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209
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1 ;;; subr.el --- basic lisp subroutines for XEmacs
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2
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3 ;; Copyright (C) 1985, 1986, 1992, 1994-5, 1997 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Tinker Systems and INS Engineering Corp.
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5 ;; Copyright (C) 1995 Sun Microsystems.
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6
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7 ;; Maintainer: XEmacs Development Team
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8 ;; Keywords: extensions, dumped
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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24 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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25 ;; 02111-1307, USA.
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26
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27 ;;; Synched up with: FSF 19.34.
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28
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29 ;;; Commentary:
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30
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31 ;; This file is dumped with XEmacs.
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32
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33 ;; There's not a whole lot in common now with the FSF version,
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34 ;; be wary when applying differences. I've left in a number of lines
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35 ;; of commentary just to give diff(1) something to synch itself with to
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36 ;; provide useful context diffs. -sb
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37
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38 ;;; Code:
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39
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40
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41 ;;;; Lisp language features.
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42
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43 (defmacro lambda (&rest cdr)
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44 "Return a lambda expression.
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45 A call of the form (lambda ARGS DOCSTRING INTERACTIVE BODY) is
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46 self-quoting; the result of evaluating the lambda expression is the
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47 expression itself. The lambda expression may then be treated as a
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48 function, i.e., stored as the function value of a symbol, passed to
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49 funcall or mapcar, etc.
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50
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51 ARGS should take the same form as an argument list for a `defun'.
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52 DOCSTRING is an optional documentation string.
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53 If present, it should describe how to call the function.
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54 But documentation strings are usually not useful in nameless functions.
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55 INTERACTIVE should be a call to the function `interactive', which see.
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56 It may also be omitted.
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57 BODY should be a list of lisp expressions."
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58 `(function (lambda ,@cdr)))
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59
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60 (defmacro defun-when-void (&rest args)
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61 "Define a function, just like `defun', unless it's already defined.
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62 Used for compatibility among different emacs variants."
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63 `(if (fboundp ',(car args))
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64 nil
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65 (defun ,@args)))
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66
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67 (defmacro define-function-when-void (&rest args)
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68 "Define a function, just like `define-function', unless it's already defined.
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69 Used for compatibility among different emacs variants."
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70 `(if (fboundp ,(car args))
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71 nil
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72 (define-function ,@args)))
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73
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74
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75 ;;;; Keymap support.
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76 ;; XEmacs: removed to keymap.el
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77
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272
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78 ;;;; The global keymap tree.
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209
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79
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80 ;;; global-map, esc-map, and ctl-x-map have their values set up in
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81 ;;; keymap.c; we just give them docstrings here.
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82
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83 ;;;; Event manipulation functions.
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84
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85 ;; XEmacs: This stuff is done in C Code.
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86
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87 ;;;; Obsolescent names for functions.
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88 ;; XEmacs: not used.
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89
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90 ;; XEmacs:
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91 (define-function 'not 'null)
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92 (define-function-when-void 'numberp 'integerp) ; different when floats
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93
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94 (defun local-variable-if-set-p (sym buffer)
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95 "Return t if SYM would be local to BUFFER after it is set.
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96 A nil value for BUFFER is *not* the same as (current-buffer), but
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97 can be used to determine whether `make-variable-buffer-local' has been
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98 called on SYM."
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99 (local-variable-p sym buffer t))
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100
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101
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102 ;;;; Hook manipulation functions.
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103
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104 ;; (defconst run-hooks 'run-hooks ...)
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105
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106 (defun make-local-hook (hook)
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107 "Make the hook HOOK local to the current buffer.
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108 When a hook is local, its local and global values
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109 work in concert: running the hook actually runs all the hook
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110 functions listed in *either* the local value *or* the global value
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111 of the hook variable.
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112
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113 This function works by making `t' a member of the buffer-local value,
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114 which acts as a flag to run the hook functions in the default value as
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115 well. This works for all normal hooks, but does not work for most
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116 non-normal hooks yet. We will be changing the callers of non-normal
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117 hooks so that they can handle localness; this has to be done one by
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118 one.
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119
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120 This function does nothing if HOOK is already local in the current
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121 buffer.
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122
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123 Do not use `make-local-variable' to make a hook variable buffer-local."
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124 (if (local-variable-p hook (current-buffer)) ; XEmacs
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125 nil
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126 (or (boundp hook) (set hook nil))
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127 (make-local-variable hook)
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128 (set hook (list t))))
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129
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130 (defun add-hook (hook function &optional append local)
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131 "Add to the value of HOOK the function FUNCTION.
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132 FUNCTION is not added if already present.
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133 FUNCTION is added (if necessary) at the beginning of the hook list
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134 unless the optional argument APPEND is non-nil, in which case
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135 FUNCTION is added at the end.
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136
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137 The optional fourth argument, LOCAL, if non-nil, says to modify
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138 the hook's buffer-local value rather than its default value.
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139 This makes no difference if the hook is not buffer-local.
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140 To make a hook variable buffer-local, always use
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141 `make-local-hook', not `make-local-variable'.
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142
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143 HOOK should be a symbol, and FUNCTION may be any valid function. If
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144 HOOK is void, it is first set to nil. If HOOK's value is a single
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145 function, it is changed to a list of functions."
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146 (or (boundp hook) (set hook nil))
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147 (or (default-boundp hook) (set-default hook nil))
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148 ;; If the hook value is a single function, turn it into a list.
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149 (let ((old (symbol-value hook)))
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150 (if (or (not (listp old)) (eq (car old) 'lambda))
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151 (set hook (list old))))
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152 (if (or local
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153 ;; Detect the case where make-local-variable was used on a hook
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154 ;; and do what we used to do.
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155 (and (local-variable-if-set-p hook (current-buffer)) ; XEmacs
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156 (not (memq t (symbol-value hook)))))
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157 ;; Alter the local value only.
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158 (or (if (consp function)
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159 (member function (symbol-value hook))
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160 (memq function (symbol-value hook)))
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272
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161 (set hook
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209
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162 (if append
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163 (append (symbol-value hook) (list function))
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164 (cons function (symbol-value hook)))))
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165 ;; Alter the global value (which is also the only value,
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166 ;; if the hook doesn't have a local value).
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167 (or (if (consp function)
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168 (member function (default-value hook))
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169 (memq function (default-value hook)))
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272
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170 (set-default hook
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209
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171 (if append
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172 (append (default-value hook) (list function))
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173 (cons function (default-value hook)))))))
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174
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175 (defun remove-hook (hook function &optional local)
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176 "Remove from the value of HOOK the function FUNCTION.
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177 HOOK should be a symbol, and FUNCTION may be any valid function. If
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178 FUNCTION isn't the value of HOOK, or, if FUNCTION doesn't appear in the
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179 list of hooks to run in HOOK, then nothing is done. See `add-hook'.
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180
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181 The optional third argument, LOCAL, if non-nil, says to modify
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182 the hook's buffer-local value rather than its default value.
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183 This makes no difference if the hook is not buffer-local.
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184 To make a hook variable buffer-local, always use
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185 `make-local-hook', not `make-local-variable'."
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186 (if (or (not (boundp hook)) ;unbound symbol, or
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187 (not (default-boundp 'hook))
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188 (null (symbol-value hook)) ;value is nil, or
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189 (null function)) ;function is nil, then
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190 nil ;Do nothing.
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191 (if (or local
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192 ;; Detect the case where make-local-variable was used on a hook
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193 ;; and do what we used to do.
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194 (and (local-variable-p hook (current-buffer))
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195 (not (memq t (symbol-value hook)))))
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196 (let ((hook-value (symbol-value hook)))
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298
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197 (if (and (consp hook-value) (not (functionp hook-value)))
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209
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198 (if (member function hook-value)
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199 (setq hook-value (delete function (copy-sequence hook-value))))
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200 (if (equal hook-value function)
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201 (setq hook-value nil)))
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202 (set hook hook-value))
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203 (let ((hook-value (default-value hook)))
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298
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204 (if (and (consp hook-value) (not (functionp hook-value)))
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209
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205 (if (member function hook-value)
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206 (setq hook-value (delete function (copy-sequence hook-value))))
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207 (if (equal hook-value function)
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208 (setq hook-value nil)))
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209 (set-default hook hook-value)))))
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210
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211 (defun add-to-list (list-var element)
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212 "Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
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213 The test for presence of ELEMENT is done with `equal'.
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214 If you want to use `add-to-list' on a variable that is not defined
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215 until a certain package is loaded, you should put the call to `add-to-list'
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216 into a hook function that will be run only after loading the package.
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217 `eval-after-load' provides one way to do this. In some cases
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218 other hooks, such as major mode hooks, can do the job."
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219 (or (member element (symbol-value list-var))
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220 (set list-var (cons element (symbol-value list-var)))))
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221
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222 ;; XEmacs additions
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223 ;; called by Fkill_buffer()
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224 (defvar kill-buffer-hook nil
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225 "Function or functions to be called when a buffer is killed.
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226 The value of this variable may be buffer-local.
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227 The buffer about to be killed is current when this hook is run.")
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228
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229 ;; in C in FSFmacs
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230 (defvar kill-emacs-hook nil
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231 "Function or functions to be called when `kill-emacs' is called,
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232 just before emacs is actually killed.")
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233
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234 ;; not obsolete.
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235 ;; #### These are a bad idea, because the CL RPLACA and RPLACD
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236 ;; return the cons cell, not the new CAR/CDR. -hniksic
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237 ;; The proper definition would be:
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238 ;; (defun rplaca (conscell newcar)
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239 ;; (setcar conscell newcar)
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240 ;; conscell)
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241 ;; ...and analogously for RPLACD.
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242 (define-function 'rplaca 'setcar)
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243 (define-function 'rplacd 'setcdr)
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244
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245 ;;;; String functions.
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246
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247 ;; XEmacs
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248 (defun replace-in-string (str regexp newtext &optional literal)
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272
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249 "Replace all matches in STR for REGEXP with NEWTEXT string,
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209
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250 and returns the new string.
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251 Optional LITERAL non-nil means do a literal replacement.
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252 Otherwise treat \\ in NEWTEXT string as special:
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253 \\& means substitute original matched text,
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254 \\N means substitute match for \(...\) number N,
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255 \\\\ means insert one \\."
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256 (check-argument-type 'stringp str)
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257 (check-argument-type 'stringp newtext)
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258 (let ((rtn-str "")
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259 (start 0)
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260 (special)
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261 match prev-start)
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262 (while (setq match (string-match regexp str start))
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263 (setq prev-start start
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264 start (match-end 0)
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265 rtn-str
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266 (concat
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267 rtn-str
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268 (substring str prev-start match)
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269 (cond (literal newtext)
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270 (t (mapconcat
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271 (lambda (c)
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272 (if special
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273 (progn
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274 (setq special nil)
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275 (cond ((eq c ?\\) "\\")
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276 ((eq c ?&)
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277 (substring str
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278 (match-beginning 0)
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279 (match-end 0)))
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280 ((and (>= c ?0) (<= c ?9))
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281 (if (> c (+ ?0 (length
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282 (match-data))))
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283 ;; Invalid match num
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284 (error "Invalid match num: %c" c)
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285 (setq c (- c ?0))
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286 (substring str
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287 (match-beginning c)
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288 (match-end c))))
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289 (t (char-to-string c))))
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290 (if (eq c ?\\) (progn (setq special t) nil)
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291 (char-to-string c))))
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292 newtext ""))))))
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293 (concat rtn-str (substring str start))))
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294
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295 (defun split-string (string &optional pattern)
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296 "Return a list of substrings of STRING which are separated by PATTERN.
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297 If PATTERN is omitted, it defaults to \"[ \\f\\t\\n\\r\\v]+\"."
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298 (or pattern
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299 (setq pattern "[ \f\t\n\r\v]+"))
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300 ;; The FSF version of this function takes care not to cons in case
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301 ;; of infloop. Maybe we should synch?
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302 (let (parts (start 0))
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303 (while (string-match pattern string start)
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304 (setq parts (cons (substring string start (match-beginning 0)) parts)
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305 start (match-end 0)))
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306 (nreverse (cons (substring string start) parts))))
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307
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284
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308 ;; #### #### #### AAaargh! Must be in C, because it is used insanely
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309 ;; early in the bootstrap process.
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310 ;(defun split-path (path)
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311 ; "Explode a search path into a list of strings.
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312 ;The path components are separated with the characters specified
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313 ;with `path-separator'."
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314 ; (while (or (not stringp path-separator)
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315 ; (/= (length path-separator) 1))
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316 ; (setq path-separator (signal 'error (list "\
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317 ;`path-separator' should be set to a single-character string"
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318 ; path-separator))))
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319 ; (split-string-by-char path (aref separator 0)))
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320
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209
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321 (defmacro with-output-to-string (&rest forms)
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322 "Collect output to `standard-output' while evaluating FORMS and return
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323 it as a string."
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324 ;; by "William G. Dubuque" <wgd@zurich.ai.mit.edu> w/ mods from Stig
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325 `(with-current-buffer (get-buffer-create " *string-output*")
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326 (setq buffer-read-only nil)
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327 (buffer-disable-undo (current-buffer))
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328 (erase-buffer)
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329 (let ((standard-output (current-buffer)))
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330 ,@forms)
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331 (prog1
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332 (buffer-string)
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333 (erase-buffer))))
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334
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335 (defmacro with-current-buffer (buffer &rest body)
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336 "Execute the forms in BODY with BUFFER as the current buffer.
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337 The value returned is the value of the last form in BODY.
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338 See also `with-temp-buffer'."
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339 `(save-current-buffer
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340 (set-buffer ,buffer)
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341 ,@body))
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342
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343 (defmacro with-temp-file (file &rest forms)
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344 "Create a new buffer, evaluate FORMS there, and write the buffer to FILE.
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345 The value of the last form in FORMS is returned, like `progn'.
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346 See also `with-temp-buffer'."
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347 (let ((temp-file (make-symbol "temp-file"))
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348 (temp-buffer (make-symbol "temp-buffer")))
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349 `(let ((,temp-file ,file)
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350 (,temp-buffer
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351 (get-buffer-create (generate-new-buffer-name " *temp file*"))))
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352 (unwind-protect
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353 (prog1
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354 (with-current-buffer ,temp-buffer
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355 ,@forms)
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356 (with-current-buffer ,temp-buffer
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357 (widen)
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358 (write-region (point-min) (point-max) ,temp-file nil 0)))
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359 (and (buffer-name ,temp-buffer)
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360 (kill-buffer ,temp-buffer))))))
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361
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362 (defmacro with-temp-buffer (&rest forms)
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363 "Create a temporary buffer, and evaluate FORMS there like `progn'.
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364 See also `with-temp-file' and `with-output-to-string'."
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365 (let ((temp-buffer (make-symbol "temp-buffer")))
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366 `(let ((,temp-buffer
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367 (get-buffer-create (generate-new-buffer-name " *temp*"))))
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368 (unwind-protect
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369 (with-current-buffer ,temp-buffer
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370 ,@forms)
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371 (and (buffer-name ,temp-buffer)
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372 (kill-buffer ,temp-buffer))))))
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373
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374 ;; Moved from mule-coding.el.
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375 (defmacro with-string-as-buffer-contents (str &rest body)
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376 "With the contents of the current buffer being STR, run BODY.
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377 Returns the new contents of the buffer, as modified by BODY.
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378 The original current buffer is restored afterwards."
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379 `(let ((tempbuf (get-buffer-create " *string-as-buffer-contents*")))
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380 (with-current-buffer tempbuf
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381 (unwind-protect
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382 (progn
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383 (buffer-disable-undo (current-buffer))
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384 (erase-buffer)
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385 (insert ,str)
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386 ,@body
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387 (buffer-string))
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388 (erase-buffer tempbuf)))))
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389
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390 (defun insert-face (string face)
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272
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391 "Insert STRING and highlight with FACE. Return the extent created."
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209
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392 (let ((p (point)) ext)
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393 (insert string)
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394 (setq ext (make-extent p (point)))
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395 (set-extent-face ext face)
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396 ext))
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397
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398 ;; not obsolete.
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399 (define-function 'string= 'string-equal)
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400 (define-function 'string< 'string-lessp)
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401 (define-function 'int-to-string 'number-to-string)
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402 (define-function 'string-to-int 'string-to-number)
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403
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404 ;; These two names are a bit awkward, as they conflict with the normal
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405 ;; foo-to-bar naming scheme, but CLtL2 has them, so they stay.
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406 (define-function 'char-int 'char-to-int)
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407 (define-function 'int-char 'int-to-char)
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408
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409
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410 ;; alist/plist functions
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411 (defun plist-to-alist (plist)
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412 "Convert property list PLIST into the equivalent association-list form.
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413 The alist is returned. This converts from
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414
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415 \(a 1 b 2 c 3)
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416
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417 into
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418
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419 \((a . 1) (b . 2) (c . 3))
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420
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421 The original plist is not modified. See also `destructive-plist-to-alist'."
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422 (let (alist)
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423 (while plist
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424 (setq alist (cons (cons (car plist) (cadr plist)) alist))
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425 (setq plist (cddr plist)))
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426 (nreverse alist)))
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427
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428 (defun destructive-plist-to-alist (plist)
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429 "Convert property list PLIST into the equivalent association-list form.
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430 The alist is returned. This converts from
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431
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432 \(a 1 b 2 c 3)
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433
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434 into
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435
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436 \((a . 1) (b . 2) (c . 3))
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437
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438 The original plist is destroyed in the process of constructing the alist.
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439 See also `plist-to-alist'."
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440 (let ((head plist)
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441 next)
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442 (while plist
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443 ;; remember the next plist pair.
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444 (setq next (cddr plist))
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445 ;; make the cons holding the property value into the alist element.
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446 (setcdr (cdr plist) (cadr plist))
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447 (setcar (cdr plist) (car plist))
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448 ;; reattach into alist form.
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449 (setcar plist (cdr plist))
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450 (setcdr plist next)
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451 (setq plist next))
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452 head))
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453
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454 (defun alist-to-plist (alist)
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455 "Convert association list ALIST into the equivalent property-list form.
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456 The plist is returned. This converts from
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457
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458 \((a . 1) (b . 2) (c . 3))
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459
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460 into
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461
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462 \(a 1 b 2 c 3)
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463
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464 The original alist is not modified. See also `destructive-alist-to-plist'."
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465 (let (plist)
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466 (while alist
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467 (let ((el (car alist)))
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468 (setq plist (cons (cdr el) (cons (car el) plist))))
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469 (setq alist (cdr alist)))
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470 (nreverse plist)))
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471
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472 ;; getf, remf in cl*.el.
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473
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474 (defmacro putf (plist prop val)
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475 "Add property PROP to plist PLIST with value VAL.
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476 Analogous to (setq PLIST (plist-put PLIST PROP VAL))."
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477 `(setq ,plist (plist-put ,plist ,prop ,val)))
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478
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479 (defmacro laxputf (lax-plist prop val)
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480 "Add property PROP to lax plist LAX-PLIST with value VAL.
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481 Analogous to (setq LAX-PLIST (lax-plist-put LAX-PLIST PROP VAL))."
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482 `(setq ,lax-plist (lax-plist-put ,lax-plist ,prop ,val)))
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483
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484 (defmacro laxremf (lax-plist prop)
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485 "Remove property PROP from lax plist LAX-PLIST.
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486 Analogous to (setq LAX-PLIST (lax-plist-remprop LAX-PLIST PROP))."
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487 `(setq ,lax-plist (lax-plist-remprop ,lax-plist ,prop)))
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488
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489 ;;; Error functions
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490
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491 (defun error (&rest args)
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492 "Signal an error, making error message by passing all args to `format'.
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493 This error is not continuable: you cannot continue execution after the
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494 error using the debugger `r' command. See also `cerror'."
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495 (while t
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496 (apply 'cerror args)))
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497
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498 (defun cerror (&rest args)
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499 "Like `error' but signals a continuable error."
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500 (signal 'error (list (apply 'format args))))
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501
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502 (defmacro check-argument-type (predicate argument)
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503 "Check that ARGUMENT satisfies PREDICATE.
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504 If not, signal a continuable `wrong-type-argument' error until the
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505 returned value satisfies PREDICATE, and assign the returned value
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506 to ARGUMENT."
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507 `(if (not (,(eval predicate) ,argument))
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508 (setq ,argument
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509 (wrong-type-argument ,predicate ,argument))))
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510
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511 (defun signal-error (error-symbol data)
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512 "Signal a non-continuable error. Args are ERROR-SYMBOL, and associated DATA.
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513 An error symbol is a symbol defined using `define-error'.
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514 DATA should be a list. Its elements are printed as part of the error message.
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515 If the signal is handled, DATA is made available to the handler.
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516 See also `signal', and the functions to handle errors: `condition-case'
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517 and `call-with-condition-handler'."
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518 (while t
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519 (signal error-symbol data)))
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520
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521 (defun define-error (error-sym doc-string &optional inherits-from)
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522 "Define a new error, denoted by ERROR-SYM.
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523 DOC-STRING is an informative message explaining the error, and will be
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524 printed out when an unhandled error occurs.
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525 ERROR-SYM is a sub-error of INHERITS-FROM (which defaults to `error').
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526
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527 \[`define-error' internally works by putting on ERROR-SYM an `error-message'
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528 property whose value is DOC-STRING, and an `error-conditions' property
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529 that is a list of ERROR-SYM followed by each of its super-errors, up
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530 to and including `error'. You will sometimes see code that sets this up
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531 directly rather than calling `define-error', but you should *not* do this
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532 yourself.]"
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533 (check-argument-type 'symbolp error-sym)
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534 (check-argument-type 'stringp doc-string)
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535 (put error-sym 'error-message doc-string)
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536 (or inherits-from (setq inherits-from 'error))
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537 (let ((conds (get inherits-from 'error-conditions)))
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538 (or conds (signal-error 'error (list "Not an error symbol" error-sym)))
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539 (put error-sym 'error-conditions (cons error-sym conds))))
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540
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541 ;;;; Miscellanea.
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542
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543 (defun buffer-substring-no-properties (beg end)
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544 "Return the text from BEG to END, without text properties, as a string."
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545 (let ((string (buffer-substring beg end)))
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546 (set-text-properties 0 (length string) nil string)
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547 string))
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548
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284
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549 (defun get-buffer-window-list (&optional buffer minibuf frame)
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209
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550 "Return windows currently displaying BUFFER, or nil if none.
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284
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551 BUFFER defaults to the current buffer.
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209
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552 See `walk-windows' for the meaning of MINIBUF and FRAME."
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284
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553 (cond ((null buffer)
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554 (setq buffer (current-buffer)))
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555 ((not (bufferp buffer))
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556 (setq buffer (get-buffer buffer))))
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557 (let (windows)
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558 (walk-windows (lambda (window)
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559 (if (eq (window-buffer window) buffer)
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560 (push window windows)))
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209
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561 minibuf frame)
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562 windows))
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563
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564 (defun ignore (&rest ignore)
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565 "Do nothing and return nil.
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566 This function accepts any number of arguments, but ignores them."
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567 (interactive)
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568 nil)
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569
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570 (define-function 'mapc-internal 'mapc)
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571 (make-obsolete 'mapc-internal 'mapc)
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572
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573 (define-function 'eval-in-buffer 'with-current-buffer)
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574 (make-obsolete 'eval-in-buffer 'with-current-buffer)
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575
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576 ;;; The real defn is in abbrev.el but some early callers
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577 ;;; (eg lisp-mode-abbrev-table) want this before abbrev.el is loaded...
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578
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579 (if (not (fboundp 'define-abbrev-table))
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580 (progn
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581 (setq abbrev-table-name-list '())
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582 (fset 'define-abbrev-table (function (lambda (name defs)
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583 ;; These are fixed-up when abbrev.el loads.
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584 (setq abbrev-table-name-list
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585 (cons (cons name defs)
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586 abbrev-table-name-list)))))))
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587
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588 (defun functionp (object)
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589 "Non-nil if OBJECT can be called as a function."
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590 (or (and (symbolp object) (fboundp object))
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591 (subrp object)
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592 (compiled-function-p object)
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593 (eq (car-safe object) 'lambda)))
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594
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595
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596
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597 (defun function-interactive (function)
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272
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598 "Return the interactive specification of FUNCTION.
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209
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599 FUNCTION can be any funcallable object.
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600 The specification will be returned as the list of the symbol `interactive'
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601 and the specs.
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602 If FUNCTION is not interactive, nil will be returned."
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603 (setq function (indirect-function function))
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604 (cond ((compiled-function-p function)
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605 (compiled-function-interactive function))
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606 ((subrp function)
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607 (subr-interactive function))
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608 ((eq (car-safe function) 'lambda)
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609 (let ((spec (if (stringp (nth 2 function))
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610 (nth 3 function)
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611 (nth 2 function))))
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612 (and (eq (car-safe spec) 'interactive)
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613 spec)))
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614 (t
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615 (error "Non-funcallable object: %s" function))))
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616
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617 ;; This was not present before. I think Jamie had some objections
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618 ;; to this, so I'm leaving this undefined for now. --ben
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619
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620 ;;; The objection is this: there is more than one way to load the same file.
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621 ;;; "foo", "foo.elc", "foo.el", and "/some/path/foo.elc" are all different
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622 ;;; ways to load the exact same code. `eval-after-load' is too stupid to
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623 ;;; deal with this sort of thing. If this sort of feature is desired, then
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624 ;;; it should work off of a hook on `provide'. Features are unique and
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625 ;;; the arguments to (load) are not. --Stig
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626
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627 ;; We provide this for FSFmacs compatibility, at least until we devise
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628 ;; something better.
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629
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630 ;;;; Specifying things to do after certain files are loaded.
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631
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632 (defun eval-after-load (file form)
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633 "Arrange that, if FILE is ever loaded, FORM will be run at that time.
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634 This makes or adds to an entry on `after-load-alist'.
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635 If FILE is already loaded, evaluate FORM right now.
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636 It does nothing if FORM is already on the list for FILE.
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637 FILE should be the name of a library, with no directory name."
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638 ;; Make sure there is an element for FILE.
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639 (or (assoc file after-load-alist)
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640 (setq after-load-alist (cons (list file) after-load-alist)))
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641 ;; Add FORM to the element if it isn't there.
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642 (let ((elt (assoc file after-load-alist)))
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643 (or (member form (cdr elt))
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644 (progn
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645 (nconc elt (list form))
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646 ;; If the file has been loaded already, run FORM right away.
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647 (and (assoc file load-history)
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648 (eval form)))))
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649 form)
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650 (make-compatible 'eval-after-load "")
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651
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652 (defun eval-next-after-load (file)
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653 "Read the following input sexp, and run it whenever FILE is loaded.
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654 This makes or adds to an entry on `after-load-alist'.
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655 FILE should be the name of a library, with no directory name."
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656 (eval-after-load file (read)))
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657 (make-compatible 'eval-next-after-load "")
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658
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659 ; alternate names (not obsolete)
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660 (if (not (fboundp 'mod)) (define-function 'mod '%))
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661 (define-function 'move-marker 'set-marker)
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662 (define-function 'beep 'ding) ; preserve lingual purity
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663 (define-function 'indent-to-column 'indent-to)
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664 (define-function 'backward-delete-char 'delete-backward-char)
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665 (define-function 'search-forward-regexp (symbol-function 're-search-forward))
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666 (define-function 'search-backward-regexp (symbol-function 're-search-backward))
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667 (define-function 'remove-directory 'delete-directory)
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668 (define-function 'set-match-data 'store-match-data)
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669 (define-function 'send-string-to-terminal 'external-debugging-output)
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670 (define-function 'buffer-string 'buffer-substring)
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671
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672 ;;; subr.el ends here
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