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1 | ;;; help-screen.el --- Makes command line help such as help-for-help |
2 | ||
3 | ;; Copyright (C) 1993 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Lynn Slater <lrs@indetech.com> | |
6 | ;; Created: : Mon Oct 1 11:42:39 1990 | |
7 | ;; Adapted-By: ESR | |
8 | ;; Last Modified By: Lynn Slater x2048 | |
9 | ;; Last Modified On: Mon Sep 23 14:40:19 1991 | |
10 | ||
11 | ;; This file is part of GNU Emacs. | |
12 | ||
13 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
14 | ;; it under the terms of the GNU General Public License as published by | |
15 | ;; the Free Software Foundation; either version 2, or (at your option) | |
16 | ;; any later version. | |
17 | ||
18 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
19 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | ;; GNU General Public License for more details. | |
22 | ||
23 | ;; You should have received a copy of the GNU General Public License | |
24 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
25 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | ||
27 | ;;; Commentary: | |
28 | ;; | |
29 | ;; This file supplies the macro make-help-screen which constructs | |
30 | ;; single character dispatching with browsable help such as that provided | |
31 | ;; by help-for-help. This can be used to make many modes easier to use; for | |
32 | ;; example, the Gnu Emacs Empire Tool uses this for every "nested" mode map | |
33 | ;; called from the main mode map. | |
34 | ||
35 | ;;-> *********************** Example of use ********************************* | |
36 | ||
37 | ;;->(make-help-screen help-for-empire-redistribute-map | |
38 | ;;-> "c:civ m:mil p:population f:food ?" | |
39 | ;;-> "You have discovered the GEET redistribution commands | |
40 | ;;-> From here, you can use the following options: | |
41 | ;;-> | |
42 | ;;->c Redistribute civs from overfull sectors into connected underfull ones | |
43 | ;;-> The functions typically named by empire-ideal-civ-fcn control | |
44 | ;;-> based in part on empire-sector-civ-threshold | |
45 | ;;->m Redistribute military using levels given by empire-ideal-mil-fcn | |
46 | ;;->p Redistribute excess population to highways for max pop growth | |
47 | ;;-> Excess is any sector so full babies will not be born. | |
48 | ;;->f Even out food on highways to highway min and leave levels | |
49 | ;;-> This is good to pump max food to all warehouses/dist pts | |
50 | ;;-> | |
51 | ;;-> | |
52 | ;;->Use \\[help-for-empire-redistribute-map] for help on redistribution. | |
53 | ;;->Use \\[help-for-empire-extract-map] for help on data extraction. | |
54 | ;;->Please use \\[describe-key] to find out more about any of the other keys." | |
55 | ;;-> empire-shell-redistribute-map) | |
56 | ||
57 | ;;-> (define-key c-mp "\C-h" 'help-for-empire-redistribute-map) | |
58 | ;;-> (define-key c-mp help-character 'help-for-empire-redistribute-map) | |
59 | ||
60 | ;;; Change Log: | |
61 | ;; | |
62 | ;; 22-Jan-1991 Lynn Slater x2048 | |
63 | ;; Last Modified: Mon Oct 1 11:43:52 1990 #3 (Lynn Slater) | |
64 | ;; documented better | |
65 | ||
66 | ;;; Code: | |
67 | ||
68 | (provide 'help-screen) | |
69 | (require 'backquote) | |
70 | ||
71 | (defmacro make-help-screen (fname help-line help-text helped-map) | |
72 | "Constructs function FNAME that when invoked shows HELP-LINE and if a help | |
73 | character is requested, shows HELP-TEXT. The user is prompted for a character | |
74 | from the HELPED-MAP and the corresponding interactive function is executed." | |
75 | (` (defun (, fname) () | |
76 | (, help-text) | |
77 | (interactive) | |
78 | (let ((line-prompt | |
79 | (substitute-command-keys (, help-line)))) | |
80 | (message line-prompt) | |
81 | (let ((char (read-char))) | |
82 | (if (or (= char ??) (= char help-char)) | |
83 | (save-window-excursion | |
84 | (switch-to-buffer-other-window "*Help*") | |
85 | (erase-buffer) | |
86 | (insert (documentation (quote (, fname)))) | |
87 | (goto-char (point-min)) | |
88 | (while (memq char (cons help-char '(?? ?\C-v ?\ ?\177 ?\M-v))) | |
89 | (if (memq char '(?\C-v ?\ )) | |
90 | (scroll-up)) | |
91 | (if (memq char '(?\177 ?\M-v)) | |
92 | (scroll-down)) | |
93 | (message "%s%s: " | |
94 | line-prompt | |
95 | (if (pos-visible-in-window-p (point-max)) | |
96 | "" " or Space to scroll")) | |
97 | (let ((cursor-in-echo-area t)) | |
98 | (setq char (read-char)))))) | |
99 | (let ((defn (cdr (assq (downcase char) (, helped-map))))) | |
100 | (if defn | |
101 | (if (keymapp defn) | |
102 | (error "sorry, this command cannot be run from the help screen. Start over.") | |
103 | (call-interactively defn)) | |
104 | (ding)))))) | |
105 | )) | |
106 | ||
107 | ;;; help-screen.el | |
108 |