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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 <string> |
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32 |
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33 #include <iostream.h> |
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34 #include <strstream.h> |
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35 #include <fstream.h> |
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36 |
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37 #include "procstream.h" |
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38 |
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39 #include "str-vec.h" |
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40 |
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41 #include "defun.h" |
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42 #include "error.h" |
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43 #include "help.h" |
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44 #include "input.h" |
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45 #include "oct-obj.h" |
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46 #include "pager.h" |
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47 #include "pt-const.h" |
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48 #include "sighandlers.h" |
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49 #include "unwind-prot.h" |
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50 #include "user-prefs.h" |
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51 #include "utils.h" |
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52 #include "variables.h" |
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53 |
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54 // Where we stash output headed for the screen. |
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529
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55 static ostrstream *pager_buf = 0; |
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56 |
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57 // Nonzero means we write to the diary file. |
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58 static int write_to_diary_file = 0; |
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59 |
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60 // The name of the current diary file. |
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61 static string diary_file; |
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62 |
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63 // The diary file. |
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64 static ofstream diary_stream; |
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65 |
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66 static int |
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67 line_count (char *s) |
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68 { |
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69 int count = 0; |
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70 if (s) |
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71 { |
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72 char c; |
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73 while ((c = *s++) != '\0') |
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74 if (c == '\n') |
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75 count++; |
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76 } |
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77 return count; |
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78 } |
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79 |
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80 // For now, use the variables from readline. It already handles |
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81 // SIGWINCH, so these values have a good chance of being correct even |
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82 // if the window changes size (they will be wrong if, for example, the |
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83 // luser changes the window size while the pager is running, and the |
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84 // signal is handled by the pager instead of us. |
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85 |
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86 int |
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87 terminal_columns (void) |
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88 { |
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89 extern int screenwidth; |
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90 return screenwidth > 0 ? screenwidth : 80; |
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91 } |
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92 |
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93 int |
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94 terminal_rows (void) |
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95 { |
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96 extern int screenheight; |
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97 return screenheight > 0 ? screenheight : 24; |
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98 } |
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99 |
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100 void |
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101 initialize_pager (void) |
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102 { |
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103 delete pager_buf; |
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104 pager_buf = new ostrstream (); |
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105 } |
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106 |
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107 void |
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108 maybe_page_output (ostrstream& msg_buf) |
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109 { |
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110 msg_buf << ends; |
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111 |
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112 char *message = msg_buf.str (); |
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113 |
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114 if (message) |
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115 { |
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116 maybe_write_to_diary_file (message); |
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117 |
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118 if (interactive |
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119 && user_pref.page_screen_output |
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120 && ! user_pref.pager_binary.empty ()) |
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121 { |
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122 *pager_buf << message; |
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123 } |
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124 else |
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125 { |
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126 cout << message; |
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127 cout.flush (); |
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128 } |
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129 |
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130 delete [] message; |
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131 } |
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132 } |
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133 |
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134 void |
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135 flush_output_to_pager (void) |
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136 { |
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137 // Extract message from buffer, then delete the buffer so that any |
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138 // new messages get sent separately. |
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139 |
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140 *pager_buf << ends; |
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141 char *message = pager_buf->str (); |
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142 initialize_pager (); |
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143 |
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144 if (! message || ! *message) |
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145 { |
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146 delete [] message; |
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147 return; |
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148 } |
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149 |
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150 int nlines = line_count (message); |
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151 |
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152 if (nlines > terminal_rows () - 2) |
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153 { |
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154 string pgr = user_pref.pager_binary; |
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155 |
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156 if (! pgr.empty ()) |
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157 { |
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158 volatile sig_handler *old_sigint_handler; |
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159 old_sigint_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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160 |
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161 oprocstream *pager_stream = new oprocstream (pgr.c_str ()); |
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162 |
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163 add_unwind_protect (cleanup_oprocstream, pager_stream); |
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164 |
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165 int output_paged = 0; |
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166 if (pager_stream && *pager_stream) |
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167 { |
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168 output_paged = 1; |
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169 *pager_stream << message; |
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170 delete [] message; |
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171 pager_stream->flush (); |
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172 pager_stream->close (); |
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173 } |
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174 |
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175 run_unwind_protect (); |
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176 |
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177 octave_set_signal_handler (SIGINT, old_sigint_handler); |
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178 |
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179 if (output_paged) |
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180 return; |
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181 } |
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182 } |
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183 |
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184 cout << message; |
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185 delete [] message; |
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186 cout.flush (); |
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187 } |
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188 |
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189 static void |
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190 open_diary_file (void) |
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191 { |
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192 if (diary_stream.is_open ()) |
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193 diary_stream.close (); |
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194 |
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195 diary_stream.open (diary_file.c_str (), ios::app); |
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196 |
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197 if (! diary_stream) |
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198 error ("diary: can't open diary file `%s'", diary_file.c_str ()); |
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199 } |
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200 |
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201 void |
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202 close_diary_file (void) |
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203 { |
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204 if (diary_stream) |
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205 diary_stream.close (); |
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206 } |
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207 |
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208 void |
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209 maybe_write_to_diary_file (const char *s) |
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210 { |
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211 if (write_to_diary_file && diary_stream) |
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212 diary_stream << s; |
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213 } |
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214 |
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215 DEFUN_TEXT ("diary", Fdiary, Sdiary, 10, |
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216 "diary [on|off]\n\ |
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217 diary [file]\n\ |
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218 \n\ |
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219 redirect all input and screen output to a file.") |
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220 { |
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221 Octave_object retval; |
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222 |
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223 int argc = args.length () + 1; |
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224 |
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225 string_vector argv = make_argv (args, "diary"); |
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226 |
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227 if (error_state) |
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228 return retval; |
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229 |
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230 if (diary_file.empty ()) |
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231 diary_file = "diary"; |
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232 |
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233 switch (argc) |
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234 { |
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235 case 1: |
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236 write_to_diary_file = ! write_to_diary_file; |
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237 open_diary_file (); |
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238 break; |
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239 |
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240 case 2: |
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241 { |
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242 string arg = argv[1]; |
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243 |
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244 if (arg == "on") |
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245 { |
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246 write_to_diary_file = 1; |
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247 open_diary_file (); |
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248 } |
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249 else if (arg == "off") |
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250 write_to_diary_file = 0; |
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251 else |
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252 { |
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253 diary_file = arg; |
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254 open_diary_file (); |
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255 } |
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256 } |
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257 break; |
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258 |
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259 default: |
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260 print_usage ("diary"); |
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261 break; |
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262 } |
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263 |
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264 return retval; |
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265 } |
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266 |
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267 DEFUN_TEXT ("more", Fmore, Smore, 10, |
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268 "more on\n\ |
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269 more off\n\ |
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270 \n\ |
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271 Turn output pagination on or off.") |
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272 { |
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273 Octave_object retval; |
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274 |
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275 int argc = args.length () + 1; |
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276 |
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277 string_vector argv = make_argv (args, "more"); |
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278 |
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279 if (error_state) |
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280 return retval; |
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281 |
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282 if (argc == 2) |
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283 { |
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284 string arg = argv[1]; |
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285 |
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286 if (arg == "on") |
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287 bind_builtin_variable ("page_screen_output", "true"); |
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288 else if (arg == "off") |
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289 bind_builtin_variable ("page_screen_output", "false"); |
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290 else |
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291 error ("more: unrecognized argument `%s'", arg.c_str ()); |
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292 } |
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293 else |
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294 print_usage ("more"); |
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295 |
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296 return retval; |
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297 } |
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298 |
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299 /* |
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300 ;;; Local Variables: *** |
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301 ;;; mode: C++ *** |
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302 ;;; page-delimiter: "^/\\*" *** |
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303 ;;; End: *** |
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304 */ |
