commit 5857c6138296743b464d8a748dc40400143bdab4
Author: Tom Willemsen <tom@ryuslash.org>
Date:   Mon Sep 17 18:32:41 2012 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+*.elc
diff --git a/bw.el b/bw.el
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+;;; bw.el --- Show stuff in a bottom window
+
+;; Copyright (C) 2012  Tom Willemsen
+
+;; Author: Tom Willemsen <slash@drd>
+;; Keywords: convenience
+;; Version: 0
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU 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 General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Show stuff in a bottom window.
+
+;;; Code:
+
+(defvar bw-last-shown-buffer nil
+  "The last buffer shown by bw.")
+
+(defadvice quit-window (around delete-window-perhaps activate)
+  "Delete the bottom window if necessary."
+  (let* ((win (window-normalize-window (ad-get-arg 2)))
+         (delp (and (window-parameter win 'bw-bottom)
+                    (string-match-p "^\\*.*\\*$"
+                                    (buffer-name (window-buffer win))))))
+    ad-do-it
+    (when delp
+      (delete-window win))))
+
+(defun bw-create-window ()
+  "Create the bottom window."
+  (let ((win (split-window (frame-root-window) -20 'below)))
+    (set-window-parameter win 'bw-bottom t)
+    ;; Don't allow splitting of the bottom window.
+    (set-window-parameter win 'split-window (lambda (window size side) nil))
+    ;; Don't allow deleting other windows in the bottom window.
+    (set-window-parameter win 'delete-other-windows (lambda (window) nil))
+    win))
+
+(defun bw-get-window ()
+  "Try to get the bottom window."
+  (let (win)
+    (mapc
+     (lambda (w)
+       (when (window-parameter w 'bw-bottom)
+         (setq win w)))
+     (window-list))
+    win))
+
+(defun bw-display-in-bottom-window (buffer alist)
+  "Show BUFFER in the bottom window, discard ALIST."
+  (let ((win (or (bw-get-window) (bw-create-window))))
+    (set-window-buffer win buffer)
+    (setq bw-last-shown-buffer buffer)
+    (local-set-key (kbd "C-c C-q") 'delete-window)
+    win))
+
+(add-to-list 'display-buffer-alist
+             '("^\\*.*\\*$" . ((bw-display-in-bottom-window . nil))))
+(add-to-list 'window-persistent-parameters (cons 'bw-bottom t))
+
+(defun bw-find-appropriate-buffer ()
+  "Find an appropriate buffer for bw."
+  (let ((buffers (buffer-list))
+        tmp-buffer buffer)
+    (while (and (not buffer) buffers)
+      (setq tmp-buffer (car buffers))
+      (when (string-match-p "^\\*.*\\*$" (buffer-name tmp-buffer))
+        (setq buffer tmp-buffer))
+      (setq buffers (cdr buffers)))
+    (unless buffer
+      (setq buffer "*scratch*"))
+    buffer))
+
+(defun bw-toggle-bottom-window ()
+  "Either show or delete the bottom window."
+  (interactive)
+  (let ((win (bw-get-window)))
+    (if win
+        (delete-window win)
+      (setq win (bw-create-window))
+      (bw-display-in-bottom-window
+       (or bw-last-shown-buffer (bw-find-appropriate-buffer)) nil)
+      (select-window win))))
+
+(global-set-key (kbd "<f11>") 'bw-toggle-bottom-window)
+
+(provide 'bw)
+;;; bw.el ends here