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   1 @c -*-texinfo-*-
   2 @c This is part of the GNU Emacs Lisp Reference Manual.
   3 @c Copyright (C) 1999, 2002-2011  Free Software Foundation, Inc.
   4 @c See the file elisp.texi for copying conditions.
   5
   6 @c This node must have no pointers.
   7
   8 @node Antinews, GNU Free Documentation License, Packaging, Top
   9 @appendix Emacs 22 Antinews
  10 @c Update the elisp.texi, vol1.texi, vol2.texi Antinews menu entries
  11 @c with the above version number.
  12
  13 For those users who live backwards in time, here is information about
  14 downgrading to Emacs version 22.3.  We hope you will enjoy the greater
  15 simplicity that results from the absence of many Emacs @value{EMACSVER}
  16 features.
  17
  18 @section Old Lisp Features in Emacs 22
  19
  20 @itemize @bullet
  21 @item
  22 The internal character representation used by Emacs is not longer
  23 based on Unicode.  In this representation, called @code{emacs-mule},
  24 each character belongs to one and only one script.  Emacs makes no
  25 attempt to distinguish between ``similar'' characters occurring in
  26 different scripts.
  27
  28 @item
  29 The @code{^} interactive spec code, the function
  30 @code{handle-shift-selection}, and the variable
  31 @code{this-command-keys-shift-translated} have all been removed.
  32 Shift-translated keys are no longer treated specially, making Emacs'
  33 handling of keybindings much more consistent.
  34
  35 @item
  36 Temporarily-active regions are not created by giving the variable
  37 @code{transient-mark-mode} values of the form @code{(only
  38 . @var{oldvar})}.  We instead use a more complicated scheme:
  39 setting @code{transient-mark-mode} to @code{only} enables Transient
  40 Mark mode for the following command only, during which the value of
  41 @code{transient-mark-mode} is set to @code{identity}; if it is still
  42 @code{identity} at the end of the command, Transient Mark mode is
  43 disabled.
  44
  45 @item
  46 Many minibuffer functions, such as @code{read-file-name} and
  47 @code{minibuffer-complete}, have been rewritten in C for greater
  48 speed.  The completion code has been considerably simplified; the
  49 completion style can no longer be changed via
  50 @code{completion-styles-alist}, and @code{completing-read} no longer
  51 recognizes the special values @code{confirm-only} and
  52 @code{confirm-after-completion} for its @var{require-match} argument.
  53
  54 @item
  55 Emacs no longer supports explicitly-numbered groups in regular
  56 expressions.
  57
  58 @item
  59 The @code{permanent-local-hook} function property has no special
  60 meaning.
  61
  62 @item
  63 The @code{functionp} function now returns @code{t} for special forms.
  64
  65 @item
  66 The @code{interactive-form} symbol property has no special meaning.
  67 Once you supply a function with an interactive form, the only way to
  68 change it is to redefine the function.
  69
  70 @item
  71 The @code{ignore-errors} macro has been moved into the @code{cl}
  72 package.
  73
  74 @item
  75 Variables can now be both buffer-local and frame-local; buffer-local
  76 bindings take precedence over frame-local bindings.
  77
  78 @item
  79 Faces can no longer be remapped.
  80
  81 @item
  82 Lisp programs now specify fonts by their names, which are strings
  83 following the XLFD (X logical font descriptor) format.  Fonts are no
  84 longer represented using a special set of ``font'' data types.  The
  85 various functions that act on these data types, such as @code{fontp},
  86 @code{font-spec}, and @code{list-fonts}, have all been deleted.
  87
  88 @item
  89 Emacs does not recognize the @code{FontBackend} X resource and the
  90 @code{font-backend} frame parameter.  On the X Window System, fonts
  91 are always drawn using the X core font driver.
  92
  93 @item
  94 Display terminals are no longer represented using a ``terminal'' data
  95 type; this is not necessary, because we have removed the ability to
  96 display on graphical and text-only terminals simultaneously.  For the
  97 same reason, the @code{window-system} variable is no longer
  98 frame-local, and the @code{window-system} function has been removed.
  99
 100 @item
 101 The functions @code{list-system-processes} and
 102 @code{process-attributes} have been removed.  To get information about
 103 system processes, call an external program, such as @command{ps}.
 104
 105 @item
 106 The function @code{locate-user-emacs-file} and the variable
 107 @code{user-emacs-directory} have been removed.  Instead, use
 108 hard-coded values pointing to @file{~/.emacs.d}.
 109
 110 @item
 111 @code{vertical-motion} can no longer be told to move to a specific
 112 column; it always puts point on the first column of a line.
 113
 114 @item
 115 Windows no longer have parameters.
 116
 117 @item
 118 The @code{display-buffer} function has been rewritten in C.  Its
 119 window-splitting heuristics are a little less sophisticated, and a
 120 little less documented.  Window-splitting is handled internally,
 121 instead of using @code{split-window-preferred-function} (which has
 122 been removed).  Windows are never split horizontally; the variable
 123 @code{split-width-threshold} has been removed.
 124
 125 @item
 126 The @code{mode-name} variable now accepts only string values, and
 127 cannot take the form of a mode-line construct.
 128
 129 @item
 130 The behavior of @code{map-char-table} has changed.  It calls the
 131 mapping function for every single character in the table, instead of
 132 using cons cells to represent contiguous character code ranges.
 133
 134 @item
 135 Several keymaps have been eliminated: @code{input-decode-map},
 136 @code{local-function-key-map}, @code{search-map},
 137 @code{multi-query-replace-map}, and
 138 @code{minibuffer-local-shell-command-map}.
 139
 140 @item
 141 Many functions have been removed, including: @code{buffer-swap-text},
 142 @code{emacs-init-time}, @code{emacs-uptime}, @code{use-region-p},
 143 @code{region-active-p}, @code{start-file-process},
 144 @code{process-lines}, @code{image-refresh},
 145 @code{match-substitute-replacement}, @code{word-search-forward-lax},
 146 and @code{word-search-backward-lax}.
 147
 148 @item
 149 Many variables have been removed, including @code{read-circle},
 150 @code{after-init-time} and @code{before-init-time},
 151 @code{generate-autoload-cookie}, @code{file-local-variables-alist},
 152 @code{replace-search-function} and @code{replace-re-search-function},
 153 @code{inhibit-changing-match-data}, @code{wrap-prefix}, and
 154 @code{line-prefix},
 155 @end itemize