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c88ab9ce ER |
1 | ;;; resume.el --- process command line args from within a suspended Emacs job |
2 | ||
9750e079 ER |
3 | ;; Copyright (C) 1992 Free Software Foundation, Inc. |
4 | ||
f961a17c | 5 | ;; Author: Joe Wells <jbw@bucsf.bu.edu> |
f961a17c | 6 | ;; Adapted-By: ESR |
d7b4d18f | 7 | ;; Keywords: processes |
f961a17c | 8 | |
f961a17c ER |
9 | ;; This file is part of GNU Emacs. |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 1, or (at your option) | |
14 | ;; any later version. | |
dc556c64 | 15 | |
dc556c64 | 16 | ;; GNU Emacs is distributed in the hope that it will be useful, |
f961a17c ER |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
23 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; Theory: the first time you start Emacs, command line arguments are | |
28 | ;; handled normally. Then, you suspend your emacs job. When you want to edit | |
29 | ;; something else, you type "emacs filename" as usual, but instead of | |
30 | ;; starting a new emacs job, the old job is resumed instead, and the command | |
31 | ;; line arguments are placed in a file where the old emacs job looks for | |
32 | ;; them. | |
33 | ||
34 | ;; Stephan Gildea suggested bug fix (gildea@bbn.com). | |
dc556c64 RS |
35 | ;; Ideas from Michael DeCorte and other people. |
36 | ||
37 | ;; For csh users, insert the following alias in your .cshrc file | |
d543cc8e | 38 | ;; (after removing the leading double semicolons, of course): |
dc556c64 | 39 | ;; |
d543cc8e | 40 | ;;# The following line could be just EMACS_CMD=emacs, but this depends on |
dc556c64 | 41 | ;;# your site. |
d543cc8e RS |
42 | ;;if (! $?EMACS_CMD) set EMACS_CMD=emacs |
43 | ;;set JOBS_FILE=/tmp/jobs.$USER.$$ | |
44 | ;;set ARGS_FILE=~/.emacs_args | |
45 | ;;set STOP_PATT='^\[[0-9]*\] *[ +-] Stopped ............ ' | |
46 | ;;set SUNVIEW_CMD='emacstool -nw -f emacstool-init -f server-start' | |
47 | ;;set X_CMD=\'\''$EMACS_CMD -i -f server-start' | |
dc556c64 RS |
48 | ;;alias emacs \ |
49 | ;;' \\ | |
d543cc8e RS |
50 | ;; jobs >! "$JOBS_FILE" \\ |
51 | ;; && grep "$STOP_PATT$EMACS_CMD" "$JOBS_FILE" >& /dev/null \\ | |
52 | ;; && echo `pwd` \!* >! "$ARGS_FILE" && ""fg %$EMACS_CMD \\ | |
53 | ;;|| if (! -e ~/.emacs_server || -f ~/.emacs_server) set status=1 \\ | |
54 | ;; && emacsclient \!* \\ | |
55 | ;;|| @ status=1 - $?DISPLAY && eval "$X_CMD -i \!* &" \\ | |
56 | ;;|| @ status=1 - $?WINDOW_PARENT && eval "$SUNVIEW_CMD \!* &" \\ | |
57 | ;;|| ""$EMACS_CMD -nw \!* \\ | |
58 | ;;' | |
dc556c64 RS |
59 | ;; |
60 | ;; The alias works as follows: | |
d543cc8e | 61 | ;; 1. If there is a suspended Emacs job that is a child of the |
dc556c64 RS |
62 | ;; current shell, place its arguments in the ~/.emacs_args file and |
63 | ;; resume it. | |
64 | ;; 2. Else if the ~/.emacs_server socket has been created, presume an | |
d543cc8e | 65 | ;; Emacs server is running and attempt to connect to it. If no Emacs |
dc556c64 RS |
66 | ;; server is listening on the socket, this will fail. |
67 | ;; 3. Else if the DISPLAY environment variable is set, presume we are | |
d543cc8e RS |
68 | ;; running under X Windows and start a new GNU Emacs process in the |
69 | ;; background as an X client. | |
dc556c64 | 70 | ;; 4. Else if the WINDOW_PARENT environment variable is set, presume we |
d543cc8e RS |
71 | ;; are running under SunView and start an emacstool process in the |
72 | ;; background. | |
73 | ;; 5. Else start a regular Emacs process. | |
dc556c64 RS |
74 | ;; |
75 | ;; Notes: | |
dc556c64 RS |
76 | ;; The output of the "jobs" command is not piped directly into "grep" |
77 | ;; because that would run the "jobs" command in a subshell. | |
78 | ;; Before resuming a suspended emacs, the current directory and all | |
d543cc8e RS |
79 | ;; command line arguments are placed in a file name ~/.emacs_args. |
80 | ;; The "-nw" switch to Emacs means no windowing system. | |
dc556c64 | 81 | |
d543cc8e | 82 | ;; Insert this in your .emacs file: |
30c9c6d7 | 83 | ;;(add-hook 'suspend-hook 'resume-suspend-hook) |
d543cc8e RS |
84 | |
85 | ;; Finally, put the rest in a file named "resume.el" in a lisp library | |
86 | ;; directory. | |
87 | ||
f961a17c ER |
88 | ;;; Code: |
89 | ||
078380ac | 90 | (defvar resume-emacs-args-file (expand-file-name "~/.emacs_args") |
dc556c64 RS |
91 | "*This file is where arguments are placed for a suspended emacs job.") |
92 | ||
078380ac | 93 | (defvar resume-emacs-args-buffer " *Command Line Args*" |
d543cc8e | 94 | "Buffer that is used by resume-process-args.") |
dc556c64 RS |
95 | |
96 | (defun resume-process-args () | |
078380ac | 97 | "Handler for command line args given when Emacs is resumed." |
d543cc8e | 98 | (let ((start-buffer (current-buffer)) |
078380ac | 99 | (args-buffer (get-buffer-create resume-emacs-args-buffer)) |
5d2e242c KH |
100 | length args |
101 | (command-line-default-directory default-directory)) | |
dc556c64 RS |
102 | (unwind-protect |
103 | (progn | |
d543cc8e | 104 | (set-buffer args-buffer) |
dc556c64 | 105 | (erase-buffer) |
078380ac | 106 | ;; get the contents of resume-emacs-args-file |
dc556c64 | 107 | (condition-case () |
078380ac | 108 | (let ((result (insert-file-contents resume-emacs-args-file))) |
d543cc8e RS |
109 | (setq length (car (cdr result)))) |
110 | ;; the file doesn't exist, ergo no arguments | |
111 | (file-error | |
112 | (erase-buffer) | |
113 | (setq length 0))) | |
114 | (if (<= length 0) | |
115 | (setq args nil) | |
116 | ;; get the arguments from the buffer | |
117 | (goto-char (point-min)) | |
118 | (while (not (eobp)) | |
119 | (skip-chars-forward " \t\n") | |
120 | (let ((begin (point))) | |
121 | (skip-chars-forward "^ \t\n") | |
122 | (setq args (cons (buffer-substring begin (point)) args))) | |
123 | (skip-chars-forward " \t\n")) | |
124 | ;; arguments are now in reverse order | |
125 | (setq args (nreverse args)) | |
126 | ;; make sure they're not read again | |
127 | (erase-buffer)) | |
078380ac | 128 | (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file) |
d543cc8e RS |
129 | ;; if nothing was in buffer, args will be null |
130 | (or (null args) | |
5d2e242c KH |
131 | (setq command-line-default-directory |
132 | (file-name-as-directory (car args)) | |
d543cc8e RS |
133 | args (cdr args))) |
134 | ;; actually process the arguments | |
135 | (command-line-1 args)) | |
dc556c64 | 136 | ;; If the command line args don't result in a find-file, the |
d543cc8e | 137 | ;; buffer will be left in args-buffer. So we change back to the |
dc556c64 RS |
138 | ;; original buffer. The reason I don't just use |
139 | ;; (let ((default-directory foo)) | |
140 | ;; (command-line-1 args)) | |
141 | ;; in the context of the original buffer is because let does not | |
142 | ;; work properly with buffer-local variables. | |
d543cc8e RS |
143 | (if (eq (current-buffer) args-buffer) |
144 | (set-buffer start-buffer))))) | |
145 | ||
078380ac | 146 | ;;;###autoload |
30c9c6d7 | 147 | (defun resume-suspend-hook () |
078380ac | 148 | "Clear out the file used for transmitting args when Emacs resumes." |
d543cc8e | 149 | (save-excursion |
078380ac | 150 | (set-buffer (get-buffer-create resume-emacs-args-buffer)) |
d543cc8e | 151 | (erase-buffer) |
078380ac | 152 | (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file))) |
d543cc8e | 153 | |
078380ac | 154 | (defun resume-write-buffer-to-file (buffer file) |
d543cc8e RS |
155 | "Writes the contents of BUFFER into FILE, if permissions allow." |
156 | (if (not (file-writable-p file)) | |
157 | (error "No permission to write file %s" file)) | |
158 | (save-excursion | |
159 | (set-buffer buffer) | |
160 | (clear-visited-file-modtime) | |
161 | (save-restriction | |
162 | (widen) | |
163 | (write-region (point-min) (point-max) file nil 'quiet)) | |
164 | (set-buffer-modified-p nil))) | |
c88ab9ce | 165 | |
5d2e242c KH |
166 | (provide 'resume) |
167 | ||
c88ab9ce | 168 | ;;; resume.el ends here |