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comparison lisp/hyperbole/hlvar.el @ 0:376386a54a3c r19-14

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Import from CVS: tag r19-14
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date Mon, 13 Aug 2007 08:45:50 +0200
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-1:000000000000 0:376386a54a3c
1 ;;!emacs
2 ;;
3 ;; FILE: hlvar.el
4 ;; SUMMARY: Permits use of Hyperbole variables in local variable lists.
5 ;; USAGE: GNU Emacs Lisp Library
6 ;; KEYWORDS: extensions, hypermedia
7 ;;
8 ;; AUTHOR: Bob Weiner
9 ;; ORG: Brown U.
10 ;;
11 ;; ORIG-DATE: 4-Nov-91 at 00:26:06
12 ;; LAST-MOD: 21-Jun-95 at 00:50:14 by Bob Weiner
13 ;;
14 ;; This file is part of Hyperbole.
15 ;; Available for use and distribution under the same terms as GNU Emacs.
16 ;;
17 ;; Copyright (C) 1985-1995, Free Software Foundation, Inc.
18 ;;
19 ;; This file is not part of GNU Emacs but the code here is a slight
20 ;; variant of that found in "files.el" from GNU Emacs.
21 ;;
22 ;; DESCRIPTION:
23 ;;
24 ;; Hyperbole uses the colon character extensively in its variable names.
25 ;; The standard GNU Emacs syntax for local variable setting does not allow
26 ;; the use of this character, even though it is a valid symbol name
27 ;; character. The code here is slightly modified to support local setting of
28 ;; variables with colons in their names.
29 ;;
30 ;; Where the standard code allows: var:val
31 ; This code requires one use: var: val (where var may include colons)
32 ;;
33 ;; So functionality is gained and none is lost, but a slight incompatibility
34 ;; in protocol is introduced.
35 ;;
36 ;; DESCRIP-END.
37
38 ;;; ************************************************************************
39 ;;; Public functions
40 ;;; ************************************************************************
41
42 (defun hack-local-variables (&optional force)
43 "Parse, and bind or evaluate as appropriate, any local variables
44 for current buffer."
45 (if (fboundp 'hack-local-variables-prop-line)
46 (hack-local-variables-prop-line))
47 ;; Look for "Local variables:" line in last page.
48 (save-excursion
49 (goto-char (point-max))
50 (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move)
51 (let (local-start)
52 (if (let ((case-fold-search t)
53 (ignore nil))
54 (and (search-forward "Local Variables:" nil t)
55 (setq local-start (match-beginning 0))
56 (or (and (not (string-match "^19\\." emacs-version))
57 (not inhibit-local-variables))
58 force
59 (if (string-match "^19\\." emacs-version)
60 (cond ((eq enable-local-variables t) t)
61 ((eq enable-local-variables nil)
62 (setq ignore t))))
63 (if ignore
64 nil
65 (save-window-excursion
66 (switch-to-buffer (current-buffer))
67 (save-excursion
68 (beginning-of-line)
69 (set-window-start (selected-window) (point)))
70 (y-or-n-p
71 (format "Set local variables as specified at end of %s? "
72 (file-name-nondirectory
73 buffer-file-name))))))))
74 (let ((continue t)
75 prefix prefixlen suffix beg
76 (enable-local-eval
77 (if (boundp 'enable-local-eval) enable-local-eval)))
78 ;; The prefix is what comes before "local variables:" in its line.
79 ;; The suffix is what comes after "local variables:" in its line.
80 (skip-chars-forward " \t")
81 (or (eolp)
82 (setq suffix (buffer-substring (point)
83 (progn (end-of-line) (point)))))
84 (goto-char local-start)
85 (or (bolp)
86 (setq prefix
87 (buffer-substring (point)
88 (progn (beginning-of-line) (point)))))
89
90 (if prefix (setq prefixlen (length prefix)
91 prefix (regexp-quote prefix)))
92 (if suffix (setq suffix (concat (regexp-quote suffix) "$")))
93 (while continue
94 ;; Look at next local variable spec.
95 (if selective-display (re-search-forward "[\n\C-m]")
96 (forward-line 1))
97 ;; Skip the prefix, if any.
98 (if prefix
99 (if (looking-at prefix)
100 (forward-char prefixlen)
101 (error "Local variables entry is missing the prefix")))
102 ;; Find the variable name; strip whitespace.
103 (skip-chars-forward " \t")
104 (setq beg (point))
105 ;;
106 ;; Bob Weiner - changed here to allow colons in var names.
107 ;;
108 (skip-chars-forward "^ \t\n")
109 (skip-chars-backward ":")
110 (or (looking-at "[ \t]*:")
111 (error "(hack-local-variables): Missing colon in local variables entry"))
112 ;;
113 ;; Bob Weiner - end changes.
114 ;;
115 (let* ((str (buffer-substring beg (point)))
116 (var (read str))
117 val)
118 ;; Setting variable named "end" means end of list.
119 (if (string-equal (downcase str) "end")
120 (setq continue nil)
121 ;; Otherwise read the variable value.
122 (skip-chars-forward "^:")
123 (forward-char 1)
124 (setq val (read (current-buffer)))
125 (skip-chars-backward "\n")
126 (skip-chars-forward " \t")
127 (or (if suffix (looking-at suffix) (eolp))
128 (error "Local variables entry is terminated incorrectly"))
129 ;; Set the variable. "Variables" mode and eval are funny.
130 (if (fboundp 'hack-one-local-variable)
131 (hack-one-local-variable var val)
132 (cond ((eq var 'mode)
133 (funcall (intern (concat (downcase (symbol-name val))
134 "-mode"))))
135 ((eq var 'eval)
136 (if (string= (user-login-name) "root")
137 (message
138 "Ignoring `eval:' in file's local variables")
139 (eval val)))
140 (t (make-local-variable var)
141 (set var val))))))))))
142 (run-hooks 'hack-local-variables-hook)))
143
144 (provide 'hlvar)