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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, 2003, 2004, 2005, 2006, 2007, 2008,
   4 @c   2009, 2010, 2011, 2012  Free Software Foundation, Inc.
   5 @c See the file elisp.texi for copying conditions.
   6
   7 @c This node must have no pointers.
   8
   9 @node Antinews, GNU Free Documentation License, System Interface, Top
  10 @appendix Emacs 22 Antinews
  11 @c Update the elisp.texi, vol1.texi, vol2.texi Antinews menu entries
  12 @c with the above version number.
  13
  14 For those users who live backwards in time, here is information about
  15 downgrading to Emacs version 22.3.  We hope you will enjoy the greater
  16 simplicity that results from the absence of many Emacs @value{EMACSVER}
  17 features.
  18
  19 @section Old Lisp Features in Emacs 22
  20
  21 @itemize @bullet
  22 @item
  23 The internal character representation used by Emacs is not longer
  24 based on Unicode.  In this representation, called @code{emacs-mule},
  25 each character belongs to one and only one script.  Emacs makes no
  26 attempt to distinguish between ``similar'' characters occurring in
  27 different scripts.
  28
  29 @item
  30 The @code{^} interactive spec code, the function
  31 @code{handle-shift-selection}, and the variable
  32 @code{this-command-keys-shift-translated} have all been removed.
  33 Shift-translated keys are no longer treated specially, making Emacs'
  34 handling of keybindings much more consistent.
  35
  36 @item
  37 Temporarily-active regions are not created by giving the variable
  38 @code{transient-mark-mode} values of the form @code{(only
  39 . @var{oldvar})}.  We instead use a more complicated scheme:
  40 setting @code{transient-mark-mode} to @code{only} enables Transient
  41 Mark mode for the following command only, during which the value of
  42 @code{transient-mark-mode} is set to @code{identity}; if it is still
  43 @code{identity} at the end of the command, Transient Mark mode is
  44 disabled.
  45
  46 @item
  47 Many minibuffer functions, such as @code{read-file-name} and
  48 @code{minibuffer-complete}, have been rewritten in C for greater
  49 speed.  The completion code has been considerably simplified; the
  50 completion style can no longer be changed via
  51 @code{completion-styles-alist}, and @code{completing-read} no longer
  52 recognizes the special values @code{confirm-only} and
  53 @code{confirm-after-completion} for its @var{require-match} argument.
  54
  55 @item
  56 Emacs no longer supports explicitly-numbered groups in regular
  57 expressions.
  58
  59 @item
  60 The @code{permanent-local-hook} function property has no special
  61 meaning.
  62
  63 @item
  64 The @code{functionp} function now returns @code{t} for special forms.
  65
  66 @item
  67 The @code{interactive-form} symbol property has no special meaning.
  68 Once you supply a function with an interactive form, the only way to
  69 change it is to redefine the function.
  70
  71 @item
  72 The @code{ignore-errors} macro has been moved into the @code{cl}
  73 package.
  74
  75 @item
  76 Variables can now be both buffer-local and frame-local; buffer-local
  77 bindings take precedence over frame-local bindings.
  78
  79 @item
  80 Faces can no longer be remapped.
  81
  82 @item
  83 Lisp programs now specify fonts by their names, which are strings
  84 following the XLFD (X logical font descriptor) format.  Fonts are no
  85 longer represented using a special set of ``font'' data types.  The
  86 various functions that act on these data types, such as @code{fontp},
  87 @code{font-spec}, and @code{list-fonts}, have all been deleted.
  88
  89 @item
  90 Emacs does not recognize the @code{FontBackend} X resource and the
  91 @code{font-backend} frame parameter.  On the X Window System, fonts
  92 are always drawn using the X core font driver.
  93
  94 @item
  95 Display terminals are no longer represented using a ``terminal'' data
  96 type; this is not necessary, because we have removed the ability to
  97 display on graphical and text-only terminals simultaneously.  For the
  98 same reason, the @code{window-system} variable is no longer
  99 frame-local, and the @code{window-system} function has been removed.
 100
 101 @item
 102 The functions @code{list-system-processes} and
 103 @code{process-attributes} have been removed.  To get information about
 104 system processes, call an external program, such as @command{ps}.
 105
 106 @item
 107 The function @code{locate-user-emacs-file} and the variable
 108 @code{user-emacs-directory} have been removed.  Instead, use
 109 hard-coded values pointing to @file{~/.emacs.d}.
 110
 111 @item
 112 @code{vertical-motion} can no longer be told to move to a specific
 113 column; it always puts point on the first column of a line.
 114
 115 @item
 116 Windows no longer have parameters.
 117
 118 @item
 119 The @code{display-buffer} function has been rewritten in C.  Its
 120 window-splitting heuristics are a little less sophisticated, and a
 121 little less documented.  Window-splitting is handled internally,
 122 instead of using @code{split-window-preferred-function} (which has
 123 been removed).  Windows are never split horizontally; the variable
 124 @code{split-width-threshold} has been removed.
 125
 126 @item
 127 The @code{mode-name} variable now accepts only string values, and
 128 cannot take the form of a mode-line construct.
 129
 130 @item
 131 The behavior of @code{map-char-table} has changed.  It calls the
 132 mapping function for every single character in the table, instead of
 133 using cons cells to represent contiguous character code ranges.
 134
 135 @item
 136 Several keymaps have been eliminated: @code{input-decode-map},
 137 @code{local-function-key-map}, @code{search-map},
 138 @code{multi-query-replace-map}, and
 139 @code{minibuffer-local-shell-command-map}.
 140
 141 @item
 142 Many functions have been removed, including: @code{buffer-swap-text},
 143 @code{emacs-init-time}, @code{emacs-uptime}, @code{use-region-p},
 144 @code{region-active-p}, @code{start-file-process},
 145 @code{process-lines}, @code{image-refresh},
 146 @code{match-substitute-replacement}, @code{word-search-forward-lax},
 147 and @code{word-search-backward-lax}.
 148
 149 @item
 150 Many variables have been removed, including @code{read-circle},
 151 @code{after-init-time} and @code{before-init-time},
 152 @code{generate-autoload-cookie}, @code{file-local-variables-alist},
 153 @code{replace-search-function} and @code{replace-re-search-function},
 154 @code{inhibit-changing-match-data}, @code{wrap-prefix}, and
 155 @code{line-prefix},
 156 @end itemize
 157
 158 @ignore
 159    arch-tag: 1d0ef137-2bad-430e-ae8e-d820d569b5a6
 160 @end ignore