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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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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 <signal.h> |
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29 #include <iostream.h> |
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30 #include <strstream.h> |
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31 #include <fstream.h> |
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32 #include <stdlib.h> |
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33 |
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34 #include "procstream.h" |
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35 |
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36 #include "sighandlers.h" |
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37 #include "user-prefs.h" |
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38 #include "oct-obj.h" |
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39 #include "error.h" |
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40 #include "defun.h" |
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41 #include "input.h" |
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42 #include "pager.h" |
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43 #include "utils.h" |
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44 #include "help.h" |
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45 |
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46 // Where we stash output headed for the screen. |
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47 static ostrstream *pager_buf = 0; |
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48 |
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49 // Nonzero means we write to the diary file. |
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50 static int write_to_diary_file = 0; |
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51 |
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52 // The name of the current diary file. |
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53 static char *diary_file = "diary"; |
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54 |
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55 // The diary file. |
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56 static ofstream diary_stream; |
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57 |
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58 static int |
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59 line_count (char *s) |
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60 { |
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61 int count = 0; |
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62 if (s) |
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63 { |
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64 char c; |
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65 while ((c = *s++) != '\0') |
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66 if (c == '\n') |
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67 count++; |
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68 } |
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69 return count; |
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70 } |
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71 |
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72 // For now, use the variables from readline. It already handles |
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73 // SIGWINCH, so these values have a good chance of being correct even |
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74 // if the window changes size (they will be wrong if, for example, the |
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75 // luser changes the window size while the pager is running, and the |
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76 // signal is handled by the pager instead of us. |
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77 |
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78 int |
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79 terminal_columns (void) |
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80 { |
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81 extern int screenwidth; |
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82 return screenwidth > 0 ? screenwidth : 80; |
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83 } |
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84 |
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85 int |
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86 terminal_rows (void) |
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87 { |
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88 extern int screenheight; |
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89 return screenheight > 0 ? screenheight : 24; |
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90 } |
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91 |
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92 void |
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93 initialize_pager (void) |
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94 { |
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95 delete pager_buf; |
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96 pager_buf = new ostrstream (); |
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97 } |
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98 |
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99 void |
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100 maybe_page_output (ostrstream& msg_buf) |
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101 { |
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102 msg_buf << ends; |
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103 |
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104 char *message = msg_buf.str (); |
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105 |
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106 if (interactive |
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107 && user_pref.page_screen_output |
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108 && user_pref.pager_binary) |
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109 { |
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110 *pager_buf << message; |
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111 delete [] message; |
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112 } |
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113 else |
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114 { |
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115 cout << message; |
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116 cout.flush (); |
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117 delete [] message; |
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118 } |
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119 } |
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120 |
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121 void |
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122 flush_output_to_pager (void) |
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123 { |
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124 // Extract message from buffer, then delete the buffer so that any |
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125 // new messages get sent separately. |
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126 |
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127 *pager_buf << ends; |
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128 char *message = pager_buf->str (); |
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129 initialize_pager (); |
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130 |
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131 if (! message || ! *message) |
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132 { |
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133 delete [] message; |
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134 return; |
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135 } |
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136 |
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137 maybe_write_to_diary_file (message); |
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138 |
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139 int nlines = line_count (message); |
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140 |
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141 if (nlines > terminal_rows () - 2) |
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142 { |
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143 char *pgr = user_pref.pager_binary; |
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144 if (pgr) |
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145 { |
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146 oprocstream pager_stream (pgr); |
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147 if (pager_stream) |
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148 { |
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149 volatile sig_handler *old_sigint_handler; |
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150 old_sigint_handler = signal (SIGINT, SIG_IGN); |
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151 |
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152 pager_stream << message; |
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153 delete [] message; |
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154 pager_stream.flush (); |
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155 |
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156 signal (SIGINT, old_sigint_handler); |
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157 |
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158 return; |
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159 } |
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160 } |
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161 } |
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162 |
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163 cout << message; |
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164 delete [] message; |
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165 cout.flush (); |
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166 } |
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167 |
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168 static void |
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169 open_diary_file (void) |
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170 { |
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171 if (diary_stream.is_open ()) |
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172 diary_stream.close (); |
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173 |
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174 diary_stream.open (diary_file, ios::app); |
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175 |
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176 if (! diary_stream) |
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177 error ("diary: can't open diary file `%s'", diary_file); |
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178 } |
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179 |
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180 void |
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181 close_diary_file (void) |
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182 { |
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183 if (diary_stream) |
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184 diary_stream.close (); |
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185 } |
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186 |
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187 void |
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188 maybe_write_to_diary_file (const char *s) |
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189 { |
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190 if (write_to_diary_file && diary_stream) |
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191 diary_stream << s; |
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192 } |
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193 |
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194 DEFUN_TEXT ("diary", Fdiary, Sdiary, -1, 1, |
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195 "diary [on|off]\n\ |
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196 diary [file]\n\ |
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197 \n\ |
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198 redirect all input and screen output to a file.") |
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199 { |
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200 Octave_object retval; |
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201 |
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202 DEFINE_ARGV("diary"); |
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203 |
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204 switch (argc) |
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205 { |
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206 case 1: |
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207 write_to_diary_file = ! write_to_diary_file; |
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208 open_diary_file (); |
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209 break; |
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210 |
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211 case 2: |
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212 { |
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213 char *arg = argv[1]; |
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214 if (strcmp (arg, "on") == 0) |
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215 { |
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216 write_to_diary_file = 1; |
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217 open_diary_file (); |
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218 } |
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219 else if (strcmp (arg, "off") == 0) |
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220 write_to_diary_file = 0; |
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221 else |
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222 { |
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223 delete [] diary_file; |
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224 diary_file = strsave (arg); |
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225 open_diary_file (); |
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226 } |
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227 } |
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228 break; |
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229 |
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230 default: |
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231 print_usage ("diary"); |
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232 break; |
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233 } |
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234 |
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235 DELETE_ARGV; |
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236 |
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237 return retval; |
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238 } |
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239 |
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240 /* |
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241 ;;; Local Variables: *** |
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242 ;;; mode: C++ *** |
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243 ;;; page-delimiter: "^/\\*" *** |
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244 ;;; End: *** |
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245 */ |
