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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, 1995 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 <csignal> |
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29 #include <cstdlib> |
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30 |
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31 #include <iostream.h> |
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32 #include <strstream.h> |
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33 #include <fstream.h> |
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34 |
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35 #include "procstream.h" |
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36 |
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37 #include "defun.h" |
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38 #include "error.h" |
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39 #include "help.h" |
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40 #include "input.h" |
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41 #include "oct-obj.h" |
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42 #include "pager.h" |
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43 #include "sighandlers.h" |
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44 #include "user-prefs.h" |
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45 #include "utils.h" |
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46 |
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47 // Where we stash output headed for the screen. |
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48 static ostrstream *pager_buf = 0; |
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49 |
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50 // Nonzero means we write to the diary file. |
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51 static int write_to_diary_file = 0; |
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52 |
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53 // The name of the current diary file. |
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54 static char *diary_file = 0; |
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55 |
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56 // The diary file. |
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57 static ofstream diary_stream; |
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58 |
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59 static int |
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60 line_count (char *s) |
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61 { |
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62 int count = 0; |
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63 if (s) |
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64 { |
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65 char c; |
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66 while ((c = *s++) != '\0') |
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67 if (c == '\n') |
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68 count++; |
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69 } |
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70 return count; |
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71 } |
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72 |
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73 // For now, use the variables from readline. It already handles |
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74 // SIGWINCH, so these values have a good chance of being correct even |
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75 // if the window changes size (they will be wrong if, for example, the |
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76 // luser changes the window size while the pager is running, and the |
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77 // signal is handled by the pager instead of us. |
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78 |
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79 int |
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80 terminal_columns (void) |
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81 { |
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82 extern int screenwidth; |
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83 return screenwidth > 0 ? screenwidth : 80; |
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84 } |
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85 |
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86 int |
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87 terminal_rows (void) |
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88 { |
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89 extern int screenheight; |
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90 return screenheight > 0 ? screenheight : 24; |
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91 } |
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92 |
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93 void |
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94 initialize_pager (void) |
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95 { |
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96 delete pager_buf; |
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97 pager_buf = new ostrstream (); |
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98 } |
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99 |
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100 void |
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101 maybe_page_output (ostrstream& msg_buf) |
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102 { |
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103 msg_buf << ends; |
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104 |
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105 char *message = msg_buf.str (); |
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106 |
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107 if (interactive |
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108 && user_pref.page_screen_output |
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109 && user_pref.pager_binary) |
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110 { |
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111 *pager_buf << message; |
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112 delete [] message; |
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113 } |
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114 else |
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115 { |
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116 cout << message; |
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117 cout.flush (); |
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118 delete [] message; |
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119 } |
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120 } |
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121 |
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122 void |
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123 flush_output_to_pager (void) |
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124 { |
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125 // Extract message from buffer, then delete the buffer so that any |
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126 // new messages get sent separately. |
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127 |
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128 *pager_buf << ends; |
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129 char *message = pager_buf->str (); |
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130 initialize_pager (); |
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131 |
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132 if (! message || ! *message) |
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133 { |
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134 delete [] message; |
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135 return; |
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136 } |
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137 |
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138 maybe_write_to_diary_file (message); |
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139 |
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140 int nlines = line_count (message); |
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141 |
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142 if (nlines > terminal_rows () - 2) |
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143 { |
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144 char *pgr = user_pref.pager_binary; |
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145 if (pgr) |
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146 { |
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147 oprocstream pager_stream (pgr); |
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148 if (pager_stream) |
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149 { |
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150 volatile sig_handler *old_sigint_handler; |
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151 old_sigint_handler = signal (SIGINT, SIG_IGN); |
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152 |
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153 pager_stream << message; |
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154 delete [] message; |
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155 pager_stream.flush (); |
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156 pager_stream.close (); |
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157 |
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158 signal (SIGINT, old_sigint_handler); |
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159 |
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160 return; |
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161 } |
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162 } |
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163 } |
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164 |
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165 cout << message; |
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166 delete [] message; |
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167 cout.flush (); |
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168 } |
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169 |
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170 static void |
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171 open_diary_file (void) |
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172 { |
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173 if (diary_stream.is_open ()) |
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174 diary_stream.close (); |
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175 |
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176 diary_stream.open (diary_file, ios::app); |
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177 |
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178 if (! diary_stream) |
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179 error ("diary: can't open diary file `%s'", diary_file); |
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180 } |
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181 |
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182 void |
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183 close_diary_file (void) |
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184 { |
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185 if (diary_stream) |
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186 diary_stream.close (); |
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187 } |
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188 |
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189 void |
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190 maybe_write_to_diary_file (const char *s) |
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191 { |
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192 if (write_to_diary_file && diary_stream) |
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193 diary_stream << s; |
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194 } |
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195 |
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196 DEFUN_TEXT ("diary", Fdiary, Sdiary, -1, 1, |
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197 "diary [on|off]\n\ |
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198 diary [file]\n\ |
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199 \n\ |
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200 redirect all input and screen output to a file.") |
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201 { |
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202 Octave_object retval; |
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203 |
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204 DEFINE_ARGV("diary"); |
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205 |
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206 if (! diary_file) |
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207 diary_file = strsave ("diary"); |
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208 |
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209 switch (argc) |
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210 { |
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211 case 1: |
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212 write_to_diary_file = ! write_to_diary_file; |
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213 open_diary_file (); |
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214 break; |
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215 |
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216 case 2: |
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217 { |
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218 char *arg = argv[1]; |
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219 if (strcmp (arg, "on") == 0) |
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220 { |
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221 write_to_diary_file = 1; |
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222 open_diary_file (); |
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223 } |
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224 else if (strcmp (arg, "off") == 0) |
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225 write_to_diary_file = 0; |
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226 else |
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227 { |
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228 delete [] diary_file; |
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229 diary_file = strsave (arg); |
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230 open_diary_file (); |
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231 } |
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232 } |
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233 break; |
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234 |
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235 default: |
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236 print_usage ("diary"); |
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237 break; |
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238 } |
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239 |
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240 DELETE_ARGV; |
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241 |
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242 return retval; |
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243 } |
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244 |
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245 /* |
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246 ;;; Local Variables: *** |
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247 ;;; mode: C++ *** |
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248 ;;; page-delimiter: "^/\\*" *** |
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249 ;;; End: *** |
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250 */ |
