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1 ;;; resume.el --- process command line args from within a suspended Emacs job
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2 ;; Keywords: processes
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3
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4 ;; Copyright (C) 1988 Free Software Foundation, Inc.
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5
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6 ;; This file is not yet part of GNU Emacs, but soon will be.
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7
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8 ;; GNU Emacs is distributed in the hope that it will be useful,
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9 ;; but WITHOUT ANY WARRANTY. No author or distributor
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10 ;; accepts responsibility to anyone for the consequences of using it
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11 ;; or for whether it serves any particular purpose or works at all,
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12 ;; unless he says so in writing. Refer to the GNU Emacs General Public
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13 ;; License for full details.
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14
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15 ;; Everyone is granted permission to copy, modify and redistribute
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16 ;; GNU Emacs, but only under the conditions described in the
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17 ;; GNU Emacs General Public License. A copy of this license is
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18 ;; supposed to have been given to you along with GNU Emacs so you
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19 ;; can know your rights and responsibilities. It should be in a
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20 ;; file named COPYING. Among other things, the copyright notice
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21 ;; and this notice must be preserved on all copies.
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22 ;;
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23 ;;; Synched up with: Not synched with FSF but close to 19.28.
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24
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25 ;; by Joe Wells
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26 ;; jbw@bucsf.bu.edu
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27 ;; joew@uswat.uswest.com (maybe, ... the mailer there sucks)
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28
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29 ;; Stephan Gildea suggested bug fix (gildea@bbn.com).
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30 ;; Ideas from Michael DeCorte and other people.
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31
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32 ;; For csh users, insert the following alias in your .cshrc file
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33 ;; (after removing the leading double semicolons):
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34 ;;
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35 ;;# The following line could be just EMACS=emacs, but this depends on
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36 ;;# your site.
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37 ;;set EMACS=emacs
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38 ;;set EMACS_PATTERN="^\[[0-9]\] . Stopped ............ $EMACS"
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39 ;;alias emacs \
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40 ;;' \\
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41 ;; jobs >! /tmp/jobs$$ \\
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42 ;; && grep "$EMACS_PATTERN" /tmp/jobs$$ >& /dev/null \\
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43 ;; && echo `pwd` \!* >! ~/.emacs_args && eval "%$EMACS" \\
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44 ;;|| test -S ~/.emacs_server && emacsclient \!* \\
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45 ;;|| test "$?DISPLAY" = 1 && eval "\$EMACS -i \!* &" \\
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46 ;;|| test "$?WINDOW_PARENT" = 1 && eval "emacstool -f emacstool-init \!* &" \\
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47 ;;|| eval "\$EMACS -nw \!*"'
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48 ;;
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49 ;; The alias works as follows:
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50 ;; 1. If there is a suspended emacs jobs that is a child of the
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51 ;; current shell, place its arguments in the ~/.emacs_args file and
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52 ;; resume it.
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53 ;; 2. Else if the ~/.emacs_server socket has been created, presume an
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54 ;; emacs server is running and attempt to connect to it. If no emacs
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55 ;; server is listening on the socket, this will fail.
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56 ;; 3. Else if the DISPLAY environment variable is set, presume we are
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57 ;; running under X Windows and start a new X Gnu Emacs process in the
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58 ;; background.
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59 ;; 4. Else if the WINDOW_PARENT environment variable is set, presume we
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60 ;; are running under Sunview and Suntools and start an emacstool
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61 ;; process in the background.
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62 ;; 5. Else start a regular emacs process.
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63 ;;
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64 ;; Notes:
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65 ;; "test -S" checks if a unix domain socket by that name exists.
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66 ;; The output of the "jobs" command is not piped directly into "grep"
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67 ;; because that would run the "jobs" command in a subshell.
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68 ;; Before resuming a suspended emacs, the current directory and all
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69 ;; command line arguments are placed in a file.
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70 ;; The command to run emacs is always preceded by a \ to prevent
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71 ;; possible alias loops.
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72 ;; The "-nw" switch in the last line is is undocumented, and it means
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73 ;; no windowing system.
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74
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75 (setq suspend-resume-hook 'resume-process-args)
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76 (setq suspend-hook 'resume-preparation)
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77
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78 (defvar emacs-args-file "~/.emacs_args"
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79 "*This file is where arguments are placed for a suspended emacs job.")
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80
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81 (defun resume-preparation ()
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82 (condition-case ()
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83 (delete-file emacs-args-file)
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84 (error nil)))
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85
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86 (defun resume-process-args ()
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87 "This should be called from inside of suspend-resume-hook.
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88 Grabs the contents of the file whose name is stored in
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89 emacs-args-file, and processes these arguments like command line options."
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90 (let ((resume-start-buffer (current-buffer))
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91 (resume-args-buffer (get-buffer-create " *Command Line Args*"))
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92 resume-args)
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93 (unwind-protect
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94 (progn
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95 (set-buffer resume-args-buffer)
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96 (erase-buffer)
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97 ;; Get the contents of emacs-args-file, then delete the file.
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98 (condition-case ()
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99 (progn
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100 (insert-file-contents emacs-args-file)
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101 (delete-file emacs-args-file))
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102 ;; The file doesn't exist or we can't delete it, ergo no arguments.
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103 ;; (If we can't delete it now, we probably couldn't delete it
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104 ;; before suspending, and that implies it may be vestigial.)
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105 (file-error (erase-buffer)))
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106 ;; Get the arguments from the buffer.
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107 (goto-char (point-min))
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108 (while (progn (skip-chars-forward " \t\n") (not (eobp)))
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109 (setq resume-args
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110 (cons (buffer-substring (point)
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111 (progn
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112 (skip-chars-forward "^ \t\n")
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113 (point)))
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114 resume-args)))
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115 (cond (resume-args
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116 ;; Arguments are now in reverse order.
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117 (setq resume-args (nreverse resume-args))
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118 ;; The "first argument" is really a default directory to use
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119 ;; while processing the rest of the arguments.
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120 (setq default-directory (concat (car resume-args) "/"))
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121 ;; Actually process the arguments.
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122 (command-line-1 (cdr resume-args)))))
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123 ;; If the command line args don't result in a find-file, the
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124 ;; buffer will be left in resume-args-buffer. So we change back to the
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125 ;; original buffer. The reason I don't just use
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126 ;; (let ((default-directory foo))
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127 ;; (command-line-1 args))
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128 ;; in the context of the original buffer is because let does not
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129 ;; work properly with buffer-local variables.
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130 (if (eq (current-buffer) resume-args-buffer)
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131 (set-buffer resume-start-buffer)))))
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