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

;;; Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
;;;
;; Author: Roland McGrath <roland@gnu.ai.mit.edu>
;; Keywords: maint

;;; This program 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.
;;;
;;; This program 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.
;;;
;;; A copy of the GNU General Public License can be obtained from this
;;; program's author (send electronic mail to roland@ai.mit.edu) or from
;;; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
;;; 02139, 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:

(defun make-autoload (form file)
  "Turn FORM, a defun or defmacro, into an autoload for source file FILE.
Returns nil if FORM is not a defun or defmacro."
  (let ((car (car-safe form)))
    (if (memq car '(defun defmacro))
	(let ((macrop (eq car 'defmacro))
	      name doc)
	  (setq form (cdr form))
	  (setq name (car form))
	  ;; Ignore the arguments.
	  (setq form (cdr (cdr form)))
	  (setq doc (car form))
	  (if (stringp doc)
	      (setq form (cdr form))
	    (setq doc nil))
	  (list 'autoload (list 'quote name) file doc
		(eq (car-safe (car form)) 'interactive)
		(if macrop (list 'quote 'macro) nil)))
      nil)))

(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 inserted before the form identifying
the section of autoloads for a file.")

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

;;; 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.
;;;
;;; There used to be the following note here:
;;; ;;; Note: defconst and defvar should NOT be marked in this way.
;;; ;;; We don't want to produce defconsts and defvars that
;;; ;;; make-docfile can grok, because then it would grok them twice,
;;; ;;; once in foo.el (where they are given with ;;;###autoload) and
;;; ;;; once in loaddefs.el.
;;;
;;; Counter-note: Yes, they should be marked in this way.
;;; make-docfile only processes those files that are loaded into the
;;; dumped Emacs, and those files should never have anything
;;; autoloaded here.  The above-feared problem only occurs with files
;;; which have autoloaded entries *and* are processed by make-docfile;
;;; there should be no such files.

(put 'autoload 'doc-string-elt 3)
(put 'defun    'doc-string-elt 3)
(put 'defvar   'doc-string-elt 3)
(put 'defconst 'doc-string-elt 3)
(put 'defmacro 'doc-string-elt 3)

(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 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
	    (set-buffer (find-file-noselect file))
	    (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))
			       (doc-string-elt (get (car-safe form)
						    'doc-string-elt)))
			  (if autoload
			      (setq autoloads-done (cons (nth 1 form)
							 autoloads-done))
			    (setq autoload form))
			  (if (and doc-string-elt
				   (stringp (nth doc-string-elt autoload)))
			      ;; 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)
						autoload))
				     (elt (cdr p)))
				(setcdr p nil)
				(princ "\n(" outbuf)
				(let ((print-escape-newlines t))
				  (mapcar (function (lambda (elt)
						      (prin1 elt outbuf)
						      (princ " " outbuf)))
					  autoload))
				(princ "\"\\\n" outbuf)
				(let ((begin (save-excursion
					       (set-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.
				  (save-excursion
				    (set-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 autoload outbuf))))
			  ;; Copy the rest of the line to the output.
			  (let ((begin (point)))
			    (forward-line 1)
			    (princ (buffer-substring begin (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 generate-autoload-section-header)
	  (prin1 (list 'autoloads autoloads-done load-name
		       (autoload-trim-file-name file)
		       (nth 5 (file-attributes file)))
		 outbuf)
	  (terpri outbuf)
	  (insert ";;; Generated autoloads from "
		  (autoload-trim-file-name file) "\n")
	  ;; Warn if we put a line in loaddefs.el
	  ;; that is long enough to cause trouble.
	  (while (< (point) output-end)
	    (let ((beg (point)))
	      (end-of-line)
	      (if (> (- (point) beg) 900)
		  (progn
		    (message "A line is too long--over 900 characters")
		    (sleep-for 2)
		    (goto-char output-end))))
	    (forward-line 1))
	  (goto-char output-end)
	  (insert generate-autoload-section-trailer)))
    (message "Generating autoloads for %s...done" file)))

(defconst 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.")

;;;###autoload
(defun update-file-autoloads (file)
  "Update the autoloads for FILE in `generated-autoload-file'
\(which FILE might bind in its local variables)."
  (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)))
    (save-excursion
      ;; We want to get a value for generated-autoload-file from
      ;; the local variables section if it's there.
      (set-buffer (find-file-noselect file))
      (set-buffer (find-file-noselect generated-autoload-file))
      (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 (condition-case ()
			    (read (current-buffer))
			  (end-of-file nil))))
	      (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)
				(or (> (car last-time) (car file-time))
				    (and (= (car last-time) (car file-time))
					 (>= (nth 1 last-time)
					     (nth 1 file-time)))))
			   (progn
			     (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 (eq found 'up-to-date)
	      (and (eq found 'new)
		   ;; Check that FILE has any cookies before generating a
		   ;; new section for it.
		   (save-excursion
		     (set-buffer (find-file-noselect file))
		     (save-excursion
		       (widen)
		       (goto-char (point-min))
		       (if (search-forward (concat "\n"
						   generate-autoload-cookie)
					   nil t)
			   nil
			 (if (interactive-p)
			     (message file " has no autoloads"))
			 t))))
	      (generate-file-autoloads file))))
      (if (interactive-p) (save-buffer))
      (if (and (null existing-buffer)
	       (setq existing-buffer (get-file-buffer file)))
	  (kill-buffer existing-buffer)))))

;;;###autoload
(defun update-autoloads-here ()
  "\
Update sections of the current buffer generated by \\[update-file-autoloads]."
  (interactive)
  (let ((generated-autoload-file (buffer-file-name)))
    (save-excursion
      (goto-char (point-min))
      (while (search-forward generate-autoload-section-header nil t)
	(let* ((form (condition-case ()
			 (read (current-buffer))
		       (end-of-file nil)))
	       (file (nth 3 form)))
	  (if (and (stringp file)
		   (or (get-file-buffer file)
		       (file-exists-p file)))
	      ()
	    (setq file (if (y-or-n-p (format "Can't find library `%s'; remove its autoloads? "
					     (nth 2 form) file))
			   t
			 (condition-case ()
			     (read-file-name (format "Find `%s' load file: "
						     (nth 2 form))
					     nil nil t)
			   (quit nil)))))
	  (if file
	      (let ((begin (match-beginning 0)))
		(search-forward generate-autoload-section-trailer)
		(delete-region begin (point))))
	  (if (stringp file)
	      (generate-file-autoloads file)))))))

;;;###autoload
(defun update-directory-autoloads (dir)
  "Run \\[update-file-autoloads] on each .el file in DIR."
  (interactive "DUpdate autoloads for directory: ")
  (let ((enable-local-eval nil))
    (mapcar 'update-file-autoloads
	    (directory-files dir t "^[^=].*\\.el$")))
  (if (interactive-p)
      (save-excursion
	(set-buffer (find-file-noselect generated-autoload-file))
	(save-buffer))))

;;;###autoload
(defun batch-update-autoloads ()
  "Update the autoloads for the files or directories on the command line.
Runs \\[update-file-autoloads] on files and \\[update-directory-autoloads]
on directories.  Must be used only with -batch, and kills Emacs on completion.
Each file will be processed even if an error occurred previously.
For example, invoke `emacs -batch -f batch-update-autoloads *.el'."
  (if (not noninteractive)
      (error "batch-update-autoloads is to be used only with -batch"))
  (let ((lost nil)
	(args command-line-args-left)
	(enable-local-eval nil))	;Don't query in batch mode.
    (message "Updating autoloads in %s..." generated-autoload-file)
    (let ((frob (function
 		 (lambda (file)
 		   (condition-case lossage
 		       (update-file-autoloads file)
 		     (error
 		      (princ ">>Error processing ")
 		      (princ file)
 		      (princ ": ")
 		      (if (fboundp 'display-error)
 			  (display-error lossage nil)
 			(prin1 lossage))
 		      (princ "\n")
 		      (setq lost t)))))))
      (while args
 	(if (file-directory-p (expand-file-name (car args)))
 	    (let ((rest (directory-files (car args) t "\\.el$")))
 	      (while rest
 		(funcall frob (car rest))
 		(setq rest (cdr rest))))
 	  (funcall frob (car args)))
 	(setq args (cdr args))))
    (save-some-buffers t)
    (message "Done")
    (kill-emacs (if lost 1 0))))

(provide 'autoload)

;;; autoload.el ends here
