| 1 | ;; Process command line arguments from within a suspended Emacs job |
| 2 | ;; Copyright (C) 1988 Free Software Foundation, Inc. |
| 3 | |
| 4 | ;; This file is not yet part of GNU Emacs, but soon will be. |
| 5 | |
| 6 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 7 | ;; but WITHOUT ANY WARRANTY. No author or distributor |
| 8 | ;; accepts responsibility to anyone for the consequences of using it |
| 9 | ;; or for whether it serves any particular purpose or works at all, |
| 10 | ;; unless he says so in writing. Refer to the GNU Emacs General Public |
| 11 | ;; License for full details. |
| 12 | |
| 13 | ;; Everyone is granted permission to copy, modify and redistribute |
| 14 | ;; GNU Emacs, but only under the conditions described in the |
| 15 | ;; GNU Emacs General Public License. A copy of this license is |
| 16 | ;; supposed to have been given to you along with GNU Emacs so you |
| 17 | ;; can know your rights and responsibilities. It should be in a |
| 18 | ;; file named COPYING. Among other things, the copyright notice |
| 19 | ;; and this notice must be preserved on all copies. |
| 20 | |
| 21 | ;; Created by: Joe Wells, jbw@bucsf.bu.edu |
| 22 | ;; Created on: 1988? |
| 23 | ;; Last modified by: Joe Wells, jbw@dodge |
| 24 | ;; Last modified on: Thu Jun 14 15:20:41 1990 |
| 25 | ;; Filename: resume.el |
| 26 | ;; Purpose: handle command line arguments when resuming suspended job |
| 27 | |
| 28 | ;; Stephen Gildea suggested bug fix (gildea@bbn.com). |
| 29 | ;; Ideas from Michael DeCorte and other people. |
| 30 | |
| 31 | ;; For csh users, insert the following alias in your .cshrc file |
| 32 | ;; (after removing the leading double semicolons, of course): |
| 33 | ;; |
| 34 | ;;# The following line could be just EMACS_CMD=emacs, but this depends on |
| 35 | ;;# your site. |
| 36 | ;;if (! $?EMACS_CMD) set EMACS_CMD=emacs |
| 37 | ;;set JOBS_FILE=/tmp/jobs.$USER.$$ |
| 38 | ;;set ARGS_FILE=~/.emacs_args |
| 39 | ;;set STOP_PATT='^\[[0-9]*\] *[ +-] Stopped ............ ' |
| 40 | ;;set SUNVIEW_CMD='emacstool -nw -f emacstool-init -f server-start' |
| 41 | ;;set X_CMD=\'\''$EMACS_CMD -i -f server-start' |
| 42 | ;;alias emacs \ |
| 43 | ;;' \\ |
| 44 | ;; jobs >! "$JOBS_FILE" \\ |
| 45 | ;; && grep "$STOP_PATT$EMACS_CMD" "$JOBS_FILE" >& /dev/null \\ |
| 46 | ;; && echo `pwd` \!* >! "$ARGS_FILE" && ""fg %$EMACS_CMD \\ |
| 47 | ;;|| if (! -e ~/.emacs_server || -f ~/.emacs_server) set status=1 \\ |
| 48 | ;; && emacsclient \!* \\ |
| 49 | ;;|| @ status=1 - $?DISPLAY && eval "$X_CMD -i \!* &" \\ |
| 50 | ;;|| @ status=1 - $?WINDOW_PARENT && eval "$SUNVIEW_CMD \!* &" \\ |
| 51 | ;;|| ""$EMACS_CMD -nw \!* \\ |
| 52 | ;;' |
| 53 | ;; |
| 54 | ;; The alias works as follows: |
| 55 | ;; 1. If there is a suspended Emacs job that is a child of the |
| 56 | ;; current shell, place its arguments in the ~/.emacs_args file and |
| 57 | ;; resume it. |
| 58 | ;; 2. Else if the ~/.emacs_server socket has been created, presume an |
| 59 | ;; Emacs server is running and attempt to connect to it. If no Emacs |
| 60 | ;; server is listening on the socket, this will fail. |
| 61 | ;; 3. Else if the DISPLAY environment variable is set, presume we are |
| 62 | ;; running under X Windows and start a new GNU Emacs process in the |
| 63 | ;; background as an X client. |
| 64 | ;; 4. Else if the WINDOW_PARENT environment variable is set, presume we |
| 65 | ;; are running under SunView and start an emacstool process in the |
| 66 | ;; background. |
| 67 | ;; 5. Else start a regular Emacs process. |
| 68 | ;; |
| 69 | ;; Notes: |
| 70 | ;; The output of the "jobs" command is not piped directly into "grep" |
| 71 | ;; because that would run the "jobs" command in a subshell. |
| 72 | ;; Before resuming a suspended emacs, the current directory and all |
| 73 | ;; command line arguments are placed in a file name ~/.emacs_args. |
| 74 | ;; The "-nw" switch to Emacs means no windowing system. |
| 75 | |
| 76 | ;; Insert this in your .emacs file: |
| 77 | ;;(setq suspend-resume-hook 'resume-process-args) |
| 78 | ;;(setq suspend-hook 'empty-args-file) |
| 79 | ;;(autoload 'empty-args-file "resume") |
| 80 | ;;(autoload 'resume-process-args "resume") |
| 81 | |
| 82 | ;; Finally, put the rest in a file named "resume.el" in a lisp library |
| 83 | ;; directory. |
| 84 | |
| 85 | (defvar emacs-args-file (expand-file-name "~/.emacs_args") |
| 86 | "*This file is where arguments are placed for a suspended emacs job.") |
| 87 | |
| 88 | (defvar emacs-args-buffer " *Command Line Args*" |
| 89 | "Buffer that is used by resume-process-args.") |
| 90 | |
| 91 | (defun resume-process-args () |
| 92 | "This should be called from inside of `suspend-resume-hook'. |
| 93 | This grabs the contents of the file whose name is stored in `emacs-args-file', |
| 94 | and processes these arguments like command line options." |
| 95 | (let ((start-buffer (current-buffer)) |
| 96 | (args-buffer (get-buffer-create emacs-args-buffer)) |
| 97 | length args) |
| 98 | (unwind-protect |
| 99 | (progn |
| 100 | (set-buffer args-buffer) |
| 101 | (erase-buffer) |
| 102 | ;; get the contents of emacs-args-file |
| 103 | (condition-case () |
| 104 | (let ((result (insert-file-contents emacs-args-file))) |
| 105 | (setq length (car (cdr result)))) |
| 106 | ;; the file doesn't exist, ergo no arguments |
| 107 | (file-error |
| 108 | (erase-buffer) |
| 109 | (setq length 0))) |
| 110 | (if (<= length 0) |
| 111 | (setq args nil) |
| 112 | ;; get the arguments from the buffer |
| 113 | (goto-char (point-min)) |
| 114 | (while (not (eobp)) |
| 115 | (skip-chars-forward " \t\n") |
| 116 | (let ((begin (point))) |
| 117 | (skip-chars-forward "^ \t\n") |
| 118 | (setq args (cons (buffer-substring begin (point)) args))) |
| 119 | (skip-chars-forward " \t\n")) |
| 120 | ;; arguments are now in reverse order |
| 121 | (setq args (nreverse args)) |
| 122 | ;; make sure they're not read again |
| 123 | (erase-buffer)) |
| 124 | (write-buffer-to-file (current-buffer) emacs-args-file) |
| 125 | ;; if nothing was in buffer, args will be null |
| 126 | (or (null args) |
| 127 | (setq default-directory (file-name-as-directory (car args)) |
| 128 | args (cdr args))) |
| 129 | ;; actually process the arguments |
| 130 | (command-line-1 args)) |
| 131 | ;; If the command line args don't result in a find-file, the |
| 132 | ;; buffer will be left in args-buffer. So we change back to the |
| 133 | ;; original buffer. The reason I don't just use |
| 134 | ;; (let ((default-directory foo)) |
| 135 | ;; (command-line-1 args)) |
| 136 | ;; in the context of the original buffer is because let does not |
| 137 | ;; work properly with buffer-local variables. |
| 138 | (if (eq (current-buffer) args-buffer) |
| 139 | (set-buffer start-buffer))))) |
| 140 | |
| 141 | (defun empty-args-file () |
| 142 | "This empties the contents of the file whose name is specified by |
| 143 | `emacs-args-file'." |
| 144 | (save-excursion |
| 145 | (set-buffer (get-buffer-create emacs-args-buffer)) |
| 146 | (erase-buffer) |
| 147 | (write-buffer-to-file (current-buffer) emacs-args-file))) |
| 148 | |
| 149 | (defun write-buffer-to-file (buffer file) |
| 150 | "Writes the contents of BUFFER into FILE, if permissions allow." |
| 151 | (if (not (file-writable-p file)) |
| 152 | (error "No permission to write file %s" file)) |
| 153 | (save-excursion |
| 154 | (set-buffer buffer) |
| 155 | (clear-visited-file-modtime) |
| 156 | (save-restriction |
| 157 | (widen) |
| 158 | (write-region (point-min) (point-max) file nil 'quiet)) |
| 159 | (set-buffer-modified-p nil))) |