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(make-help-screen): Use read-key-sequence.

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Temporarily switch keymaps.
This commit is contained in:
Richard M. Stallman 1993-12-31 03:45:08 +00:00
parent ef586bbd32
commit 657a790941
1 changed files with 44 additions and 26 deletions
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56
lisp/help-macro.el
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@ -72,52 +72,70 @@
(require 'backquote)
(defmacro make-help-screen (fname help-line help-text helped-map)
"Constructs function FNAME that when invoked shows HELP-LINE and if a help
character is requested, shows HELP-TEXT. The user is prompted for a character
from the HELPED-MAP and the corresponding interactive function is executed."
"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 is requested, 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)
(let ((line-prompt
(substitute-command-keys (, help-line))))
(substitute-command-keys (, help-line)))
(help-screen (documentation (quote (, fname)))))
(message line-prompt)
(let ((char (read-event))
config)
(let ((old-local-map (current-local-map))
(old-global-map (current-global-map))
(minor-mode-map-alist nil)
config key char)
(unwind-protect
(progn
(use-global-map (, helped-map))
(use-local-map nil)
(setq key (read-key-sequence nil))
(setq char (aref key 0))
(if (or (eq char ??) (eq char help-char))
(progn
(setq config (current-window-configuration))
(switch-to-buffer-other-window "*Help*")
(erase-buffer)
(insert (documentation (quote (, fname))))
(insert help-screen)
(goto-char (point-min))
(while (memq char (cons help-char '(?? ?\C-v ?\ ?\177 ?\M-v)))
(condition-case nil
(progn
(if (memq char '(?\C-v ?\ ))
(scroll-up))
(if (memq char '(?\177 ?\M-v))
(scroll-down))
(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 char (read-event))))))
(let ((defn (cdr (assq (if (integerp char) (downcase char) char) (, helped-map)))))
(if defn
(if (keymapp defn)
(error "sorry, this command cannot be run from the help screen. Start over.")
(if config
(progn
(set-window-configuration config)
(setq config nil)))
(call-interactively defn))
(setq key (read-key-sequence nil)
char (aref key 0))))))
;; Mouse clicks are not part of the help feature,
;; so reexecute them in the standard environment.
(if (listp char)
(setq unread-command-events
(cons char unread-command-events)
config nil)
(let ((defn (key-binding key)))
(if defn
(progn
(if config
(progn
(set-window-configuration config)
(setq config nil)))
(use-local-map old-local-map)
(use-global-map old-global-map)
(call-interactively defn))
(ding)))))
(use-local-map old-local-map)
(use-global-map old-global-map)
(if config
(set-window-configuration config))))))
))