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