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428
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1 ;;; gnuserv.el --- Lisp interface code between Emacs and gnuserv
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2 ;; Copyright (C) 1989-1997 Free Software Foundation, Inc.
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3
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456
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4 ;; Version: 3.12
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428
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5 ;; Author: Andy Norman (ange@hplb.hpl.hp.com), originally based on server.el
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6 ;; Hrvoje Niksic <hniksic@xemacs.org>
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7 ;; Maintainer: Jan Vroonhof <vroonhof@math.ethz.ch>,
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8 ;; Hrvoje Niksic <hniksic@xemacs.org>
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9 ;; Keywords: environment, processes, terminals
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10
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11 ;; This file is part of XEmacs.
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12
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13 ;; XEmacs is free software; you can redistribute it and/or modify it
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14 ;; under the terms of the GNU General Public License as published by
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15 ;; the Free Software Foundation; either version 2, or (at your option)
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16 ;; any later version.
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17
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18 ;; XEmacs is distributed in the hope that it will be useful, but
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19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 ;; General Public License for more details.
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22
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23 ;; You should have received a copy of the GNU General Public License
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24 ;; along with XEmacs; see the file COPYING. If not, write to the
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25 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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26 ;; Boston, MA 02111-1307, USA.
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27
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28 ;;; Synched up with: Not in FSF.
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29
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30 ;;; Commentary:
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31
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32 ;; Gnuserv is run when Emacs needs to operate as a server for other
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33 ;; processes. Specifically, any number of files can be attached for
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34 ;; editing to a running XEmacs process using the `gnuclient' program.
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35
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36 ;; Use `M-x gnuserv-start' to start the server and `gnuclient files'
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37 ;; to load them to XEmacs. When you are done with a buffer, press
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38 ;; `C-x #' (`M-x gnuserv-edit'). You can put (gnuserv-start) to your
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39 ;; .emacs, and enable `gnuclient' as your Unix "editor". When all the
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40 ;; buffers for a client have been edited and exited with
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41 ;; `gnuserv-edit', the client "editor" will return to the program that
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42 ;; invoked it.
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43
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44 ;; Your editing commands and Emacs' display output go to and from the
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45 ;; terminal or X display in the usual way. If you are running under
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46 ;; X, a new X frame will be open for each gnuclient. If you are on a
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47 ;; TTY, this TTY will be attached as a new device to the running
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48 ;; XEmacs, and will be removed once you are done with the buffer.
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49
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50 ;; To evaluate a Lisp form in a running Emacs, use the `-eval'
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51 ;; argument of gnuclient. To simplify this, we provide the `gnudoit'
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52 ;; shell script. For example `gnudoit "(+ 2 3)"' will print `5',
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53 ;; whereas `gnudoit "(gnus)"' will fire up your favorite newsreader.
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54 ;; Like gnuclient, `gnudoit' requires the server to be started prior
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55 ;; to using it.
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56
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57 ;; For more information you can refer to man pages of gnuclient,
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58 ;; gnudoit and gnuserv, distributed with XEmacs.
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59
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60 ;; gnuserv.el was originally written by Andy Norman as an improvement
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61 ;; over William Sommerfeld's server.el. Since then, a number of
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62 ;; people have worked on it, including Bob Weiner, Darell Kindred,
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63 ;; Arup Mukherjee, Ben Wing and Jan Vroonhof. It was completely
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64 ;; rewritten (labeled as version 3) by Hrvoje Niksic in May 1997. The
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65 ;; new code will not run on GNU Emacs.
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66
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67 ;; Jan Vroonhof <vroonhof@math.ethz.ch> July/1996
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68 ;; ported the server-temp-file-regexp feature from server.el
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69 ;; ported server hooks from server.el
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70 ;; ported kill-*-query functions from server.el (and made it optional)
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71 ;; synced other behavior with server.el
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72 ;;
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73 ;; Jan Vroonhof
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74 ;; Customized.
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75 ;;
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76 ;; Hrvoje Niksic <hniksic@xemacs.org> May/1997
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77 ;; Completely rewritten. Now uses `defstruct' and other CL stuff
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78 ;; to define clients cleanly. Many thanks to Dave Gillespie!
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79 ;;
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80 ;; Mike Scheidler <c23mts@eng.delcoelect.com> July, 1997
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81 ;; Added 'Done' button to the menubar.
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82
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83
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84 ;;; Code:
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85
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86 (defgroup gnuserv nil
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87 "The gnuserv suite of programs to talk to Emacs from outside."
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88 :group 'environment
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89 :group 'processes
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90 :group 'terminals)
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91
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92
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93 ;; Provide the old variables as aliases, to avoid breaking .emacs
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94 ;; files. However, they are obsolete and should be converted to the
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95 ;; new forms. This ugly crock must be before the variable
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96 ;; declaration, or the scheme fails.
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97
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98 (define-obsolete-variable-alias 'server-frame 'gnuserv-frame)
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99 (define-obsolete-variable-alias 'server-done-function
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100 'gnuserv-done-function)
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101 (define-obsolete-variable-alias 'server-done-temp-file-function
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102 'gnuserv-done-temp-file-function)
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103 (define-obsolete-variable-alias 'server-find-file-function
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104 'gnuserv-find-file-function)
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105 (define-obsolete-variable-alias 'server-program
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106 'gnuserv-program)
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107 (define-obsolete-variable-alias 'server-visit-hook
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108 'gnuserv-visit-hook)
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109 (define-obsolete-variable-alias 'server-done-hook
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110 'gnuserv-done-hook)
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111 (define-obsolete-variable-alias 'server-kill-quietly
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112 'gnuserv-kill-quietly)
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113 (define-obsolete-variable-alias 'server-temp-file-regexp
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114 'gnuserv-temp-file-regexp)
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115 (define-obsolete-variable-alias 'server-make-temp-file-backup
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116 'gnuserv-make-temp-file-backup)
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117
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118 ;;;###autoload
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119 (defcustom gnuserv-frame nil
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120 "*The frame to be used to display all edited files.
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121 If nil, then a new frame is created for each file edited.
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122 If t, then the currently selected frame will be used.
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123 If a function, then this will be called with a symbol `x' or `tty' as the
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124 only argument, and its return value will be interpreted as above."
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125 :tag "Gnuserv Frame"
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126 :type '(radio (const :tag "Create new frame each time" nil)
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127 (const :tag "Use selected frame" t)
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128 (function-item :tag "Use main Emacs frame"
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129 gnuserv-main-frame-function)
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130 (function-item :tag "Use visible frame, otherwise create new"
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131 gnuserv-visible-frame-function)
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132 (function-item :tag "Create special Gnuserv frame and use it"
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133 gnuserv-special-frame-function)
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134 (function :tag "Other"))
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135 :group 'gnuserv
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136 :group 'frames)
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137
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138 (defcustom gnuserv-frame-plist nil
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139 "*Plist of frame properties for creating a gnuserv frame."
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140 :type 'plist
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141 :group 'gnuserv
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142 :group 'frames)
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143
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144 (defcustom gnuserv-done-function 'kill-buffer
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145 "*Function used to remove a buffer after editing.
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146 It is called with one BUFFER argument. Functions such as `kill-buffer' and
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147 `bury-buffer' are good values. See also `gnuserv-done-temp-file-function'."
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148 :type '(radio (function-item kill-buffer)
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149 (function-item bury-buffer)
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150 (function :tag "Other"))
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151 :group 'gnuserv)
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152
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153 (defcustom gnuserv-done-temp-file-function 'kill-buffer
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154 "*Function used to remove a temporary buffer after editing.
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155 It is called with one BUFFER argument. Functions such as `kill-buffer' and
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156 `bury-buffer' are good values. See also `gnuserv-done-temp-file-function'."
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157 :type '(radio (function-item kill-buffer)
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158 (function-item bury-buffer)
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159 (function :tag "Other"))
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160 :group 'gnuserv)
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161
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162 (defcustom gnuserv-find-file-function 'find-file
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163 "*Function to visit a file with.
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164 It takes one argument, a file name to visit."
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165 :type 'function
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166 :group 'gnuserv)
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167
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168 (defcustom gnuserv-view-file-function 'view-file
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169 "*Function to view a file with.
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170 It takes one argument, a file name to view."
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171 :type '(radio (function-item view-file)
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172 (function-item find-file-read-only)
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173 (function :tag "Other"))
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174 :group 'gnuserv)
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175
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176 (defcustom gnuserv-program "gnuserv"
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177 "*Program to use as the editing server."
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178 :type 'string
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179 :group 'gnuserv)
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180
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181 (defcustom gnuserv-visit-hook nil
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182 "*Hook run after visiting a file."
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183 :type 'hook
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184 :group 'gnuserv)
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185
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186 (defcustom gnuserv-done-hook nil
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187 "*Hook run when done editing a buffer for the Emacs server.
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188 The hook functions are called after the file has been visited, with the
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189 current buffer set to the visiting buffer."
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190 :type 'hook
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191 :group 'gnuserv)
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192
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193 (defcustom gnuserv-init-hook nil
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194 "*Hook run after the server is started."
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195 :type 'hook
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196 :group 'gnuserv)
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197
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198 (defcustom gnuserv-shutdown-hook nil
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199 "*Hook run before the server exits."
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200 :type 'hook
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201 :group 'gnuserv)
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202
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203 (defcustom gnuserv-kill-quietly nil
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204 "*Non-nil means to kill buffers with clients attached without requiring confirmation."
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205 :type 'boolean
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206 :group 'gnuserv)
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207
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208 (defcustom gnuserv-temp-file-regexp
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209 (concat "^" (temp-directory) "/Re\\|/draft$")
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210 "*Regexp which should match filenames of temporary files deleted
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211 and reused by the programs that invoke the Emacs server."
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212 :type 'regexp
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213 :group 'gnuserv)
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214
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215 (defcustom gnuserv-make-temp-file-backup nil
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216 "*Non-nil makes the server backup temporary files also."
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217 :type 'boolean
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218 :group 'gnuserv)
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219
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220
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221 ;;; Internal variables:
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222
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223 (defstruct gnuclient
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224 "An object that encompasses several buffers in one.
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225 Normally, a client connecting to Emacs will be assigned an id, and
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226 will request editing of several files.
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227
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228 ID - Client id (integer).
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229 BUFFERS - List of buffers that \"belong\" to the client.
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230 NOTE: one buffer can belong to several clients.
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231 DEVICE - The device this client is on. If the device was also created.
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232 by a client, it will be placed to `gnuserv-devices' list.
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233 FRAME - Frame created by the client, or nil if the client didn't
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234 create a frame.
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235
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236 All the slots default to nil."
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237 (id nil)
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238 (buffers nil)
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239 (device nil)
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240 (frame nil))
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241
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242 (defvar gnuserv-process nil
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243 "The current gnuserv process.")
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244
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245 (defvar gnuserv-string ""
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246 "The last input string from the server.")
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247
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248 (defvar gnuserv-current-client nil
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249 "The client we are currently talking to.")
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250
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251 (defvar gnuserv-clients nil
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252 "List of current gnuserv clients.
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253 Each element is a gnuclient structure that identifies a client.")
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254
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255 (defvar gnuserv-devices nil
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256 "List of devices created by clients.")
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257
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258 (defvar gnuserv-special-frame nil
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259 "Frame created specially for Server.")
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260
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261 ;; We want the client-infested buffers to have some modeline
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262 ;; identification, so we'll make a "minor mode".
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263 (defvar gnuserv-minor-mode nil)
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264 (make-variable-buffer-local 'gnuserv-mode)
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265 (pushnew '(gnuserv-minor-mode " Server") minor-mode-alist
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266 :test 'equal)
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267
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268
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269 ;; Sample gnuserv-frame functions
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270
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271 (defun gnuserv-main-frame-function (type)
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272 "Return a sensible value for the main Emacs frame."
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273 (if (or (eq type 'x)
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462
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274 (eq type 'gtk)
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428
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275 (eq type 'mswindows))
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276 (car (frame-list))
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277 nil))
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278
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279 (defun gnuserv-visible-frame-function (type)
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280 "Return a frame if there is a frame that is truly visible, nil otherwise.
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281 This is meant in the X sense, so it will not return frames that are on another
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282 visual screen. Totally visible frames are preferred. If none found, return nil."
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283 (if (or (eq type 'x)
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462
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284 (eq type 'gtk)
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428
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285 (eq type 'mswindows))
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286 (cond ((car (filtered-frame-list 'frame-totally-visible-p
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287 (selected-device))))
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288 ((car (filtered-frame-list (lambda (frame)
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289 ;; eq t as in not 'hidden
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290 (eq t (frame-visible-p frame)))
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291 (selected-device)))))
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292 nil))
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293
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294 (defun gnuserv-special-frame-function (type)
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295 "Create a special frame for Gnuserv and return it on later invocations."
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296 (unless (frame-live-p gnuserv-special-frame)
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297 (setq gnuserv-special-frame (make-frame gnuserv-frame-plist)))
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298 gnuserv-special-frame)
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299
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300
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301 ;;; Communication functions
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302
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303 ;; We used to restart the server here, but it's too risky -- if
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304 ;; something goes awry, it's too easy to wind up in a loop.
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305 (defun gnuserv-sentinel (proc msg)
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306 (let ((msgstring (concat "Gnuserv process %s; restart with `%s'"))
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307 (keystring (substitute-command-keys "\\[gnuserv-start]")))
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308 (case (process-status proc)
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309 (exit
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310 (message msgstring "exited" keystring)
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311 (gnuserv-prepare-shutdown))
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312 (signal
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313 (message msgstring "killed" keystring)
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314 (gnuserv-prepare-shutdown))
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315 (closed
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316 (message msgstring "closed" keystring))
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317 (gnuserv-prepare-shutdown))))
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318
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319 ;; This function reads client requests from our current server. Every
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320 ;; client is identified by a unique ID within the server
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321 ;; (incidentally, the same ID is the file descriptor the server uses
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322 ;; to communicate to client).
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323 ;;
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324 ;; The request string can arrive in several chunks. As the request
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325 ;; ends with \C-d, we check for that character at the end of string.
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326 ;; If not found, keep reading, and concatenating to former strings.
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327 ;; So, if at first read we receive "5 (gn", that text will be stored
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328 ;; to gnuserv-string. If we then receive "us)\C-d", the two will be
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329 ;; concatenated, `current-client' will be set to 5, and `(gnus)' form
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330 ;; will be evaluated.
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331 ;;
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332 ;; Server will send the following:
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333 ;;
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334 ;; "ID <text>\C-d" (no quotes)
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335 ;;
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336 ;; ID - file descriptor of the given client;
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337 ;; <text> - the actual contents of the request.
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338 (defun gnuserv-process-filter (proc string)
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339 "Process gnuserv client requests to execute Emacs commands."
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340 (setq gnuserv-string (concat gnuserv-string string))
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341 ;; C-d means end of request.
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456
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342 (when (string-match "\C-d\n?\\'" gnuserv-string)
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343 (cond ((string-match "\\`[0-9]+" gnuserv-string) ; client request id
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428
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344 (let ((header (read-from-string gnuserv-string)))
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345 ;; Set the client we are talking to.
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346 (setq gnuserv-current-client (car header))
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347 ;; Evaluate the expression
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348 (condition-case oops
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349 (eval (car (read-from-string gnuserv-string (cdr header))))
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350 ;; In case of an error, write the description to the
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351 ;; client, and then signal it.
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352 (error (setq gnuserv-string "")
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434
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353 (when gnuserv-current-client
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354 (gnuserv-write-to-client gnuserv-current-client oops))
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428
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355 (setq gnuserv-current-client nil)
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356 (signal (car oops) (cdr oops)))
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357 (quit (setq gnuserv-string "")
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434
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358 (when gnuserv-current-client
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359 (gnuserv-write-to-client gnuserv-current-client oops))
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428
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360 (setq gnuserv-current-client nil)
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361 (signal 'quit nil)))
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362 (setq gnuserv-string "")))
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363 (t
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456
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364 (let ((response (car (split-string gnuserv-string "\C-d"))))
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365 (setq gnuserv-string "")
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366 (error "%s: invalid response from gnuserv" response))))))
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428
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367
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368 ;; This function is somewhat of a misnomer. Actually, we write to the
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369 ;; server (using `process-send-string' to gnuserv-process), which
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370 ;; interprets what we say and forwards it to the client. The
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371 ;; incantation server understands is (from gnuserv.c):
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372 ;;
|
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373 ;; "FD/LEN:<text>\n" (no quotes)
|
|
|
374 ;; FD - file descriptor of the given client (which we obtained from
|
|
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375 ;; the server earlier);
|
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|
376 ;; LEN - length of the stuff we are about to send;
|
|
|
377 ;; <text> - the actual contents of the request.
|
|
|
378 (defun gnuserv-write-to-client (client-id form)
|
|
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379 "Write the given form to the given client via the gnuserv process."
|
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380 (when (eq (process-status gnuserv-process) 'run)
|
|
|
381 (let* ((result (format "%s" form))
|
|
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382 (s (format "%s/%d:%s\n" client-id
|
|
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383 (length result) result)))
|
|
|
384 (process-send-string gnuserv-process s))))
|
|
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385
|
|
|
386 ;; The following two functions are helper functions, used by
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387 ;; gnuclient.
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388
|
|
|
389 (defun gnuserv-eval (form)
|
|
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390 "Evaluate form and return result to client."
|
|
|
391 (gnuserv-write-to-client gnuserv-current-client (eval form))
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|
|
392 (setq gnuserv-current-client nil))
|
|
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393
|
|
|
394 (defun gnuserv-eval-quickly (form)
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|
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395 "Let client know that we've received the request, and then eval the form.
|
|
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396 This order is important as not to keep the client waiting."
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397 (gnuserv-write-to-client gnuserv-current-client nil)
|
|
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398 (setq gnuserv-current-client nil)
|
|
|
399 (eval form))
|
|
|
400
|
|
|
401
|
|
|
402 ;; "Execute" a client connection, called by gnuclient. This is the
|
|
|
403 ;; backbone of gnuserv.el.
|
|
|
404 (defun gnuserv-edit-files (type list &rest flags)
|
|
|
405 "For each (line-number . file) pair in LIST, edit the file at line-number.
|
|
|
406 The visited buffers are memorized, so that when \\[gnuserv-edit] is invoked
|
|
|
407 in such a buffer, or when it is killed, or the client's device deleted, the
|
|
|
408 client will be invoked that the edit is finished.
|
|
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409
|
|
|
410 TYPE should either be a (tty TTY TERM PID) list, or (x DISPLAY) list.
|
|
|
411 If a flag is `quick', just edit the files in Emacs.
|
|
|
412 If a flag is `view', view the files read-only."
|
|
|
413 (let (quick view)
|
|
|
414 (mapc (lambda (flag)
|
|
|
415 (case flag
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|
|
416 (quick (setq quick t))
|
|
|
417 (view (setq view t))
|
|
|
418 (t (error "Invalid flag %s" flag))))
|
|
|
419 flags)
|
|
|
420 (let* ((old-device-num (length (device-list)))
|
|
|
421 (new-frame nil)
|
|
|
422 (dest-frame (if (functionp gnuserv-frame)
|
|
|
423 (funcall gnuserv-frame (car type))
|
|
|
424 gnuserv-frame))
|
|
|
425 ;; The gnuserv-frame dependencies are ugly, but it's
|
|
|
426 ;; extremely hard to make that stuff cleaner without
|
|
|
427 ;; breaking everything in sight.
|
|
|
428 (device (cond ((frame-live-p dest-frame)
|
|
|
429 (frame-device dest-frame))
|
|
|
430 ((null dest-frame)
|
|
|
431 (case (car type)
|
|
|
432 (tty (apply 'make-tty-device (cdr type)))
|
|
462
|
433 (gtk (make-gtk-device))
|
|
428
|
434 (x (make-x-device (cadr type)))
|
|
|
435 (mswindows (make-mswindows-device))
|
|
|
436 (t (error "Invalid device type"))))
|
|
|
437 (t
|
|
|
438 (selected-device))))
|
|
|
439 (frame (cond ((frame-live-p dest-frame)
|
|
|
440 dest-frame)
|
|
|
441 ((null dest-frame)
|
|
|
442 (setq new-frame (make-frame gnuserv-frame-plist
|
|
|
443 device))
|
|
|
444 new-frame)
|
|
|
445 (t (selected-frame))))
|
|
|
446 (client (make-gnuclient :id gnuserv-current-client
|
|
|
447 :device device
|
|
|
448 :frame new-frame)))
|
|
|
449 (select-frame frame)
|
|
|
450 (setq gnuserv-current-client nil)
|
|
|
451 ;; If the device was created by this client, push it to the list.
|
|
|
452 (and (/= old-device-num (length (device-list)))
|
|
|
453 (push device gnuserv-devices))
|
|
|
454 (and (frame-iconified-p frame)
|
|
|
455 (deiconify-frame frame))
|
|
|
456 ;; Visit all the listed files.
|
|
|
457 (while list
|
|
|
458 (let ((line (caar list)) (path (cdar list)))
|
|
|
459 (select-frame frame)
|
|
|
460 ;; Visit the file.
|
|
|
461 (funcall (if view
|
|
|
462 gnuserv-view-file-function
|
|
|
463 gnuserv-find-file-function)
|
|
|
464 path)
|
|
|
465 (goto-line line)
|
|
|
466 ;; Don't memorize the quick and view buffers.
|
|
|
467 (unless (or quick view)
|
|
|
468 (pushnew (current-buffer) (gnuclient-buffers client))
|
|
|
469 (setq gnuserv-minor-mode t)
|
|
|
470 ;; Add the "Done" button to the menubar, only in this buffer.
|
|
|
471 (if (and (featurep 'menubar) current-menubar)
|
|
|
472 (progn (set-buffer-menubar current-menubar)
|
|
|
473 (add-menu-button nil ["Done" gnuserv-edit]))
|
|
|
474 ))
|
|
|
475 (run-hooks 'gnuserv-visit-hook)
|
|
|
476 (pop list)))
|
|
|
477 (cond
|
|
|
478 ((and (or quick view)
|
|
|
479 (device-on-window-system-p device))
|
|
|
480 ;; Exit if on X device, and quick or view. NOTE: if the
|
|
|
481 ;; client is to finish now, it must absolutely /not/ be
|
|
|
482 ;; included to the list of clients. This way the client-ids
|
|
|
483 ;; should be unique.
|
|
|
484 (gnuserv-write-to-client (gnuclient-id client) nil))
|
|
|
485 (t
|
|
|
486 ;; Else, the client gets a vote.
|
|
|
487 (push client gnuserv-clients)
|
|
|
488 ;; Explain buffer exit options. If dest-frame is nil, the
|
|
|
489 ;; user can exit via `delete-frame'. OTOH, if FLAGS are nil
|
|
|
490 ;; and there are some buffers, the user can exit via
|
|
|
491 ;; `gnuserv-edit'.
|
|
|
492 (if (and (not (or quick view))
|
|
|
493 (gnuclient-buffers client))
|
|
|
494 (message "%s"
|
|
|
495 (substitute-command-keys
|
|
|
496 "Type `\\[gnuserv-edit]' to finish editing"))
|
|
|
497 (or dest-frame
|
|
|
498 (message "%s"
|
|
|
499 (substitute-command-keys
|
|
|
500 "Type `\\[delete-frame]' to finish editing")))))))))
|
|
|
501
|
|
|
502
|
|
|
503 ;;; Functions that hook into Emacs in various way to enable operation
|
|
|
504
|
|
|
505 ;; Defined later.
|
|
|
506 (add-hook 'kill-emacs-hook 'gnuserv-kill-all-clients t)
|
|
|
507
|
|
|
508 ;; A helper function; used by others. Try avoiding it whenever
|
|
|
509 ;; possible, because it is slow, and conses a list. Use
|
|
|
510 ;; `gnuserv-buffer-p' when appropriate, for instance.
|
|
|
511 (defun gnuserv-buffer-clients (buffer)
|
|
|
512 "Return a list of clients to which BUFFER belongs."
|
|
|
513 (let (res)
|
|
|
514 (dolist (client gnuserv-clients)
|
|
|
515 (when (memq buffer (gnuclient-buffers client))
|
|
|
516 (push client res)))
|
|
|
517 res))
|
|
|
518
|
|
|
519 ;; Like `gnuserv-buffer-clients', but returns a boolean; doesn't
|
|
|
520 ;; collect a list.
|
|
|
521 (defun gnuserv-buffer-p (buffer)
|
|
|
522 (member* buffer gnuserv-clients
|
|
|
523 :test 'memq
|
|
|
524 :key 'gnuclient-buffers))
|
|
|
525
|
|
|
526 ;; This function makes sure that a killed buffer is deleted off the
|
|
|
527 ;; list for the particular client.
|
|
|
528 ;;
|
|
|
529 ;; This hooks into `kill-buffer-hook'. It is *not* a replacement for
|
|
|
530 ;; `kill-buffer' (thanks God).
|
|
|
531 (defun gnuserv-kill-buffer-function ()
|
|
|
532 "Remove the buffer from the buffer lists of all the clients it belongs to.
|
|
|
533 Any client that remains \"empty\" after the removal is informed that the
|
|
|
534 editing has ended."
|
|
|
535 (let* ((buf (current-buffer)))
|
|
|
536 (dolist (client (gnuserv-buffer-clients buf))
|
|
|
537 (callf2 delq buf (gnuclient-buffers client))
|
|
|
538 ;; If no more buffers, kill the client.
|
|
|
539 (when (null (gnuclient-buffers client))
|
|
|
540 (gnuserv-kill-client client)))))
|
|
|
541
|
|
|
542 (add-hook 'kill-buffer-hook 'gnuserv-kill-buffer-function)
|
|
|
543
|
|
|
544 ;; Ask for confirmation before killing a buffer that belongs to a
|
|
|
545 ;; living client.
|
|
|
546 (defun gnuserv-kill-buffer-query-function ()
|
|
|
547 (or gnuserv-kill-quietly
|
|
|
548 (not (gnuserv-buffer-p (current-buffer)))
|
|
|
549 (yes-or-no-p
|
|
|
550 (format "Buffer %s belongs to gnuserv client(s); kill anyway? "
|
|
|
551 (current-buffer)))))
|
|
|
552
|
|
|
553 (add-hook 'kill-buffer-query-functions
|
|
|
554 'gnuserv-kill-buffer-query-function)
|
|
|
555
|
|
|
556 (defun gnuserv-kill-emacs-query-function ()
|
|
|
557 (or gnuserv-kill-quietly
|
|
|
558 (not (some 'gnuclient-buffers gnuserv-clients))
|
|
|
559 (yes-or-no-p "Gnuserv buffers still have clients; exit anyway? ")))
|
|
|
560
|
|
|
561 (add-hook 'kill-emacs-query-functions
|
|
|
562 'gnuserv-kill-emacs-query-function)
|
|
|
563
|
|
|
564 ;; If the device of a client is to be deleted, the client should die
|
|
|
565 ;; as well. This is why we hook into `delete-device-hook'.
|
|
|
566 (defun gnuserv-check-device (device)
|
|
|
567 (when (memq device gnuserv-devices)
|
|
|
568 (dolist (client gnuserv-clients)
|
|
|
569 (when (eq device (gnuclient-device client))
|
|
|
570 ;; we must make sure that the server kill doesn't result in
|
|
|
571 ;; killing the device, because it would cause a device-dead
|
|
|
572 ;; error when `delete-device' tries to do the job later.
|
|
|
573 (gnuserv-kill-client client t))))
|
|
|
574 (callf2 delq device gnuserv-devices))
|
|
|
575
|
|
|
576 (add-hook 'delete-device-hook 'gnuserv-check-device)
|
|
|
577
|
|
|
578 (defun gnuserv-temp-file-p (buffer)
|
|
|
579 "Return non-nil if BUFFER contains a file considered temporary.
|
|
|
580 These are files whose names suggest they are repeatedly
|
|
|
581 reused to pass information to another program.
|
|
|
582
|
|
|
583 The variable `gnuserv-temp-file-regexp' controls which filenames
|
|
|
584 are considered temporary."
|
|
|
585 (and (buffer-file-name buffer)
|
|
|
586 (string-match gnuserv-temp-file-regexp (buffer-file-name buffer))))
|
|
|
587
|
|
|
588 (defun gnuserv-kill-client (client &optional leave-frame)
|
|
|
589 "Kill the gnuclient CLIENT.
|
|
|
590 This will do away with all the associated buffers. If LEAVE-FRAME,
|
|
|
591 the function will not remove the frames associated with the client."
|
|
|
592 ;; Order is important: first delete client from gnuserv-clients, to
|
|
|
593 ;; prevent gnuserv-buffer-done-1 calling us recursively.
|
|
|
594 (callf2 delq client gnuserv-clients)
|
|
|
595 ;; Process the buffers.
|
|
|
596 (mapc 'gnuserv-buffer-done-1 (gnuclient-buffers client))
|
|
|
597 (unless leave-frame
|
|
|
598 (let ((device (gnuclient-device client)))
|
|
|
599 ;; kill frame created by this client (if any), unless
|
|
|
600 ;; specifically requested otherwise.
|
|
|
601 ;;
|
|
|
602 ;; note: last frame on a device will not be deleted here.
|
|
|
603 (when (and (gnuclient-frame client)
|
|
|
604 (frame-live-p (gnuclient-frame client))
|
|
|
605 (second (device-frame-list device)))
|
|
|
606 (delete-frame (gnuclient-frame client)))
|
|
|
607 ;; If the device is live, created by a client, and no longer used
|
|
|
608 ;; by any client, delete it.
|
|
|
609 (when (and (device-live-p device)
|
|
|
610 (memq device gnuserv-devices)
|
|
|
611 (second (device-list))
|
|
|
612 (not (member* device gnuserv-clients
|
|
|
613 :key 'gnuclient-device)))
|
|
|
614 ;; `gnuserv-check-device' will remove it from `gnuserv-devices'.
|
|
|
615 (delete-device device))))
|
|
|
616 ;; Notify the client.
|
|
|
617 (gnuserv-write-to-client (gnuclient-id client) nil))
|
|
|
618
|
|
|
619 ;; Do away with the buffer.
|
|
|
620 (defun gnuserv-buffer-done-1 (buffer)
|
|
|
621 (dolist (client (gnuserv-buffer-clients buffer))
|
|
|
622 (callf2 delq buffer (gnuclient-buffers client))
|
|
|
623 (when (null (gnuclient-buffers client))
|
|
|
624 (gnuserv-kill-client client)))
|
|
|
625 ;; Get rid of the buffer.
|
|
|
626 (save-excursion
|
|
|
627 (set-buffer buffer)
|
|
|
628 (run-hooks 'gnuserv-done-hook)
|
|
|
629 (setq gnuserv-minor-mode nil)
|
|
|
630 ;; Delete the menu button.
|
|
|
631 (if (and (featurep 'menubar) current-menubar)
|
|
|
632 (delete-menu-item '("Done")))
|
|
|
633 (funcall (if (gnuserv-temp-file-p buffer)
|
|
|
634 gnuserv-done-temp-file-function
|
|
|
635 gnuserv-done-function)
|
|
|
636 buffer)))
|
|
|
637
|
|
|
638
|
|
|
639 ;;; Higher-level functions
|
|
|
640
|
|
|
641 ;; Choose a `next' server buffer, according to several criteria, and
|
|
|
642 ;; return it. If none are found, return nil.
|
|
|
643 (defun gnuserv-next-buffer ()
|
|
|
644 (let* ((frame (selected-frame))
|
|
|
645 (device (selected-device))
|
|
|
646 client)
|
|
|
647 (cond
|
|
|
648 ;; If we have a client belonging to this frame, return
|
|
|
649 ;; the first buffer from it.
|
|
|
650 ((setq client
|
|
|
651 (car (member* frame gnuserv-clients :key 'gnuclient-frame)))
|
|
|
652 (car (gnuclient-buffers client)))
|
|
|
653 ;; Else, look for a device.
|
|
|
654 ((and
|
|
|
655 (memq (selected-device) gnuserv-devices)
|
|
|
656 (setq client
|
|
|
657 (car (member* device gnuserv-clients :key 'gnuclient-device))))
|
|
|
658 (car (gnuclient-buffers client)))
|
|
|
659 ;; Else, try to find any client with at least one buffer, and
|
|
|
660 ;; return its first buffer.
|
|
|
661 ((setq client
|
|
|
662 (car (member-if-not #'null gnuserv-clients
|
|
|
663 :key 'gnuclient-buffers)))
|
|
|
664 (car (gnuclient-buffers client)))
|
|
|
665 ;; Oh, give up.
|
|
|
666 (t nil))))
|
|
|
667
|
|
|
668 (defun gnuserv-buffer-done (buffer)
|
|
|
669 "Mark BUFFER as \"done\" for its client(s).
|
|
|
670 Does the save/backup queries first, and calls `gnuserv-done-function'."
|
|
|
671 ;; Check whether this is the real thing.
|
|
|
672 (unless (gnuserv-buffer-p buffer)
|
|
|
673 (error "%s does not belong to a gnuserv client" buffer))
|
|
|
674 ;; Backup/ask query.
|
|
|
675 (if (gnuserv-temp-file-p buffer)
|
|
|
676 ;; For a temp file, save, and do NOT make a non-numeric backup
|
|
|
677 ;; Why does server.el explicitly back up temporary files?
|
|
|
678 (let ((version-control nil)
|
|
|
679 (buffer-backed-up (not gnuserv-make-temp-file-backup)))
|
|
|
680 (save-buffer))
|
|
|
681 (if (and (buffer-modified-p)
|
|
|
682 (y-or-n-p (concat "Save file " buffer-file-name "? ")))
|
|
|
683 (save-buffer buffer)))
|
|
|
684 (gnuserv-buffer-done-1 buffer))
|
|
|
685
|
|
|
686 ;; Called by `gnuserv-start-1' to clean everything. Hooked into
|
|
|
687 ;; `kill-emacs-hook', too.
|
|
|
688 (defun gnuserv-kill-all-clients ()
|
|
|
689 "Kill all the gnuserv clients. Ruthlessly."
|
|
|
690 (mapc 'gnuserv-kill-client gnuserv-clients))
|
|
|
691
|
|
|
692 ;; This serves to run the hook and reset
|
|
|
693 ;; `allow-deletion-of-last-visible-frame'.
|
|
|
694 (defun gnuserv-prepare-shutdown ()
|
|
|
695 (setq allow-deletion-of-last-visible-frame nil)
|
|
|
696 (run-hooks 'gnuserv-shutdown-hook))
|
|
|
697
|
|
|
698 ;; This is a user-callable function, too.
|
|
|
699 (defun gnuserv-shutdown ()
|
|
|
700 "Shutdown the gnuserv server, if one is currently running.
|
|
|
701 All the clients will be disposed of via the normal methods."
|
|
|
702 (interactive)
|
|
|
703 (gnuserv-kill-all-clients)
|
|
|
704 (when gnuserv-process
|
|
|
705 (set-process-sentinel gnuserv-process nil)
|
|
|
706 (gnuserv-prepare-shutdown)
|
|
|
707 (condition-case ()
|
|
|
708 (delete-process gnuserv-process)
|
|
|
709 (error nil))
|
|
|
710 (setq gnuserv-process nil)))
|
|
|
711
|
|
|
712 ;; Actually start the process. Kills all the clients before-hand.
|
|
|
713 (defun gnuserv-start-1 (&optional leave-dead)
|
|
|
714 ;; Shutdown the existing server, if any.
|
|
|
715 (gnuserv-shutdown)
|
|
|
716 ;; If we already had a server, clear out associated status.
|
|
|
717 (unless leave-dead
|
|
|
718 (setq gnuserv-string ""
|
|
|
719 gnuserv-current-client nil)
|
|
|
720 (let ((process-connection-type t))
|
|
|
721 (setq gnuserv-process
|
|
|
722 (start-process "gnuserv" nil gnuserv-program)))
|
|
|
723 (set-process-sentinel gnuserv-process 'gnuserv-sentinel)
|
|
|
724 (set-process-filter gnuserv-process 'gnuserv-process-filter)
|
|
|
725 (process-kill-without-query gnuserv-process)
|
|
|
726 (setq allow-deletion-of-last-visible-frame t)
|
|
|
727 (run-hooks 'gnuserv-init-hook)))
|
|
|
728
|
|
|
729
|
|
|
730 ;;; User-callable functions:
|
|
|
731
|
|
|
732 ;;;###autoload
|
|
|
733 (defun gnuserv-running-p ()
|
|
|
734 "Return non-nil if a gnuserv process is running from this XEmacs session."
|
|
|
735 (not (not gnuserv-process)))
|
|
|
736
|
|
|
737 ;;;###autoload
|
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738 (defun gnuserv-start (&optional leave-dead)
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739 "Allow this Emacs process to be a server for client processes.
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740 This starts a gnuserv communications subprocess through which
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741 client \"editors\" (gnuclient and gnudoit) can send editing commands to
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742 this Emacs job. See the gnuserv(1) manual page for more details.
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743
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744 Prefix arg means just kill any existing server communications subprocess."
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745 (interactive "P")
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746 (and gnuserv-process
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747 (not leave-dead)
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748 (message "Restarting gnuserv"))
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749 (gnuserv-start-1 leave-dead))
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750
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751 (defun gnuserv-edit (&optional count)
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752 "Mark the current gnuserv editing buffer as \"done\", and switch to next one.
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753
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754 Run with a numeric prefix argument, repeat the operation that number
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755 of times. If given a universal prefix argument, close all the buffers
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756 of this buffer's clients.
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757
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758 The `gnuserv-done-function' (bound to `kill-buffer' by default) is
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759 called to dispose of the buffer after marking it as done.
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760
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761 Files that match `gnuserv-temp-file-regexp' are considered temporary and
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762 are saved unconditionally and backed up if `gnuserv-make-temp-file-backup'
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763 is non-nil. They are disposed of using `gnuserv-done-temp-file-function'
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764 \(also bound to `kill-buffer' by default).
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765
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766 When all of a client's buffers are marked as \"done\", the client is notified."
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767 (interactive "P")
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768 (when (null count)
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769 (setq count 1))
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770 (cond ((numberp count)
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771 (while (natnump (decf count))
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772 (let ((frame (selected-frame)))
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773 (gnuserv-buffer-done (current-buffer))
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774 (when (eq frame (selected-frame))
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775 ;; Switch to the next gnuserv buffer. However, do this
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776 ;; only if we remain in the same frame.
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777 (let ((next (gnuserv-next-buffer)))
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778 (when next
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779 (switch-to-buffer next)))))))
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780 (count
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781 (let* ((buf (current-buffer))
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782 (clients (gnuserv-buffer-clients buf)))
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783 (unless clients
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784 (error "%s does not belong to a gnuserv client" buf))
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785 (mapc 'gnuserv-kill-client (gnuserv-buffer-clients buf))))))
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786
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787 (global-set-key "\C-x#" 'gnuserv-edit)
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788
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789 (provide 'gnuserv)
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790
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791 ;;; gnuserv.el ends here
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