CHANGES FROM 2.0 to 2.1 18 October 2015

Incompatible Changes
====================

* Mouse-mode has been rewritten.  There's now no longer options for:
	- mouse-resize-pane
	- mouse-select-pane
	- mouse-select-window
	- mode-mouse

  Instead there is just one option:  'mouse' which turns on mouse support
  entirely.
* 'default-terminal' is now a session option.  Furthermore, if this is set
  to 'screen-*' then emulate what screen does.  If italics are wanted, this
  can be set to 'tmux' but this is still new and not necessarily supported
  on all platforms with older ncurses installs.
* The c0-* options for rate-limiting have been removed.  Instead, a backoff
  approach is used.

Normal Changes
==============

* New formats:
	- session_activity
	- window_linked
	- window_activity_format
	- session_alerts
	- session_last_attached
	- client_pid
	- pid
* 'copy-selection', 'append-selection', 'start-named-buffer' now understand
  an '-x' flag to prevent it exiting copying mode.
* 'select-pane' now understands '-P' to set window/pane background colours.
* 'renumber-windows' now understands windows which are unlinked.
* 'bind' now understands multiple key tables.  Allows for key-chaining.
* 'select-layout' understands '-o' to undo the last layout change.
* The environment is updated when switching sessions as well as attaching.
* 'select-pane' now understands '-M' for marking a pane.  This marked pane
  can then be used with commands which understand src-pane specifiers
  automatically.
* If a session/window target is prefixed with '=' then only an exact match
  is considered.
* 'move-window' understands '-a'.
* 'update-environment' understands '-E' when attach-session is used on an
  already attached client.
* 'show-environment' understands '-s' to output Bourne-compatible commands.
* New option: 'history-file' to save/restore command prompt history.
* Copy mode is exited if the history is cleared whilst in copy-mode.
* 'copy-mode' learned '-e' to exit copy-mode when scrolling to end.

CHANGES FROM 1.9a to 2.0 6 March 2015

Incompatible Changes
====================

* The choose-list command has been removed.
* 'terminal-overrides' is now a server option, not a session option.
* 'message-limit' is now a server option, not a session option.
* 'monitor-content' option has been removed.
* 'pane_start_path' option has been removed.
* The "info" mechanism which used to (for some commands) provide feedback
  has been removed, and like other commands, they now produce nothing on
  success.

Normal Changes
==============

* tmux can now write an entry to utmp if the library 'utempter' is present
  at compile time.
* set-buffer learned append mode (-a), and a corresponding
  'append-selection' command has been added to copy-mode.
* choose-mode now has the following commands which can be bound:
	- start-of-list
	- end-of-list
	- top-line
	- bottom-line

* choose-buffer now understands UTF-8.
* Pane navigation has changed:
	- The old way of always using the top or left if the choice is ambiguous.
	- The new way of remembering the last used pane is annoying if the
	  layout is balanced and the leftmost is obvious to the user (because
	  clearly if we go right from the top-left in a tiled set of four we want
	  to end up in top-right, even if we were last using the bottom-right).

      So instead, use a combination of both: if there is only one possible
      pane alongside the current pane, move to it, otherwise choose the most
      recently used of the choice.
* 'set-buffer' can now be told to give names to buffers.
* The 'new-session', 'new-window', 'split-window', and 'respawn-pane' commands
  now understand multiple arguments and handle quoting problems correctly.
* 'capture-pane' understands '-S-' to mean the start of the pane, and '-E-' to
  mean the end of the pane.
* Support for function keys beyond F12 has changed.  The following explains:
	- F13-F24 are S-F1 to S-F12
	- F25-F36 are C-F1 to C-F12
	- F37-F48 are C-S-F1 to C-S-F12
	- F49-F60 are M-F1 to M-F12
	- F61-F63 are M-S-F1 to M-S-F3

 Therefore, F13 becomes a binding of S-F1, etc.
* Support using pane id as part of session or window specifier (so % means
  session-of-%1 or window-of-%1) and window id as part of session
  (so @1 means session-of-@1).
* 'copy-pipe' command now understands formats via -F
* 'if-shell'  command now understands formats via -F
* 'split-window' and 'join-window' understand -b to create the pane to the left
  or above the target pane.

CHANGES FROM 1.9 to 1.9a 22 February 2014

NOTE:  This is a bug-fix release to address some important bugs which just
missed the 1.9 deadline, but were found afterwards.

Normal Changes
==============

* Fix crash due to uninitialized lastwp member of layout_cell
* Fix -fg/-bg/-style with 256 colour terminals.  

CHANGES FROM 1.8 to 1.9, 20 February 2014

NOTE:  This release has bumped the tmux protocol version.  It is therefore
advised that the prior tmux server is restarted when this version of tmux is
installed, to avoid protocol mismatch errors for newer clients trying to
talk to an older running tmux server.

Incompatible Changes
====================

* 88 colour support has been removed.
* 'default-path' has been removed.  The new-window command accepts '-c' to
  cater for this.  The previous value of "." can be replaced with: 'neww -c
  $PWD', the previous value of '' which meant current path of the pane can
  be specified as:  'neww -c "#{pane_current_path}"'

Deprecated Changes
==================

* The single format specifiers:  #A -> #Z (where defined) have been
  deprecated and replaced with longer-named equivalents, as listed in the
  FORMATS section of the tmux manpage.
* The various foo-{fg,bg,attr} commands have been deprecated and replaced
  with equivalent foo-style option instead.  Currently this is still
  backwards-compatible, but will be removed over time.

Normal Changes
==============

* A new environment variable TMUX_TMPDIR is now honoured, allowing the
  socket directory to be set outside of TMPDIR (/tmp/ if not set).
* If -s not given to swap-pane the current pane is assumed.
* A #{pane_syncronized} format specifier has been added to be a conditional
  format if a pane is in a syncronised mode (c.f. syncronize-panes)
* Tmux now runs under Cygwin natively.
* Formats can now be nested within each other and expanded accordingly.
* Added 'automatic-rename-format' option to allow the automatic rename
  mechanism to use something other than the default of
  #{pane_current_command}.
* new-session learnt '-c' to specify the starting directory for that session
  and all subsequent windows therein.
* The session name is now shown in the message printed to the terminal when
  a session is detached.
* Lots more format specifiers have been added.
* Server race conditions have been fixed; in particular commands are not run
  until after the configuration file is read completely.
* Case insensitive searching in tmux's copy-mode is now possible.
* attach-session and switch-client learnt the '-t' option to accept a window
  and/or a pane to use.
* Copy-mode is only exited if no selection is in progress.
* Paste key in copy-mode is now possible to enter text from the clipboard.
* status-interval set to '0' now works as intended.
* tmux now supports 256 colours running under fbterm.
* Many bug fixes!

CHANGES FROM 1.7 to 1.8, 26 March 2013

Incompatible Changes
====================

* layout redo/undo has been removed.

Normal Changes
==============

* Add halfpage up/down bindings to copy mode.
* Session choosing fixed to work with unattached sessions.
* New window options window-status-last-{attr,bg,fg} to denote the last
  window which was active.
* Scrolling in copy-mode now scrolls the region without moving the mouse
  cursor.
* run-shell learnt '-t' to specify the pane to use when displaying output.
* Support for middle-click pasting.
* choose-tree learns '-u' to start uncollapsed.
* select-window learnt '-T' to toggle to the last window if it's already
  current.
* New session option 'assume-paste-time' for pasting text versus key-binding
  actions.
* choose-* commands now work outside of an attached client.
* Aliases are now shown for list-commands command.
* Status learns about formats.
* Free-form options can be set with set-option if prepended with an '@'
  sign.
* capture-pane learnt '-p' to send to stdout, and '-e' for capturing escape
  sequences, and '-a' to capture the alternate screen, and '-P' to dump
  pending output.
* Many new formats added (client_session, client_last_session, etc.)
* Control mode, which is a way for a client to send tmux commands.
  Currently more useful to users of iterm2.
* resize-pane learnt '-x' and '-y' for absolute pane sizing.
* Config file loading now reports errors from all files which are loaded via
  the 'source-file' command.
* 'copy-pipe' mode command to copy selection and pipe the selection to a
  command.
* Panes can now emit focus notifications for certain applications
  which use those.
* run-shell and if-shell now accept formats.
* resize-pane learnt '-Z' for zooming a pane temporarily.
* new-session learnt '-A' to make it behave like attach-session.
* set-option learnt '-o' to prevent setting an option which is already set.
* capture-pane and show-options learns '-q' to silence errors.
* New command 'wait-for' which blocks a client until woken up again.
* Resizing panes will now reflow the text inside them.
* Lots and lots of bug fixes, fixing memory-leaks, etc.
* Various manpage improvements.

CHANGES FROM 1.6 to 1.7, 13 October 2012

* tmux configuration files now support line-continuation with a "\" at the
  end of a line.
* New option status-position to move the status line to the top or bottom of
  the screen.
* Enforce history-limit option when clearing the screen.
* Give each window a unique id, like panes but prefixed with @.
* Add pane id to each pane in layout description (while still accepting
  the old form).
* Provide defined ways to set the various default-path possibilities: ~
  for home directory, . for server start directory, - for session start
  directory and empty for the pane's working directory (the default). All
  can also be used as part of a relative path (eg -/foo). Also provide -c
  flags to neww and splitw to override default-path setting.
* Add -l flag to send-keys to send input literally (without translating
  key names).
* Allow a single option to be specified to show-options to show just that
  option.
* New command "move-pane" (like join-pane but allows the same window).
* join-pane and move-pane commands learn "-b" option to place the pane to
  the left or above.
* Support for bracketed-paste mode.
* Allow send-keys command to accept hex values.
* Add locking around "start-server" to avoid race-conditions.
* break-pane learns -P/-F arguments for display formatting.
* set-option learns "-q" to make it quiet, and not print out anything.
* copy mode learns "wrap-search" option.
* Add a simple form of output rate limiting by counting the number of
  certain C0 sequences (linefeeds, backspaces, carriage returns) and if it
  exceeds a threshold (current default 250/millisecond), start to redraw
  the pane every 100 milliseconds instead of making each change as it
  comes. Two configuration options - c0-change-trigger and
  c0-change-interval.
* find-window learns new flags:  "-C", "-N", "-T" to match against either or
  all of a window's content, name, or title.  Defaults to all three options
  if none specified.
* find-window automatically selects the appropriate pane for the found
  matches.
* show-environment can now accept one option to show that environment value.
* Exit mouse mode when end-of-screen reached when scrolling with the mouse
  wheel.
* select-layout learns -u and -U for layout history stacks.
* kill-window, detach-client, kill-session all  learn "-a" option for
  killing all but the current thing specified.
* move-window learns "-r" option to renumber window sequentially in a
  session.
* New session option "renumber-windows" to automatically renumber windows in
  a session when a window is closed.  (see "move-window -r").
* Only enter copy-mode on scroll up.
* choose-* and list-* commands all use "-F" for format specifiers.
* When spawning external commands, the value from the "default-shell" option
  is now used, rather than assuming /bin/sh.
* New choose-tree command to render window/sessions as a tree for selection.
* display-message learns new format options.
* For linked-windows across sessions, all flags for that window are now
  cleared across sessions.
* Lots and lots of bug fixes, fixing memory-leaks, etc.
* Various manpage improvements.

CHANGES FROM 1.5 TO 1.6, 23 January 2012

* Extend the mode-mouse option to add a third choice which means the mouse
  does not enter copy mode.
* Add a -r flag to switch-client to toggle the client read-only flag.
* Add pane-base-index option.
* Support \ for line continuation in the configuration file.
* Framework for more powerful formatting of command output and use it for
  list-{panes,windows,sessions}. This allows more descriptive replacements
  (such as #{session_name}) and conditionals.
* Mark dead panes with some text saying they are dead.
* Reject $SHELL if it is not a full path.
* Add -S option to refresh-client to redraw status line.
* Add an else clause for if-shell.
* Try to resolve relative paths for loadb and saveb (first, using client
  working directory, if any, then default-path or session working directory).
* Support for \e[3J to clear the history and send the corresponding
  terminfo code (E3) before locking.
* When in copy mode, make repeat count indicate buffer to replace, if used.
* Add screen*:XT to terminal-overrides for tmux-in-tmux.
* Status-line message attributes added.
* Move word-separators to be a session rather than window option.
* Change the way the working directory for new processes is discovered. If
  default-path isn't empty, it is used. Otherwise, if a new window is created
  from the command-line, the working directory of the client is used. If not,
  platform specific code is used to retrieve the current working directory
  of the process in the active pane. If that fails, the directory where the
  session was created is used, instead.
* Do not change the current pane if both mouse-select-{pane,window} are
  enabled.
* Add \033[s and \033[u to save and restore cursor position.
* Allow $HOME to be used as default-path.
* Add CNL and CPL escape sequences.
* Calculate last position correctly for UTF-8 wide characters.
* Add an option allow-rename to disable the window rename escape sequence.
* Attributes for each type of status-line alert (ie bell, content and
  activity) added. Therefore, remove the superfluous options
  window-status-alert-{attr,bg,fg}.
* Add a -R flag to send-keys to reset the terminal.
* Add strings to allow the aixterm bright colours to be used when
  configuring colours.
* Drop the ability to have a list of keys in the prefix in favour of two
  separate options, prefix and prefix2.
* Flag -2 added to send-prefix to send the secondary prefix key.
* Show pane size in top right of display panes mode.
* Some memory leaks plugged.
* More command-prompt editing improvements.
* Various manpage improvements.
* More Vi mode improvements.

CHANGES FROM 1.4 TO 1.5, 09 July 2011

* Support xterm mouse modes 1002 and 1003.
* Change from a per-session stack of buffers to one global stack. This renders
  copy-buffer useless and makes buffer-limit now a server option.
* Fix most-recently-used choice by avoiding reset the activity timer for
  unattached sessions every second.
* Add a -P option to new-window and split-window to print the new window or
  pane index in target form (useful to pass it into other commands).
* Handle a # at the end of a replacement string (such as status-left)
  correctly.
* Support for UTF-8 mouse input (\033[1005h) which was added in xterm 262.
  If the new mouse-utf8 option is on, UTF-8 mouse input is enabled for all
  UTF-8 terminals. The option defaults to on if LANG etc are set in the same
  manner as the utf8 option.
* Support for HP-UX.
* Accept colours of the hex form #ffffff and translate to the nearest from the
  xterm(1) 256-colour set.
* Clear the non-blocking IO flag (O_NONBLOCK) on the stdio file descriptors
  before closing them (fixes things like "tmux ls && cat").
* Use TMPDIR if set.
* Fix next and previous session functions to actually work.
* Support -x and -y for new-session to specify the initial size of the window
  if created detached with -d.
* Make bind-key accept characters with the top-bit-set and print them as octal.
* Set $TMUX without the session when background jobs are run.
* Simplify the way jobs work and drop the persist type, so all jobs are
  fire-and-forget.
* Accept tcgetattr/tcsetattr(3) failure, fixes problems with fatal() if the
  terminal disappears while locked.
* Add a -P option to detach to HUP the client's parent process (usually causing
  it to exit as well).
* Support passing through escape sequences to the underlying terminal by using
  DCS with a "tmux;" prefix.
* Prevent tiled producing a corrupt layout when only one column is needed.
* Give each pane created in a tmux server a unique id (starting from 0), put it
  in the TMUX_PANE environment variable and accept it as a target.
* Allow a start and end line to be specified for capture-pane which may be
  negative to capture part of the history.
* Add -a and -s options to lsp to list all panes in the server or session
  respectively. Likewise add -s to lsw.
* Change -t on display-message to be target-pane for the #[A-Z] replacements
  and add -c as target-client.
* The attach-session command now prefers the most recently used unattached
  session.
* Add -s option to detach-client to detach all clients attached to a session.
* Add -t to list-clients.
* Change window with mouse wheel over status line if mouse-select-window is on.
* When mode-mouse is on, automatically enter copy mode when the mouse is
  dragged or the mouse wheel is used. Also exit copy mode when the mouse wheel
  is scrolled off the bottom.
* Provide #h character pair for short hostname (no domain).
* Don't use strnvis(3) for the title as it breaks UTF-8.
* Use the tsl and fsl terminfo(5) capabilities to update terminal title and
  automatically fill them in on terminals with the XT capability (which means
  their title setting is xterm-compatible).
* Add a new option, mouse-resize-pane. When on, panes may be resized by
  dragging their borders.
* Fix crash by resetting last pane on {break,swap}-pane across windows.
* Add three new copy-mode commands - select-line, copy-line, copy-end-of-line.
* Support setting the xterm clipboard when copying from copy mode using the
  xterm escape sequence for the purpose (if xterm is configured to allow it).
* Support xterm(1) cursor colour change sequences through terminfo(5) Cc
  (set) and Cr (reset) extensions.
* Support DECSCUSR sequence to set the cursor style with two new terminfo(5)
  extensions, Cs and Csr.
* Make the command-prompt custom prompts recognize the status-left option
  character pairs.
* Add a respawn-pane command.
* Add a couple of extra xterm-style keys that gnome terminal provides.
* Allow the initial context on prompts to be set with the new -I option to
  command-prompt. Include the current window and session name in the prompt
  when renaming and add a new key binding ($) for rename session.
* Option bell-on-alert added to trigger the terminal bell when there is an
  alert.
* Change the list-keys format so that it shows the keys using actual tmux
  commands which should be able to be directly copied into the config file.
* Show full targets for lsp/lsw -a.
* Make confirm-before prompt customizable with -p option like command-prompt
  and add the character pairs #W and #P to the default kill-{pane,window}
  prompts.
* Avoid sending data to suspended/locked clients.
* Small memory leaks in error paths plugged.
* Vi mode improvements.

CHANGES FROM 1.3 TO 1.4, 27 December 2010

* Window bell reporting fixed.
* Show which pane is active in the list-panes output.
* Backoff reworked.
* Prevent the server from dying when switching into copy mode when already
  in a different mode.
* Reset running jobs when the status line is enabled or disabled.
* Simplify xterm modifier detection.
* Avoid crashing in copy mode if the screen size is too small for the
  indicator.
* Flags -n and -p added to switch-client.
* Use UTF-8 line drawing characters on UTF-8 terminals, thus fixing some
  terminals (eg putty) which disable the vt100 ACS mode switching sequences
  in UTF-8 mode. On terminals without ACS, use ASCII equivalents.
* New server option exit-unattached added.
* New session option destroy-unattached added.
* Fall back on normal session choice method if $TMUX exists but is invalid
  rather than rejecting.
* Mark repeating keys with "(repeat)" in the key list.
* When removing a pane, don't change the active pane unless the active pane
  is actually the one being removed.
* New command last-pane added.
* AIX fixes.
* Flag -a added to unbind-key.
* Add XAUTHORITY to update-environment.
* More info regarding window and pane flags is now shown in list-*.
* If VISUAL or EDITOR contains "vi" configure mode-keys and status-key to vi.
* New window option monitor-silence and session option visual-silence added.
* In the built-in layouts distribute the panes more evenly.
* Set the default value of main-pane-width to 80 instead of 81.
* Command-line flag -V added.
* Instead of keeping a per-client prompt history make it global.
* Fix rectangle copy to behave like emacs (the cursor is not part of the
  selection on the right edge but on the left it is).
* Flag -l added to switch-client.
* Retrieve environment variables from the global environment rather than
  getenv(3), thus allowing them to be updated during the configuration file.
* New window options other-pane-{height,width} added.
* More minor bugs fixed and manpage improvements.

CHANGES FROM 1.2 TO 1.3, 18 July 2010

* New input parser.
* Flags to move through panes -UDLR added to select-pane.
* Commands up-pane, and down-pane removed, since equivalent behaviour is now
  available through the target flag (-t:+ and -t:-).
* Jump-forward/backward in copy move (based on vi's F, and f commands).
* Make paste-buffer accept a pane as a target.
* Flag -a added to new-window to insert a window after an existing one, moving
  windows up if necessary.
* Merge more mode into copy mode.
* Run job commands explicitly in the global environment (which can be modified
  with setenv -g), rather than with the environment tmux started with.
* Use the machine's hostname as the default title, instead of an empty string.
* Prevent double free if the window option remain-on-exit is set. 
* Key string conversions rewritten.
* Mark zombie windows as dead in the choose-window list.
* Tiled layout added.
* Signal handling reworked.
* Reset SIGCHLD after fork to fix problems with some shells.
* Select-prompt command removed. Therefore, bound ' to command-prompt -p index
  "select-window -t:%%" by default.
* Catch SIGHUP and terminate if running as a client, thus avoiding clients from
  being left hanging around when, for instance, a SSH session is disconnected.
* Solaris 9 fixes (such as adding compat {get,set}env(3) code).
* Accept none instead of default for attributes.
* Window options window-status-alert-{alert,bg,fg} added.
* Flag -s added to the paste-buffer command to specify a custom separator.
* Allow dragging to make a selection in copy mode if the mode-mouse option is
  set.
* Support the mouse scroll wheel.
* Make pipe-pane accept special character sequences (eg #I).
* Fix problems with window sizing when starting tmux from .xinitrc.
* Give tmux sockets (but not the containing folder) group permissions.
* Extend the target flags (ie -t) to accept an offset (for example -t:+2), and
  make it wrap windows, and panes.
* New command choose-buffer added.
* New server option detach-on-destroy to set what happens to a client when the
  session it is attached to is destroyed. If on (default), the client is
  detached. Otherwise, the client is switched to the most recently active of
  the remaining sessions.
* The commands load-buffer, and save-buffer now accept a dash (-) as the file
  to read from stdin, or write to stdout.
* Custom layouts added.
* Additional code reduction, bug fixes, and manpage enhancements.

CHANGES FROM 1.1 TO 1.2, 10 March 2010

* Switch to libevent.
* Emulate the ri (reverse index) capability, ergo allowing tmux to at least
  start on Sun consoles (TERM=sun, or sun-color).
* Assign each entry a number, or lowercase letter in choose mode, and accept
  that as a shortcut key.
* Permit top-bit-set characters to be entered in the status line.
* Mark no-prefix keys with (no prefix), rather than [] in list-keys.
* New command show-messages (alias showmsgs), and new session option
  message-limit, to show a per-client log of status lines messages up to the
  number defined by message-limit.
* Do not interpret #() for display-message to avoid leaking commands.
* New window options window-status-format, and window-status-current-format to
  control the format of each window in the status line.
* Add a -p flag to display-message to print the output, instead of displaying
  it in the status line.
* Emulate il1, dl1, ich1 to run with vt100 feature set.
* New command capture-pane (alias capturep) to copy the entire pane contents
  to a paste buffer.
* Avoid duplicating code by adding a -w flag to set-option, and show-options to
  set, and show window options. The commands set-window-option, and
  show-window-options are now aliases.
* Panes can now be referred to as top, bottom, top-left, etc.
* Add server-wide options, which can be set with set-option -s, and shown with
  show-options -s.
* New server option quiet (like -q from the command line).
* New server option escape-time to set the timeout used to detect if escapes
  are alone, part of a function key, or meta sequence.
* New session options pane-active-border-bg, pane-active-border-fg,
  pane-border-bg, and pane-border-fg to set pane colours.
* Make split-window accept a pane target, instead of a window.
* New command join-pane (alias joinp) to split, and move an existing pane into
  the space (the opposite of break-pane), thus simplifying calls to
  split-window, followed by move-window.
* Permit S- prefix on keys for shift when the terminal/terminfo supports them.
* Window targets (-t flag) can now refer to the last window (!), next (+), and
  previous (-) window by number.
* Mode keys to jump to the bottom/top of history, end of the next word, scroll
  up/down, and reverse search in copy mode.
* New session option display-panes-active-colour to display the active pane in
  a different colour with the display-panes command.
* Read the socket path from $TMUX if it's present, and -L, and -S are not
  given.
* Vi-style mode keys B, W, and E to navigate between words in copy mode.
* Start in more mode when configuration file errors are detected.
* Rectangle copy support added.
* If attach-session was specified with the -r flag, make the client read-only.
* Per-window alternate-screen option.
* Make load-buffer work with FIFOs.
* New window option word-separators to set the characters considered as word
  separators in copy mode.
* Permit keys in copy mode to be prefixed by a repeat count, entered with [1-9]
  in vi mode, or M-[1-9] in emacs mode.
* utf8 improvements.
* As usual, additional code reduction, bug fixes, and manpage enhancements.

CHANGES FROM 1.0 TO 1.1, 05 November 2009

* New run-shell (alias run) command to run an external command without a
  window, capture it's stdout, and send it to output mode.
* Ability to define multiple prefix keys.
* Internal locking mechanism removed. Instead, detach each client and run the
  external command specified in the new session option lock-command (by default
  lock -np), thus allowing the system password to be used.
* set-password command, and -U command line flag removed per the above change.
* Add support for -c command line flag to execute a shell command.
* New lock-client (alias lockc), and lock-session (alias locks) commands to
  lock a particular client, or all clients attached to a session.
* Support C-n/C-p/C-v/M-v with emacs keys in choice mode.
* Use : for goto line rather than g in vi mode. 
* Try to guess which client to use when no target client was specified. Finds
  the current session, and if only one client is present, use it. Otherwise,
  return the most recently used client.
* Make C-Down/C-Up in copy mode scroll the screen down/up one line without
  moving the cursor.
* Scroll mode superseded by copy mode.
* New synchronize-panes window option to send all input to all other panes in
  the same window.
* New lock-server session option to lock, when off (on by default), each
  session when it has been idle for the lock-after-time setting. When on, the
  entire server locks when all sessions have been idle for their individual
  lock-after-time setting.
* Add support for grouped sessions which have independent name, options,
  current window, but where the linked windows are synchronized (ie creating,
  killing windows are mirrored between the sessions). A grouped session may be
  created by passing -t to new-session.
* New mouse-select-pane session option to select the current pane with the
  mouse.
* Queue, and run commands in the background for if-shell, status-left,
  status-right, and #() by starting each once every status-interval. Adds the
  capability to call some programs which would previously cause the server to
  hang (eg sleep/tmux). It also avoids running commands excessively (ie if used
  multiple times, it will be run only once).
* When a window is zombified and automatic-rename is on, append [dead] to the
  name.
* Split list-panes (alias lsp) off from list-windows.
* New pipe-pane (alias pipep) to redirect a pane output to an external command.
* Support for automatic-renames for Solaris.
* Permit attributes to be turned off in #[] by prefixing with no (eg nobright).
* Add H/M/L in vi mode, and M-R/M-r in emacs to move the cursor to the top,
  middle, and bottom of the screen.
* -a option added to kill-pane to kill all except current pane.
* The -d command line flag is now gone (can be replaced by terminal-overrides).
  Just use op/AX to detect default colours.
* input/tty/utf8 improvements.
* xterm-keys rewrite.
* Additional code reduction, and bug fixes.

CHANGES FROM 0.9 TO 1.0, 20 Sept 2009

* Option to alter the format of the window title set by tmux.
* Backoff for a while after multiple incorrect password attempts.
* Quick display of pane numbers (C-b q).
* Better choose-window, choose-session commands and a new choose-client command.
* Option to request multiple responses when using command-prompt.
* Improved environment handling.
* Combine wrapped lines when pasting.
* Option to override terminal settings (terminal-overrides).
* Use the full range of ACS characters for drawing pane separator lines.
* Customisable mode keys.
* Status line colour options, with embedded colours in status-left/right, and
  an option to centre the window list.
* Much improved layouts, including both horizontal and vertical splitting.
* Optional visual bell, activity and content indications.
* Set the utf8 and status-utf8 options when the server is started with -u.
* display-message command to show a message in the status line, by default some
  information about the current window.
* Improved current process detection on NetBSD.
* unlink-window -k is now the same as kill-window.
* attach-session now works from inside tmux.
* A system-wide configuration file, /etc/tmux.conf.
* A number of new commands in copy mode, including searching.
* Panes are now specified using the target (-t) notation.
* -t now accepts fnmatch(3) patterns and looks for prefixes.
* Translate \r into \n when pasting.
* Support for binding commands to keys without the prefix key
* Support for alternate screen (terminfo smcup/rmcup).
* Maintain data that goes off screen after reducing the window size, so it can
  be restored when the size is increased again.
* New if-shell command to test a shell command before running a tmux command.
* tmux now works as the shell.
* Man page reorganisation.
* Many minor additions, much code tidying and several bug fixes.

CHANGES FROM 0.8 TO 0.9, 01 July 2009

* Major changes to build infrastructure: cleanup of makefiles and addition
  of a configure script.
* monitor-content window option to monitor a window for a specific fnmatch(3)
  pattern. The find-window command also now accepts fnmatch(3) patterns.
* previous-layout and select-layout commands, and a main-horizontal layout.
* Recreate the server socket on SIGUSR1.
* clear-history command.
* Use ACS line drawing characters for pane separator lines.
* UTF-8 improvements, and code to detect UTF-8 support by looking at
  environment variables.
* The resize-pane-up and resize-pane-down commands are now merged together
  into a new resize-pane command with -U and -D flags.
* confirm-before command to request a yes/no answer before executing dangerous
  commands.
* Status line bug fixes, support for UTF-8 (status-utf8 option), and a key to
  paste from the paste buffer.
* Support for some additional escape sequences and terminal features, including
  better support for insert mode and tab stops.
* Improved window resizing behaviour, modelled after xterm.
* Some code reduction and a number of miscellaneous bug fixes.

================================================================================

On 01 June 2009, tmux was imported into the OpenBSD base system. From this date
onward changes are logged as part of the normal CVS commit message to either
OpenBSD or SourceForge CVS. This file will be updated to contain a summary of
major changes with each release, and to mention important configuration or
command syntax changes during development.

The list of older changes is below.

================================================================================

21 May 2009

* stat(2) files before trying to load them to avoid problems, for example
  with "source-file /dev/zero".

19 May 2009

* Try to guess if the window is UTF-8 by outputting a three-byte UTF-8 wide
  character and seeing how much the cursor moves. Currently tries to figure out
  if this works by some stupid checks on the terminal, these need to be
  rethought. Also might be better using a width 1 character rather than width 2.
* If LANG contains "UTF-8", assume the terminal supports UTF-8, on the grounds
  that anyone who configures it probably wants UTF-8. Not certain if this is
  a perfect idea but let's see if it causes any problems.
* New window option: monitor-content. Searches for a string in a window and if
  it matches, highlight the status line.

18 May 2009

* main-horizontal layout and main-pane-height option to match vertical.
* New window option main-pane-width to set the width of the large left pane with
  main-vertical (was left-vertical) layout. 
* Lots of layout cleanup. manual layout is now manual-vertical.

16 May 2009

* select-layout command and a few default key bindings (M-0, M-1, M-2, M-9) to
  select layouts.
* Recreate server socket on SIGUSR1, per SF feature request 2792533.

14 May 2009

* Keys in status line (p in vi mode, M-y in emacs) to paste the first line
  of the upper paste buffer. Suggested by Dan Colish.
* clear-history command to clear a pane's history.
* Don't force wrapping with \n when asked, let the cursor code figure it out.
  Should fix terminals which use this to detect line breaks.
* Major cleanup and restructuring of build infrastructure. Still separate files
  for GNU and BSD make, but they are now hugely simplified at the expense of
  adding a configure script which must be run before make. Now build and
  install with:

	$ ./configure && make && sudo make install

04 May 2009

* Use ACS line drawing characters for pane separator lines.

30 April 2009

* Support command sequences without a space before the semicolon, for example
  "neww; neww" now works as well as "neww ; neww". "neww;neww" is still an
  error.
* previous-layout command.
* Display the layout name in window lists.
* Merge resize-pane-up and resize-pane-down into resize-pane with -U and -D
  flags.

29 April 2009

* Get rid of compat/vis.* - only one function was used which is easily
  replaced,and less compat code == good.

27 April 2009

* Avoid using the prompt history when the server is locked, and prevent any
  input entered from being added to the client's prompt history.
* New command, confirm-before (alias confirm), which asks for confirmation
  before executing a command. Bound "&" and "x" by default to confirm-before
  "kill-window" and confirm-before "kill-pane", respectively.

23 April 2009

* Support NEL, yet another way of making newline. Fixes the output from some
  Gentoo packaging thing. Reported by someone on SF then logs that allowed a
  fix sent by tcunha.
* Use the xenl terminfo flag to detect early-wrap terminals like the FreeBSD
  console. Many thanks for a very informative email from Christian Weisgerber.

21 April 2009

* tmux 0.8 released.

17 April 2009

* Remove the right number of characters from the buffer when escape then
  a cursor key (or other key prefixed by \033) is pressed. Reported by
  Stuart Henderson.

03 April 2009

* rotate-window command. -U flag (default) for up, -D flag for down.

02 April 2009

* Change scroll/pane redraws to only redraw the single pane affected rather
  than the entire window.
* If redrawing the region would mean redrawing > half the pane, just schedule
  to redraw the entire window. Also add a flag to skip updating the window any
  further if it is scheduled to be redrawn. This has the effect of batching
  multiple redraws together.

01 April 2009

* Basic horizontal splitting and layout management. Still some redraw and other
  issues - particularly, don't mix with manual pane resizing, be careful when
  viewing from multiple clients and don't expect shell windows to redraw very
  well after the layout is changed; generally cycling the layout a few times
  will fix most problems. Getting this in for testing while I think about how
  to deal with manual mode.

  Split window as normal and cycle the layouts with C-b space. Some of the
  layouts will work better when swap-pane comes along.

31 March 2009

* AIX port, thanks to cmihai for access to a box. Only tested on 6.1 with xlc
  10.1 (make sure CC is set). Needs GNU make and probably ncurses (didn't try
  plain curses). Also won't build with DEBUG, so comment the FDEBUG=1 line in
  GNUmakefile.
* Draw a vertical line on the right when the window size is less than the
  terminal size. This is partly to shake out any horizontal limit bugs on the
  way to horizontal splitting/pane tiling. Currently a bit slow since it has to
  do a lot of redrawing but hopefully that will improve as I get some better
  ideas for how to do it.
* Fix remaining problems with copy and paste and UTF-8.

28 March 2009

* Better UTF-8 support, including combined characters. Unicode data is now
  stored as UTF-8 in a separate array, the code does a lookup into this every
  time it gets to a UTF-8 cell. Zero width characters are just appended onto
  the UTF-8 data for the previous cell. This also means that almost no bytes
  extra are wasted non-Unicode data (yay).

  Still some oddities, such as copy mode skips over wide characters in a
  strange way, and the code could do with some tidying.
* Key repeating is now a property of the key binding not of the command.
  Repeat is turned on when the key is bound with the -r flag to bind-key.
  next/previous-window no longer repeat by default as it turned out to annoy
  me.

27 March 2009

* Clear using ED when redrawing the screen. I foolishly assumed using spaces
  would be equivalent and terminals would pick up on this, but apparently not.
  This fixes copy and paste in xterm/rxvt.
* Sockets in /tmp are now created in a subdirectory named, tmux-UID, eg
  tmux-1000. The default socket is thus /tmp/tmux-UID/default. To start a
  separate server, the new -L command line option should be used: this creates
  a socket in the same directory with a different name ("-L main" will create
  socket called "main"). -S should only be used to place the socket outside
  /tmp. This makes sockets a little more secure and a bit more convenient to
  use multiple servers.

21 March 2009

* New session flag "set-remain-on-exit" to set remain-on-exit flag for new
  windows created in that session (like "remain-by-default" used to do). Not
  perfectly happy about this, but until I can think of a good way to introduce
  it generically (maybe a set of options in the session) this will do. Fixes
  SF request 2527847.

07 March 2009

* Support for 88 colour terminals.
* break-pane command to create a new window using an existing pane.

02 March 2009

* Make escape key timer work properly so escape+key can be used without
  lightning fast key presses.

13 February 2009

* Redo mode keys slightly more cleanly and apply them to command prompt
  editing. vi or emacs mode is controlled by the session option status-keys.

12 February 2009

* Looking up argv[0] is expensive, so just use p_comm for the window name which
  is good enough. Also increase name update time to 500 ms.

11 February 2009

* Only use ri when actually at the top of the screen; just move the cursor up
  otherwise.
* FreeBSD's console wraps lines at $COLUMNS - 1 rather than $COLUMNS (the
  cursor can never be beyond $COLUMNS - 1) and does not appear to support
  changing this behaviour, or any of the obvious possibilities (turning off
  right margin wrapping, insert mode). This is irritating, most notably because
  it impossible to write to the very bottom-right of the screen without
  scrolling. To work around this, if built on FreeBSD and run with a "cons"
  $TERM, the bottom-right cell on the screen is omitted.
* Emulate scroll regions (slowly) to support the few terminals which don't have
  it (some of which don't really have any excuse).

10 February 2009

* No longer redraw the status line every status-interval unless it has actually
  changed.

08 February 2009

* Don't treat empty arguments ("") differently when parsing configuration
  file/command prompt rather than command line.
* tmux 0.7 released.

03 February 2009

* New command, copy-buffer (alias copyb), to copy a session paste buffer to
  another session.

01 February 2009

* The character pair #(command) may now contain (escaped) right parenthesis.

30 January 2009

* . now bound to "command-prompt 'move-window %%'" by default, from joshe.

29 January 2009

* Window options to set status line fg, bg and attributes for a single
  window. Options are: window-status-fg, window-status-bg,
  window-status-attr. Set to "default" to use the session status colours.

  This allows quite neat things like:

	$ cat ~/bin/xssh
	#!/bin/sh

	if [ ! -z "$TMUX" ]; then
	case "$1" in
    	natalya)
	        tmux setw window-status-fg red >/dev/null
		;;
	natasha)
        	tmux setw window-status-fg yellow >/dev/null
		;;
	esac
	fi
	ssh "$@"
	[ ! -z "$TMUX" ] && tmux setw -u window-status-fg >/dev/null
	$ alias ssh="~/bin/xssh"

* Support #(command) in status-left, and status-right, which is displayed as
  the first line of command's output (e.g. set -g status-right
  "#(whoami)@#(hostname -s)"). Commands with )s aren't supported.

28 January 2009

* Support mouse in copy mode to move cursor. Can't do anything else at the
  moment until other mouse modes are handled.
* Better support for at least the most common variant of mouse input: parse it
  and adjust for different panes. Also support mouse in window/session choice
  mode.

27 January 2009

* Bring back the fancy window titles with session/window names: it is easy to
  work around problems with elinks (see FAQ).
* -u flag to scroll-mode and copy-mode to start scrolled one page
  up. scroll-mode -u is bound to prefix,page-up (ppage) by default.
* Allow status, mode and message attributes to be changed by three new options:
  status-attr, mode-attr, message-attr. A comma-separataed list is accepted
  containing: bright, dim, underscore, blink, reverse, hidden, italics, for
  example:

	set -g status-attr bright,blink

  From Josh Elsasser, thanks!

26 January 2009

* Be more clever about picking the right process to create the window name.
* Don't balls up the terminal on UTF-8 combined characters. Don't support them
  properly either - they are just discarded for the moment.

25 January 2009

* load-buffer command

23 January 2009

* Use reverse colours rather than swapping fg and bg for message, mode and
  status line. This makes these usable on black and white terminals.
* Better error messages when creating a session or window fails.
* Oops. Return non-zero on error. Reported by Will Maier.

21 January 2009

* Handle SIGTERM (and kill-server which uses it), a bit more neatly - tidy
  up properly and print a nicer message. Same effect though :-).
* new-window now supports -k to kill target window if it exists.
* Bring back split-window -p and -l options to specify the height a percentage
  or as a number of lines.
* Make window and session choice modes allow you to choose items in vi keys
  mode (doh!). As a side-effect, this makes enter copy selection (as well
  as C-w/M-w) when using emacs keys in copy mode. Reported by merdely.

20 January 2009

* Darwin support for automatic-rename from joshe; Darwin doesn't seem to have
  a sane method of getting argv[0] and searching for the precise insane way
  is too frustrating, so this just uses the executable name.
* Try to change the window title to match the command running it in. This is
  done by reading argv[0] from the process group leader of the group that owns
  the tty (tcgetpgrp()). This can't be done portably so some OS-dependent code
  is introduced (ugh); OpenBSD, FreeBSD and Linux are supported at the moment.
[--snip--]
