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Karl Heuer
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217
lisp/progmodes/executable.el
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lisp/progmodes/executable.el
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;;; executable.el --- base functionality for executable interpreter scripts
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;; Copyright (C) 1994, 1995 by Free Software Foundation, Inc.
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;; Author: Daniel.Pfeiffer@Informatik.START.dbp.de, fax (+49 69) 7588-2389
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;; Keywords: languages, unix
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; Provide or modify interpreter magic number for buffer, and make file
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;; executable if it isn't. Support code for the likes of sh-, awk-, perl-,
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;; tcl- or makefile-mode.
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;;; Code:
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(defvar executable-insert 'not-modified
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"*What to do when newly found file has no or wrong magic number:
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nil do nothing
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t insert or update magic number
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other insert or update magic number, but mark as unmodified.
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When the insertion is marked as unmodified, you can save it with \\[write-file] RET.
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This variable is used when `executable-set-magic' is called as a function,
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e.g. when Emacs sets some Un*x interpreter script mode.
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With \\[executable-set-magic], this is always treated as if it were `t'.")
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(defvar executable-query 'function
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"*If non-`nil', ask user before inserting or changing magic number.
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When this is `function', only ask when called non-interactively.")
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(defvar executable-magicless-file-regexp "/[Mm]akefile$\\|/\\.\\(z?profile\\|bash_profile\\|z?login\\|bash_login\\|z?logout\\|bash_logout\\|.+shrc\\|esrc\\|rcrc\\|[kz]shenv\\)$"
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"*On files with this kind of name no magic is inserted or changed.")
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(defvar executable-prefix "#! "
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"*Interpreter magic number prefix inserted when there was no magic number.")
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(defvar executable-chmod 73
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"*After saving, if the file is not executable, set this mode.
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This mode passed to `set-file-modes' is taken absolutely when negative, or
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relative to the files existing modes. Do nothing if this is nil.
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Typical values are 73 (+x) or -493 (rwxr-xr-x).")
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(defvar executable-command nil)
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;;;###autoload
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(or (assoc "tail" interpreter-mode-alist)
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(nconc interpreter-mode-alist
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'(("tail" . text-mode)
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("more" . text-mode)
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("less" . text-mode)
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("pg" . text-mode))))
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(defvar executable-self-display "tail"
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"*Command you use with argument `+2' to make text files self-display.
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Note that the like of `more' doesn't work too well under Emacs \\[shell].")
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(defvar executable-font-lock-keywords
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'(("\\`#!.*/\\([^ \t\n]+\\)" 1 font-lock-keyword-face t))
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"*Rules for highlighting executable scripts' magic number.
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This can be included in `font-lock-keywords' by modes that call `executable'.")
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(defvar executable-error-regexp-alist
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'(;; /bin/xyz: syntax error at line 14: `(' unexpected
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;; /bin/xyz[5]: syntax error at line 8 : ``' unmatched
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("^\\(.*[^[/]\\)\\(\\[[0-9]+\\]\\)?: .* error .* line \\([0-9]+\\)" 1 3)
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;; /bin/xyz[27]: ehco: not found
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("^\\(.*[^/]\\)\\[\\([0-9]+\\)\\]: .*: " 1 2)
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;; /bin/xyz: syntax error near unexpected token `)'
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;; /bin/xyz: /bin/xyz: line 2: `)'
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("^\\(.*[^/]\\): [^0-9\n]+\n\\1: \\1: line \\([0-9]+\\):" 1 2)
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;; /usr/bin/awk: syntax error at line 5 of file /bin/xyz
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(" error .* line \\([0-9]+\\) of file \\(.+\\)$" 2 1)
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;; /usr/bin/awk: calling undefined function toto
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;; input record number 3, file awktestdata
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;; source line 4 of file /bin/xyz
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("^[^ ].+\n\\( .+\n\\)* line \\([0-9]+\\) of file \\(.+\\)$" 3 2)
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;; makefile:1: *** target pattern contains no `%'. Stop.
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("^\\(.+\\):\\([0-9]+\\): " 1 2))
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"Alist of regexps used to match script errors.
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See `compilation-error-regexp-alist'.")
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;; The C function openp() slightly modified would do the trick fine
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(defun executable (command)
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"If COMMAND is an executable in $PATH its full name is returned. Else nil."
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(let ((list exec-path)
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path)
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(while list
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(setq list (if (and (setq path (expand-file-name command (car list)))
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(file-executable-p path)
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(not (file-directory-p path)))
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nil
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(setq path nil)
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(cdr list))))
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path))
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(defun executable-chmod ()
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"This gets called after saving a file to assure that it be executable.
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You can set the absolute or relative mode in variable `executable-chmod' for
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non-executable files."
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(and executable-chmod
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buffer-file-name
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(or (file-executable-p buffer-file-name)
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(set-file-modes buffer-file-name
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(if (< executable-chmod 0)
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(- executable-chmod)
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(logior executable-chmod
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(file-modes buffer-file-name)))))))
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(defun executable-interpret (command)
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"Run script with user-specified args, and collect output in a buffer.
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While script runs asynchronously, you can use the \\[next-error] command
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to find the next error."
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(interactive (list (read-string "Run script: "
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(or executable-command
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buffer-file-name))))
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(require 'compile)
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(save-some-buffers (not compilation-ask-about-save))
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(make-local-variable 'executable-command)
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(compile-internal (setq executable-command command)
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"No more errors." "Interpretation"
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;; Give it a simpler regexp to match.
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nil executable-error-regexp-alist))
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;;;###autoload
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(defun executable-set-magic (interpreter &optional argument)
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"Set this buffer's interpreter to INTERPRETER with optional ARGUMENT.
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The variables `executable-magicless-file-regexp', `executable-prefix',
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`executable-insert', `executable-query' and `executable-chmod' control
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when and how magic numbers are inserted or replaced and scripts made
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executable."
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(interactive "sName or path of interpreter: \nsArgument for %s: ")
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(setq interpreter (if (file-name-absolute-p interpreter)
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interpreter
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(or (executable interpreter)
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(error "Cannot find %s." interpreter)))
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argument (concat interpreter
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(and argument (string< "" argument) " ")
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argument))
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(or buffer-read-only
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(if buffer-file-name
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(string-match executable-magicless-file-regexp
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buffer-file-name))
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(not (or (eq this-command 'executable-set-magic)
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executable-insert))
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(> (point-min) 1)
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(let ((point (point-marker))
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(buffer-modified-p (buffer-modified-p)))
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(goto-char (point-min))
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(make-local-variable 'after-save-hook)
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(add-hook 'after-save-hook 'executable-chmod)
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(if (looking-at "#![ \t]*\\(.*\\)$")
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(and (goto-char (match-beginning 1))
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(not (string= argument
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(buffer-substring (point) (match-end 1))))
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(save-window-excursion
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;; make buffer visible before question or message
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(switch-to-buffer (current-buffer))
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(if (or (not executable-query)
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(and (eq executable-query 'function)
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(eq this-command 'executable-set-magic)))
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(message "%s Magic number ``%s'' replaced." this-command
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(buffer-substring (point-min) (match-end 1)))
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(y-or-n-p (concat "Replace magic number by ``"
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executable-prefix argument "''? "))))
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(not (delete-region (point) (match-end 1)))
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(insert argument))
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(insert executable-prefix argument ?\n))
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(or (< (marker-position point) (point))
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(goto-char point))
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(or (eq this-command 'executable-set-magic))
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(eq executable-insert t)
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(set-buffer-modified-p buffer-modified-p)))
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interpreter)
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;;;###autoload
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(defun executable-self-display ()
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"Turn a text file into a self-displaying Un*x command.
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The magic number of such a command displays all lines but itself."
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(interactive)
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(if (eq this-command 'executable-self-display)
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(setq this-command 'executable-set-magic))
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(executable-set-magic executable-self-display "+2"))
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(provide 'executable)
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;; executable.el ends here
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