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+;;; lisp-mnt.el --- minor mode for Emacs Lisp maintainers
+
+;; Copyright (C) 1992 Free Software Foundation, Inc.
+
+;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
+;; Maintainer: Eric S. Raymond <esr@snark.thyrsus.com>
+;; Created: 14 Jul 1992
+;; Version: 1.2
+;; Keywords: docs
+;; Bogus-Bureaucratic-Cruft: Gruad will get you if you don't watch out!
+
+;; 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 1, 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; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; This minor mode adds some services to Emacs-Lisp editing mode.
+;;
+;; First, it knows about the header conventions for library packages.
+;; One entry point supports generating synopses from a library directory.
+;; Another can be used to check for missing headers in library files.
+;; 
+;; Another entry point automatically addresses bug mail to a package's
+;; maintainer or author.
+
+;; This file can be loaded by your lisp-mode-hook.  Have it (require 'lisp-mnt)
+
+;; This file is an example of the header conventions.  Note the following
+;; features:
+;; 
+;;    * Header line --- makes it possible to extract a one-line summary of
+;; the package's uses automatically for use in library synopses, KWIC
+;; indexes and the like.
+;; 
+;;    Format is three semicolons, followed by the filename, followed by
+;; three dashes, followed by the summary.  All fields space-separated.
+;; 
+;;    * Author line --- contains the name and net address of at least
+;; the principal author.
+;; 
+;;    If there are multible authors, they should be listed on continuation
+;; lines led by ;;<TAB>, like this:
+;; 
+;; ;; Author: Ashwin Ram <Ram-Ashwin@cs.yale.edu>
+;; ;;   Dave Sill <de5@ornl.gov>
+;; ;;   David Lawrence <tale@pawl.rpi.edu>
+;; ;;   Noah Friedman <friedman@ai.mit.edu>
+;; ;;   Joe Wells <jbw@maverick.uswest.com>
+;; ;;   Dave Brennan <brennan@hal.com>
+;; ;;   Eric Raymond <esr@snark.thyrsus.com>
+;; 
+;; This field may have some special values; notably "FSF", meaning
+;; "Free Software Foundation".
+;; 
+;;    * Maintainer line --- should be a single name/address as in the Author
+;; line, or an address only, or the string "FSF".  If there is no maintainer
+;; line, the person(s) in the Author field are presumed to be it.  The example
+;; in this file is mildly bogus because the maintainer line is redundant.
+;;    The idea behind these two fields is to be able to write a lisp function
+;; that does "send mail to the author" without having to mine the name out by
+;; hand. Please be careful about surrounding the network address with <> if
+;; there's also a name in the field.
+;; 
+;;    * Created line --- optional, gives the original creation date of the
+;; file.  For historical interest, basically.
+;; 
+;;    * Version line --- intended to give the reader a clue if they're looking
+;; at a different version of the file than the one they're accustomed to.  Not
+;; needed if you have an RCS or SCCS header.
+;; 
+;;    * Adapted-By line --- this is for FSF's internal use.  The person named
+;; in this field was the one responsible for installing and adapting the
+;; package for the distribution.  (This file doesn't have one because the
+;; author *is* one of the maintainers.)
+;; 
+;;    * Keywords line --- used by the finder code (now under construction)
+;; for finding elisp code related to a topic.
+;;
+;;    * Bogus-Bureaucratic-Cruft line --- this is a joke.  I figured I should
+;; satirize this design before someone else did.  Also, it illustrates the
+;; possibility that other headers may be added in the future for new purposes.
+;;
+;;    * Commentary line --- enables lisp code to find the developer's and
+;; maintainers' explanations of the package internals.
+;; 
+;;    * Change log line --- optional, exists to terminate the commentary
+;; section and start a change-log part, if one exists.
+;; 
+;;    * Code line --- exists so elisp can know where commentary and/or
+;; change-log sections end.
+;; 
+;;    * Footer line --- marks end-of-file so it can be distinguished from
+;; an expanded formfeed or the results of truncation.
+
+;;; Change Log:
+
+;; Tue Jul 14 23:44:17 1992     ESR
+;;      * Created.
+
+;;; Code:
+
+(require 'picture)              ; provides move-to-column-force
+
+;; These functions all parse the headers of the current buffer
+
+(defun lm-section-mark (hd)
+  ;; Return the buffer location of a given section start marker
+  (save-excursion
+    (let ((case-fold-search t))
+      (goto-char (point-min))
+      (if (re-search-forward (concat "^;;; " hd ":$") nil t)
+          (progn
+            (beginning-of-line)
+            (point))
+        nil))))
+
+(defun lm-code-mark ()
+  ;; Return the buffer location of the code start marker
+  (lm-section-mark "Code"))
+
+(defun lm-header (hd)
+  ;; Return the contents of a named header
+    (goto-char (point-min))
+    (let ((case-fold-search t))
+      (if (re-search-forward
+           (concat "^;; " hd ": \\(.*\\)") (lm-code-mark) t)
+          (buffer-substring (match-beginning 1) (match-end 1))
+        nil)))
+
+(defun lm-header-multiline (hd)
+  ;; Return the contents of a named header, with possible continuation lines.
+  ;; Note -- the returned value is a list of strings, one per line.
+  (save-excursion
+    (goto-char (point-min))
+    (let ((res (save-excursion (lm-header hd))))
+      (if res
+          (progn
+            (forward-line 1)
+            (setq res (list res))
+            (while (looking-at "^;;\t\\(.*\\)")
+              (setq res (cons (buffer-substring
+                               (match-beginning 1)
+                               (match-end 1))
+                              res))
+              (forward-line 1))
+            ))
+      res)))
+
+;; These give us smart access to the header fields and commentary
+
+(defun lm-summary (&optional file)
+  ;; Return the buffer's or FILE's one-line summary.
+  (save-excursion
+    (if file
+        (find-file file))
+    (goto-char (point-min))
+    (prog1
+      (if (looking-at "^;;; [^ ]+ --- \\(.*\\)")
+          (buffer-substring (match-beginning 1) (match-end 1)))
+      (if file
+          (kill-buffer (current-buffer)))
+      )))
+
+(defun lm-authors (&optional file)
+  ;; Return the buffer's or FILE's author list.
+  (save-excursion
+    (if file
+        (find-file file))
+    (prog1
+        (lm-header-multiline "author")
+      (if file
+          (kill-buffer (current-buffer)))
+    )))
+
+(defun lm-maintainer (&optional file)
+  ;; Get a package's bug-report & maintenance address.  Parse it out of FILE,
+  ;; or the current buffer if FILE is nil.
+  ;; This may be a name-address pair, or an address by itself,
+  (save-excursion
+    (if file
+        (find-file file))
+    (prog1
+        (let ((raw-address
+               (or
+                (save-excursion (lm-header "maintainer"))
+                (car (lm-authors)))))
+          (cond ((string-match "[^<]<\\([^>]+\\)>" raw-address)
+                 (substring raw-address  (match-beginning 1) (match-end 1)))
+                (t raw-address))
+          )
+      (if file
+          (kill-buffer (current-buffer)))
+      )))
+
+(defun lm-creation-date (&optional file)
+  ;; Return a package's creation date, if any.  Parse it out of FILE,
+  ;; or the current buffer if FILE is nil.
+  (save-excursion
+    (if file
+        (find-file file))
+    (prog1
+        (lm-header "created")
+      (if file
+          (kill-buffer (current-buffer)))
+      )))
+
+
+(defun lm-last-modified-date (&optional file)
+  ;; Return a package's last-modified date, if you can find one.
+  (save-excursion 
+    (if file
+        (find-file file))
+    (prog1
+         (if (progn
+               (goto-char (point-min))
+               (re-search-forward
+                "\\$Id: [^ ]+ [^ ]+ \\([^/]+\\)/\\([^/]+\\)/\\([^ ]+\\) "
+                (lm-code-mark) t))
+             (format "%s %s %s"
+                     (buffer-substring (match-beginning 3) (match-end 3))
+                     (nth (string-to-int 
+                           (buffer-substring (match-beginning 2) (match-end 2)))
+                          '("" "Jan" "Feb" "Mar" "Apr" "May" "Jun"
+                            "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"))
+                     (buffer-substring (match-beginning 1) (match-end 1))
+                     )))
+      (if file
+          (kill-buffer (current-buffer)))
+      ))
+
+(defun lm-version (&optional file)
+  ;; Return the package's version field.
+  ;; If none, look for an RCS or SCCS header to crack it out of.
+  (save-excursion 
+    (if file
+        (find-file file))
+    (prog1
+        (or
+         (lm-header "version")
+         (let ((header-max (lm-code-mark)))
+           (goto-char (point-min))
+           (cond
+            ;; Look for an RCS header
+            ((re-search-forward "\\$Id: [^ ]+ \\([^ ]+\\) " header-max t)
+             (buffer-substring (match-beginning 1) (match-end 1)))
+
+            ;; Look for an SCCS header
+            ((re-search-forward 
+              (concat
+               (regexp-quote "@(#)")
+               (regexp-quote (file-name-nondirectory (buffer-file-name)))
+               "\t\\([012345679.]*\\)")
+              header-max t)
+             (buffer-substring (match-beginning 1) (match-end 1)))
+
+            (t nil))))
+      (if file
+          (kill-buffer (current-buffer)))
+      )))
+
+(defun lm-keywords (&optional file)
+  ;; Return the header containing the package's topic keywords.
+  ;; Parse them out of FILE, or the current buffer if FILE is nil.
+  (save-excursion
+    (if file
+        (find-file file))
+    (prog1
+        (let ((keywords (lm-header "keywords")))
+          (and keywords (downcase keywords)))
+      (if file
+          (kill-buffer (current-buffer)))
+      )))
+
+(defun lm-adapted-by (&optional file)
+  ;; Return the name or code of the person who cleaned up this package
+  ;; for distribution.  Parse it out of FILE, or the current buffer if
+  ;; FILE is nil.
+  (save-excursion
+    (if file
+        (find-file file))
+    (prog1
+        (lm-header "adapted-by")
+      (if file
+          (kill-buffer (current-buffer)))
+      )))
+
+(defun lm-commentary-region (&optional file)
+  ;; Return a pair of character locations enclosing the commentary region.
+  (save-excursion
+    (if file
+        (find-file file))
+    (prog1
+        (let ((commentary (lm-section-mark "Commentary"))
+              (change-log (lm-section-mark "Change Log"))
+              (code (lm-section-mark "Code")))
+          (if commentary
+              (if change-log
+                  (cons commentary change-log)
+                (cons commentary code)))
+          )
+      (if file
+          (kill-buffer (current-buffer)))
+      )))
+
+;;; Verification and synopses
+
+(defun insert-at-column (col &rest pieces)
+   (if (> (current-column) col) (insert "\n"))
+   (move-to-column-force col)
+   (apply 'insert pieces))
+
+(defconst lm-comment-column 16)
+
+(defun lm-verify (&optional file showok)
+  "Check that the current buffer (or FILE if given) is in proper format.
+If FILE is a directory, recurse on its files and generate a report into
+a temporary buffer."
+  (if (and file (file-directory-p file))
+      (progn
+        (switch-to-buffer (get-buffer-create "*lm-verify*"))
+        (erase-buffer)
+        (mapcar
+         '(lambda (f)
+            (if (string-match ".*\\.el$" f)
+                (let ((status (lm-verify f)))
+                  (if status
+                      (progn
+                        (insert f ":")
+                        (insert-at-column lm-comment-column status "\n"))
+                    (and showok
+                         (progn
+                           (insert f ":")
+                           (insert-at-column lm-comment-column "OK\n")))))))
+        (directory-files file))
+    )
+  (save-excursion
+    (if file
+        (find-file file))
+    (prog1
+        (cond
+         ((not (lm-summary))
+          "Can't find a package summary")
+         ((not (lm-code-mark))
+          "Can't find a code section marker")
+         ((progn
+            (goto-char (point-max))
+            (forward-line -1)
+            (looking-at (concat ";;; " file "ends here")))
+          "Can't find a footer line")
+         )
+      (if file
+          (kill-buffer (current-buffer)))
+      ))))
+
+(defun lm-synopsis (&optional file showall)
+  "Generate a synopsis listing for the buffer or the given FILE if given.
+If FILE is a directory, recurse on its files and generate a report into
+a temporary buffer.  If SHOWALL is on, also generate a line for files
+which do not include a recognizable synopsis."
+  (if (and file (file-directory-p file))
+      (progn
+        (switch-to-buffer (get-buffer-create "*lm-verify*"))
+        (erase-buffer)
+        (mapcar
+         '(lambda (f)
+            (if (string-match ".*\\.el$" f)
+                (let ((syn (lm-synopsis f)))
+                  (if syn
+                      (progn
+                        (insert f ":")
+                        (insert-at-column lm-comment-column syn "\n"))
+                    (and showall
+                         (progn
+                           (insert f ":")
+                           (insert-at-column lm-comment-column "NA\n")))))))
+         (directory-files file))
+        )
+    (save-excursion
+      (if file
+          (find-file file))
+      (prog1
+          (lm-summary)
+        (if file
+            (kill-buffer (current-buffer)))
+        ))))
+
+(defun lm-report-bug (topic)
+  "Report a bug in the package currently being visited to its maintainer.
+Prompts for bug subject.  Leaves you in a mail buffer."
+  (let ((package (buffer-name))
+        (addr (lm-maintainer))
+        (version (lm-version)))
+    ;; We do this in order to avoid duplicating the general bug address here
+    (if (or (not addr) (string= "FSF"))
+        (progn
+          (load-library "emacsbug.el")
+          (emacsbug (format "%s --- %s" package topic))))
+    (interactive "sBug Subject: ")
+    (mail nil addr topic)
+    (goto-char (point-max))
+    (insert "\nIn "
+            package
+            (and version (concat " version " version))
+            "\n\n")
+    (message
+     (substitute-command-keys "Type \\[mail-send] to send bug report."))))
+
+(provide 'lisp-mnt)
+
+;;; lisp-mnt.el ends here