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1 ;;; resume.el --- process command line args from within a suspended Emacs job
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2 ;; Copyright (C) 1988, 1992 Free Software Foundation, Inc.
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3
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4 ;; Author: Joe Wells <jbw@bucsf.bu.edu>
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5 ;; Adapted-By: ESR
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6 ;; Keywords: processes
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Synched up with: 19.34
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26
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27 ;;; Commentary:
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28
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29 ;; The purpose of this library is to handle command line arguments
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30 ;; when you resume an existing Emacs job.
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31
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32 ;; In order to use it, you must put this code in your .emacs file.
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33
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34 ;; (add-hook 'suspend-hook 'resume-suspend-hook)
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35 ;; (add-hook 'suspend-resume-hook 'resume-process-args)
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36
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37 ;; You can't get the benefit of this library by using the `emacs' command,
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38 ;; since that always starts a new Emacs job. Instead you must use a
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39 ;; command called `edit' which knows how to resume an existing Emacs job
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40 ;; if you have one, or start a new Emacs job if you don't have one.
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41
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42 ;; To define the `edit' command, run the script etc/emacs.csh (if you use CSH),
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43 ;; or etc/emacs.bash if you use BASH. You would normally do this in your
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44 ;; login script.
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45
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46 ;; Stephan Gildea suggested bug fix (gildea@bbn.com).
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47 ;; Ideas from Michael DeCorte and other people.
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48
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49 ;;; Code:
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50
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51 (defvar resume-emacs-args-file (expand-file-name "~/.emacs_args")
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52 "*This file is where arguments are placed for a suspended emacs job.")
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53
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54 (defvar resume-emacs-args-buffer " *Command Line Args*"
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55 "Buffer that is used by resume-process-args.")
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56
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57 (defun resume-process-args ()
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58 "Handler for command line args given when Emacs is resumed."
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59 (let ((start-buffer (current-buffer))
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60 (args-buffer (get-buffer-create resume-emacs-args-buffer))
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61 length args
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62 (command-line-default-directory default-directory))
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63 (unwind-protect
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64 (progn
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65 (set-buffer args-buffer)
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66 (erase-buffer)
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67 ;; get the contents of resume-emacs-args-file
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68 (condition-case ()
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69 (let ((result (insert-file-contents resume-emacs-args-file)))
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70 (setq length (car (cdr result))))
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71 ;; the file doesn't exist, ergo no arguments
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72 (file-error
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73 (erase-buffer)
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74 (setq length 0)))
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75 (if (<= length 0)
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76 (setq args nil)
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77 ;; get the arguments from the buffer
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78 (goto-char (point-min))
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79 (while (not (eobp))
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80 (skip-chars-forward " \t\n")
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81 (let ((begin (point)))
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82 (skip-chars-forward "^ \t\n")
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83 (setq args (cons (buffer-substring begin (point)) args)))
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84 (skip-chars-forward " \t\n"))
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85 ;; arguments are now in reverse order
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86 (setq args (nreverse args))
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87 ;; make sure they're not read again
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88 (erase-buffer))
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89 (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file)
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90 ;; if nothing was in buffer, args will be null
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91 (or (null args)
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92 (setq command-line-default-directory
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93 (file-name-as-directory (car args))
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94 args (cdr args)))
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95 ;; actually process the arguments
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96 ;; XEmacs: command-line-1 doesn't take a parameter
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97 (let ((command-line-args-left args))
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98 (command-line-1)))
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99 ;; If the command line args don't result in a find-file, the
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100 ;; buffer will be left in args-buffer. So we change back to the
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101 ;; original buffer. The reason I don't just use
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102 ;; (let ((default-directory foo))
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103 ;; (command-line-1 args))
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104 ;; in the context of the original buffer is because let does not
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105 ;; work properly with buffer-local variables.
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106 (if (eq (current-buffer) args-buffer)
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107 (set-buffer start-buffer)))))
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108
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109 ;;;###autoload
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110 (defun resume-suspend-hook ()
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111 "Clear out the file used for transmitting args when Emacs resumes."
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112 (save-excursion
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113 (set-buffer (get-buffer-create resume-emacs-args-buffer))
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114 (erase-buffer)
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115 (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file)))
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116
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117 (defun resume-write-buffer-to-file (buffer file)
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118 "Writes the contents of BUFFER into FILE, if permissions allow."
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119 (if (not (file-writable-p file))
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120 (error "No permission to write file %s" file))
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121 (save-excursion
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122 (set-buffer buffer)
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123 (clear-visited-file-modtime)
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124 (save-restriction
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125 (widen)
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126 (write-region (point-min) (point-max) file nil 'quiet))
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127 (set-buffer-modified-p nil)))
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128
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129 (provide 'resume)
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130
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131 ;;; resume.el ends here
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