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- ;;; executable.el --- base functionality for executable interpreter scripts
-
- ;; Copyright (C) 1994, 1995, 1996 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, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; 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'.")
-
-
- (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)
-
- (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-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)
- file)
- (while list
- (setq list (if (and (setq file (expand-file-name command (car list)))
- (file-executable-p file)
- (not (file-directory-p file)))
- nil
- (setq file nil)
- (cdr list))))
- file))
-
-
- (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
- 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
- (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-find interpreter)
- (error "Interpreter %s not recognized" 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 insert-flag executable-insert))
- (> (point-min) 1)
- (save-excursion
- (let ((point (point-marker))
- (buffer-modified-p (buffer-modified-p)))
- (goto-char (point-min))
- (make-local-hook 'after-save-hook)
- (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))))
- (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)))
- ;;; (or insert-flag
- ;;; (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
-