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1 ;;; help-macro.el --- Makes command line help such as help-for-help
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2
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3 ;; Copyright (C) 1993, 1994, 1997 Free Software Foundation, Inc.
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4
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5 ;; Author: Lynn Slater <lrs@indetech.com>
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6 ;; Maintainer: FSF
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7 ;; Created: : Mon Oct 1 11:42:39 1990
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8 ;; Adapted-By: ESR
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify
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13 ;; it under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful,
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18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 ;; GNU General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Commentary:
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28
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29 ;;; Synched up with: FSF 20.2.
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30
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31 ;; This file supplies the macro make-help-screen which constructs
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32 ;; single character dispatching with browsable help such as that provided
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33 ;; by help-for-help. This can be used to make many modes easier to use; for
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34 ;; example, the Gnu Emacs Empire Tool uses this for every "nested" mode map
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35 ;; called from the main mode map.
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36
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37 ;; The name of this package was changed from help-screen.el to
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38 ;; help-macro.el in order to fit in a 14-character limit.
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39
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40 ;;-> *********************** Example of use *********************************
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41
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42 ;;->(make-help-screen help-for-empire-redistribute-map
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43 ;;-> "c:civ m:mil p:population f:food ?"
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44 ;;-> "You have discovered the GEET redistribution commands
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45 ;;-> From here, you can use the following options:
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46 ;;->
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47 ;;->c Redistribute civs from overfull sectors into connected underfull ones
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48 ;;-> The functions typically named by empire-ideal-civ-fcn control
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49 ;;-> based in part on empire-sector-civ-threshold
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50 ;;->m Redistribute military using levels given by empire-ideal-mil-fcn
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51 ;;->p Redistribute excess population to highways for max pop growth
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52 ;;-> Excess is any sector so full babies will not be born.
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53 ;;->f Even out food on highways to highway min and leave levels
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54 ;;-> This is good to pump max food to all warehouses/dist pts
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55 ;;->
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56 ;;->
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57 ;;->Use \\[help-for-empire-redistribute-map] for help on redistribution.
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58 ;;->Use \\[help-for-empire-extract-map] for help on data extraction.
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59 ;;->Please use \\[describe-key] to find out more about any of the other keys."
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60 ;;-> empire-shell-redistribute-map)
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61
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62 ;;-> (define-key c-mp "\C-h" 'help-for-empire-redistribute-map)
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63 ;;-> (define-key c-mp help-character 'help-for-empire-redistribute-map)
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64
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65 ;;; Code:
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66
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67 (provide 'help-macro)
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68
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69 ;;;###autoload
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70 (defcustom three-step-help t
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71 "*Non-nil means give more info about Help command in three steps.
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72 The three steps are simple prompt, prompt with all options,
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73 and window listing and describing the options.
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74 A value of nil means skip the middle step, so that
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75 \\[help-command] \\[help-command] gives the window that lists the options."
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76 :type 'boolean
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77 :group 'help-appearance)
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78
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219
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79 ;;;###autoload
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211
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80 (defun help-read-key (prompt)
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81 (let (events)
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82 (while (not (key-press-event-p
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83 (aref (setq events (read-key-sequence prompt)) 0)))
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84 ;; Mouse clicks are not part of the help feature, so reexecute
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85 ;; them in the standard environment.
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86 (mapc 'dispatch-event events))
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87 (let ((key (nconc (event-modifiers (aref events 0))
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88 (list (event-key (aref events 0))))))
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89 ;; Make the HELP key translate to C-h.
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90 (when (lookup-key function-key-map key)
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91 (setq key (lookup-key function-key-map key)))
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92 (if (eq (length key) 1)
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93 (car key)
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94 key))))
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95
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96 (defmacro make-help-screen (fname help-line help-text helped-map)
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97 "Construct help-menu function name FNAME.
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98 When invoked, FNAME shows HELP-LINE and reads a command using HELPED-MAP.
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99 If the command is the help character, FNAME displays HELP-TEXT
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100 and continues trying to read a command using HELPED-MAP.
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101 When FNAME finally does get a command, it executes that command
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102 and then returns."
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103 `(defun ,fname ()
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104 ,help-text
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105 (interactive)
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106 (let ((line-prompt
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107 (substitute-command-keys ,help-line)))
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108 (when three-step-help
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109 (message "%s" line-prompt))
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110 (let* ((help-screen (documentation (quote ,fname)))
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111 ;; We bind overriding-local-map for very small
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112 ;; sections, *excluding* where we switch buffers
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113 ;; and where we execute the chosen help command.
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114 (local-map (make-sparse-keymap))
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115 (minor-mode-map-alist nil)
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116 (prev-frame (selected-frame))
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117 config new-frame key)
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118 (unwind-protect
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119 (progn
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120 (set-keymap-parents local-map (list ,helped-map))
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121 (cond (three-step-help
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122 (let* ((overriding-local-map local-map))
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123 (setq key (help-read-key nil))))
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124 (t
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125 (setq key ??)))
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126 (when (or (equal key ??)
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127 (equal key (list help-char)))
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128 (setq config (current-window-configuration))
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129 (switch-to-buffer-other-window "*Help*")
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130 (and (not (eq (window-frame (selected-window))
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131 prev-frame))
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132 (setq new-frame (window-frame (selected-window))
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133 config nil))
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134 (setq buffer-read-only nil)
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135 (erase-buffer)
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136 (insert help-screen)
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137 (help-mode)
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138 (goto-char (point-min))
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139 (while (member key `((,help-char) ?? (control v) space ?\177
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140 delete backspace (meta v)))
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141 (ignore-errors
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142 (cond ((member key '((control v) space))
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143 (scroll-up))
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144 ((member key '(?\177 delete (meta v) backspace))
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145 (scroll-down))))
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146 (let ((cursor-in-echo-area t)
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147 (overriding-local-map local-map))
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148 (setq key (help-read-key
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149 (format "Type one of the options listed%s: "
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150 (if (pos-visible-in-window-p
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151 (point-max))
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152 "" " or Space to scroll")))))))
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153 ;; We don't need the prompt any more.
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154 (message nil)
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155 (let ((defn (lookup-key local-map key)))
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156 (cond (defn
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157 (when config
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158 (set-window-configuration config)
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159 (setq config nil))
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160 (when new-frame
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161 (iconify-frame new-frame)
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162 (setq new-frame nil))
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163 (call-interactively defn))
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164 (t
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165 (ding)))))
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166 (and (get-buffer "*Help*")
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167 (bury-buffer "*Help*"))
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168 (and new-frame (iconify-frame new-frame))
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169 (and config
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170 (set-window-configuration config)))))))
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171
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172 ;;; help-macro.el
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173
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