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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 free software; you can redistribute it and/or modify
8: ;; it under the terms of the GNU General Public License as published by
9: ;; the Free Software Foundation; either version 1, or (at your option)
10: ;; any later version.
11:
12: ;; GNU Emacs is distributed in the hope that it will be useful,
13: ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14: ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: ;; GNU General Public License for more details.
16:
17: ;; You should have received a copy of the GNU General Public License
18: ;; along with GNU Emacs; see the file COPYING. If not, write to
19: ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20:
21:
22: (provide 'electric) ; zaaaaaaap
23:
24: ;; perhaps this should be in subr.el...
25: (defun shrink-window-if-larger-than-buffer (window)
26: (save-excursion
27: (set-buffer (window-buffer window))
28: (let ((w (selected-window)) ;save-window-excursion can't win
29: (buffer-file-name buffer-file-name)
30: (p (point))
31: (n 0)
32: (window-min-height 0)
33: (buffer-read-only nil)
34: (modified (buffer-modified-p)))
35: (unwind-protect
36: (progn
37: (select-window window)
38: (goto-char (point-min))
39: (while (pos-visible-in-window-p (point-max))
40: ;; defeat file locking... don't try this at home, kids!
41: (setq buffer-file-name nil)
42: (insert ?\n) (setq n (1+ n)))
43: (if (> n 0) (shrink-window (1- n))))
44: (delete-region (point-min) (point))
45: (set-buffer-modified-p modified)
46: (goto-char p)
47: (select-window w)))))
48:
49:
50: ;; This loop is the guts for non-standard modes which retain control
51: ;; until some event occurs. It is a `do-forever', the only way out is to
52: ;; throw. It assumes that you have set up the keymap, window, and
53: ;; everything else: all it does is read commands and execute them -
54: ;; providing error messages should one occur (if there is no loop
55: ;; function - which see). The required argument is a tag which should
56: ;; expect a value of nil if the user decides to punt. The
57: ;; second argument is a prompt string (defaults to "->"). Given third
58: ;; argument non-nil, it INHIBITS quitting unless the user types C-g at
59: ;; toplevel. This is so user can do things like C-u C-g and not get
60: ;; thrown out. Fourth argument, if non-nil, should be a function of two
61: ;; arguments which is called after every command is executed. The fifth
62: ;; argument, if provided, is the state variable for the function. If the
63: ;; loop-function gets an error, the loop will abort WITHOUT throwing
64: ;; (moral: use unwind-protect around call to this function for any
65: ;; critical stuff). The second argument for the loop function is the
66: ;; conditions for any error that occurred or nil if none.
67:
68: (defun Electric-command-loop (return-tag
69: &optional prompt inhibit-quit
70: loop-function loop-state)
71: (if (not prompt) (setq prompt "->"))
72: (let (cmd (err nil))
73: (while t
74: (setq cmd (read-key-sequence (if (stringp prompt)
75: prompt (funcall prompt))))
76: (setq last-command-char (aref cmd (1- (length cmd)))
77: this-command (key-binding cmd)
78: cmd this-command)
79: (if (or (prog1 quit-flag (setq quit-flag nil))
80: (= last-input-char ?\C-g))
81: (progn (setq unread-command-char -1
82: prefix-arg nil)
83: ;; If it wasn't cancelling a prefix character, then quit.
84: (if (or (= (length (this-command-keys)) 1)
85: (not inhibit-quit)) ; safety
86: (progn (ding)
87: (message "Quit")
88: (throw return-tag nil))
89: (setq cmd nil))))
90: (setq current-prefix-arg prefix-arg)
91: (if cmd
92: (condition-case conditions
93: (progn (command-execute cmd)
94: (if (or (prog1 quit-flag (setq quit-flag nil))
95: (= last-input-char ?\C-g))
96: (progn (setq unread-command-char -1)
97: (if (not inhibit-quit)
98: (progn (ding)
99: (message "Quit")
100: (throw return-tag nil))
101: (ding)))))
102: (buffer-read-only (if loop-function
103: (setq err conditions)
104: (ding)
105: (message "Buffer is read-only")
106: (sit-for 2)))
107: (beginning-of-buffer (if loop-function
108: (setq err conditions)
109: (ding)
110: (message "Beginning of Buffer")
111: (sit-for 2)))
112: (end-of-buffer (if loop-function
113: (setq err conditions)
114: (ding)
115: (message "End of Buffer")
116: (sit-for 2)))
117: (error (if loop-function
118: (setq err conditions)
119: (ding)
120: (message "Error: %s"
121: (if (eq (car conditions) 'error)
122: (car (cdr conditions))
123: (prin1-to-string conditions)))
124: (sit-for 2))))
125: (ding))
126: (if loop-function (funcall loop-function loop-state err))))
127: (ding)
128: (throw return-tag nil))
129:
130: ;; This function is like pop-to-buffer, sort of.
131: ;; The algorithm is
132: ;; If there is a window displaying buffer
133: ;; Select it
134: ;; Else if there is only one window
135: ;; Split it, selecting the window on the bottom with height being
136: ;; the lesser of max-height (if non-nil) and the number of lines in
137: ;; the buffer to be displayed subject to window-min-height constraint.
138: ;; Else
139: ;; Switch to buffer in the current window.
140: ;;
141: ;; Then if max-height is nil, and not all of the lines in the buffer
142: ;; are displayed, grab the whole screen.
143: ;;
144: ;; Returns selected window on buffer positioned at point-min.
145:
146: (defun Electric-pop-up-window (buffer &optional max-height)
147: (let* ((win (or (get-buffer-window buffer) (selected-window)))
148: (buf (get-buffer buffer))
149: (one-window (one-window-p t))
150: (pop-up-windows t)
151: (target-height)
152: (lines))
153: (if (not buf)
154: (error "Buffer %s does not exist" buffer)
155: (save-excursion
156: (set-buffer buf)
157: (setq lines (count-lines (point-min) (point-max)))
158: (setq target-height
159: (min (max (if max-height (min max-height (1+ lines)) (1+ lines))
160: window-min-height)
161: (save-window-excursion
162: (delete-other-windows)
163: (1- (window-height (selected-window)))))))
164: (cond ((and (eq (window-buffer win) buf))
165: (select-window win))
166: (one-window
167: (goto-char (window-start win))
168: (pop-to-buffer buffer)
169: (setq win (selected-window))
170: (enlarge-window (- target-height (window-height win))))
171: (t
172: (switch-to-buffer buf)))
173: (if (and (not max-height)
174: (> target-height (window-height (selected-window))))
175: (progn (goto-char (window-start win))
176: (enlarge-window (- target-height (window-height win)))))
177: (goto-char (point-min))
178: win)))
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