summaryrefslogtreecommitdiff
path: root/lisp/info-xref.el
blob: d6b14faee0ed8796f5ce4194d5149dcbcb525266 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
;;; info-xref.el --- check external references in an Info document

;; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.

;; Author: Kevin Ryde <user42@zip.com.au>
;; Keywords: docs

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This file implements some simple checking of external cross references in
;; info files, by attempting to visit the nodes specified.
;;
;; "makeinfo" checks references internal to a document, but not external
;; references, which makes it rather easy for mistakes to creep in or node
;; name changes to go unnoticed.  `Info-validate' doesn't check external
;; references either.
;;
;; `M-x info-xref-check' checks one file.  When invoked from an Info-mode or
;; texinfo-mode buffer, the current info file is the default at the prompt.
;;
;; `M-x info-xref-check-all' looks at everything in the normal info path.
;; This might be a lot of files but it's a good way to check the consistency
;; of the whole system.
;;
;; Results are shown in a buffer.  The format is a bit rough, but hopefully
;; there won't be too many problems normally, and correcting them is a
;; manual process anyway, a case of finding the right spot in the original
;; .texi and finding what node it ought to point to.
;;
;; When a target info file doesn't exist there's clearly no way to validate
;; node references within it.  A message is given for missing target files
;; (once per source document), it could be simply that the target hasn't
;; been installed, or it could be a mistake in the reference.
;;
;; Indirect info files are understood, just pass the top-level foo.info to
;; `info-xref-check' and it traverses all sub-files.  Compressed info files
;; are accepted too, as usual for `Info-mode'.
;;
;; `info-xref-check-all' is rather permissive in what it considers an info
;; file.  It has to be since info files don't necessarily have a ".info"
;; suffix (eg. this is usual for the emacs manuals).  One consequence of
;; this is that if for instance there's a source code directory in
;; `Info-directory-list' then a lot of extraneous files might be read, which
;; will be time consuming but should be harmless.
;;
;; `M-x info-xref-check-all-custom' is a related command, it goes through
;; all info document references in customizable variables, checking them
;; like info file cross references.

;;; Code:

(require 'info)

(defconst info-xref-results-buffer "*info-xref results*"
  "Name of the buffer for info-xref results.")

;;;###autoload
(defun info-xref-check (filename)
  "Check external references in FILENAME, an info document."
  (interactive
   (list
    (let* ((default-filename
             (cond ((eq major-mode 'Info-mode)
                    Info-current-file)
                   ((eq major-mode 'texinfo-mode)
                    ;; look for @setfilename like makeinfo.el does
                    (save-excursion
                      (goto-char (point-min))
                      (if (re-search-forward
                           "^@setfilename[ \t]+\\([^ \t\n]+\\)[ \t]*"
                           (line-beginning-position 100) t)
                          (expand-file-name (match-string 1)))))))
           (prompt (if default-filename
                       (format "Info file (%s): " default-filename)
                     "Info file: ")))
      (read-file-name prompt nil default-filename t))))
  (info-xref-check-list (list filename)))

;;;###autoload
(defun info-xref-check-all ()
  "Check external references in all info documents in the usual path.
The usual path is `Info-directory-list' and `Info-additional-directory-list'."
  (interactive)
  (info-xref-check-list (info-xref-all-info-files)))

;; An alternative to trying to get only top-level files here would be to
;; simply return all files, and have info-xref-check-list not follow
;; Indirect:.  The current way seems a bit nicer though, because it gets the
;; proper top-level filename into the error messages, and suppresses
;; duplicate "not available" messages for all subfiles of a single document.

(defun info-xref-all-info-files ()
  "Return a list of all available info files.
Only top-level files are returned, subfiles are excluded.

Since info files don't have to have a .info suffix, all files in the
relevant directories are considered, which might mean a lot of extraneous
things are returned if for instance a source code directory is in the path."

  (info-initialize) ;; establish Info-directory-list
  (apply 'nconc
         (mapcar
          (lambda (dir)
            (let ((result nil))
              (dolist (name (directory-files dir t))
                (unless (or (file-directory-p name) (info-xref-subfile-p name))
		  (push name result)))
              (nreverse result)))
          (append Info-directory-list Info-additional-directory-list))))

(defun info-xref-subfile-p (filename)
  "Return t if FILENAME is an info subfile.
If removing the last \"-<NUM>\" from the filename gives a file that exists,
then consider FILENAME a subfile.  This is an imperfect test, we probably
should open up the purported top file and see what subfiles it says."
  (and (string-match "\\`\\(\\([^-]*-\\)*[^-]*\\)-[0-9]+\\(.*\\)\\'" filename)
       (file-exists-p (concat (match-string 1 filename)
                              (match-string 3 filename)))))


;; Some dynamic variables are used to share information with sub-functions
;; below.
;;
;; info-xref-filename-header - a heading message for the current top-level
;;     filename, or "" when it's been printed.
;;
(defvar info-xref-xfile-alist)
;;
;; info-xref-good - count of good cross references.
;;
(defvar info-xref-good)
;;
;; info-xref-bad - count of bad cross references.
;;
(defvar info-xref-bad)
;;
;; info-xref-xfile-alist - indexed by "(foo)" with value nil or t according
;;     to whether "(foo)" exists or not.  This is used to suppress duplicate
;;     messages about foo not being available.  (Duplicates within one
;;     top-level file that is.)
;;
(defvar info-xref-filename-heading)

(defun info-xref-check-list (filename-list)
  "Check external references in info documents in FILENAME-LIST."
  (pop-to-buffer info-xref-results-buffer t)
  (erase-buffer)
  (let ((info-xref-good 0)
        (info-xref-bad  0))
    (dolist (info-xref-filename filename-list)
      (let ((info-xref-filename-heading
             (format "In file %s:\n" info-xref-filename))
            (info-xref-xfile-alist nil))
        (with-temp-message (format "Looking at %s" info-xref-filename)
          (with-temp-buffer
            (info-insert-file-contents info-xref-filename)
            (goto-char (point-min))
            (if (re-search-forward "\^_\nIndirect:\n" nil t)
                (let ((dir (file-name-directory info-xref-filename)))
                  (while (looking-at "\\(.*\\): [0-9]+\n")
                    (let ((subfile (match-string 1)))
                      (with-temp-buffer
                        (info-insert-file-contents
                         (expand-file-name subfile dir))
                        (info-xref-check-buffer)))
                    (forward-line)))
              (info-xref-check-buffer))))))
    (insert (format "done, %d good, %d bad\n" info-xref-good info-xref-bad))))

(defun info-xref-check-buffer ()
  "Check external references in the info file in the current buffer.
This should be the raw file contents, not `Info-mode'."
  (goto-char (point-min))
  (while (re-search-forward
          "\\*[Nn]ote[ \n\t]+[^:]*:[ \n\t]+\\(\\(([^)]*)\\)[^.,]+\\)[.,]"
          nil t)
    (let* ((file (match-string 2))
           (node ;; Canonicalize spaces: we could use "[\t\n ]+" but
	    ;; we try to avoid uselessly replacing " " with " ".
	    (replace-regexp-in-string "[\t\n][\t\n ]*\\| [\t\n ]+" " "
				      (match-string 1) t t)))
      (if (string-equal "()" file)
          (info-xref-output "Empty filename part: %s\n" node)
        ;; see if the file exists, if we haven't tried it before
        (unless (assoc file info-xref-xfile-alist)
          (let ((found (info-xref-goto-node-p file)))
            (push (cons file found) info-xref-xfile-alist)
            (unless found
              (info-xref-output "Not available to check: %s\n" file))))
        ;; if the file exists, try the node
        (when (cdr (assoc file info-xref-xfile-alist))
          (if (info-xref-goto-node-p node)
              (setq info-xref-good (1+ info-xref-good))
            (setq info-xref-bad (1+ info-xref-bad))
            (info-xref-output "No such node: %s\n" node)))))))

(defun info-xref-output (str &rest args)
  "Emit a `format'-ed message STR+ARGS to the info-xref output buffer."
  (with-current-buffer info-xref-results-buffer
    (insert info-xref-filename-heading
            (apply 'format str args))
    (setq info-xref-filename-heading "")
    ;; all this info-xref can be pretty slow, display now so the user can
    ;; see some progress
    (sit-for 0)))

;; When asking Info-goto-node to fork, *info* needs to be the current
;; buffer, otherwise it seems to clone the current buffer but then do the
;; goto-node in plain *info*.
;;
;; We only fork if *info* already exists, if it doesn't then we can create
;; and destroy just that instead of a new name.
;;
;; If Info-goto-node can't find the file, then no new buffer is created.  If
;; it finds the file but not the node, then a buffer is created.  Handle
;; this difference by checking before killing.
;;
(defun info-xref-goto-node-p (node)
  "Return t if it's possible to go to the given NODE."
  (let ((oldbuf (current-buffer)))
    (save-excursion
      (save-window-excursion
        (prog1
            (condition-case err
                (progn
                  (Info-goto-node node
                                  (when (get-buffer "*info*")
                                    (set-buffer "*info*")
                                    "xref - temporary"))
                  t)
              (error nil))
          (unless (equal (current-buffer) oldbuf)
            (kill-buffer (current-buffer))))))))

;;;###autoload
(defun info-xref-check-all-custom ()
  "Check info references in all customize groups and variables.
`custom-manual' and `info-link' entries in the `custom-links' list are checked.

`custom-load' autoloads for all symbols are loaded in order to get all the
link information.  This will be a lot of lisp packages loaded, and can take
quite a while."

  (interactive)
  (pop-to-buffer info-xref-results-buffer t)
  (erase-buffer)
  (let ((info-xref-filename-heading ""))

    ;; `custom-load-symbol' is not used, since it quietly ignores errors,
    ;; but we want to show them (since they may mean incomplete checking).
    ;;
    ;; Just one pass through mapatoms is made.  There shouldn't be any new
    ;; custom-loads setup by packages loaded.
    ;;
    (info-xref-output "Loading custom-load autoloads ...\n")
    (require 'cus-start)
    (require 'cus-load)
    (let ((viper-mode nil)) ;; tell viper.el not to ask about viperizing
      (mapatoms
       (lambda (symbol)
         (dolist (load (get symbol 'custom-loads))
           (cond ((symbolp load)
                  (condition-case cause (require load)
                    (error
                     (info-xref-output "Symbol `%s': cannot require '%s: %s\n"
                                       symbol load cause))))
                 ;; skip if previously loaded
                 ((assoc load load-history))
                 ((assoc (locate-library load) load-history))
                 (t
                  (condition-case cause (load load)
                    (error
                     (info-xref-output "Symbol `%s': cannot load \"%s\": %s\n"
                                       symbol load cause)))))))))

    ;; Don't bother to check whether the info file exists as opposed to just
    ;; a missing node.  If you have the lisp then you should have the
    ;; documentation, so missing node name will be the usual fault.
    ;;
    (info-xref-output "\nChecking custom-links references ...\n")
    (let ((good 0)
          (bad  0))
      (mapatoms
       (lambda (symbol)
         (dolist (link (get symbol 'custom-links))
           (when (memq (car link) '(custom-manual info-link))
	     ;; skip :tag part of (custom-manual :tag "Foo" "(foo)Node")
	     (if (eq :tag (cadr link))
		 (setq link (cddr link)))
	     (if (info-xref-goto-node-p (cadr link))
                 (setq good (1+ good))
               (setq bad (1+ bad))
               ;; symbol-file gives nil for preloaded variables, would need
               ;; to copy what describe-variable does to show the right place
               (info-xref-output "Symbol `%s' (in %s): cannot goto node: %s\n"
                                 symbol (symbol-file symbol) (cadr link)))))))
      (info-xref-output "%d good, %d bad\n" good bad))))

(provide 'info-xref)

;; arch-tag: 69d4d528-69ed-4cc2-8eb4-c666a0c1d5ac
;;; info-xref.el ends here