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|
;;; info-xref.el --- check external references in an Info document.
;; Copyright 2003 Free Software Foundation, Inc
;;
;; Author: Kevin Ryde <user42@zip.com.au>
;; Keywords: docs
;;
;; info-xref.el 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 2, or (at your option) any later
;; version.
;;
;; info-xref.el 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 can get a copy of the GNU General Public License online at
;; http://www.gnu.org/licenses/gpl.txt, or you should have one in the file
;; COPYING which comes with GNU Emacs and other GNU programs. Failing that,
;; write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; 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.
;;; Install:
;; Put info-xref.el somewhere in your `load-path', and in your .emacs put
;;
;; (autoload 'info-xref-check "info-xref" nil t)
;; (autoload 'info-xref-check-all "info-xref" nil t)
;;
;; then
;;
;; M-x info-xref-check
;;
;; and enter an info file name.
;;; Emacsen:
;; Designed for use with GNU Emacs 21.
;;; History:
;; Version 1 - the first version.
;;; 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 - current top-level filename, eg. /usr/info/foo.info.gz
;;
;; info-xref-filename-header - a heading message for the current top-level
;; filename, or "" when it's been printed.
;;
;; info-xref-good - count of good cross references.
;;
;; info-xref-bad - count of bad cross references.
;;
;; 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.)
(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)))
;; 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 (format "Not available to check: %s\n" file)))))
;; if the file exists, try the node, if we haven't before
(when (cdr (assoc file info-xref-xfile-alist))
(unless (assoc node 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 (format "No such node: %s\n" node))))))))
(defun info-xref-output (str)
"Emit STR as an info-xref result message."
(with-current-buffer info-xref-results-buffer
(insert info-xref-filename-heading str)
(setq info-xref-filename-heading "")))
;; 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))))))))
(provide 'info-xref)
;;; info-xref.el ends here
|
