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227 lines
11 KiB
EmacsLisp
227 lines
11 KiB
EmacsLisp
;;; help-macro.el --- makes command line help such as help-for-help -*- lexical-binding: t -*-
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;; Copyright (C) 1993-1994, 2001-2023 Free Software Foundation, Inc.
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;; Author: Lynn Slater <lrs@indetech.com>
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;; Maintainer: emacs-devel@gnu.org
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;; Created: Mon Oct 1 11:42:39 1990
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;; Adapted-By: ESR
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;; Package: emacs
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file supplies the macro `make-help-screen' which constructs
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;; single character dispatching with browsable help such as that
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;; provided by `help-for-help'. This can be used to make many modes
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;; easier to use; for example, the (long-since defunct) GNU Emacs
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;; Empire Tool used this for every "nested" mode map called from the
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;; main mode map.
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;; The name of this package was changed from help-screen.el to
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;; help-macro.el in order to fit in a 14-character limit.
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;;-> *********************** Example of use *********************************
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;;->(make-help-screen help-for-empire-redistribute-map
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;;-> "c:civ m:mil p:population f:food ?"
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;;-> "You have discovered the GEET redistribution commands
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;;-> From here, you can use the following options:
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;;->
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;;->c Redistribute civs from overfull sectors into connected underfull ones
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;;-> The functions typically named by empire-ideal-civ-fcn control
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;;-> based in part on empire-sector-civ-threshold
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;;->m Redistribute military using levels given by empire-ideal-mil-fcn
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;;->p Redistribute excess population to highways for max pop growth
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;;-> Excess is any sector so full babies will not be born.
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;;->f Even out food on highways to highway min and leave levels
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;;-> This is good to pump max food to all warehouses/dist pts
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;;->
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;;->
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;;->Use \\[help-for-empire-redistribute-map] for help on redistribution.
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;;->Use \\[help-for-empire-extract-map] for help on data extraction.
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;;->Please use \\[describe-key] to find out more about any of the other keys."
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;;-> empire-shell-redistribute-map)
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;;-> (define-key c-mp "\C-h" 'help-for-empire-redistribute-map)
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;;-> (define-key c-mp help-character 'help-for-empire-redistribute-map)
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;;; Code:
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(require 'backquote)
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;; This needs to be autoloaded because it is used in the
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;; make-help-screen macro. Using (bound-and-true-p three-step-help)
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;; is not an acceptable alternative, because nothing loads help-macro
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;; in a normal session, so any user customization would never be applied.
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;;;###autoload
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(defcustom three-step-help nil
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"Non-nil means give more info about Help command in three steps.
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The three steps are simple prompt, prompt with all options, and
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window listing and describing the options.
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A value of nil means skip the middle step, so that \\[help-command] \\[help-command]
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gives the window that lists the options."
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:type 'boolean
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:group 'help)
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(defmacro make-help-screen (fname help-line help-text helped-map
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&optional buffer-name)
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"Construct help-menu function name FNAME.
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When invoked, FNAME shows HELP-LINE and reads a command using HELPED-MAP.
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If the command is the help character, FNAME displays HELP-TEXT
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and continues trying to read a command using HELPED-MAP.
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If HELP-TEXT contains the sequence `%THIS-KEY%', that is replaced
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with the key sequence that invoked FNAME.
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When FNAME finally does get a command, it executes that command
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and then returns."
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(declare (indent defun))
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`(defun ,fname ()
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"Help command."
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(interactive)
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(let ((line-prompt
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(substitute-command-keys ,help-line))
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(help-buffer-under-preparation t))
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(when three-step-help
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(message "%s" line-prompt))
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(let* ((help-screen ,help-text)
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;; We bind overriding-local-map for very small
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;; sections, *excluding* where we switch buffers
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;; and where we execute the chosen help command.
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(local-map (make-sparse-keymap))
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(new-minor-mode-map-alist minor-mode-map-alist)
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(prev-frame (selected-frame))
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config new-frame key char)
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(when (string-match "%THIS-KEY%" help-screen)
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(setq help-screen
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(replace-match (help--key-description-fontified
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(substring (this-command-keys) 0 -1))
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t t help-screen)))
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(unwind-protect
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(let ((minor-mode-map-alist nil))
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(setcdr local-map ,helped-map)
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(define-key local-map [t] 'undefined)
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;; Make the scroll bar keep working normally.
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(define-key local-map [vertical-scroll-bar]
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(lookup-key global-map [vertical-scroll-bar]))
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(if three-step-help
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(progn
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(setq key (let ((overriding-local-map local-map))
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(read-key-sequence nil)))
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;; Make the HELP key translate to C-h.
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(if (lookup-key function-key-map key)
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(setq key (lookup-key function-key-map key)))
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(setq char (aref key 0)))
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(setq char ??))
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(when (or (eq char ??) (eq char help-char)
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(memq char help-event-list))
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(setq config (current-window-configuration))
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(pop-to-buffer (or ,buffer-name " *Metahelp*") nil t)
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(and (fboundp 'make-frame)
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(not (eq (window-frame)
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prev-frame))
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(setq new-frame (window-frame)
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config nil))
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(setq buffer-read-only nil)
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(let ((inhibit-read-only t))
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(erase-buffer)
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(insert (substitute-command-keys help-screen)))
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(let ((minor-mode-map-alist new-minor-mode-map-alist))
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(help-mode)
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(variable-pitch-mode)
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(setq new-minor-mode-map-alist minor-mode-map-alist))
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(goto-char (point-min))
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(while (or (memq char (append help-event-list
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(cons help-char '( ?? ?\C-v ?\s ?\177 ?\M-v ?\S-\s
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deletechar backspace vertical-scroll-bar
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home end next prior up down))))
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(eq (car-safe char) 'switch-frame)
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(equal key "\M-v"))
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(condition-case nil
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(cond
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((eq (car-safe char) 'switch-frame)
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(handle-switch-frame char))
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((memq char '(?\C-v ?\s next end))
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(scroll-up))
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((or (memq char '(?\177 ?\M-v ?\S-\s deletechar backspace prior home))
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(equal key "\M-v"))
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(scroll-down))
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((memq char '(down))
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(scroll-up 1))
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((memq char '(up))
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(scroll-down 1)))
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(error nil))
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(let ((cursor-in-echo-area t)
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(overriding-local-map local-map))
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(setq key (read-key-sequence
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(format "Type one of listed options%s: "
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(if (pos-visible-in-window-p
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(point-max))
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""
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(concat ", or "
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(help--key-description-fontified (kbd "<PageDown>"))
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"/"
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(help--key-description-fontified (kbd "<PageUp>"))
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"/"
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(help--key-description-fontified (kbd "SPC"))
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"/"
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(help--key-description-fontified (kbd "DEL"))
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" to scroll"))))
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char (aref key 0)))
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;; If this is a scroll bar command, just run it.
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(when (eq char 'vertical-scroll-bar)
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(command-execute (lookup-key local-map key) nil key))))
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;; We don't need the prompt any more.
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(message "")
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;; Mouse clicks are not part of the help feature,
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;; so reexecute them in the standard environment.
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(if (listp char)
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(setq unread-command-events
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(cons char unread-command-events)
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config nil)
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(let ((defn (lookup-key local-map key)))
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(if defn
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(progn
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(when config
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(set-window-configuration config)
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(setq config nil))
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;; Temporarily rebind `minor-mode-map-alist'
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;; to `new-minor-mode-map-alist' (Bug#10454).
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(let ((minor-mode-map-alist new-minor-mode-map-alist))
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;; `defn' must make sure that its frame is
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;; selected, so we won't iconify it below.
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(call-interactively defn))
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(when new-frame
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;; Do not iconify the selected frame.
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(unless (eq new-frame (selected-frame))
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(iconify-frame new-frame))
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(setq new-frame nil)))
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(unless (equal (key-description key) "C-g")
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(message (substitute-command-keys
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(format "No help command is bound to `\\`%s''"
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(key-description key))))
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(ding))))))
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(when config
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(set-window-configuration config))
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(when new-frame
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(iconify-frame new-frame))
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(setq minor-mode-map-alist new-minor-mode-map-alist))))))
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(provide 'help-macro)
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;;; help-macro.el ends here
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