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1 // pager.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #include <iostream.h> |
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29 #include <strstream.h> |
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30 #include <stdlib.h> |
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31 |
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32 #include "procstream.h" |
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33 |
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34 #include "user-prefs.h" |
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35 #include "input.h" |
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36 #include "pager.h" |
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37 |
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38 // Where we stash output headed for the screen. |
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39 static ostrstream *pager_buf = 0; |
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40 |
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41 static int |
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42 line_count (char *s) |
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43 { |
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44 int count = 0; |
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45 if (s) |
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46 { |
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47 char c; |
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48 while ((c = *s++) != '\0') |
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49 if (c == '\n') |
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50 count++; |
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51 } |
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52 return count; |
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53 } |
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54 |
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55 /* |
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56 * For now, use the variables from readline. It already handles |
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57 * SIGWINCH, so these values have a good chance of being correct even |
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58 * if the window changes size (they will be wrong if, for example, the |
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59 * luser changes the window size while the pager is running, and the |
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60 * signal is handled by the pager instead of us. |
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61 */ |
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62 int |
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63 terminal_columns (void) |
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64 { |
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65 extern int screenwidth; |
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66 return screenwidth > 0 ? screenwidth : 80; |
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67 } |
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68 |
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69 int |
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70 terminal_rows (void) |
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71 { |
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72 extern int screenheight; |
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73 return screenheight > 0 ? screenheight : 24; |
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74 } |
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75 |
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76 void |
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77 initialize_pager (void) |
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78 { |
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79 delete pager_buf; |
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80 pager_buf = new ostrstream (); |
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81 } |
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82 |
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83 void |
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84 maybe_page_output (ostrstream& msg_buf) |
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85 { |
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86 msg_buf << ends; |
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87 |
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88 char *message = msg_buf.str (); |
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89 |
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90 if (interactive |
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91 && user_pref.page_screen_output |
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92 && user_pref.pager_binary) |
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93 { |
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94 *pager_buf << message; |
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95 delete [] message; |
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96 } |
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97 else |
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98 { |
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99 cout << message; |
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100 cout.flush (); |
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101 delete [] message; |
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102 } |
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103 } |
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104 |
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105 void |
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106 flush_output_to_pager (void) |
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107 { |
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108 *pager_buf << ends; |
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109 |
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110 char *message = pager_buf->str (); |
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111 |
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112 if (! message || ! *message) |
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113 { |
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114 delete [] message; |
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115 initialize_pager (); |
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116 return; |
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117 } |
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118 |
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119 int nlines = line_count (message); |
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120 |
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121 if (nlines > terminal_rows () - 2) |
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122 { |
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123 char *pgr = user_pref.pager_binary; |
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124 if (pgr) |
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125 { |
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126 oprocstream pager_stream (pgr); |
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127 if (pager_stream) |
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128 { |
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129 pager_stream << message; |
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130 pager_stream.flush (); |
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131 |
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132 delete [] message; |
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133 initialize_pager (); |
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134 return; |
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135 } |
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136 } |
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137 } |
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138 |
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139 cout << message; |
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140 cout.flush (); |
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141 delete [] message; |
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142 initialize_pager (); |
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143 } |
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144 |
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145 /* |
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146 ;;; Local Variables: *** |
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147 ;;; mode: C++ *** |
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148 ;;; page-delimiter: "^/\\*" *** |
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149 ;;; End: *** |
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150 */ |
