mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-06 08:54:05 +00:00
171 lines
6.4 KiB
EmacsLisp
171 lines
6.4 KiB
EmacsLisp
;;; resume.el --- process command line args from within a suspended Emacs job
|
|
|
|
;; Copyright (C) 1992 Free Software Foundation, Inc.
|
|
|
|
;; Author: Joe Wells <jbw@bucsf.bu.edu>
|
|
;; Adapted-By: ESR
|
|
;; Keywords: processes
|
|
|
|
;; 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 1, 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:
|
|
|
|
;; Theory: the first time you start Emacs, command line arguments are
|
|
;; handled normally. Then, you suspend your emacs job. When you want to edit
|
|
;; something else, you type "emacs filename" as usual, but instead of
|
|
;; starting a new emacs job, the old job is resumed instead, and the command
|
|
;; line arguments are placed in a file where the old emacs job looks for
|
|
;; them.
|
|
|
|
;; Stephan Gildea suggested bug fix (gildea@bbn.com).
|
|
;; Ideas from Michael DeCorte and other people.
|
|
|
|
;; For csh users, insert the following alias in your .cshrc file
|
|
;; (after removing the leading double semicolons, of course):
|
|
;;
|
|
;;# The following line could be just EMACS_CMD=emacs, but this depends on
|
|
;;# your site.
|
|
;;if (! $?EMACS_CMD) set EMACS_CMD=emacs
|
|
;;set JOBS_FILE=/tmp/jobs.$USER.$$
|
|
;;set ARGS_FILE=~/.emacs_args
|
|
;;set STOP_PATT='^\[[0-9]*\] *[ +-] Stopped ............ '
|
|
;;set SUNVIEW_CMD='emacstool -nw -f emacstool-init -f server-start'
|
|
;;set X_CMD=\'\''$EMACS_CMD -i -f server-start'
|
|
;;alias emacs \
|
|
;;' \\
|
|
;; jobs >! "$JOBS_FILE" \\
|
|
;; && grep "$STOP_PATT$EMACS_CMD" "$JOBS_FILE" >& /dev/null \\
|
|
;; && echo `pwd` \!* >! "$ARGS_FILE" && ""fg %$EMACS_CMD \\
|
|
;;|| if (! -e ~/.emacs_server || -f ~/.emacs_server) set status=1 \\
|
|
;; && emacsclient \!* \\
|
|
;;|| @ status=1 - $?DISPLAY && eval "$X_CMD -i \!* &" \\
|
|
;;|| @ status=1 - $?WINDOW_PARENT && eval "$SUNVIEW_CMD \!* &" \\
|
|
;;|| ""$EMACS_CMD -nw \!* \\
|
|
;;'
|
|
;;
|
|
;; The alias works as follows:
|
|
;; 1. If there is a suspended Emacs job that is a child of the
|
|
;; current shell, place its arguments in the ~/.emacs_args file and
|
|
;; resume it.
|
|
;; 2. Else if the ~/.emacs_server socket has been created, presume an
|
|
;; Emacs server is running and attempt to connect to it. If no Emacs
|
|
;; server is listening on the socket, this will fail.
|
|
;; 3. Else if the DISPLAY environment variable is set, presume we are
|
|
;; running under X Windows and start a new GNU Emacs process in the
|
|
;; background as an X client.
|
|
;; 4. Else if the WINDOW_PARENT environment variable is set, presume we
|
|
;; are running under SunView and start an emacstool process in the
|
|
;; background.
|
|
;; 5. Else start a regular Emacs process.
|
|
;;
|
|
;; Notes:
|
|
;; The output of the "jobs" command is not piped directly into "grep"
|
|
;; because that would run the "jobs" command in a subshell.
|
|
;; Before resuming a suspended emacs, the current directory and all
|
|
;; command line arguments are placed in a file name ~/.emacs_args.
|
|
;; The "-nw" switch to Emacs means no windowing system.
|
|
|
|
;; Insert this in your .emacs file:
|
|
;;(setq suspend-resume-hook 'resume-process-args)
|
|
;;(setq suspend-hook 'empty-args-file)
|
|
;;(autoload 'empty-args-file "resume")
|
|
;;(autoload 'resume-process-args "resume")
|
|
|
|
;; Finally, put the rest in a file named "resume.el" in a lisp library
|
|
;; directory.
|
|
|
|
;;; Code:
|
|
|
|
(defvar emacs-args-file (expand-file-name "~/.emacs_args")
|
|
"*This file is where arguments are placed for a suspended emacs job.")
|
|
|
|
(defvar emacs-args-buffer " *Command Line Args*"
|
|
"Buffer that is used by resume-process-args.")
|
|
|
|
(defun resume-process-args ()
|
|
"This should be called from inside of suspend-resume-hook. This
|
|
grabs the contents of the file whose name is stored in
|
|
emacs-args-file, and processes these arguments like command line
|
|
options."
|
|
(let ((start-buffer (current-buffer))
|
|
(args-buffer (get-buffer-create emacs-args-buffer))
|
|
length args)
|
|
(unwind-protect
|
|
(progn
|
|
(set-buffer args-buffer)
|
|
(erase-buffer)
|
|
;; get the contents of emacs-args-file
|
|
(condition-case ()
|
|
(let ((result (insert-file-contents emacs-args-file)))
|
|
(setq length (car (cdr result))))
|
|
;; the file doesn't exist, ergo no arguments
|
|
(file-error
|
|
(erase-buffer)
|
|
(setq length 0)))
|
|
(if (<= length 0)
|
|
(setq args nil)
|
|
;; get the arguments from the buffer
|
|
(goto-char (point-min))
|
|
(while (not (eobp))
|
|
(skip-chars-forward " \t\n")
|
|
(let ((begin (point)))
|
|
(skip-chars-forward "^ \t\n")
|
|
(setq args (cons (buffer-substring begin (point)) args)))
|
|
(skip-chars-forward " \t\n"))
|
|
;; arguments are now in reverse order
|
|
(setq args (nreverse args))
|
|
;; make sure they're not read again
|
|
(erase-buffer))
|
|
(write-buffer-to-file (current-buffer) emacs-args-file)
|
|
;; if nothing was in buffer, args will be null
|
|
(or (null args)
|
|
(setq default-directory (file-name-as-directory (car args))
|
|
args (cdr args)))
|
|
;; actually process the arguments
|
|
(command-line-1 args))
|
|
;; If the command line args don't result in a find-file, the
|
|
;; buffer will be left in args-buffer. So we change back to the
|
|
;; original buffer. The reason I don't just use
|
|
;; (let ((default-directory foo))
|
|
;; (command-line-1 args))
|
|
;; in the context of the original buffer is because let does not
|
|
;; work properly with buffer-local variables.
|
|
(if (eq (current-buffer) args-buffer)
|
|
(set-buffer start-buffer)))))
|
|
|
|
(defun empty-args-file ()
|
|
"This empties the contents of the file whose name is specified by
|
|
emacs-args-file."
|
|
(save-excursion
|
|
(set-buffer (get-buffer-create emacs-args-buffer))
|
|
(erase-buffer)
|
|
(write-buffer-to-file (current-buffer) emacs-args-file)))
|
|
|
|
(defun write-buffer-to-file (buffer file)
|
|
"Writes the contents of BUFFER into FILE, if permissions allow."
|
|
(if (not (file-writable-p file))
|
|
(error "No permission to write file %s" file))
|
|
(save-excursion
|
|
(set-buffer buffer)
|
|
(clear-visited-file-modtime)
|
|
(save-restriction
|
|
(widen)
|
|
(write-region (point-min) (point-max) file nil 'quiet))
|
|
(set-buffer-modified-p nil)))
|
|
|
|
;;; resume.el ends here
|