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1 /* |
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2 |
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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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1352
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34 #include "defun.h" |
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35 #include "error.h" |
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36 #include "help.h" |
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37 #include "oct-obj.h" |
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38 #include "pager.h" |
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39 #include "sighandlers.h" |
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40 #include "user-prefs.h" |
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41 |
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42 pid_t octave_pager_pid = -1; |
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43 |
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44 // Our actual connection to the external pager. |
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45 static oprocstream *external_pager = 0; |
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46 |
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47 // Nonzero means we write to the diary file. |
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48 static int write_to_diary_file = 0; |
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49 |
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50 // The name of the current diary file. |
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51 static string diary_file; |
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52 |
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53 // The diary file. |
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54 static ofstream external_diary_file; |
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55 |
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56 static sig_handler *saved_sigint_handler = 0; |
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57 |
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58 static void |
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59 do_sync (const char *msg) |
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60 { |
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61 if (! error_state) |
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62 { |
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63 if (msg && *msg) |
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64 { |
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65 if (! external_pager) |
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66 { |
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67 string pgr = user_pref.pager_binary; |
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68 |
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69 if (! pgr.empty ()) |
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70 { |
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71 saved_sigint_handler |
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72 = octave_set_signal_handler (SIGINT, SIG_IGN); |
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73 |
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74 external_pager = new oprocstream (pgr.c_str ()); |
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75 |
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76 if (external_pager) |
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77 octave_pager_pid = external_pager->pid (); |
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78 } |
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79 } |
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80 |
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81 if (external_pager) |
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82 { |
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83 *external_pager << msg; |
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84 |
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85 if (external_pager->fail ()) |
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86 { |
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87 octave_pager_pid = -1; |
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88 |
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89 delete external_pager; |
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90 external_pager = 0; |
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91 |
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92 if (saved_sigint_handler) |
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93 { |
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94 octave_set_signal_handler (SIGINT, saved_sigint_handler); |
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95 saved_sigint_handler = 0; |
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96 } |
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97 } |
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98 else |
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99 external_pager->flush (); |
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100 } |
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101 else |
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102 cout << msg; |
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103 } |
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104 } |
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105 } |
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106 |
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107 int |
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108 octave_pager_buf::sync (void) |
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109 { |
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110 sputc ('\0'); |
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111 |
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112 char *buf = eback (); |
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113 |
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114 do_sync (buf); |
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115 |
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116 octave_diary << buf; |
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117 |
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118 seekoff (0, ios::beg); |
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119 |
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120 return 0; |
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121 } |
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122 |
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123 int |
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124 octave_diary_buf::sync (void) |
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125 { |
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126 sputc ('\0'); |
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127 |
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128 if (write_to_diary_file && external_diary_file) |
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129 external_diary_file << eback (); |
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130 |
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131 seekoff (0, ios::beg); |
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132 |
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133 return 0; |
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134 } |
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135 |
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136 octave_pager_stream *octave_pager_stream::instance = 0; |
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137 |
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138 octave_pager_stream::octave_pager_stream (void) : ostream (), pb (0) |
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139 { |
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140 pb = new octave_pager_buf; |
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141 rdbuf (pb); |
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142 setf (unitbuf); |
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143 } |
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144 |
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145 octave_pager_stream::~octave_pager_stream (void) |
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146 { |
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147 flush (); |
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148 delete pb; |
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149 } |
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150 |
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151 octave_pager_stream& |
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152 octave_pager_stream::stream (void) |
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153 { |
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154 if (! instance) |
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155 instance = new octave_pager_stream (); |
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156 |
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157 return *instance; |
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158 } |
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159 |
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160 octave_diary_stream *octave_diary_stream::instance = 0; |
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161 |
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162 octave_diary_stream::octave_diary_stream (void) : ostream (), db (0) |
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163 { |
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164 db = new octave_diary_buf; |
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165 rdbuf (db); |
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166 setf (unitbuf); |
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167 } |
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168 |
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169 octave_diary_stream::~octave_diary_stream (void) |
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170 { |
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171 flush (); |
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172 delete db; |
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173 } |
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174 |
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175 octave_diary_stream& |
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176 octave_diary_stream::stream (void) |
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177 { |
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178 if (! instance) |
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179 instance = new octave_diary_stream (); |
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180 |
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181 return *instance; |
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182 } |
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183 |
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184 void |
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185 flush_octave_stdout (void) |
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186 { |
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187 octave_stdout.flush (); |
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188 |
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189 if (external_pager) |
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190 { |
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191 octave_pager_pid = -1; |
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192 |
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193 delete external_pager; |
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194 external_pager = 0; |
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195 |
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196 if (saved_sigint_handler) |
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197 { |
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198 octave_set_signal_handler (SIGINT, saved_sigint_handler); |
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199 saved_sigint_handler = 0; |
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200 } |
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201 } |
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202 } |
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203 |
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204 static void |
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205 close_diary_file (void) |
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206 { |
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207 if (external_diary_file.is_open ()) |
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208 { |
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209 octave_diary.flush (); |
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210 external_diary_file.close (); |
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211 } |
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212 } |
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213 |
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214 static void |
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215 open_diary_file (void) |
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216 { |
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217 close_diary_file (); |
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218 |
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219 external_diary_file.open (diary_file.c_str (), ios::app); |
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220 |
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221 if (! external_diary_file) |
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222 error ("diary: can't open diary file `%s'", diary_file.c_str ()); |
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223 } |
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224 |
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225 DEFUN_TEXT (diary, args, , |
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226 "diary [on|off]\n\ |
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227 diary [file]\n\ |
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228 \n\ |
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229 redirect all input and screen output to a file.") |
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230 { |
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231 octave_value_list retval; |
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232 |
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233 int argc = args.length () + 1; |
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234 |
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235 string_vector argv = args.make_argv ("diary"); |
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236 |
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237 if (error_state) |
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238 return retval; |
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239 |
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240 if (diary_file.empty ()) |
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241 diary_file = "diary"; |
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242 |
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243 switch (argc) |
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244 { |
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245 case 1: |
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246 write_to_diary_file = ! write_to_diary_file; |
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247 open_diary_file (); |
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248 break; |
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249 |
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250 case 2: |
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251 { |
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252 string arg = argv[1]; |
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253 |
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254 if (arg == "on") |
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255 { |
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256 write_to_diary_file = 1; |
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257 open_diary_file (); |
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258 } |
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259 else if (arg == "off") |
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260 { |
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261 close_diary_file (); |
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262 write_to_diary_file = 0; |
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263 } |
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264 else |
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265 { |
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266 diary_file = arg; |
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267 open_diary_file (); |
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268 } |
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269 } |
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270 break; |
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271 |
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272 default: |
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273 print_usage ("diary"); |
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274 break; |
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275 } |
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276 |
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277 return retval; |
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278 } |
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279 |
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280 DEFUN_TEXT (more, args, , |
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281 "more on\n\ |
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282 more off\n\ |
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283 \n\ |
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284 Turn output pagination on or off.") |
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285 { |
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286 octave_value_list retval; |
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287 |
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288 int argc = args.length () + 1; |
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289 |
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290 string_vector argv = args.make_argv ("more"); |
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291 |
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292 if (error_state) |
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293 return retval; |
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294 |
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295 if (argc == 2) |
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296 { |
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297 string arg = argv[1]; |
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298 |
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299 if (arg == "on") |
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300 bind_builtin_variable ("page_screen_output", "true"); |
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301 else if (arg == "off") |
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302 bind_builtin_variable ("page_screen_output", "false"); |
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303 else |
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304 error ("more: unrecognized argument `%s'", arg.c_str ()); |
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305 } |
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306 else |
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307 print_usage ("more"); |
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308 |
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309 return retval; |
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310 } |
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311 |
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312 static string |
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313 default_pager (void) |
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314 { |
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315 string pager_binary; |
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316 |
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317 char *pgr = getenv ("PAGER"); |
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318 |
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319 if (pgr) |
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320 pager_binary = string (pgr); |
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321 #ifdef DEFAULT_PAGER |
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322 else |
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323 { |
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324 pager_binary = string (DEFAULT_PAGER); |
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325 |
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326 if (pager_binary == "less") |
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327 { |
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328 pager_binary.append (" -e"); |
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329 |
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330 if (! getenv ("LESS")) |
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331 pager_binary.append |
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332 (" -P-- less ?pB(%pB\%):--. (f)orward, (b)ack, (q)uit$"); |
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333 } |
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334 } |
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335 #endif |
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336 |
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337 return pager_binary; |
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338 } |
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339 |
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340 void |
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341 symbols_of_pager (void) |
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342 { |
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343 DEFVAR (PAGER, default_pager (), 0, sv_pager_binary, |
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344 "path to pager binary"); |
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345 |
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346 DEFVAR (page_screen_output, 1.0, 0, page_screen_output, |
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347 "if possible, send output intended for the screen through the pager"); |
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348 } |
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349 |
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350 /* |
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351 ;;; Local Variables: *** |
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352 ;;; mode: C++ *** |
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353 ;;; End: *** |
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354 */ |
