Extracted echo-keys from ~/.emacs

Pascal J. Bourguignon [2014-06-04 23:36]
Extracted echo-keys from ~/.emacs
Filename
pjb-echo-keys.el
pjb-loader.el
diff --git a/pjb-echo-keys.el b/pjb-echo-keys.el
new file mode 100644
index 0000000..f96b59a
--- /dev/null
+++ b/pjb-echo-keys.el
@@ -0,0 +1,88 @@
+;;;; -*- mode:emacs-lisp;coding:utf-8 -*-
+;;;;**************************************************************************
+;;;;FILE:               pjb-echo-keys.el
+;;;;LANGUAGE:           emacs lisp
+;;;;SYSTEM:             POSIX
+;;;;USER-INTERFACE:     NONE
+;;;;DESCRIPTION
+;;;;
+;;;;    Echo emacs key chords as they are typed.
+;;;;
+;;;;AUTHORS
+;;;;    <PJB> Pascal J. Bourguignon <pjb@informatimago.com>
+;;;;MODIFICATIONS
+;;;;    2014-06-05 <PJB> Extracted from ~/.emacs.
+;;;;BUGS
+;;;;LEGAL
+;;;;    AGPL3
+;;;;
+;;;;    Copyright Pascal J. Bourguignon 2014 - 2014
+;;;;
+;;;;    This program is free software: you can redistribute it and/or modify
+;;;;    it under the terms of the GNU Affero General Public License as published by
+;;;;    the Free Software Foundation, either version 3 of the License, or
+;;;;    (at your option) any later version.
+;;;;
+;;;;    This program 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 Affero General Public License for more details.
+;;;;
+;;;;    You should have received a copy of the GNU Affero General Public License
+;;;;    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;;;;**************************************************************************
+(require 'cl)
+
+(defvar *echo-keys-last* nil "Last command processed by `echo-keys'.")
+(defvar *echo-key-width*  40 "Default width of the *echo-keys* window.")
+
+
+(defun echo-keys ()
+  (let ((deactivate-mark deactivate-mark)
+        (keys            (this-command-keys)))
+    (when keys
+      (save-excursion
+       (with-current-buffer (get-buffer-create "*echo-key*")
+         (goto-char (point-max))
+         (if (eql this-command 'self-insert-command)
+             (let ((desc (key-description keys)))
+               (if (= 1 (length desc))
+                   (insert desc)
+                   (insert " " desc " ")))
+             (insert (if (eq 'self-insert-command *echo-keys-last*)
+                         "\n"
+                         "")
+                     (format "%-12s %s\n"
+                             (key-description keys)
+                             this-command)))
+         (setf *echo-keys-last* this-command)
+         (dolist (window (window-list))
+           (when (eq (window-buffer window) (current-buffer))
+             (with-selected-window window
+               ;; We need to use both to get the effect.
+               (set-window-point window (point))
+               (end-of-buffer)))))))))
+
+
+(defun toggle-echo-keys ()
+  "Toggle displaying the *echo-key* buffer."
+  (interactive)
+  (if (member 'echo-keys (default-value 'pre-command-hook))
+      (let ((echo-buffer (get-buffer "*echo-key*")))
+        (remove-hook 'pre-command-hook 'echo-keys)
+        (dolist (window (window-list))
+          (when (eq (window-buffer window) echo-buffer)
+            (delete-window window))))
+      (progn
+        (add-hook 'pre-command-hook 'echo-keys)
+        (delete-other-windows)
+        (split-window nil (- (window-width) *echo-key-width*) t)
+        (other-window 1)
+        (switch-to-buffer (get-buffer-create "*echo-key*"))
+        (toggle-truncate-lines +1)
+        (set-window-dedicated-p (selected-window) t)
+        (other-window 1))))
+
+
+(provide 'pjb-echo-keys)
+;;;; THE END ;;;;
diff --git a/pjb-loader.el b/pjb-loader.el
index 66b08b4..d8ee837 100644
--- a/pjb-loader.el
+++ b/pjb-loader.el
@@ -60,6 +60,7 @@
         "pjb-class.el"
         "pjb-dodo.el"
         "pjb-emacs.el"
+        "pjb-echo-keys.el"
         "pjb-erc.el"
         "pjb-erc-filter.el"
         "pjb-erc-speak.el"
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