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[project @ 1993-08-08 01:13:40 by jwe] Initial revision
author jwe
date Sun, 08 Aug 1993 01:13:40 +0000
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children b6b4d8c513fe
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0:22412e3a4641 1:78fd87e624cb
1 // pager.cc -*- C++ -*-
2 /*
3
4 Copyright (C) 1992, 1993 John W. Eaton
5
6 This file is part of Octave.
7
8 Octave is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any
11 later version.
12
13 Octave is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with Octave; see the file COPYING. If not, write to the Free
20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
21
22 */
23
24 #ifdef __GNUG__
25 #pragma implementation
26 #endif
27
28 #include <iostream.h>
29 #include <strstream.h>
30 #include <stdlib.h>
31
32 #include "procstream.h"
33
34 #include "user-prefs.h"
35 #include "input.h"
36 #include "pager.h"
37
38 // Where we stash output headed for the screen.
39 static ostrstream *pager_buf;
40
41 static int
42 line_count (char *s)
43 {
44 int count = 0;
45 if (s != (char *) NULL)
46 {
47 char c;
48 while ((c = *s++) != '\0')
49 if (c == '\n')
50 count++;
51 }
52 return count;
53 }
54
55 /*
56 * For now, use the variables from readline. It already handles
57 * SIGWINCH, so these values have a good chance of being correct even
58 * if the window changes size (they will be wrong if, for example, the
59 * luser changes the window size while the pager is running, and the
60 * signal is handled by the pager instead of us.
61 */
62 int
63 terminal_columns (void)
64 {
65 extern int screenwidth;
66 return screenwidth > 0 ? screenwidth : 80;
67 }
68
69 int
70 terminal_rows (void)
71 {
72 extern int screenheight;
73 return screenheight > 0 ? screenheight : 24;
74 }
75
76 void
77 initialize_pager (void)
78 {
79 delete pager_buf;
80 pager_buf = new ostrstream ();
81 }
82
83 void
84 maybe_page_output (ostrstream& msg_buf)
85 {
86 msg_buf << ends;
87
88 char *message = msg_buf.str ();
89
90 if (interactive
91 && user_pref.page_screen_output
92 && user_pref.pager_binary != (char *) NULL)
93 {
94 *pager_buf << message;
95 delete [] message;
96 }
97 else
98 {
99 cout << message;
100 cout.flush ();
101 delete [] message;
102 }
103 }
104
105 void
106 flush_output_to_pager (void)
107 {
108 *pager_buf << ends;
109
110 char *message = pager_buf->str ();
111
112 if (message == (char *) NULL || *message == '\0')
113 {
114 delete [] message;
115 initialize_pager ();
116 return;
117 }
118
119 int nlines = line_count (message);
120
121 if (nlines > terminal_rows () - 2)
122 {
123 char *pgr = user_pref.pager_binary;
124 if (pgr != (char *) NULL)
125 {
126 oprocstream pager_stream (pgr);
127 if (pager_stream)
128 {
129 pager_stream << message;
130 pager_stream.flush ();
131
132 delete [] message;
133 initialize_pager ();
134 return;
135 }
136 }
137 }
138
139 cout << message;
140 cout.flush ();
141 delete [] message;
142 initialize_pager ();
143 }
144
145 /*
146 ;;; Local Variables: ***
147 ;;; mode: C++ ***
148 ;;; page-delimiter: "^/\\*" ***
149 ;;; End: ***
150 */