;;; autoload.el --- maintain autoloads in loaddefs.el

;; Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2001
;;   Free Software Foundation, Inc.

;; Author: Roland McGrath <roland@gnu.org>
;; Keywords: maint

;; 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 code helps GNU Emacs maintainers keep the loaddefs.el file up to
;; date.  It interprets magic cookies of the form ";;;###autoload" in
;; lisp source files in various useful ways.  To learn more, read the
;; source; if you're going to use this, you'd better be able to.

;;; Code:

(require 'lisp-mode)			;for `doc-string-elt' properties.


(defvar generated-autoload-file "loaddefs.el"
   "*File \\[update-file-autoloads] puts autoloads into.
A `.el' file can set this in its local variables section to make its
autoloads go somewhere else.  The autoload file is assumed to contain a
trailer starting with a FormFeed character.")

(defconst generate-autoload-cookie ";;;###autoload"
  "Magic comment indicating the following form should be autoloaded.
Used by \\[update-file-autoloads].  This string should be
meaningless to Lisp (e.g., a comment).

This string is used:

;;;###autoload
\(defun function-to-be-autoloaded () ...)

If this string appears alone on a line, the following form will be
read and an autoload made for it.  If there is further text on the line,
that text will be copied verbatim to `generated-autoload-file'.")

(defconst generate-autoload-section-header "\f\n;;;### "
  "String that marks the form at the start of a new file's autoload section.")

(defconst generate-autoload-section-trailer "\n;;;***\n"
  "String which indicates the end of the section of autoloads for a file.")

(defconst generate-autoload-section-continuation ";;;;;; "
  "String to add on each continuation of the section header form.")

(defun make-autoload (form file)
  "Turn FORM into an autoload or defvar for source file FILE.
Returns nil if FORM is not a special autoload form (i.e. a function definition
or macro definition or a defcustom)."
  (let ((car (car-safe form)) expand)
    (cond
     ;; For complex cases, try again on the macro-expansion.
     ((and (memq car '(easy-mmode-define-global-mode
		       easy-mmode-define-minor-mode define-minor-mode))
	   (setq expand (let ((load-file-name file)) (macroexpand form)))
	   (eq (car expand) 'progn)
	   (memq :autoload-end expand))
      (let ((end (memq :autoload-end expand)))
	;; Cut-off anything after the :autoload-end marker.
	(setcdr end nil)
	(cons 'progn
	      (mapcar (lambda (form) (make-autoload form file))
		      (cdr expand)))))

     ;; For special function-like operators, use the `autoload' function.
     ((memq car '(defun define-skeleton defmacro define-derived-mode
		   define-generic-mode easy-mmode-define-minor-mode
		   easy-mmode-define-global-mode
		   define-minor-mode defun* defmacro*))
      (let* ((macrop (memq car '(defmacro defmacro*)))
	     (name (nth 1 form))
	     (body (nthcdr (get car 'doc-string-elt) form))
	     (doc (if (stringp (car body)) (pop body))))
	;; `define-generic-mode' quotes the name, so take care of that
	(list 'autoload (if (listp name) name (list 'quote name)) file doc
	      (or (and (memq car '(define-skeleton define-derived-mode
				    define-generic-mode
				    easy-mmode-define-global-mode
				    easy-mmode-define-minor-mode
				    define-minor-mode)) t)
		  (eq (car-safe (car body)) 'interactive))
	      (if macrop (list 'quote 'macro) nil))))

     ;; Convert defcustom to a simpler (and less space-consuming) defvar,
     ;; but add some extra stuff if it uses :require.
     ((eq car 'defcustom)
      (let ((varname (car-safe (cdr-safe form)))
	    (init (car-safe (cdr-safe (cdr-safe form))))
	    (doc (car-safe (cdr-safe (cdr-safe (cdr-safe form)))))
	    (rest (cdr-safe (cdr-safe (cdr-safe (cdr-safe form))))))
	(if (not (plist-get rest :require))
	    `(defvar ,varname ,init ,doc)
	  `(progn
	     (defvar ,varname ,init ,doc)
	     (custom-add-to-group ,(plist-get rest :group)
				  ',varname 'custom-variable)
	     (custom-add-load ',varname
			      ,(plist-get rest :require))))))

     ;; nil here indicates that this is not a special autoload form.
     (t nil))))

;;; Forms which have doc-strings which should be printed specially.
;;; A doc-string-elt property of ELT says that (nth ELT FORM) is
;;; the doc-string in FORM.
;;; Those properties are now set in lisp-mode.el.


(defun autoload-trim-file-name (file)
  ;; Returns a relative pathname of FILE
  ;; starting from the directory that loaddefs.el is in.
  ;; That is normally a directory in load-path,
  ;; which means Emacs will be able to find FILE when it looks.
  ;; Any extra directory names here would prevent finding the file.
  (setq file (expand-file-name file))
  (file-relative-name file
		      (file-name-directory generated-autoload-file)))

(defun autoload-read-section-header ()
  "Read a section header form.
Since continuation lines have been marked as comments,
we must copy the text of the form and remove those comment
markers before we call `read'."
  (save-match-data
    (let ((beginning (point))
	  string)
      (forward-line 1)
      (while (looking-at generate-autoload-section-continuation)
	(forward-line 1))
      (setq string (buffer-substring beginning (point)))
      (with-current-buffer (get-buffer-create " *autoload*")
	(erase-buffer)
	(insert string)
	(goto-char (point-min))
	(while (search-forward generate-autoload-section-continuation nil t)
	  (replace-match " "))
	(goto-char (point-min))
	(read (current-buffer))))))

;; !! Requires OUTBUF to be bound !!
(defun autoload-print-form (form)
  "Print FORM such that make-docfile will find the docstrings."
  (cond
   ;; If the form is a sequence, recurse.
   ((eq (car form) 'progn) (mapcar 'autoload-print-form (cdr form)))
   ;; Symbols at the toplevel are meaningless.
   ((symbolp form) nil)
   (t
    (let ((doc-string-elt (get (car-safe form) 'doc-string-elt)))
      (if (and doc-string-elt (stringp (nth doc-string-elt form)))
	  ;; We need to hack the printing because the
	  ;; doc-string must be printed specially for
	  ;; make-docfile (sigh).
	  (let* ((p (nthcdr (1- doc-string-elt) form))
		 (elt (cdr p)))
	    (setcdr p nil)
	    (princ "\n(" outbuf)
	    (let ((print-escape-newlines t)
		  (print-escape-nonascii t))
	      (mapcar (lambda (elt)
			(prin1 elt outbuf)
			(princ " " outbuf))
		      form))
	    (princ "\"\\\n" outbuf)
	    (let ((begin (with-current-buffer outbuf (point))))
	      (princ (substring (prin1-to-string (car elt)) 1)
		     outbuf)
	      ;; Insert a backslash before each ( that
	      ;; appears at the beginning of a line in
	      ;; the doc string.
	      (with-current-buffer outbuf
		(save-excursion
		  (while (search-backward "\n(" begin t)
		    (forward-char 1)
		    (insert "\\"))))
	      (if (null (cdr elt))
		  (princ ")" outbuf)
		(princ " " outbuf)
		(princ (substring (prin1-to-string (cdr elt)) 1)
		       outbuf))
	      (terpri outbuf)))
	(let ((print-escape-newlines t)
	      (print-escape-nonascii t))
	  (print form outbuf)))))))

(defun autoload-ensure-default-file (file)
  "Make sure that the autoload file FILE exists and if not create it."
  (unless (file-exists-p file)
    (write-region
     (concat ";;; " (file-name-nondirectory file)
	     " --- automatically extracted autoloads\n"
	     ";;\n"
	     ";;; Code:\n\n"
	     "\n;; Local Variables:\n"
	     ";; version-control: never\n"
	     ";; no-byte-compile: t\n"
	     ";; no-update-autoloads: t\n"
	     ";; End:\n"
	     ";;; " (file-name-nondirectory file)
	     "ends here\n")
     nil file))
  file)

(defun autoload-insert-section-header (outbuf autoloads load-name file time)
  "Insert the section-header line,
which lists the file name and which functions are in it, etc."
  (insert generate-autoload-section-header)
  (prin1 (list 'autoloads autoloads load-name
	       (if (stringp file) (autoload-trim-file-name file) file)
	       time)
	 outbuf)
  (terpri outbuf)
  ;; Break that line at spaces, to avoid very long lines.
  ;; Make each sub-line into a comment.
  (with-current-buffer outbuf
    (save-excursion
      (forward-line -1)
      (while (not (eolp))
	(move-to-column 64)
	(skip-chars-forward "^ \n")
	(or (eolp)
	    (insert "\n" generate-autoload-section-continuation))))))

(defun generate-file-autoloads (file)
  "Insert at point a loaddefs autoload section for FILE.
autoloads are generated for defuns and defmacros in FILE
marked by `generate-autoload-cookie' (which see).
If FILE is being visited in a buffer, the contents of the buffer
are used."
  (interactive "fGenerate autoloads for file: ")
  (let ((outbuf (current-buffer))
	(autoloads-done '())
	(load-name (let ((name (file-name-nondirectory file)))
		     (if (string-match "\\.elc?$" name)
			 (substring name 0 (match-beginning 0))
		       name)))
	(print-length nil)
	(print-readably t)		; This does something in Lucid Emacs.
	(float-output-format nil)
	(done-any nil)
	(visited (get-file-buffer file))
	output-end)

    ;; If the autoload section we create here uses an absolute
    ;; pathname for FILE in its header, and then Emacs is installed
    ;; under a different path on another system,
    ;; `update-autoloads-here' won't be able to find the files to be
    ;; autoloaded.  So, if FILE is in the same directory or a
    ;; subdirectory of the current buffer's directory, we'll make it
    ;; relative to the current buffer's directory.
    (setq file (expand-file-name file))
    (let* ((source-truename (file-truename file))
	   (dir-truename (file-name-as-directory
			  (file-truename default-directory)))
	   (len (length dir-truename)))
      (if (and (< len (length source-truename))
	       (string= dir-truename (substring source-truename 0 len)))
	  (setq file (substring source-truename len))))

    (message "Generating autoloads for %s..." file)
    (save-excursion
      (unwind-protect
	  (progn
	    (if visited
		(set-buffer visited)
	      ;; It is faster to avoid visiting the file.
	      (set-buffer (get-buffer-create " *generate-autoload-file*"))
	      (kill-all-local-variables)
	      (erase-buffer)
	      (setq buffer-undo-list t
		    buffer-read-only nil)
	      (emacs-lisp-mode)
	      (insert-file-contents file nil))
	    (save-excursion
	      (save-restriction
		(widen)
		(goto-char (point-min))
		(while (not (eobp))
		  (skip-chars-forward " \t\n\f")
		  (cond
		   ((looking-at (regexp-quote generate-autoload-cookie))
		    (search-forward generate-autoload-cookie)
		    (skip-chars-forward " \t")
		    (setq done-any t)
		    (if (eolp)
			;; Read the next form and make an autoload.
			(let* ((form (prog1 (read (current-buffer))
					       (or (bolp) (forward-line 1))))
			       (autoload (make-autoload form load-name)))
			  (if autoload
			      (setq autoloads-done (cons (nth 1 form)
							 autoloads-done))
			    (setq autoload form))
			  (autoload-print-form autoload))
	 
		      ;; Copy the rest of the line to the output.
		      (princ (buffer-substring
			      (progn
				;; Back up over whitespace, to preserve it.
				(skip-chars-backward " \f\t")
				(if (= (char-after (1+ (point))) ? )
				    ;; Eat one space.
				    (forward-char 1))
				(point))
			      (progn (forward-line 1) (point)))
			     outbuf)))
		   ((looking-at ";")
		    ;; Don't read the comment.
		    (forward-line 1))
		   (t
		    (forward-sexp 1)
		    (forward-line 1)))))))
	(or visited
	    ;; We created this buffer, so we should kill it.
	    (kill-buffer (current-buffer)))
	(set-buffer outbuf)
	(setq output-end (point-marker))))
    (if done-any
	(progn
	  ;; Insert the section-header line
	  ;; which lists the file name and which functions are in it, etc.
	  (autoload-insert-section-header outbuf autoloads-done load-name file
					  (nth 5 (file-attributes file)))
	  (insert ";;; Generated autoloads from "
		  (autoload-trim-file-name file) "\n")
	  (goto-char output-end)
	  (insert generate-autoload-section-trailer)))
    (message "Generating autoloads for %s...done" file)))

;;;###autoload
(defun update-file-autoloads (file)
  "Update the autoloads for FILE in `generated-autoload-file'
\(which FILE might bind in its local variables).
Return FILE if there was no autoload cookie in it."
  (interactive "fUpdate autoloads for file: ")
  (let ((load-name (let ((name (file-name-nondirectory file)))
		     (if (string-match "\\.elc?$" name)
			 (substring name 0 (match-beginning 0))
		       name)))
	(found nil)
	(existing-buffer (get-file-buffer file))
	(no-autoloads nil))
    (save-excursion
      ;; We want to get a value for generated-autoload-file from
      ;; the local variables section if it's there.
      (if existing-buffer
	  (set-buffer existing-buffer))
      ;; We must read/write the file without any code conversion,
      ;; but still decode EOLs.
      (let ((coding-system-for-read 'raw-text))
	(set-buffer (find-file-noselect
		     (autoload-ensure-default-file
		      (expand-file-name generated-autoload-file
					(expand-file-name "lisp"
							  source-directory)))))
	;; This is to make generated-autoload-file have Unix EOLs, so
	;; that it is portable to all platforms.
	(setq buffer-file-coding-system 'raw-text-unix))
      (or (> (buffer-size) 0)
	  (error "Autoloads file %s does not exist" buffer-file-name))
      (or (file-writable-p buffer-file-name)
	  (error "Autoloads file %s is not writable" buffer-file-name))
      (save-excursion
	(save-restriction
	  (widen)
	  (goto-char (point-min))
	  ;; Look for the section for LOAD-NAME.
	  (while (and (not found)
		      (search-forward generate-autoload-section-header nil t))
	    (let ((form (autoload-read-section-header)))
	      (cond ((string= (nth 2 form) load-name)
		     ;; We found the section for this file.
		     ;; Check if it is up to date.
		     (let ((begin (match-beginning 0))
			   (last-time (nth 4 form))
			   (file-time (nth 5 (file-attributes file))))
		       (if (and (or (null existing-buffer)
				    (not (buffer-modified-p existing-buffer)))
				(listp last-time) (= (length last-time) 2)
				(not (autoload-before-p last-time file-time)))
			   (progn
			     (if (interactive-p)
				 (message "\
Autoload section for %s is up to date."
					  file))
			     (setq found 'up-to-date))
			 (search-forward generate-autoload-section-trailer)
			 (delete-region begin (point))
			 (setq found t))))
		    ((string< load-name (nth 2 form))
		     ;; We've come to a section alphabetically later than
		     ;; LOAD-NAME.  We assume the file is in order and so
		     ;; there must be no section for LOAD-NAME.  We will
		     ;; insert one before the section here.
		     (goto-char (match-beginning 0))
		     (setq found 'new)))))
	  (or found
	      (progn
		(setq found 'new)
		;; No later sections in the file.  Put before the last page.
		(goto-char (point-max))
		(search-backward "\f" nil t)))
	  (or (eq found 'up-to-date)
	      (and (eq found 'new)
		   ;; Check that FILE has any cookies before generating a
		   ;; new section for it.
		   (save-excursion
		     (if existing-buffer
			 (set-buffer existing-buffer)
		       ;; It is faster to avoid visiting the file.
		       (set-buffer (get-buffer-create " *autoload-file*"))
		       (kill-all-local-variables)
		       (erase-buffer)
		       (setq buffer-undo-list t
			     buffer-read-only nil)
		       (emacs-lisp-mode)
		       (insert-file-contents file nil))
		     (save-excursion
		       (save-restriction
			 (widen)
			 (goto-char (point-min))
			 (prog1
			     (if (re-search-forward
				  (concat "^" (regexp-quote
					       generate-autoload-cookie))
				  nil t)
				 nil
			       (if (interactive-p)
				   (message "%s has no autoloads" file))
			       (setq no-autoloads t)
			       t)
			   (or existing-buffer
			       (kill-buffer (current-buffer))))))))
	      (generate-file-autoloads file))))
      (and (interactive-p)
	   (buffer-modified-p)
	   (save-buffer))

      (if no-autoloads file))))

(defun autoload-before-p (time1 time2)
  (or (< (car time1) (car time2))
      (and (= (car time1) (car time2))
	   (< (nth 1 time1) (nth 1 time2)))))

(defun autoload-remove-section (begin)
  (goto-char begin)
  (search-forward generate-autoload-section-trailer)
  (delete-region begin (point)))

;;;###autoload
(defun update-autoloads-from-directories (&rest dirs)
  "\
Update loaddefs.el with all the current autoloads from DIRS, and no old ones.
This uses `update-file-autoloads' (which see) do its work."
  (interactive "DUpdate autoloads from directory: ")
  (let* ((files (apply 'nconc
		       (mapcar (lambda (dir)
				 (directory-files (expand-file-name dir)
						  ;; FIXME: add .gz etc...
						  t "^[^=.].*\\.el\\'"))
			       dirs)))
	 (this-time (current-time))
	 (no-autoloads nil)		;files with no autoload cookies.
	 (autoloads-file
	  (expand-file-name generated-autoload-file
			    (expand-file-name "lisp" source-directory)))
	 (top-dir (file-name-directory autoloads-file)))

    (with-current-buffer
	(find-file-noselect (autoload-ensure-default-file autoloads-file))
      (save-excursion

	;; Canonicalize file names and remove the autoload file itself.
	(setq files (delete (autoload-trim-file-name buffer-file-name)
			    (mapcar 'autoload-trim-file-name files)))

	(goto-char (point-min))
	(while (search-forward generate-autoload-section-header nil t)
	  (let* ((form (autoload-read-section-header))
		 (file (nth 3 form)))
	    (cond ((and (consp file) (stringp (car file)))
		   ;; This is a list of files that have no autoload cookies.
		   ;; There shouldn't be more than one such entry.
		   ;; Remove the obsolete section.
		   (autoload-remove-section (match-beginning 0))
		   (let ((last-time (nth 4 form)))
		     (dolist (file file)
		       (let ((file-time (nth 5 (file-attributes file))))
			 (when (and file-time
				    (not (autoload-before-p last-time
							    file-time)))
			   ;; file unchanged
			   (push file no-autoloads)
			   (setq files (delete file files)))))))
		  ((not (stringp file)))
		  ((not (file-exists-p (expand-file-name file top-dir)))
		   ;; Remove the obsolete section.
		   (autoload-remove-section (match-beginning 0)))
		  ((equal (nth 4 form) (nth 5 (file-attributes file)))
		   ;; File hasn't changed.
		   nil)
		  (t
		   (update-file-autoloads file)))
	    (setq files (delete file files)))))
      ;; Elements remaining in FILES have no existing autoload sections yet.
      (setq no-autoloads
	    (append no-autoloads
		    (delq nil (mapcar 'update-file-autoloads files))))
      (when no-autoloads
	;; Add the `no-autoloads' section.
	(goto-char (point-max))
	(search-backward "\f" nil t)
	(autoload-insert-section-header
	 (current-buffer) nil nil no-autoloads this-time)
	(insert generate-autoload-section-trailer))

      (save-buffer))))

;;;###autoload
(defun batch-update-autoloads ()
  "Update loaddefs.el autoloads in batch mode.
Calls `update-autoloads-from-directories' on the command line arguments."
  (apply 'update-autoloads-from-directories command-line-args-left)
  (setq command-line-args-left nil))

(provide 'autoload)

;;; autoload.el ends here