1;;; calc-trail.el --- functions for manipulating the Calc "trail"
2
3;; Copyright (C) 1990, 1991, 1992, 1993, 2001, 2002, 2003, 2004,
4;;   2005, 2006, 2007 Free Software Foundation, Inc.
5
6;; Author: David Gillespie <daveg@synaptics.com>
7;; Maintainer: Jay Belanger <jay.p.belanger@gmail.com>
8
9;; This file is part of GNU Emacs.
10
11;; GNU Emacs is free software; you can redistribute it and/or modify
12;; it under the terms of the GNU General Public License as published by
13;; the Free Software Foundation; either version 2, or (at your option)
14;; any later version.
15
16;; GNU Emacs is distributed in the hope that it will be useful,
17;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19;; GNU General Public License for more details.
20
21;; You should have received a copy of the GNU General Public License
22;; along with GNU Emacs; see the file COPYING.  If not, write to the
23;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24;; Boston, MA 02110-1301, USA.
25
26;;; Commentary:
27
28;;; Code:
29
30;; This file is autoloaded from calc-ext.el.
31
32(require 'calc-ext)
33(require 'calc-macs)
34
35;;; Trail commands.
36
37(defun calc-trail-in ()
38  (interactive)
39  (let ((win (get-buffer-window (calc-trail-display t))))
40    (and win (select-window win))))
41
42(defun calc-trail-out ()
43  (interactive)
44  (calc-select-buffer)
45  (let ((win (get-buffer-window (current-buffer))))
46    (if win
47	(progn
48	  (select-window win)
49	  (calc-align-stack-window))
50      (calc))))
51
52(defun calc-trail-next (n)
53  (interactive "p")
54  (calc-with-trail-buffer
55   (forward-line n)
56   (calc-trail-here)))
57
58(defun calc-trail-previous (n)
59  (interactive "p")
60  (calc-with-trail-buffer
61   (forward-line (- n))
62   (calc-trail-here)))
63
64(defun calc-trail-first (n)
65  (interactive "p")
66  (calc-with-trail-buffer
67   (goto-char (point-min))
68   (forward-line n)
69   (calc-trail-here)))
70
71(defun calc-trail-last (n)
72  (interactive "p")
73  (calc-with-trail-buffer
74   (goto-char (point-max))
75   (forward-line (- n))
76   (calc-trail-here)))
77
78(defun calc-trail-scroll-left (n)
79  (interactive "P")
80  (let ((curwin (selected-window)))
81    (calc-with-trail-buffer
82     (unwind-protect
83	 (progn
84	   (select-window (get-buffer-window (current-buffer)))
85	   (calc-scroll-left n))
86       (select-window curwin)))))
87
88(defun calc-trail-scroll-right (n)
89  (interactive "P")
90  (let ((curwin (selected-window)))
91    (calc-with-trail-buffer
92     (unwind-protect
93	 (progn
94	   (select-window (get-buffer-window (current-buffer)))
95	   (calc-scroll-right n))
96       (select-window curwin)))))
97
98(defun calc-trail-forward (n)
99  (interactive "p")
100  (calc-with-trail-buffer
101   (forward-line (* n (1- (window-height))))
102   (calc-trail-here)))
103
104(defun calc-trail-backward (n)
105  (interactive "p")
106  (calc-with-trail-buffer
107   (forward-line (- (* n (1- (window-height)))))
108   (calc-trail-here)))
109
110(defun calc-trail-isearch-forward ()
111  (interactive)
112  (calc-with-trail-buffer
113   (save-window-excursion
114     (select-window (get-buffer-window (current-buffer)))
115     (let ((search-exit-char ?\r))
116       (isearch-forward)))
117   (calc-trail-here)))
118
119(defun calc-trail-isearch-backward ()
120  (interactive)
121  (calc-with-trail-buffer
122   (save-window-excursion
123     (select-window (get-buffer-window (current-buffer)))
124     (let ((search-exit-char ?\r))
125       (isearch-backward)))
126   (calc-trail-here)))
127
128(defun calc-trail-yank (arg)
129  (interactive "P")
130  (calc-wrapper
131   (or arg (calc-set-command-flag 'hold-trail))
132   (calc-enter-result 0 "yank"
133		      (calc-with-trail-buffer
134		       (if arg
135			   (forward-line (- (prefix-numeric-value arg))))
136		       (if (or (looking-at "Emacs Calc")
137			       (looking-at "----")
138			       (looking-at " ? ? ?[^ \n]* *$")
139			       (looking-at "..?.?$"))
140			   (error "Can't yank that line"))
141		       (if (looking-at ".*, \\.\\.\\., ")
142			   (error "Can't yank (vector was abbreviated)"))
143		       (forward-char 4)
144		       (search-forward " ")
145		       (let* ((next (save-excursion (forward-line 1) (point)))
146			      (str (buffer-substring (point) (1- next)))
147			      (val (save-excursion
148				     (set-buffer save-buf)
149				     (math-read-plain-expr str))))
150			 (if (eq (car-safe val) 'error)
151			     (error "Can't yank that line: %s" (nth 2 val))
152			   val))))))
153
154(defun calc-trail-marker (str)
155  (interactive "sText to insert in trail: ")
156  (calc-with-trail-buffer
157   (forward-line 1)
158   (let ((buffer-read-only nil))
159     (insert "---- " str "\n"))
160   (forward-line -1)
161   (calc-trail-here)))
162
163(defun calc-trail-kill (n)
164  (interactive "p")
165  (calc-with-trail-buffer
166   (let ((buffer-read-only nil))
167     (save-restriction
168       (narrow-to-region   ; don't delete "Emacs Trail" header
169	(save-excursion
170	  (goto-char (point-min))
171	  (forward-line 1)
172	  (point))
173	(point-max))
174       (kill-line n)))
175   (calc-trail-here)))
176
177(provide 'calc-trail)
178
179;;; arch-tag: 59b76655-d882-4aab-a3ee-b83870e530d0
180;;; calc-trail.el ends here
181