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1.1 root 1: ;; electric -- Window maker and Command loop for `electric' modes.
2: ;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
3: ;; Principal author K. Shane Hartman
4:
5: ;; This file is part of GNU Emacs.
6:
7: ;; GNU Emacs is distributed in the hope that it will be useful,
8: ;; but WITHOUT ANY WARRANTY. No author or distributor
9: ;; accepts responsibility to anyone for the consequences of using it
10: ;; or for whether it serves any particular purpose or works at all,
11: ;; unless he says so in writing. Refer to the GNU Emacs General Public
12: ;; License for full details.
13:
14: ;; Everyone is granted permission to copy, modify and redistribute
15: ;; GNU Emacs, but only under the conditions described in the
16: ;; GNU Emacs General Public License. A copy of this license is
17: ;; supposed to have been given to you along with GNU Emacs so you
18: ;; can know your rights and responsibilities. It should be in a
19: ;; file named COPYING. Among other things, the copyright notice
20: ;; and this notice must be preserved on all copies.
21:
22:
23: (provide 'electric) ; zaaaaaaap
24:
25: ;; perhaps this should be in subr.el...
26: (defun shrink-window-if-larger-than-buffer (window)
27: (save-excursion
28: (set-buffer (window-buffer window))
29: (let ((w (selected-window)) ;save-window-excursion can't win
30: (buffer-file-name buffer-file-name)
31: (p (point))
32: (n 0)
33: (window-min-height 0)
34: (buffer-read-only nil)
35: (modified (buffer-modified-p)))
36: (unwind-protect
37: (progn
38: (select-window window)
39: (goto-char (point-min))
40: (while (pos-visible-in-window-p (point-max))
41: ;; defeat file locking... don't try this at home, kids!
42: (setq buffer-file-name nil)
43: (insert ?\n) (setq n (1+ n)))
44: (if (> n 0) (shrink-window (1- n))))
45: (delete-region (point-min) (point))
46: (set-buffer-modified-p modified)
47: (goto-char p)
48: (select-window w)))))
49:
50:
51: ;; This loop is the guts for non-standard modes which retain control
52: ;; until some event occurs. It is a `do-forever', the only way out is to
53: ;; throw. It assumes that you have set up the keymap, window, and
54: ;; everything else: all it does is read commands and execute them -
55: ;; providing error messages should one occur (if there is no loop
56: ;; function - which see). The required argument is a tag which should
57: ;; expect a value of nil if the user decides to punt. The
58: ;; second argument is a prompt string (defaults to "->"). Given third
59: ;; argument non-nil, it INHIBITS quitting unless the user types C-g at
60: ;; toplevel. This is so user can do things like C-u C-g and not get
61: ;; thrown out. Fourth argument, if non-nil, should be a function of two
62: ;; arguments which is called after every command is executed. The fifth
63: ;; argument, if provided, is the state variable for the function. If the
64: ;; loop-function gets an error, the loop will abort WITHOUT throwing
65: ;; (moral: use unwind-protect around call to this function for any
66: ;; critical stuff). The second argument for the loop function is the
67: ;; conditions for any error that occurred or nil if none.
68:
69: (defun Electric-command-loop (return-tag
70: &optional prompt inhibit-quit
71: loop-function loop-state)
72: (if (not prompt) (setq prompt "->"))
73: (let (cmd (err nil))
74: (while t
75: (setq cmd (read-key-sequence (if (stringp prompt)
76: prompt (funcall prompt))))
77: (setq last-command-char (aref cmd (1- (length cmd)))
78: this-command (key-binding cmd)
79: cmd this-command)
80: (if (or (prog1 quit-flag (setq quit-flag nil))
81: (= last-input-char ?\C-g))
82: (progn (setq unread-command-char -1
83: prefix-arg nil)
84: ;; If it wasn't cancelling a prefix character, then quit.
85: (if (or (= (length (this-command-keys)) 1)
86: (not inhibit-quit)) ; safety
87: (progn (ding)
88: (message "Quit")
89: (throw return-tag nil))
90: (setq cmd nil))))
91: (setq current-prefix-arg prefix-arg)
92: (if cmd
93: (condition-case conditions
94: (progn (command-execute cmd)
95: (if (or (prog1 quit-flag (setq quit-flag nil))
96: (= last-input-char ?\C-g))
97: (progn (setq unread-command-char -1)
98: (if (not inhibit-quit)
99: (progn (ding)
100: (message "Quit")
101: (throw return-tag nil))
102: (ding)))))
103: (buffer-read-only (if loop-function
104: (setq err conditions)
105: (ding)
106: (message "Buffer is read-only")
107: (sit-for 2)))
108: (beginning-of-buffer (if loop-function
109: (setq err conditions)
110: (ding)
111: (message "Beginning of Buffer")
112: (sit-for 2)))
113: (end-of-buffer (if loop-function
114: (setq err conditions)
115: (ding)
116: (message "End of Buffer")
117: (sit-for 2)))
118: (error (if loop-function
119: (setq err conditions)
120: (ding)
121: (message "Error: %s"
122: (if (eq (car conditions) 'error)
123: (car (cdr conditions))
124: (prin1-to-string conditions)))
125: (sit-for 2))))
126: (ding))
127: (if loop-function (funcall loop-function loop-state err))))
128: (ding)
129: (throw return-tag nil))
130:
131: ;; This function is like pop-to-buffer, sort of.
132: ;; The algorithm is
133: ;; If there is a window displaying buffer
134: ;; Select it
135: ;; Else if there is only one window
136: ;; Split it, selecting the window on the bottom with height being
137: ;; the lesser of max-height (if non-nil) and the number of lines in
138: ;; the buffer to be displayed subject to window-min-height constraint.
139: ;; Else
140: ;; Switch to buffer in the current window.
141: ;;
142: ;; Then if max-height is nil, and not all of the lines in the buffer
143: ;; are displayed, grab the whole screen.
144: ;;
145: ;; Returns selected window on buffer positioned at point-min.
146:
147: (defun Electric-pop-up-window (buffer &optional max-height)
148: (let* ((win (or (get-buffer-window buffer) (selected-window)))
149: (buf (get-buffer buffer))
150: (one-window (one-window-p t))
151: (pop-up-windows t)
152: (target-height)
153: (lines))
154: (if (not buf)
155: (error "Buffer %s does not exist" buffer)
156: (save-excursion
157: (set-buffer buf)
158: (setq lines (count-lines (point-min) (point-max)))
159: (setq target-height
160: (min (max (if max-height (min max-height (1+ lines)) (1+ lines))
161: window-min-height)
162: (save-window-excursion
163: (delete-other-windows)
164: (1- (window-height (selected-window)))))))
165: (cond ((and (eq (window-buffer win) buf))
166: (select-window win))
167: (one-window
168: (goto-char (window-start win))
169: (pop-to-buffer buffer)
170: (setq win (selected-window))
171: (enlarge-window (- target-height (window-height win))))
172: (t
173: (switch-to-buffer buf)))
174: (if (and (not max-height)
175: (> target-height (window-height (selected-window))))
176: (progn (goto-char (window-start win))
177: (enlarge-window (- target-height (window-height win)))))
178: (goto-char (point-min))
179: win)))
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