;;; lisp-mnt.el --- minor mode for Emacs Lisp maintainers

;; Copyright (C) 1992, 1994, 1997, 2000, 2001 Free Software Foundation, Inc.

;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
;; Maintainer: FSF
;; Created: 14 Jul 1992
;; Keywords: docs
;; X-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 2, 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,  Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, 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 multiple 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.  This
;; may be 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 Emacs Lisp code related to a topic.
;;
;;    * X-Bogus-Bureaucratic-Cruft line --- this is a joke and an example
;; of a comment header.  Headers starting with `X-' should never be used
;; for any real purpose; this is the way to safely add random headers
;; without invoking the wrath of any program.
;;
;;    * 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 Lisp 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:

;;; Variables:

(defgroup lisp-mnt nil
  "Minor mode for Emacs Lisp maintainers."
  :prefix "lm-"
  :group 'maint)

(defcustom lm-header-prefix "^;+[ \t]+\\(@(#)\\)?[ \t]*\\$?"
  "Prefix that is ignored before the tag.
For example, you can write the 1st line synopsis string and headers like this
in your Lisp package:

   ;; @(#) package.el -- package description
   ;;
   ;; @(#) $Maintainer:   Person Foo Bar $

The @(#) construct is used by unix what(1) and
then $identifier: doc string $ is used by GNU ident(1)"
  :type 'regexp
  :group 'lisp-mnt)

(defcustom lm-copyright-prefix "^;+[ \t]+Copyright (C) "
  "Prefix that is ignored before the dates in a copyright."
  :type 'regexp
  :group 'lisp-mnt)

(defcustom lm-comment-column 16
  "Column used for placing formatted output."
  :type 'integer
  :group 'lisp-mnt)

(defcustom lm-commentary-header "Commentary\\|Documentation"
  "Regexp which matches start of documentation section."
  :type 'regexp
  :group 'lisp-mnt)

(defcustom lm-history-header "Change Log\\|History"
  "Regexp which matches the start of code log section."
  :type 'regexp
  :group 'lisp-mnt)

;;; Functions:

;; These functions all parse the headers of the current buffer

(defun lm-get-header-re (header &optional mode)
  "Return regexp for matching HEADER.
If called with optional MODE and with value `section',
return section regexp instead."
  (if (eq mode 'section)
      (concat "^;;;;* " header ":[ \t]*$")
    (concat lm-header-prefix header "[ \t]*:[ \t]*")))

(defun lm-get-package-name ()
  "Return package name by looking at the first line."
  (save-excursion
    (goto-char (point-min))
    (if (and (looking-at (concat lm-header-prefix))
	     (progn (goto-char (match-end 0))
		    (looking-at "\\([^\t ]+\\)")
		    (match-end 1)))
	(match-string-no-properties 1))))

(defun lm-section-mark (header &optional after)
  "Return the buffer location of a given section start marker.
The HEADER is the section mark string to search for.
If AFTER is non-nil, return the location of the next line."
  (save-excursion
    (let ((case-fold-search t))
      (goto-char (point-min))
      (if (re-search-forward (lm-get-header-re header 'section) nil t)
	  (progn
	    (beginning-of-line)
	    (if after (forward-line 1))
	    (point))))))

(defsubst lm-code-mark ()
  "Return the buffer location of the `Code' start marker."
  (lm-section-mark "Code"))

(defsubst lm-commentary-mark ()
  "Return the buffer location of the `Commentary' start marker."
  (lm-section-mark lm-commentary-header))

(defsubst lm-history-mark ()
  "Return the buffer location of the `History' start marker."
  (lm-section-mark lm-history-header))

(defsubst lm-copyright-mark ()
  "Return the buffer location of the `Copyright' line."
  (save-excursion
    (let ((case-fold-search t))
      (goto-char (point-min))
      (if (re-search-forward lm-copyright-prefix nil t)
	  (point))))
  )

(defun lm-header (header)
  "Return the contents of the header named HEADER."
  (goto-char (point-min))
  (let ((case-fold-search t))
    (when (and (re-search-forward (lm-get-header-re header) (lm-code-mark) t)
	       ;;   RCS ident likes format "$identifier: data$"
	       (looking-at
		(if (save-excursion
		      (skip-chars-backward "^$" (match-beginning 0))
		      (= (point) (match-beginning 0)))
		    "[^\n]+" "[^$\n]+")))
      (match-string-no-properties 0))))

(defun lm-header-multiline (header)
  "Return the contents of the header named HEADER, with continuation lines.
The returned value is a list of strings, one per line."
  (save-excursion
    (goto-char (point-min))
    (let ((res (lm-header header)))
      (when res
	(setq res (list res))
	(forward-line 1)
	(while (and (or (looking-at (concat lm-header-prefix "[\t ]+"))
			(and (not (looking-at
				   (lm-get-header-re "\\sw\\(\\sw\\|\\s_\\)*")))
			     (looking-at lm-header-prefix)))
		    (goto-char (match-end 0))
		    (looking-at ".+"))
	  (setq res (cons (match-string-no-properties 0) res))
	  (forward-line 1)))
      (nreverse res))))

;; These give us smart access to the header fields and commentary

(defmacro lm-with-file (file &rest body)
  "Make a buffer with FILE current, and execute BODY.
If FILE isn't in a buffer, load it in, and kill it after BODY is executed."
  (let ((filesym (make-symbol "file")))
    `(save-excursion
       (let ((,filesym ,file))
	 (if ,filesym (set-buffer (find-file-noselect ,filesym)))
	 (prog1 (progn ,@body)
	   (if (and ,filesym (not (get-buffer-window (current-buffer) t)))
	       (kill-buffer (current-buffer))))))))
(put 'lm-with-file 'lisp-indent-function 1)
(put 'lm-with-file 'edebug-form-spec t)

(defun lm-crack-copyright (&optional file)
  "Return the copyright holder, and a list of copyright years.
Use the current buffer if FILE is nil.
Return argument is of the form (\"HOLDER\" \"YEAR1\" ... \"YEARN\")"
  (lm-with-file file
    (goto-char (lm-copyright-mark))
    (let ((holder nil)
	  (years nil)
	  (end (line-end-position)))
      (while (re-search-forward "\\([0-9]+\\),? +" end t)
	(setq years (cons (match-string-no-properties 1) years)))
      (if (looking-at ".*$")
	  (setq holder (match-string-no-properties 0)))
      (cons holder (nreverse years))
    )))

(defun lm-summary (&optional file)
  "Return the one-line summary of file FILE, or current buffer if FILE is nil."
  (lm-with-file file
    (goto-char (point-min))
    (if (and (looking-at lm-header-prefix)
	     (progn (goto-char (match-end 0))
		    (looking-at "[^ ]+[ \t]+--+[ \t]+\\(.*\\)")))
	(let ((summary (match-string-no-properties 1)))
	  ;; Strip off -*- specifications.
	  (if (string-match "[ \t]*-\\*-.*-\\*-" summary)
	      (substring summary 0 (match-beginning 0))
	    summary)))))

(defun lm-crack-address (x)
  "Split up an email address X into full name and real email address.
The value is a cons of the form (FULLNAME . ADDRESS)."
  (cond ((string-match "\\(.+\\) [(<]\\(\\S-+@\\S-+\\)[>)]" x)
	 (cons (match-string 1 x)
	       (match-string 2 x)))
	((string-match "\\(\\S-+@\\S-+\\) [(<]\\(.*\\)[>)]" x)
	 (cons (match-string 2 x)
	       (match-string 1 x)))
	((string-match "\\S-+@\\S-+" x)
	 (cons nil x))
	(t
	 (cons x nil))))

(defun lm-authors (&optional file)
  "Return the author list of file FILE, or current buffer if FILE is nil.
Each element of the list is a cons; the car is the full name,
the cdr is an email address."
  (lm-with-file file
    (let ((authorlist (lm-header-multiline "author")))
      (mapcar 'lm-crack-address authorlist))))

(defun lm-maintainer (&optional file)
  "Return the maintainer of file FILE, or current buffer if FILE is nil.
The return value has the form (NAME . ADDRESS)."
  (lm-with-file file
    (let ((maint (lm-header "maintainer")))
      (if maint
	  (lm-crack-address maint)
	(car (lm-authors))))))

(defun lm-creation-date (&optional file)
  "Return the created date given in file FILE, or current buffer if FILE is nil."
  (lm-with-file file
    (lm-header "created")))

(defun lm-last-modified-date (&optional file iso-date)
  "Return the modify-date given in file FILE, or current buffer if FILE is nil.
ISO-DATE non-nil means return the date in ISO 8601 format."
  (lm-with-file file
    (when (progn (goto-char (point-min))
		 (re-search-forward
		  "\\$[I]d: [^ ]+ [^ ]+ \\([^/]+\\)/\\([^/]+\\)/\\([^ ]+\\) "
		  (lm-code-mark) t))
      (let ((dd (match-string 3))
	    (mm (match-string 2))
	    (yyyy (match-string 1)))
	(if iso-date
	    (format "%s-%s-%s" yyyy mm dd)
	  (format "%s %s %s"
		  dd
		  (nth (string-to-int mm)
		       '("" "Jan" "Feb" "Mar" "Apr" "May" "Jun"
			 "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"))
		  yyyy))))))

(defun lm-version (&optional file)
  "Return the version listed in file FILE, or current buffer if FILE is nil.
This can be found in an RCS or SCCS header."
  (lm-with-file file
    (or (lm-header "version")
	(let ((header-max (lm-code-mark)))
	  (goto-char (point-min))
	  (cond
	   ;; Look for an RCS header
	   ((re-search-forward "\\$[I]d: [^ ]+ \\([^ ]+\\) " header-max t)
	    (match-string-no-properties 1))
	   ((re-search-forward "\\$Revision: +\\([^ ]+\\) " header-max t)
	    (match-string-no-properties 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)
	    (match-string-no-properties 1)))))))

(defun lm-keywords (&optional file)
  "Return the keywords given in file FILE, or current buffer if FILE is nil."
  (lm-with-file file
    (let ((keywords (lm-header "keywords")))
      (and keywords (downcase keywords)))))

(defun lm-keywords-list (&optional file)
  "Return list of keywords given in file FILE."
  (let ((keywords (lm-keywords file)))
    (if keywords
	(split-string keywords ",?[ \t]"))))

(defun lm-keywords-finder-p (&optional file)
  "Return non-nil if any keywords in FILE are known to finder."
  (require 'finder)
  (let ((keys (lm-keywords-list file)))
    (catch 'keyword-found
      (while keys
	(if (assoc (intern (car keys)) finder-known-keywords)
	    (throw 'keyword-found t))
	(setq keys (cdr keys)))
      nil)))

(defun lm-adapted-by (&optional file)
  "Return the adapted-by names in file FILE, or current buffer if FILE is nil.
This is the name of the person who cleaned up this package for
distribution."
  (lm-with-file file
    (lm-header "adapted-by")))

(defun lm-commentary (&optional file)
  "Return the commentary in file FILE, or current buffer if FILE is nil.
The value is returned as a string.  In the file, the commentary starts
with the tag `Commentary' or `Documentation' and ends with one of the
tags `Code', `Change Log' or `History'."
  (lm-with-file file
    (let ((commentary (lm-commentary-mark))
	  (change-log (lm-history-mark))
	  (code (lm-code-mark)))
      (cond
       ((and commentary change-log)
	(buffer-substring-no-properties commentary change-log))
       ((and commentary code)
	(buffer-substring-no-properties commentary code))))))

;;; Verification and synopses

(defun lm-insert-at-column (col &rest strings)
  "Insert, at column COL, list of STRINGS."
  (if (> (current-column) col) (insert "\n"))
  (move-to-column col t)
  (apply 'insert strings))

(defun lm-verify (&optional file showok verb)
  "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 in a
temporary buffer.
Optional argument SHOWOK indicates that \"OK\" be displayed in the temp buffer.
Optional argument VERB specifies verbosity."
  (interactive)
  (let* ((verb (or verb (interactive-p)))
	 (ret (and verb "Ok."))
	 name)
    (if (and file (file-directory-p file))
	(setq ret
	      (with-temp-buffer
		(mapcar
		 (lambda (f)
		   (if (string-match ".*\\.el\\'" f)
		       (let ((status (lm-verify f)))
			 (insert f ":")
			 (if status
			     (lm-insert-at-column lm-comment-column status
						  "\n")
			   (if showok
			       (lm-insert-at-column lm-comment-column
						    "OK\n"))))))
		 (directory-files file))))
      (lm-with-file file
	(setq name (lm-get-package-name))
	(setq ret
	      (cond
	       ((null name)
		"Can't find a package NAME")
	       ((not (lm-authors))
		"Author: tag missing.")
	       ((not (lm-maintainer))
		"Maintainer: tag missing.")
	       ((not (lm-summary))
		"Can't find a one-line 'Summary' description")
	       ((not (lm-keywords))
		"Keywords: tag missing.")
	       ((not (lm-keywords-finder-p))
		"Keywords: no valid finder keywords.")
	       ((not (lm-commentary-mark))
		"Can't find a 'Commentary' section marker.")
	       ((not (lm-history-mark))
		"Can't find a 'History' section marker.")
	       ((not (lm-code-mark))
		"Can't find a 'Code' section marker")
	       ((progn
		  (goto-char (point-max))
		  (not
		   (re-search-backward
		    (concat "^;;;[ \t]+" name "[ \t]+ends here[ \t]*$"
			    "\\|^;;;[ \t]+ End of file[ \t]+" name)
		    nil t)))
		(format "Can't find a footer line for [%s]" name))
	       ((not (and (lm-copyright-mark) (lm-crack-copyright)))
		"Can't find a valid Copyright")
	       ((not (string-match "Free Software Foundation"
				   (car (lm-crack-copyright))))
		"Copyright Holder is not the Free Software Foundation.")
	       (t
		ret)))))
    (if verb
	(message ret))
    ret))

(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 in
a temporary buffer.  If SHOWALL is non-nil, also generate a line for files
which do not include a recognizable synopsis."
  (interactive
   (list
    (read-file-name "Synopsis for (file or dir): ")))

  (if (and file (file-directory-p file))
      (with-temp-buffer
	(mapcar
	 (lambda (f)
	   (if (string-match "\\.el\\'" f)
	       (let ((syn (lm-synopsis f)))
		 (if syn
		     (progn
		       (insert f ":")
		       (lm-insert-at-column lm-comment-column syn "\n"))
		   (when showall
		     (insert f ":")
		     (lm-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)))))))

(eval-when-compile (defvar report-emacs-bug-address))

(defun lm-report-bug (topic)
  "Report a bug in the package currently being visited to its maintainer.
Prompts for bug subject TOPIC.  Leaves you in a mail buffer."
  (interactive "sBug Subject: ")
  (require 'emacsbug)
  (let ((package (lm-get-package-name))
	(addr (lm-maintainer))
	(version (lm-version)))
    (compose-mail (if addr
		      (concat (car addr) " <" (cdr addr) ">")
		    report-emacs-bug-address)
		  topic)
    (goto-char (point-max))
    (insert "\nIn " package)
    (if version
	(insert " version " version))
    (newline 2)
    (message
     (substitute-command-keys "Type \\[mail-send] to send bug report."))))

(provide 'lisp-mnt)

;;; lisp-mnt.el ends here