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(three-step-help): New option.

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(make-help-screen): Implement that option.
Handle delete function key like DEL.
Don't include the option list in the prompt when displaying
a full window of options.
This commit is contained in:
Richard M. Stallman 1994-01-26 20:12:33 +00:00
parent 5ed1243c2f
commit d189e34689
1 changed files with 21 additions and 10 deletions
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31
lisp/help-macro.el
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@ -71,6 +71,14 @@
(provide 'help-macro)
(require 'backquote)
;;;###autoload
(defvar three-step-help nil
"*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.")
(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.
@ -83,7 +91,8 @@ and then returns."
(interactive)
(let ((line-prompt
(substitute-command-keys (, help-line))))
(message line-prompt)
(if three-step-help
(message line-prompt))
(let* ((overriding-local-map (make-sparse-keymap))
(minor-mode-map-alist nil)
config key char help-screen)
@ -92,8 +101,10 @@ and then returns."
(setcdr overriding-local-map (, helped-map))
(define-key overriding-local-map [t] 'undefined)
(setq help-screen (documentation (quote (, fname))))
(setq key (read-key-sequence nil))
(setq char (aref key 0))
(if three-step-help
(setq key (read-key-sequence nil)
char (aref key 0))
(setq char ??))
(if (or (eq char ??) (eq char help-char))
(progn
(setq config (current-window-configuration))
@ -101,23 +112,23 @@ and then returns."
(erase-buffer)
(insert help-screen)
(goto-char (point-min))
(while (or (memq char (cons help-char '(?? ?\C-v ?\ ?\177 ?\M-v)))
(while (or (memq char (cons help-char '(?? ?\C-v ?\ ?\177 delete ?\M-v)))
(equal key "\M-v"))
(setq list (cons key list))
(condition-case nil
(progn
(if (memq char '(?\C-v ?\ ))
(scroll-up))
(if (or (memq char '(?\177 ?\M-v))
(if (or (memq char '(?\177 ?\M-v delete))
(equal key "\M-v"))
(scroll-down)))
(error nil))
(message "%s%s: "
line-prompt
(if (pos-visible-in-window-p (point-max))
"" " or Space to scroll"))
(let ((cursor-in-echo-area t))
(setq key (read-key-sequence nil)
(setq key (read-key-sequence
(format "Type one of the options listed%s: "
(if (pos-visible-in-window-p
(point-max))
"" " or Space to scroll")))
char (aref key 0))))
(setq list (cons key list))))
;; Mouse clicks are not part of the help feature,