1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
;;; help-macro.el --- Makes command line help such as help-for-help
;; Copyright (C) 1993, 1994, 1997 Free Software Foundation, Inc.
;; Author: Lynn Slater <lrs@indetech.com>
;; Maintainer: FSF
;; Created: : Mon Oct 1 11:42:39 1990
;; Adapted-By: ESR
;; This file is part of XEmacs.
;; XEmacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; XEmacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with XEmacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;; Synched up with: FSF 20.2.
;; This file supplies the macro make-help-screen which constructs
;; single character dispatching with browsable help such as that provided
;; by help-for-help. This can be used to make many modes easier to use; for
;; example, the Gnu Emacs Empire Tool uses this for every "nested" mode map
;; called from the main mode map.
;; The name of this package was changed from help-screen.el to
;; help-macro.el in order to fit in a 14-character limit.
;;-> *********************** Example of use *********************************
;;->(make-help-screen help-for-empire-redistribute-map
;;-> "c:civ m:mil p:population f:food ?"
;;-> "You have discovered the GEET redistribution commands
;;-> From here, you can use the following options:
;;->
;;->c Redistribute civs from overfull sectors into connected underfull ones
;;-> The functions typically named by empire-ideal-civ-fcn control
;;-> based in part on empire-sector-civ-threshold
;;->m Redistribute military using levels given by empire-ideal-mil-fcn
;;->p Redistribute excess population to highways for max pop growth
;;-> Excess is any sector so full babies will not be born.
;;->f Even out food on highways to highway min and leave levels
;;-> This is good to pump max food to all warehouses/dist pts
;;->
;;->
;;->Use \\[help-for-empire-redistribute-map] for help on redistribution.
;;->Use \\[help-for-empire-extract-map] for help on data extraction.
;;->Please use \\[describe-key] to find out more about any of the other keys."
;;-> empire-shell-redistribute-map)
;;-> (define-key c-mp "\C-h" 'help-for-empire-redistribute-map)
;;-> (define-key c-mp help-character 'help-for-empire-redistribute-map)
;;; Code:
(provide 'help-macro)
;;;###autoload
(defcustom three-step-help t
"*Non-nil means give more info about Help command in three steps.
The three steps are simple prompt, prompt with all options,
and window listing and describing the options.
A value of nil means skip the middle step, so that
\\[help-command] \\[help-command] gives the window that lists the options."
:type 'boolean
:group 'help-appearance)
(defmacro make-help-screen (fname help-line help-text helped-map)
"Construct help-menu function name FNAME.
When invoked, FNAME shows HELP-LINE and reads a command using HELPED-MAP.
If the command is the help character, FNAME displays HELP-TEXT
and continues trying to read a command using HELPED-MAP.
When FNAME finally does get a command, it executes that command
and then returns."
`(defun ,fname ()
,help-text
(interactive)
(flet ((help-read-key (prompt)
;; This is in `flet' to avoid problems with autoloading.
;; #### The function is ill-conceived -- there should be
;; a way to do it without all the hassle!
(let (events)
(while (not (key-press-event-p
(aref (setq events (read-key-sequence prompt)) 0)))
;; Mouse clicks are not part of the help feature, so
;; reexecute them in the standard environment.
(mapc 'dispatch-event events))
(let ((key (nconc (event-modifiers (aref events 0))
(list (event-key (aref events 0))))))
;; Make the HELP key translate to C-h.
(when (lookup-key function-key-map key)
(setq key (lookup-key function-key-map key)))
(if (eq (length key) 1)
(car key)
key)))))
(let ((line-prompt
(substitute-command-keys ,help-line)))
(when three-step-help
(message "%s" line-prompt))
(let* ((help-screen
(condition-case nil
(documentation (quote ,fname))
(void-function "(alias for undefined function)")
(error "(unexpected error from `documention')")))
;; We bind overriding-local-map for very small
;; sections, *excluding* where we switch buffers and
;; where we execute the chosen help command.
(local-map (make-sparse-keymap))
(minor-mode-map-alist nil)
(prev-frame (selected-frame))
config new-frame key)
(unwind-protect
(progn
(set-keymap-parents local-map (list ,helped-map))
(cond (three-step-help
(let* ((overriding-local-map local-map))
(setq key (help-read-key nil))))
(t
(setq key ??)))
(when (or (equal key ??)
(equal key (list help-char)))
(setq config (current-window-configuration))
(switch-to-buffer-other-window "*Help*")
(and (not (eq (window-frame (selected-window))
prev-frame))
(setq new-frame (window-frame (selected-window))
config nil))
(setq buffer-read-only nil)
(erase-buffer)
(insert help-screen)
(help-mode)
(goto-char (point-min))
(while (member key `((,help-char) ?? (control v) space ?\177
delete backspace (meta v)))
(ignore-errors
(cond ((member key '((control v) space))
(scroll-up))
((member key '(?\177 delete (meta v) backspace))
(scroll-down))))
(let ((cursor-in-echo-area t)
(overriding-local-map local-map))
(setq key (help-read-key
(format "Type one of the options listed%s: "
(if (pos-visible-in-window-p
(point-max))
"" " or Space to scroll")))))))
;; We don't need the prompt any more.
(message nil)
(let ((defn (lookup-key local-map key)))
(cond (defn
(when config
(set-window-configuration config)
(setq config nil))
(when new-frame
(iconify-frame new-frame)
(setq new-frame nil))
(call-interactively defn))
(t
(ding)))))
(and (get-buffer "*Help*")
(bury-buffer "*Help*"))
(and new-frame (iconify-frame new-frame))
(and config
(set-window-configuration config))))))))
;;; help-macro.el
|
