Commit 58a4ff04 authored by Karl Heuer's avatar Karl Heuer
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Initial revision

parent 3f61a2e7
;;; 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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