(defgroup executable nil
"Base functionality for executable interpreter scripts."
:group 'processes)
(defcustom executable-insert t "*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 'boolean
:group 'executable)
(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)
(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)
(defcustom executable-prefix "#! "
"*Interpreter magic number prefix inserted when there was no magic number."
:type 'string
:group 'executable)
(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)."
:type '(choice integer
(const nil))
:group 'executable)
(defvar executable-command nil)
(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]."
:type 'string
:group 'executable)
(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
'( ("^\\(.*[^[/]\\)\\(\\[[0-9]+\\]\\)?: .* error .* line \\([0-9]+\\)" 1 3)
("^\\(.*[^/]\\)\\[\\([0-9]+\\)\\]: .*: " 1 2)
("^\\(.*[^/]\\): [^0-9\n]+\n\\1: \\1: line \\([0-9]+\\):" 1 2)
(" error .* line \\([0-9]+\\) of file \\(.+\\)$" 2 1)
("^[^ ].+\n\\( .+\n\\)* line \\([0-9]+\\) of file \\(.+\\)$" 3 2)
("^\\(.+\\):\\([0-9]+\\): " 1 2))
"Alist of regexps used to match script errors.
See `compilation-error-regexp-alist'.")
(defvaralias 'executable-binary-suffixes 'exec-suffixes)
(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\"."
(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))))
(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. The buffer is also in `comint-mode' and
`compilation-shell-minor-mode', so that you can answer any prompts."
(interactive (list (read-string "Run script: "
(or executable-command
buffer-file-name))))
(require 'compile)
(save-some-buffers (not compilation-ask-about-save))
(set (make-local-variable 'executable-command) command)
(let ((compilation-error-regexp-alist executable-error-regexp-alist))
(compilation-start command t (lambda (x) "*interpretation*"))))
(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))))
(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 insert-flag executable-insert))
(> (point-min) 1)
(save-excursion
(goto-char (point-min))
(add-hook 'after-save-hook 'executable-chmod nil t)
(if (looking-at "#![ \t]*\\(.*\\)$")
(and (goto-char (match-beginning 1))
(not (= (char-after (1- (match-end 1))) ?\s))
(not (string= argument
(buffer-substring (point) (match-end 1))))
(if (or (not executable-query) no-query-flag
(save-window-excursion
(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)
(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"))
(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)