-;;; executable.el --- base functionality for executable interpreter scripts
-;; Copyright (C) 1994, 1995 by Free Software Foundation, Inc.
+;;; executable.el --- base functionality for executable interpreter scripts -*- byte-compile-dynamic: t -*-
-;; Author: Daniel.Pfeiffer@Informatik.START.dbp.de, fax (+49 69) 7588-2389
+;; Copyright (C) 1994, 1995, 1996, 2000, 2003, 2004 by Free Software Foundation, Inc.
+
+;; Author: Daniel Pfeiffer <occitan@esperanto.org>
;; Keywords: languages, unix
;; This file is part of GNU Emacs.
;; 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.
+;; 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:
-;; Provide or modify interpreter magic number for buffer, and make file
-;; executable if it isn't. Support code for the likes of sh-, awk-, perl-,
-;; tcl- or makefile-mode.
+;; executable.el is used by certain major modes to insert a suitable
+;; #! line at the beginning of the file, if the file does not already
+;; have one.
+
+;; Unless it has a magic number, a Unix file with executable mode is passed to
+;; a new instance of the running shell (or to a Bourne shell if a csh is
+;; running and the file starts with `:'). Only a shell can start such a file,
+;; exec() cannot, which is why it is important to have a magic number in every
+;; executable script. Such a magic number is made up by the characters `#!'
+;; the filename of an interpreter (in COFF, ELF or somesuch format) and one
+;; optional argument.
+
+;; This library is for certain major modes like sh-, awk-, perl-, tcl- or
+;; makefile-mode to insert or update a suitable #! line at the beginning of
+;; the file, if the file does not already have one and the file is not a
+;; default file of that interpreter (like .profile or makefile). It also
+;; makes the file executable if it wasn't, as soon as it's saved.
+
+;; It also allows debugging scripts, with an adaptation of compile, as far
+;; as interpreters give out meaningful error messages.
+
+;; Modes that use this should nconc `executable-map' to the end of their own
+;; keymap and `executable-font-lock-keywords' to the end of their own font
+;; lock keywords. Their mode-setting commands should call
+;; `executable-set-magic'.
;;; Code:
-(defvar executable-insert 'not-modified
- "*What to do when newly found file has no or wrong magic number:
- nil do nothing
- t insert or update magic number
- other insert or update magic number, but mark as unmodified.
-When the insertion is marked as unmodified, you can save it with \\[write-file] RET.
-This variable is used when `executable-set-magic' is called as a function,
-e.g. when Emacs sets some Un*x interpreter script mode.
-With \\[executable-set-magic], this is always treated as if it were `t'.")
+(defgroup executable nil
+ "Base functionality for executable interpreter scripts"
+ :group 'processes)
+;; This used to default to `other', but that doesn't seem to have any
+;; significance. fx 2000-02-11.
+(defcustom executable-insert t ; 'other
+ "*Non-nil means offer to add a magic number to a file.
+This takes effect when you switch to certain major modes,
+including Shell-script mode (`sh-mode').
+When you type \\[executable-set-magic], it always offers to add or
+update the magic number."
+;;; :type '(choice (const :tag "off" nil)
+;;; (const :tag "on" t)
+;;; symbol)
+ :type 'boolean
+ :group 'executable)
-(defvar executable-query 'function
- "*If non-`nil', ask user before inserting or changing magic number.
-When this is `function', only ask when called non-interactively.")
+(defcustom executable-query 'function
+ "*If non-nil, ask user before changing an existing magic number.
+When this is `function', only ask when called non-interactively."
+ :type '(choice (const :tag "Don't Ask" nil)
+ (const :tag "Ask when non-interactive" function)
+ (other :tag "Ask" t))
+ :group 'executable)
-(defvar executable-magicless-file-regexp "/[Mm]akefile$\\|/\\.\\(z?profile\\|bash_profile\\|z?login\\|bash_login\\|z?logout\\|bash_logout\\|.+shrc\\|esrc\\|rcrc\\|[kz]shenv\\)$"
- "*On files with this kind of name no magic is inserted or changed.")
+(defcustom executable-magicless-file-regexp "/[Mm]akefile$\\|/\\.\\(z?profile\\|bash_profile\\|z?login\\|bash_login\\|z?logout\\|bash_logout\\|.+shrc\\|esrc\\|rcrc\\|[kz]shenv\\)$"
+ "*On files with this kind of name no magic is inserted or changed."
+ :type 'regexp
+ :group 'executable)
-(defvar executable-prefix "#! "
- "*Interpreter magic number prefix inserted when there was no magic number.")
+(defcustom executable-prefix "#! "
+ "*Interpreter magic number prefix inserted when there was no magic number."
+ :type 'string
+ :group 'executable)
-(defvar executable-chmod 73
+(defcustom executable-chmod 73
"*After saving, if the file is not executable, set this mode.
This mode passed to `set-file-modes' is taken absolutely when negative, or
relative to the files existing modes. Do nothing if this is nil.
-Typical values are 73 (+x) or -493 (rwxr-xr-x).")
+Typical values are 73 (+x) or -493 (rwxr-xr-x)."
+ :type '(choice integer
+ (const nil))
+ :group 'executable)
(defvar executable-command nil)
-
-;;;###autoload
-(or (assoc "tail" interpreter-mode-alist)
- (nconc interpreter-mode-alist
- '(("tail" . text-mode)
- ("more" . text-mode)
- ("less" . text-mode)
- ("pg" . text-mode))))
-
-(defvar executable-self-display "tail"
+(defcustom executable-self-display "tail"
"*Command you use with argument `+2' to make text files self-display.
-Note that the like of `more' doesn't work too well under Emacs \\[shell].")
+Note that the like of `more' doesn't work too well under Emacs \\[shell]."
+ :type 'string
+ :group 'executable)
(defvar executable-font-lock-keywords
"Alist of regexps used to match script errors.
See `compilation-error-regexp-alist'.")
-;; The C function openp() slightly modified would do the trick fine
-(defun executable (command)
- "If COMMAND is an executable in $PATH its full name is returned. Else nil."
+;; The C function openp slightly modified would do the trick fine
+(defvaralias 'executable-binary-suffixes 'exec-suffixes)
+
+;;;###autoload
+(defun executable-command-find-posix-p (&optional program)
+ "Check if PROGRAM handles arguments Posix-style.
+If PROGRAM is non-nil, use that instead of \"find\"."
+ ;; Pick file to search from location we know
+ (let* ((dir (file-truename data-directory))
+ (file (car (directory-files dir nil "^[^.]"))))
+ (with-temp-buffer
+ (call-process (or program "find")
+ nil
+ (current-buffer)
+ nil
+ dir
+ "-name"
+ file
+ "-maxdepth"
+ "1")
+ (goto-char (point-min))
+ (if (search-forward file nil t)
+ t))))
+
+;;;###autoload
+(defun executable-find (command)
+ "Search for COMMAND in `exec-path' and return the absolute file name.
+Return nil if COMMAND is not found anywhere in `exec-path'."
(let ((list exec-path)
- path)
+ file)
(while list
- (setq list (if (and (setq path (expand-file-name command (car list)))
- (file-executable-p path)
- (not (file-directory-p path)))
- nil
- (setq path nil)
- (cdr list))))
- path))
-
+ (setq list
+ (if (and (setq file (expand-file-name command (car list)))
+ (let ((suffixes exec-suffixes)
+ candidate)
+ (while suffixes
+ (setq candidate (concat file (car suffixes)))
+ (if (and (file-executable-p candidate)
+ (not (file-directory-p candidate)))
+ (setq suffixes nil)
+ (setq suffixes (cdr suffixes))
+ (setq candidate nil)))
+ (setq file candidate)))
+ nil
+ (setq file nil)
+ (cdr list))))
+ file))
(defun executable-chmod ()
"This gets called after saving a file to assure that it be executable.
;;;###autoload
-(defun executable-set-magic (interpreter &optional argument)
+(defun executable-set-magic (interpreter &optional argument
+ no-query-flag insert-flag)
"Set this buffer's interpreter to INTERPRETER with optional ARGUMENT.
The variables `executable-magicless-file-regexp', `executable-prefix',
`executable-insert', `executable-query' and `executable-chmod' control
when and how magic numbers are inserted or replaced and scripts made
executable."
- (interactive "sName or path of interpreter: \nsArgument for %s: ")
+ (interactive
+ (let* ((name (read-string "Name or file name of interpreter: "))
+ (arg (read-string (format "Argument for %s: " name))))
+ (list name arg (eq executable-query 'function) t)))
+
(setq interpreter (if (file-name-absolute-p interpreter)
interpreter
- (or (executable interpreter)
- (error "Cannot find %s." interpreter)))
- argument (concat interpreter
+ (or (executable-find interpreter)
+ (error "Interpreter %s not recognized"
+ interpreter))))
+
+ (setq argument (concat (if (string-match "\\`/:" interpreter)
+ (replace-match "" nil nil interpreter)
+ interpreter)
(and argument (string< "" argument) " ")
argument))
+
(or buffer-read-only
(if buffer-file-name
(string-match executable-magicless-file-regexp
buffer-file-name))
- (not (or (eq this-command 'executable-set-magic)
- executable-insert))
+ (not (or insert-flag executable-insert))
(> (point-min) 1)
- (let ((point (point-marker))
- (buffer-modified-p (buffer-modified-p)))
+ (save-excursion
(goto-char (point-min))
- (make-local-variable 'after-save-hook)
- (add-hook 'after-save-hook 'executable-chmod)
+ (add-hook 'after-save-hook 'executable-chmod nil t)
(if (looking-at "#![ \t]*\\(.*\\)$")
(and (goto-char (match-beginning 1))
+ ;; If the line ends in a space,
+ ;; don't offer to change it.
+ (not (= (char-after (1- (match-end 1))) ?\ ))
(not (string= argument
(buffer-substring (point) (match-end 1))))
- (save-window-excursion
- ;; make buffer visible before question or message
- (switch-to-buffer (current-buffer))
- (if (or (not executable-query)
- (and (eq executable-query 'function)
- (eq this-command 'executable-set-magic)))
- (message "%s Magic number ``%s'' replaced." this-command
- (buffer-substring (point-min) (match-end 1)))
- (y-or-n-p (concat "Replace magic number by ``"
- executable-prefix argument "''? "))))
- (not (delete-region (point) (match-end 1)))
- (insert argument))
- (insert executable-prefix argument ?\n))
- (or (< (marker-position point) (point))
- (goto-char point))
- (or (eq this-command 'executable-set-magic))
- (eq executable-insert t)
- (set-buffer-modified-p buffer-modified-p)))
- interpreter)
+ (if (or (not executable-query) no-query-flag
+ (save-window-excursion
+ ;; Make buffer visible before question.
+ (switch-to-buffer (current-buffer))
+ (y-or-n-p (concat "Replace magic number by `"
+ executable-prefix argument "'? "))))
+ (progn
+ (replace-match argument t t nil 1)
+ (message "Magic number changed to `%s'"
+ (concat executable-prefix argument)))))
+ (insert executable-prefix argument ?\n)
+ (message "Magic number changed to `%s'"
+ (concat executable-prefix argument)))))
+ interpreter)
(setq this-command 'executable-set-magic))
(executable-set-magic executable-self-display "+2"))
-
+;;;###autoload
+(defun executable-make-buffer-file-executable-if-script-p ()
+ "Make file executable according to umask if not already executable.
+If file already has any execute bits set at all, do not change existing
+file modes."
+ (and (>= (buffer-size) 2)
+ (save-restriction
+ (widen)
+ (string= "#!" (buffer-substring (point-min) (+ 2 (point-min)))))
+ (let* ((current-mode (file-modes (buffer-file-name)))
+ (add-mode (logand ?\111 (default-file-modes))))
+ (or (/= (logand ?\111 current-mode) 0)
+ (zerop add-mode)
+ (set-file-modes (buffer-file-name)
+ (logior current-mode add-mode))))))
(provide 'executable)
-;; executable.el ends here
+;;; arch-tag: 58458d1c-d9db-45ec-942b-8bbb1d5e319d
+;;; executable.el ends here