   the release of readline-6.0.
   
   New Features in Readline
   
   a.  New bindable function: menu-complete-backward.
   
   b.  In the vi insertion keymap, C-n is now bound to menu-complete by default,
       and C-p to menu-complete-backward.
   
   c.  When in vi command mode, repeatedly hitting ESC now does nothing, even
       when ESC introduces a bound key sequence.  This is closer to how
       historical vi behaves.
   
   d.  New bindable function: skip-csi-sequence.  Can be used as a default to
       consume key sequences generated by keys like Home and End without having
       to bind all keys.
   
   e.  New application-settable function: rl_filename_rewrite_hook.  Can be used
       to rewite or modify filenames read from the file system before they are
       compared to the word to be completed.
   
   f.  New bindable variable: skip-completed-text, active when completing in the
       middle of a word.  If enabled, it means that characters in the completion
       that match characters in the remainder of the word are "skipped" rather
       than inserted into the line.
   
   g.  The pre-readline-6.0 version of menu completion is available as
       "old-menu-complete" for users who do not like the readline-6.0 version.
   
   h.  New bindable variable: echo-control-characters.  If enabled, and the
       tty ECHOCTL bit is set, controls the echoing of characters corresponding
       to keyboard-generated signals.
   
   i.  New bindable variable: enable-meta-key.  Controls whether or not readline
       sends the smm/rmm sequences if the terminal indicates it has a meta key
       that enables eight-bit characters.
   
   -------------------------------------------------------------------------------
   This is a terse description of the new features added to readline-6.0 since
   the release of readline-5.2.
   
   New Features in Readline
   
   a.  A new variable, rl_sort_completion_matches; allows applications to inhibit
       match list sorting (but beware: some things don't work right if
       applications do this).
   
   b.  A new variable, rl_completion_invoking_key; allows applications to discover
       the key that invoked rl_complete or rl_menu_complete.
   
   c.  The functions rl_block_sigint and rl_release_sigint are now public and
       available to calling applications who want to protect critical sections
       (like redisplay).
   
   d.  The functions rl_save_state and rl_restore_state are now public and
       available to calling applications; documented rest of readline's state
       flag values.
   
   e.  A new user-settable variable, `history-size', allows setting the maximum
       number of entries in the history list.
   
   f.  There is a new implementation of menu completion, with several improvements
       over the old; the most notable improvement is a better `completions
       browsing' mode.
   
   g.  The menu completion code now uses the rl_menu_completion_entry_function
       variable, allowing applications to provide their own menu completion
       generators.
   
   h.  There is support for replacing a prefix  of a pathname with a `...' when
       displaying possible completions.  This is controllable by setting the
       `completion-prefix-display-length' variable.  Matches with a common prefix
       longer than this value have the common prefix replaced with `...'.
   
   i.  There is a new `revert-all-at-newline' variable.  If enabled, readline will
       undo all outstanding changes to all history lines when `accept-line' is
       executed.
   
   -------------------------------------------------------------------------------
   This is a terse description of the new features added to readline-5.2 since
   the release of readline-5.1.
   
   New Features in Readline
   
   a.  Calling applications can now set the keyboard timeout to 0, allowing
       poll-like behavior.
   
   b.  The value of SYS_INPUTRC (configurable at compilation time) is now used as
       the default last-ditch startup file.
   
   c.  The history file reading functions now allow windows-like \r\n line
       terminators.
   
   -------------------------------------------------------------------------------
   This is a terse description of the new features added to readline-5.1 since
   the release of readline-5.0.
   
   New Features in Readline
   
   a.  The key sequence sent by the keypad `delete' key is now automatically   
       bound to delete-char.
   
   b.  A negative argument to menu-complete now cycles backward through the
       completion list.
   
   c.  A new bindable readline variable:  bind-tty-special-chars.  If non-zero,
       readline will bind the terminal special characters to their readline
       equivalents when it's called (on by default).
   
   d.  New bindable command: vi-rubout.  Saves deleted text for possible  
       reinsertion, as with any vi-mode `text modification' command; `X' is bound
       to this in vi command mode.
   
   e.  If the rl_completion_query_items is set to a value < 0, readline never
       asks the user whether or not to view the possible completions.
   
   f.  New application-callable auxiliary function, rl_variable_value, returns
       a string corresponding to a readline variable's value.
   
   g.  When parsing inputrc files and variable binding commands, the parser
       strips trailing whitespace from values assigned to boolean variables
       before checking them.
   
   h.  A new external application-controllable variable that allows the LINES
       and COLUMNS environment variables to set the window size regardless of
       what the kernel returns.
   
   
   -------------------------------------------------------------------------------
   This is a terse description of the new features added to readline-5.0 since
   the release of readline-4.3.
   
   New Features in Readline
   
   a.  History expansion has a new `a' modifier equivalent to the `g' modifier
       for compatibility with the BSD csh.
   
   b.  History expansion has a new `G' modifier equivalent to the BSD csh `g'
       modifier, which performs a substitution once per word.
   
   c.  All non-incremental search operations may now undo the operation of
       replacing the current line with the history line.
   
   d.  The text inserted by an `a' command in vi mode can be reinserted with
       `.'.
   
   e.  New bindable variable, `show-all-if-unmodified'.  If set, the readline
       completer will list possible completions immediately if there is more
       than one completion and partial completion cannot be performed.
   
   f.  There is a new application-callable `free_history_entry()' function.
   
   g.  History list entries now contain timestamp information; the history file
       functions know how to read and write timestamp information associated
       with each entry.
   
   h.  Four new key binding functions have been added:
   
           rl_bind_key_if_unbound()
           rl_bind_key_if_unbound_in_map()
           rl_bind_keyseq_if_unbound()
           rl_bind_keyseq_if_unbound_in_map()
   
   i.  New application variable, rl_completion_quote_character, set to any
       quote character readline finds before it calls the application completion
       function.
   
   j.  New application variable, rl_completion_suppress_quote, settable by an   
       application completion function.  If set to non-zero, readline does not
       attempt to append a closing quote to a completed word.
       
   k.  New application variable, rl_completion_found_quote, set to a non-zero
       value if readline determines that the word to be completed is quoted.
       Set before readline calls any application completion function.
   
   l.  New function hook, rl_completion_word_break_hook, called when readline
       needs to break a line into words when completion is attempted.  Allows
       the word break characters to vary based on position in the line.
   
   m.  New bindable command: unix-filename-rubout.  Does the same thing as
       unix-word-rubout, but adds `/' to the set of word delimiters.
   
   n.  When listing completions, directories have a `/' appended if the
       `mark-directories' option has been enabled.
Removed from v.1.1  
changed lines
  Added in v.1.1.1.2

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