--- /dev/null
+;;; executable.el --- base functionality for executable interpreter scripts
+;; Copyright (C) 1994, 1995 by Free Software Foundation, Inc.
+
+;; Author: Daniel.Pfeiffer@Informatik.START.dbp.de, fax (+49 69) 7588-2389
+;; Keywords: languages, unix
+
+;; 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, 675 Mass Ave, Cambridge, MA 02139, 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.
+
+;;; 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'.")
+
+
+(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.")
+
+
+(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.")
+
+
+(defvar executable-prefix "#! "
+ "*Interpreter magic number prefix inserted when there was no magic number.")
+
+
+
+(defvar 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).")
+
+
+(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"
+ "*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].")
+
+
+(defvar executable-font-lock-keywords
+ '(("\\`#!.*/\\([^ \t\n]+\\)" 1 font-lock-keyword-face t))
+ "*Rules for highlighting executable scripts' magic number.
+This can be included in `font-lock-keywords' by modes that call `executable'.")
+
+
+(defvar executable-error-regexp-alist
+ '(;; /bin/xyz: syntax error at line 14: `(' unexpected
+ ;; /bin/xyz[5]: syntax error at line 8 : ``' unmatched
+ ("^\\(.*[^[/]\\)\\(\\[[0-9]+\\]\\)?: .* error .* line \\([0-9]+\\)" 1 3)
+ ;; /bin/xyz[27]: ehco: not found
+ ("^\\(.*[^/]\\)\\[\\([0-9]+\\)\\]: .*: " 1 2)
+ ;; /bin/xyz: syntax error near unexpected token `)'
+ ;; /bin/xyz: /bin/xyz: line 2: `)'
+ ("^\\(.*[^/]\\): [^0-9\n]+\n\\1: \\1: line \\([0-9]+\\):" 1 2)
+ ;; /usr/bin/awk: syntax error at line 5 of file /bin/xyz
+ (" error .* line \\([0-9]+\\) of file \\(.+\\)$" 2 1)
+ ;; /usr/bin/awk: calling undefined function toto
+ ;; input record number 3, file awktestdata
+ ;; source line 4 of file /bin/xyz
+ ("^[^ ].+\n\\( .+\n\\)* line \\([0-9]+\\) of file \\(.+\\)$" 3 2)
+ ;; makefile:1: *** target pattern contains no `%'. Stop.
+ ("^\\(.+\\):\\([0-9]+\\): " 1 2))
+ "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."
+ (let ((list exec-path)
+ path)
+ (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))
+
+
+(defun executable-chmod ()
+ "This gets called after saving a file to assure that it be executable.
+You can set the absolute or relative mode in variable `executable-chmod' for
+non-executable files."
+ (and executable-chmod
+ buffer-file-name
+ (or (file-executable-p buffer-file-name)
+ (set-file-modes buffer-file-name
+ (if (< executable-chmod 0)
+ (- executable-chmod)
+ (logior executable-chmod
+ (file-modes buffer-file-name)))))))
+
+
+(defun executable-interpret (command)
+ "Run script with user-specified args, and collect output in a buffer.
+While script runs asynchronously, you can use the \\[next-error] command
+to find the next error."
+ (interactive (list (read-string "Run script: "
+ (or executable-command
+ buffer-file-name))))
+ (require 'compile)
+ (save-some-buffers (not compilation-ask-about-save))
+ (make-local-variable 'executable-command)
+ (compile-internal (setq executable-command command)
+ "No more errors." "Interpretation"
+ ;; Give it a simpler regexp to match.
+ nil executable-error-regexp-alist))
+
+
+
+;;;###autoload
+(defun executable-set-magic (interpreter &optional argument)
+ "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: ")
+ (setq interpreter (if (file-name-absolute-p interpreter)
+ interpreter
+ (or (executable interpreter)
+ (error "Cannot find %s." interpreter)))
+ argument (concat 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))
+ (> (point-min) 1)
+ (let ((point (point-marker))
+ (buffer-modified-p (buffer-modified-p)))
+ (goto-char (point-min))
+ (make-local-variable 'after-save-hook)
+ (add-hook 'after-save-hook 'executable-chmod)
+ (if (looking-at "#![ \t]*\\(.*\\)$")
+ (and (goto-char (match-beginning 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)
+
+
+
+;;;###autoload
+(defun executable-self-display ()
+ "Turn a text file into a self-displaying Un*x command.
+The magic number of such a command displays all lines but itself."
+ (interactive)
+ (if (eq this-command 'executable-self-display)
+ (setq this-command 'executable-set-magic))
+ (executable-set-magic executable-self-display "+2"))
+
+
+
+(provide 'executable)
+
+;; executable.el ends here
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