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1 ;;!emacs
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2 ;;
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3 ;; FILE: hlvar.el
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4 ;; SUMMARY: Permits use of Hyperbole variables in local variable lists.
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5 ;; USAGE: GNU Emacs Lisp Library
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6 ;; KEYWORDS: extensions, hypermedia
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7 ;;
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8 ;; AUTHOR: Bob Weiner
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9 ;; ORG: Brown U.
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10 ;;
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11 ;; ORIG-DATE: 4-Nov-91 at 00:26:06
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12 ;; LAST-MOD: 21-Jun-95 at 00:50:14 by Bob Weiner
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13 ;;
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14 ;; This file is part of Hyperbole.
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15 ;; Available for use and distribution under the same terms as GNU Emacs.
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16 ;;
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17 ;; Copyright (C) 1985-1995, Free Software Foundation, Inc.
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18 ;;
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19 ;; This file is not part of GNU Emacs but the code here is a slight
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20 ;; variant of that found in "files.el" from GNU Emacs.
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21 ;;
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22 ;; DESCRIPTION:
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23 ;;
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24 ;; Hyperbole uses the colon character extensively in its variable names.
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25 ;; The standard GNU Emacs syntax for local variable setting does not allow
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26 ;; the use of this character, even though it is a valid symbol name
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27 ;; character. The code here is slightly modified to support local setting of
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28 ;; variables with colons in their names.
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29 ;;
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30 ;; Where the standard code allows: var:val
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31 ; This code requires one use: var: val (where var may include colons)
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32 ;;
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33 ;; So functionality is gained and none is lost, but a slight incompatibility
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34 ;; in protocol is introduced.
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35 ;;
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36 ;; DESCRIP-END.
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37
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38 ;;; ************************************************************************
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39 ;;; Public functions
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40 ;;; ************************************************************************
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41
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42 (defun hack-local-variables (&optional force)
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43 "Parse, and bind or evaluate as appropriate, any local variables
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44 for current buffer."
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45 (if (fboundp 'hack-local-variables-prop-line)
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46 (hack-local-variables-prop-line))
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47 ;; Look for "Local variables:" line in last page.
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48 (save-excursion
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49 (goto-char (point-max))
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50 (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move)
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51 (let (local-start)
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52 (if (let ((case-fold-search t)
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53 (ignore nil))
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54 (and (search-forward "Local Variables:" nil t)
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55 (setq local-start (match-beginning 0))
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56 (or (and (not (string-match "^19\\." emacs-version))
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57 (not inhibit-local-variables))
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58 force
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59 (if (string-match "^19\\." emacs-version)
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60 (cond ((eq enable-local-variables t) t)
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61 ((eq enable-local-variables nil)
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62 (setq ignore t))))
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63 (if ignore
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64 nil
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65 (save-window-excursion
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66 (switch-to-buffer (current-buffer))
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67 (save-excursion
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68 (beginning-of-line)
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69 (set-window-start (selected-window) (point)))
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70 (y-or-n-p
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71 (format "Set local variables as specified at end of %s? "
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72 (file-name-nondirectory
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73 buffer-file-name))))))))
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74 (let ((continue t)
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75 prefix prefixlen suffix beg
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76 (enable-local-eval
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77 (if (boundp 'enable-local-eval) enable-local-eval)))
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78 ;; The prefix is what comes before "local variables:" in its line.
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79 ;; The suffix is what comes after "local variables:" in its line.
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80 (skip-chars-forward " \t")
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81 (or (eolp)
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82 (setq suffix (buffer-substring (point)
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83 (progn (end-of-line) (point)))))
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84 (goto-char local-start)
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85 (or (bolp)
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86 (setq prefix
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87 (buffer-substring (point)
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88 (progn (beginning-of-line) (point)))))
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89
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90 (if prefix (setq prefixlen (length prefix)
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91 prefix (regexp-quote prefix)))
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92 (if suffix (setq suffix (concat (regexp-quote suffix) "$")))
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93 (while continue
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94 ;; Look at next local variable spec.
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95 (if selective-display (re-search-forward "[\n\C-m]")
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96 (forward-line 1))
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97 ;; Skip the prefix, if any.
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98 (if prefix
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99 (if (looking-at prefix)
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100 (forward-char prefixlen)
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101 (error "Local variables entry is missing the prefix")))
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102 ;; Find the variable name; strip whitespace.
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103 (skip-chars-forward " \t")
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104 (setq beg (point))
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105 ;;
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106 ;; Bob Weiner - changed here to allow colons in var names.
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107 ;;
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108 (skip-chars-forward "^ \t\n")
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109 (skip-chars-backward ":")
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110 (or (looking-at "[ \t]*:")
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111 (error "(hack-local-variables): Missing colon in local variables entry"))
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112 ;;
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113 ;; Bob Weiner - end changes.
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114 ;;
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115 (let* ((str (buffer-substring beg (point)))
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116 (var (read str))
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117 val)
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118 ;; Setting variable named "end" means end of list.
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119 (if (string-equal (downcase str) "end")
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120 (setq continue nil)
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121 ;; Otherwise read the variable value.
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122 (skip-chars-forward "^:")
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123 (forward-char 1)
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124 (setq val (read (current-buffer)))
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125 (skip-chars-backward "\n")
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126 (skip-chars-forward " \t")
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127 (or (if suffix (looking-at suffix) (eolp))
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128 (error "Local variables entry is terminated incorrectly"))
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129 ;; Set the variable. "Variables" mode and eval are funny.
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130 (if (fboundp 'hack-one-local-variable)
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131 (hack-one-local-variable var val)
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132 (cond ((eq var 'mode)
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133 (funcall (intern (concat (downcase (symbol-name val))
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134 "-mode"))))
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135 ((eq var 'eval)
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136 (if (string= (user-login-name) "root")
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137 (message
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138 "Ignoring `eval:' in file's local variables")
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139 (eval val)))
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140 (t (make-local-variable var)
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141 (set var val))))))))))
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142 (run-hooks 'hack-local-variables-hook)))
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143
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144 (provide 'hlvar)
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