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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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1343
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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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581
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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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2098
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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 "user-prefs.h" |
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42 |
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43 pid_t octave_pager_pid = -1; |
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44 |
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45 // Our actual connection to the external pager. |
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46 static oprocstream *external_pager = 0; |
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47 |
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48 // Nonzero means we write to the diary file. |
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49 static int write_to_diary_file = 0; |
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50 |
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51 // The name of the current diary file. |
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52 static string diary_file; |
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53 |
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54 // The diary file. |
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55 static ofstream external_diary_file; |
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56 |
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57 static sig_handler *saved_sigint_handler = 0; |
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58 |
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59 static void |
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60 do_sync (const char *msg) |
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61 { |
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62 if (! error_state) |
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63 { |
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64 if (msg && *msg) |
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65 { |
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66 if (! external_pager) |
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67 { |
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68 string pgr = user_pref.pager_binary; |
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69 |
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70 if (! pgr.empty ()) |
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71 { |
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72 saved_sigint_handler |
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73 = octave_set_signal_handler (SIGINT, SIG_IGN); |
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74 |
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75 external_pager = new oprocstream (pgr.c_str ()); |
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76 |
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77 if (external_pager) |
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78 octave_pager_pid = external_pager->pid (); |
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79 } |
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80 } |
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81 |
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82 if (external_pager) |
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83 { |
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84 *external_pager << msg; |
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85 |
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86 if (external_pager->fail ()) |
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87 { |
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88 octave_pager_pid = -1; |
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89 |
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90 delete external_pager; |
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91 external_pager = 0; |
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92 |
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93 if (saved_sigint_handler) |
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94 { |
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95 octave_set_signal_handler (SIGINT, saved_sigint_handler); |
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96 saved_sigint_handler = 0; |
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97 } |
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98 } |
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99 else |
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100 external_pager->flush (); |
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101 } |
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102 else |
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103 cout << msg; |
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104 } |
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105 } |
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106 } |
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107 |
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108 int |
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109 octave_pager_buf::sync (void) |
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110 { |
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111 sputc ('\0'); |
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112 |
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113 char *buf = eback (); |
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114 |
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115 do_sync (buf); |
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116 |
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117 octave_diary << buf; |
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118 |
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119 seekoff (0, ios::beg); |
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120 |
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121 return 0; |
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122 } |
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123 |
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124 int |
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125 octave_diary_buf::sync (void) |
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126 { |
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127 sputc ('\0'); |
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128 |
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129 if (write_to_diary_file && external_diary_file) |
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130 external_diary_file << eback (); |
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131 |
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132 seekoff (0, ios::beg); |
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133 |
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134 return 0; |
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135 } |
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136 |
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137 octave_pager_stream *octave_pager_stream::instance = 0; |
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138 |
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139 octave_pager_stream::octave_pager_stream (void) : ostream (), pb (0) |
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140 { |
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141 pb = new octave_pager_buf; |
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142 rdbuf (pb); |
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143 setf (unitbuf); |
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144 } |
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145 |
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146 octave_pager_stream::~octave_pager_stream (void) |
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147 { |
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148 flush (); |
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149 delete pb; |
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150 } |
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151 |
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152 octave_pager_stream& |
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153 octave_pager_stream::stream (void) |
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154 { |
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155 if (! instance) |
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156 instance = new octave_pager_stream (); |
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157 |
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158 return *instance; |
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159 } |
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160 |
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161 octave_diary_stream *octave_diary_stream::instance = 0; |
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162 |
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163 octave_diary_stream::octave_diary_stream (void) : ostream (), db (0) |
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164 { |
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165 db = new octave_diary_buf; |
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166 rdbuf (db); |
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167 setf (unitbuf); |
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168 } |
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169 |
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170 octave_diary_stream::~octave_diary_stream (void) |
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171 { |
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172 flush (); |
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173 delete db; |
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174 } |
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175 |
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176 octave_diary_stream& |
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177 octave_diary_stream::stream (void) |
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178 { |
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179 if (! instance) |
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180 instance = new octave_diary_stream (); |
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181 |
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182 return *instance; |
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183 } |
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184 |
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185 void |
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186 flush_octave_stdout (void) |
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187 { |
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188 octave_stdout.flush (); |
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189 |
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190 if (external_pager) |
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191 { |
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192 octave_pager_pid = -1; |
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193 |
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194 delete external_pager; |
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195 external_pager = 0; |
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196 |
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197 if (saved_sigint_handler) |
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198 { |
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199 octave_set_signal_handler (SIGINT, saved_sigint_handler); |
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200 saved_sigint_handler = 0; |
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201 } |
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202 } |
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203 } |
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204 |
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205 static void |
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206 close_diary_file (void) |
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207 { |
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208 if (external_diary_file.is_open ()) |
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209 { |
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210 octave_diary.flush (); |
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211 external_diary_file.close (); |
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212 } |
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213 } |
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214 |
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215 static void |
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216 open_diary_file (void) |
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217 { |
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218 close_diary_file (); |
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219 |
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220 external_diary_file.open (diary_file.c_str (), ios::app); |
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221 |
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222 if (! external_diary_file) |
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223 error ("diary: can't open diary file `%s'", diary_file.c_str ()); |
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224 } |
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225 |
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226 DEFUN_TEXT (diary, args, , |
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227 "diary [on|off]\n\ |
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228 diary [file]\n\ |
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229 \n\ |
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230 redirect all input and screen output to a file.") |
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231 { |
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232 octave_value_list retval; |
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233 |
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234 int argc = args.length () + 1; |
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235 |
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236 string_vector argv = args.make_argv ("diary"); |
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237 |
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238 if (error_state) |
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239 return retval; |
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240 |
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241 if (diary_file.empty ()) |
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242 diary_file = "diary"; |
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243 |
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244 switch (argc) |
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245 { |
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246 case 1: |
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247 write_to_diary_file = ! write_to_diary_file; |
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248 open_diary_file (); |
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249 break; |
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250 |
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251 case 2: |
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252 { |
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253 string arg = argv[1]; |
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254 |
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255 if (arg == "on") |
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256 { |
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257 write_to_diary_file = 1; |
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258 open_diary_file (); |
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259 } |
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260 else if (arg == "off") |
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261 { |
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262 close_diary_file (); |
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263 write_to_diary_file = 0; |
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264 } |
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265 else |
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266 { |
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267 diary_file = arg; |
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268 open_diary_file (); |
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269 } |
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270 } |
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271 break; |
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272 |
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273 default: |
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274 print_usage ("diary"); |
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275 break; |
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276 } |
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277 |
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278 return retval; |
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279 } |
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280 |
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281 DEFUN_TEXT (more, args, , |
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282 "more on\n\ |
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283 more off\n\ |
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284 \n\ |
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285 Turn output pagination on or off.") |
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286 { |
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287 octave_value_list retval; |
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288 |
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289 int argc = args.length () + 1; |
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290 |
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291 string_vector argv = args.make_argv ("more"); |
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292 |
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293 if (error_state) |
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294 return retval; |
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295 |
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296 if (argc == 2) |
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297 { |
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298 string arg = argv[1]; |
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299 |
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300 if (arg == "on") |
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301 bind_builtin_variable ("page_screen_output", "true"); |
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302 else if (arg == "off") |
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303 bind_builtin_variable ("page_screen_output", "false"); |
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304 else |
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305 error ("more: unrecognized argument `%s'", arg.c_str ()); |
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306 } |
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307 else |
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308 print_usage ("more"); |
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309 |
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310 return retval; |
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311 } |
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312 |
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313 static string |
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314 default_pager (void) |
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315 { |
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316 string pager_binary; |
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317 |
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318 char *pgr = getenv ("PAGER"); |
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319 |
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320 if (pgr) |
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321 pager_binary = string (pgr); |
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322 #ifdef DEFAULT_PAGER |
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323 else |
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324 { |
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325 pager_binary = string (DEFAULT_PAGER); |
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326 |
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327 if (pager_binary == "less") |
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328 { |
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329 pager_binary.append (" -e"); |
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330 |
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331 if (! getenv ("LESS")) |
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332 pager_binary.append |
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333 (" -P-- less ?pB(%pB\%):--. (f)orward, (b)ack, (q)uit$"); |
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334 } |
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335 } |
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336 #endif |
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337 |
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338 return pager_binary; |
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339 } |
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340 |
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341 void |
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342 symbols_of_pager (void) |
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343 { |
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344 DEFVAR (PAGER, default_pager (), 0, sv_pager_binary, |
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345 "path to pager binary"); |
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346 |
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347 DEFVAR (page_screen_output, 1.0, 0, page_screen_output, |
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348 "if possible, send output intended for the screen through the pager"); |
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349 } |
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350 |
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351 /* |
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352 ;;; Local Variables: *** |
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353 ;;; mode: C++ *** |
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354 ;;; End: *** |
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355 */ |
