(generated-autoload-file): Change defconst to defvar.

[emacs.git] / lisp / emacs-lisp / autoload.el

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

;; Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.

;; Author: Roland McGrath <roland@gnu.ai.mit.edu>
;; 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:

(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, define-skeleton or defmacro."
  (let ((car (car-safe form)))
    (if (memq car '(defun define-skeleton defmacro))
        (let ((macrop (eq car 'defmacro))
              name doc)
          (setq form (cdr form)
                name (car form)
                ;; Ignore the arguments.
                form (cdr (if (eq car 'define-skeleton)
                              form
                            (cdr form)))
                doc (car form))
          (if (stringp doc)
              (setq form (cdr form))
            (setq doc nil))
          (list 'autoload (list 'quote name) file doc
                (or (eq car 'define-skeleton)
                    (eq (car-safe (car form)) 'interactive))
                (if macrop (list 'quote 'macro) nil)))
      nil)))

(put 'define-skeleton 'doc-string-elt 3)

(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
            (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))
                               (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.
                      (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 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)))
\f
(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.")

;;;###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.
      (if existing-buffer
          (set-buffer existing-buffer))
      ;; We must read/write the file without any code conversion.
      (let ((coding-system-for-read 'no-conversion))
        (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
                             (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 (search-forward
                                  (concat "\n" generate-autoload-cookie)
                                  nil t)
                                 nil
                               (if (interactive-p)
                                   (message "%s has no autoloads" file))
                               t)
                           (or existing-buffer
                               (kill-buffer (current-buffer))))))))
              (generate-file-autoloads file))))
      (if (interactive-p) (save-buffer)))))

;;;###autoload
(defun update-autoloads-from-directory (dir)
  "\
Update loaddefs.el with all the current autoloads from DIR, and no old ones.
This uses `update-file-autoloads' (which see) do its work."
  (interactive "DUpdate autoloads from directory: ")
  (setq dir (expand-file-name dir))
  (let ((files (directory-files dir t "^[^=].*\\.el$")))
    (save-excursion
      (set-buffer (find-file-noselect
                   (if (file-exists-p generated-autoload-file)
                       (expand-file-name generated-autoload-file)
                     (expand-file-name generated-autoload-file
                                       dir))))
      (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)))
            (cond ((not (stringp file)))
                  ((not (file-exists-p (expand-file-name file dir)))
                   ;; Remove the obsolete section.
                   (let ((begin (match-beginning 0)))
                     (search-forward generate-autoload-section-trailer)
                     (delete-region begin (point))))
                  (t
                   (update-file-autoloads file)))
            (setq files (delete file files)))))
      ;; Elements remaining in FILES have no existing autoload sections.
      (mapcar 'update-file-autoloads files)
      (save-buffer))))

;;;###autoload
(defun batch-update-autoloads ()
  "Update loaddefs.el autoloads in batch mode.
Calls `update-autoloads-from-directory' on each command line argument."
  (mapcar 'update-autoloads-from-directory command-line-args-left)
  (setq command-line-args-left nil))

(provide 'autoload)

;;; autoload.el ends here