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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 "tree-const.h" |
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45 #include "unwind-prot.h" |
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46 #include "user-prefs.h" |
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47 #include "utils.h" |
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48 #include "variables.h" |
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49 |
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50 // Where we stash output headed for the screen. |
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51 static ostrstream *pager_buf = 0; |
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52 |
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53 // Nonzero means we write to the diary file. |
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54 static int write_to_diary_file = 0; |
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55 |
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56 // The name of the current diary file. |
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57 static char *diary_file = 0; |
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58 |
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59 // The diary file. |
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60 static ofstream diary_stream; |
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61 |
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62 static int |
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63 line_count (char *s) |
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64 { |
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65 int count = 0; |
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66 if (s) |
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67 { |
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68 char c; |
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69 while ((c = *s++) != '\0') |
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70 if (c == '\n') |
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71 count++; |
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72 } |
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73 return count; |
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74 } |
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75 |
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76 // For now, use the variables from readline. It already handles |
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77 // SIGWINCH, so these values have a good chance of being correct even |
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78 // if the window changes size (they will be wrong if, for example, the |
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79 // luser changes the window size while the pager is running, and the |
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80 // signal is handled by the pager instead of us. |
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81 |
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82 int |
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83 terminal_columns (void) |
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84 { |
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85 extern int screenwidth; |
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86 return screenwidth > 0 ? screenwidth : 80; |
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87 } |
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88 |
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89 int |
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90 terminal_rows (void) |
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91 { |
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92 extern int screenheight; |
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93 return screenheight > 0 ? screenheight : 24; |
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94 } |
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95 |
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96 void |
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97 initialize_pager (void) |
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98 { |
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99 delete pager_buf; |
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100 pager_buf = new ostrstream (); |
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101 } |
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102 |
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103 void |
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104 maybe_page_output (ostrstream& msg_buf) |
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105 { |
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106 msg_buf << ends; |
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107 |
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108 char *message = msg_buf.str (); |
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109 |
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110 if (interactive |
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111 && user_pref.page_screen_output |
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112 && user_pref.pager_binary) |
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113 { |
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114 *pager_buf << message; |
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115 delete [] message; |
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116 } |
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117 else |
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118 { |
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119 cout << message; |
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120 cout.flush (); |
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121 delete [] message; |
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122 } |
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123 } |
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124 |
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125 void |
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126 flush_output_to_pager (void) |
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127 { |
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128 // Extract message from buffer, then delete the buffer so that any |
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129 // new messages get sent separately. |
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130 |
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131 *pager_buf << ends; |
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132 char *message = pager_buf->str (); |
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133 initialize_pager (); |
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134 |
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135 if (! message || ! *message) |
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136 { |
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137 delete [] message; |
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138 return; |
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139 } |
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140 |
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141 maybe_write_to_diary_file (message); |
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142 |
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143 int nlines = line_count (message); |
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144 |
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145 if (nlines > terminal_rows () - 2) |
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146 { |
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147 char *pgr = user_pref.pager_binary; |
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148 if (pgr) |
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149 { |
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150 volatile sig_handler *old_sigint_handler; |
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151 old_sigint_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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152 |
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153 oprocstream *pager_stream = new oprocstream (pgr); |
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154 |
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155 add_unwind_protect (cleanup_oprocstream, pager_stream); |
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156 |
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157 int output_paged = 0; |
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158 if (pager_stream && *pager_stream) |
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159 { |
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160 output_paged = 1; |
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161 *pager_stream << message; |
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162 delete [] message; |
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163 pager_stream->flush (); |
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164 pager_stream->close (); |
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165 } |
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166 |
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167 run_unwind_protect (); |
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168 |
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169 octave_set_signal_handler (SIGINT, old_sigint_handler); |
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170 |
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171 if (output_paged) |
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172 return; |
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173 } |
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174 } |
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175 |
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176 cout << message; |
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177 delete [] message; |
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178 cout.flush (); |
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179 } |
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180 |
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181 static void |
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182 open_diary_file (void) |
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183 { |
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184 if (diary_stream.is_open ()) |
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185 diary_stream.close (); |
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186 |
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187 diary_stream.open (diary_file, ios::app); |
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188 |
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189 if (! diary_stream) |
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190 error ("diary: can't open diary file `%s'", diary_file); |
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191 } |
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192 |
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193 void |
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194 close_diary_file (void) |
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195 { |
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196 if (diary_stream) |
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197 diary_stream.close (); |
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198 } |
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199 |
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200 void |
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201 maybe_write_to_diary_file (const char *s) |
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202 { |
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203 if (write_to_diary_file && diary_stream) |
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204 diary_stream << s; |
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205 } |
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206 |
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207 DEFUN_TEXT ("diary", Fdiary, Sdiary, -1, 1, |
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208 "diary [on|off]\n\ |
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209 diary [file]\n\ |
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210 \n\ |
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211 redirect all input and screen output to a file.") |
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212 { |
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213 Octave_object retval; |
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214 |
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215 DEFINE_ARGV ("diary"); |
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216 |
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217 if (! diary_file) |
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218 diary_file = strsave ("diary"); |
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219 |
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220 switch (argc) |
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221 { |
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222 case 1: |
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223 write_to_diary_file = ! write_to_diary_file; |
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224 open_diary_file (); |
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225 break; |
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226 |
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227 case 2: |
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228 { |
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229 char *arg = argv[1]; |
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230 if (strcmp (arg, "on") == 0) |
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231 { |
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232 write_to_diary_file = 1; |
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233 open_diary_file (); |
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234 } |
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235 else if (strcmp (arg, "off") == 0) |
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236 write_to_diary_file = 0; |
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237 else |
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238 { |
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239 delete [] diary_file; |
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240 diary_file = strsave (arg); |
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241 open_diary_file (); |
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242 } |
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243 } |
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244 break; |
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245 |
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246 default: |
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247 print_usage ("diary"); |
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248 break; |
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249 } |
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250 |
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251 DELETE_ARGV; |
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252 |
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253 return retval; |
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254 } |
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255 |
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256 DEFUN_TEXT ("more", Fmore, Smore, -1, 1, |
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257 "more on\n\ |
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258 more off\n\ |
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259 \n\ |
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260 Turn output pagination on or off.") |
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261 { |
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262 Octave_object retval; |
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263 |
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264 DEFINE_ARGV ("more"); |
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265 |
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266 if (argc == 2) |
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267 { |
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268 char *arg = argv[1]; |
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269 |
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270 if (strcmp (arg, "on") == 0) |
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271 bind_builtin_variable ("page_screen_output", "true"); |
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272 else if (strcmp (arg, "off") == 0) |
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273 bind_builtin_variable ("page_screen_output", "false"); |
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274 else |
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275 error ("more: unrecognized argument `%s'", arg); |
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276 } |
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277 else |
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278 print_usage ("more"); |
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279 |
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280 DELETE_ARGV; |
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281 |
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282 return retval; |
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283 } |
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284 |
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285 /* |
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286 ;;; Local Variables: *** |
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287 ;;; mode: C++ *** |
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288 ;;; page-delimiter: "^/\\*" *** |
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289 ;;; End: *** |
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290 */ |
