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1 /* |
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2 |
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1884
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3 Copyright (C) 1996 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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240
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <csignal> |
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28 |
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1755
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29 #include <string> |
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30 #include <fstream.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 "defaults.h" |
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1352
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35 #include "defun.h" |
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36 #include "error.h" |
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37 #include "help.h" |
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38 #include "oct-obj.h" |
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39 #include "pager.h" |
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40 #include "sighandlers.h" |
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41 #include "unwind-prot.h" |
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42 #include "user-prefs.h" |
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43 |
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44 pid_t octave_pager_pid = -1; |
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45 |
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46 // Our actual connection to the external pager. |
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47 static oprocstream *external_pager = 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 string diary_file; |
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54 |
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55 // The diary file. |
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56 static ofstream external_diary_file; |
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57 |
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58 static sig_handler *saved_sigint_handler = 0; |
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59 |
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60 static int really_flush_to_pager = 0; |
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61 |
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62 static void |
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63 do_sync (const char *msg) |
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64 { |
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65 if (! error_state) |
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66 { |
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67 if (msg && *msg) |
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68 { |
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69 if (! external_pager) |
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70 { |
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71 string pgr = user_pref.pager_binary; |
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72 |
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73 if (! pgr.empty ()) |
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74 { |
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75 saved_sigint_handler |
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76 = octave_set_signal_handler (SIGINT, SIG_IGN); |
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77 |
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78 external_pager = new oprocstream (pgr.c_str ()); |
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79 |
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80 if (external_pager) |
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81 octave_pager_pid = external_pager->pid (); |
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82 } |
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83 } |
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84 |
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85 if (external_pager) |
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86 { |
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87 *external_pager << msg; |
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88 |
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89 if (external_pager->fail ()) |
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90 { |
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91 octave_pager_pid = -1; |
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92 |
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93 delete external_pager; |
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94 external_pager = 0; |
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95 |
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96 if (saved_sigint_handler) |
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97 { |
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98 octave_set_signal_handler (SIGINT, saved_sigint_handler); |
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99 saved_sigint_handler = 0; |
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100 } |
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101 } |
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102 else |
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103 external_pager->flush (); |
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104 } |
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105 else |
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106 cout << msg; |
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107 } |
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108 } |
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109 } |
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110 |
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111 int |
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112 octave_pager_buf::sync (void) |
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113 { |
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114 if (really_flush_to_pager |
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115 || (user_pref.page_screen_output && user_pref.page_output_immediately) |
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116 || ! user_pref.page_screen_output) |
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117 { |
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118 sputc ('\0'); |
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119 |
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120 char *buf = eback (); |
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121 |
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122 do_sync (buf); |
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123 |
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124 octave_diary << buf; |
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125 |
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126 seekoff (0, ios::beg); |
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127 } |
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128 |
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129 return 0; |
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130 } |
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131 |
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132 int |
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133 octave_diary_buf::sync (void) |
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134 { |
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135 sputc ('\0'); |
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136 |
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137 if (write_to_diary_file && external_diary_file) |
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138 external_diary_file << eback (); |
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139 |
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140 seekoff (0, ios::beg); |
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141 |
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142 return 0; |
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143 } |
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144 |
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145 octave_pager_stream *octave_pager_stream::instance = 0; |
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146 |
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147 octave_pager_stream::octave_pager_stream (void) : ostream (), pb (0) |
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148 { |
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149 pb = new octave_pager_buf; |
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150 rdbuf (pb); |
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151 setf (unitbuf); |
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152 } |
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153 |
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154 octave_pager_stream::~octave_pager_stream (void) |
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155 { |
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156 flush (); |
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157 delete pb; |
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158 } |
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159 |
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160 octave_pager_stream& |
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161 octave_pager_stream::stream (void) |
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162 { |
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163 if (! instance) |
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164 instance = new octave_pager_stream (); |
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165 |
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166 return *instance; |
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167 } |
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168 |
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169 octave_diary_stream *octave_diary_stream::instance = 0; |
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170 |
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171 octave_diary_stream::octave_diary_stream (void) : ostream (), db (0) |
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172 { |
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173 db = new octave_diary_buf; |
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174 rdbuf (db); |
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175 setf (unitbuf); |
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176 } |
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177 |
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178 octave_diary_stream::~octave_diary_stream (void) |
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179 { |
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180 flush (); |
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181 delete db; |
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182 } |
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183 |
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184 octave_diary_stream& |
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185 octave_diary_stream::stream (void) |
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186 { |
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187 if (! instance) |
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188 instance = new octave_diary_stream (); |
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189 |
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190 return *instance; |
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191 } |
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192 |
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193 void |
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194 flush_octave_stdout (void) |
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195 { |
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196 begin_unwind_frame ("flush_octave_stdout"); |
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197 |
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198 unwind_protect_int (really_flush_to_pager); |
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199 |
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200 really_flush_to_pager = 1; |
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201 |
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202 octave_stdout.flush (); |
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203 |
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204 if (external_pager) |
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205 { |
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206 octave_pager_pid = -1; |
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207 |
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208 delete external_pager; |
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209 external_pager = 0; |
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210 |
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211 if (saved_sigint_handler) |
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212 { |
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213 octave_set_signal_handler (SIGINT, saved_sigint_handler); |
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214 saved_sigint_handler = 0; |
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215 } |
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216 } |
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217 |
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218 run_unwind_frame ("flush_octave_stdout"); |
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219 } |
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220 |
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221 static void |
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222 close_diary_file (void) |
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223 { |
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224 if (external_diary_file.is_open ()) |
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225 { |
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226 octave_diary.flush (); |
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227 external_diary_file.close (); |
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228 } |
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229 } |
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230 |
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231 static void |
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232 open_diary_file (void) |
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233 { |
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234 close_diary_file (); |
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235 |
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236 external_diary_file.open (diary_file.c_str (), ios::app); |
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237 |
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238 if (! external_diary_file) |
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239 error ("diary: can't open diary file `%s'", diary_file.c_str ()); |
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240 } |
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241 |
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242 DEFUN_TEXT (diary, args, , |
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243 "diary [on|off]\n\ |
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244 diary [file]\n\ |
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245 \n\ |
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246 redirect all input and screen output to a file.") |
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247 { |
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248 octave_value_list retval; |
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249 |
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250 int argc = args.length () + 1; |
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251 |
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252 string_vector argv = args.make_argv ("diary"); |
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253 |
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254 if (error_state) |
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255 return retval; |
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256 |
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257 if (diary_file.empty ()) |
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258 diary_file = "diary"; |
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259 |
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260 switch (argc) |
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261 { |
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262 case 1: |
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263 write_to_diary_file = ! write_to_diary_file; |
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264 open_diary_file (); |
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265 break; |
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266 |
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267 case 2: |
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268 { |
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269 string arg = argv[1]; |
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270 |
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271 if (arg == "on") |
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272 { |
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273 write_to_diary_file = 1; |
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274 open_diary_file (); |
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275 } |
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276 else if (arg == "off") |
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277 { |
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278 close_diary_file (); |
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279 write_to_diary_file = 0; |
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280 } |
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281 else |
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282 { |
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283 diary_file = arg; |
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284 open_diary_file (); |
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285 } |
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286 } |
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287 break; |
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288 |
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289 default: |
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290 print_usage ("diary"); |
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291 break; |
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292 } |
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293 |
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294 return retval; |
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295 } |
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296 |
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297 DEFUN_TEXT (more, args, , |
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298 "more on\n\ |
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299 more off\n\ |
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300 \n\ |
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301 Turn output pagination on or off.") |
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302 { |
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303 octave_value_list retval; |
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304 |
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305 int argc = args.length () + 1; |
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306 |
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307 string_vector argv = args.make_argv ("more"); |
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308 |
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309 if (error_state) |
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310 return retval; |
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311 |
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312 if (argc == 2) |
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313 { |
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314 string arg = argv[1]; |
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315 |
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316 if (arg == "on") |
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317 bind_builtin_variable ("page_screen_output", "true"); |
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318 else if (arg == "off") |
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319 bind_builtin_variable ("page_screen_output", "false"); |
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320 else |
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321 error ("more: unrecognized argument `%s'", arg.c_str ()); |
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322 } |
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323 else |
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324 print_usage ("more"); |
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325 |
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326 return retval; |
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327 } |
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328 |
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329 static string |
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330 default_pager (void) |
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331 { |
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332 string pager_binary; |
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333 |
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334 char *pgr = getenv ("PAGER"); |
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335 |
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336 if (pgr) |
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337 pager_binary = string (pgr); |
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338 #ifdef DEFAULT_PAGER |
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339 else |
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340 { |
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341 pager_binary = string (DEFAULT_PAGER); |
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342 |
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343 if (pager_binary == "less") |
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344 { |
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345 pager_binary.append (" -e"); |
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346 |
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347 if (! getenv ("LESS")) |
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348 pager_binary.append |
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349 (" -P'-- less ?pB(%pB\\%):--. (f)orward, (b)ack, (q)uit$'"); |
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350 } |
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351 } |
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352 #endif |
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353 |
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354 return pager_binary; |
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355 } |
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356 |
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357 void |
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358 symbols_of_pager (void) |
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359 { |
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360 DEFVAR (PAGER, default_pager (), 0, sv_pager_binary, |
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361 "path to pager binary"); |
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362 |
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363 DEFVAR (page_output_immediately, 1.0, 0, page_output_immediately, |
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364 "if possible, send output intended for the screen through the pager"); |
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365 |
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366 DEFVAR (page_screen_output, 1.0, 0, page_screen_output, |
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367 "if possible, send output intended for the screen through the pager"); |
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368 } |
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369 |
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370 /* |
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371 ;;; Local Variables: *** |
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372 ;;; mode: C++ *** |
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373 ;;; End: *** |
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374 */ |
