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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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1192
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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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2101
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32 #include "oct-term.h" |
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33 |
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34 #include "procstream.h" |
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35 |
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2098
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36 #include "defaults.h" |
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37 #include "defun.h" |
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38 #include "error.h" |
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39 #include "help.h" |
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2110
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40 #include "input.h" |
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1755
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41 #include "oct-obj.h" |
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1352
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42 #include "pager.h" |
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43 #include "sighandlers.h" |
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44 #include "unwind-prot.h" |
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45 #include "user-prefs.h" |
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46 |
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47 pid_t octave_pager_pid = -1; |
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48 |
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49 // Our actual connection to the external pager. |
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50 static oprocstream *external_pager = 0; |
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51 |
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52 // Nonzero means we write to the diary file. |
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53 static int write_to_diary_file = 0; |
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54 |
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55 // The name of the current diary file. |
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56 static string diary_file; |
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57 |
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58 // The diary file. |
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59 static ofstream external_diary_file; |
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60 |
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61 static sig_handler *saved_sigint_handler = 0; |
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62 |
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63 static int really_flush_to_pager = 0; |
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64 |
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65 static void |
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66 do_sync (const char *msg, bool bypass_pager) |
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67 { |
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68 if (! error_state) |
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69 { |
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70 if (msg && *msg) |
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71 { |
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2101
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72 if (bypass_pager) |
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73 cout << msg; |
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74 else |
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75 { |
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2101
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76 if (! external_pager) |
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77 { |
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78 string pgr = user_pref.pager_binary; |
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79 |
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80 if (! pgr.empty ()) |
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81 { |
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82 saved_sigint_handler |
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83 = octave_set_signal_handler (SIGINT, SIG_IGN); |
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84 |
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85 external_pager = new oprocstream (pgr.c_str ()); |
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86 |
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2101
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87 if (external_pager) |
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88 octave_pager_pid = external_pager->pid (); |
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89 } |
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90 } |
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91 |
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92 if (external_pager) |
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93 { |
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94 *external_pager << msg; |
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95 |
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96 if (external_pager->fail ()) |
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97 { |
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98 octave_pager_pid = -1; |
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99 |
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100 delete external_pager; |
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101 external_pager = 0; |
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102 |
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103 if (saved_sigint_handler) |
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104 { |
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105 octave_set_signal_handler (SIGINT, |
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106 saved_sigint_handler); |
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107 saved_sigint_handler = 0; |
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108 } |
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109 } |
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110 else |
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111 external_pager->flush (); |
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112 } |
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113 else |
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114 cout << msg; |
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115 } |
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116 } |
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117 } |
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118 } |
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119 |
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120 static bool |
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121 more_than_a_screenful (const char *s) |
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122 { |
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123 if (s) |
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124 { |
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125 int available_rows = terminal_rows () - 2; |
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126 |
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127 int count = 0; |
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128 |
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2101
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129 char c; |
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130 |
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131 while ((c = *s++) != '\0') |
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132 if (c == '\n') |
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133 { |
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134 count++; |
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135 |
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136 if (count > available_rows) |
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137 return true; |
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138 } |
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139 } |
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140 |
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141 return false; |
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142 } |
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143 |
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144 int |
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145 octave_pager_buf::sync (void) |
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146 { |
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2120
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147 bool page_output = user_pref.page_screen_output; |
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148 bool page_immediately = user_pref.page_output_immediately; |
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149 |
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2100
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150 if (really_flush_to_pager |
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151 || (page_output && page_immediately) |
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152 || ! page_output) |
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2100
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153 { |
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154 sputc ('\0'); |
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155 |
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2100
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156 char *buf = eback (); |
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157 |
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158 bool bypass_pager = (! interactive |
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2120
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159 || ! page_output |
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2110
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160 || (really_flush_to_pager |
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161 && page_output |
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162 && ! page_immediately |
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163 && ! more_than_a_screenful (buf))); |
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164 |
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165 do_sync (buf, bypass_pager); |
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166 |
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167 octave_diary << buf; |
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168 |
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169 seekoff (0, ios::beg); |
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170 } |
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171 |
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172 return 0; |
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173 } |
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174 |
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175 int |
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176 octave_diary_buf::sync (void) |
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177 { |
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178 sputc ('\0'); |
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179 |
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180 if (write_to_diary_file && external_diary_file) |
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181 external_diary_file << eback (); |
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182 |
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183 seekoff (0, ios::beg); |
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184 |
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185 return 0; |
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186 } |
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187 |
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188 octave_pager_stream *octave_pager_stream::instance = 0; |
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189 |
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190 octave_pager_stream::octave_pager_stream (void) : ostream (), pb (0) |
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191 { |
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192 pb = new octave_pager_buf; |
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193 rdbuf (pb); |
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194 setf (unitbuf); |
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195 } |
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196 |
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197 octave_pager_stream::~octave_pager_stream (void) |
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198 { |
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199 flush (); |
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200 delete pb; |
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201 } |
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202 |
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203 octave_pager_stream& |
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204 octave_pager_stream::stream (void) |
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205 { |
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206 if (! instance) |
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207 instance = new octave_pager_stream (); |
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208 |
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209 return *instance; |
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210 } |
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211 |
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212 octave_diary_stream *octave_diary_stream::instance = 0; |
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213 |
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214 octave_diary_stream::octave_diary_stream (void) : ostream (), db (0) |
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215 { |
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216 db = new octave_diary_buf; |
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217 rdbuf (db); |
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218 setf (unitbuf); |
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219 } |
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220 |
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221 octave_diary_stream::~octave_diary_stream (void) |
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222 { |
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223 flush (); |
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224 delete db; |
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225 } |
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226 |
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227 octave_diary_stream& |
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228 octave_diary_stream::stream (void) |
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229 { |
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230 if (! instance) |
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231 instance = new octave_diary_stream (); |
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232 |
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233 return *instance; |
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234 } |
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235 |
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236 void |
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237 flush_octave_stdout (void) |
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238 { |
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239 begin_unwind_frame ("flush_octave_stdout"); |
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240 |
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241 unwind_protect_int (really_flush_to_pager); |
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242 |
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243 really_flush_to_pager = 1; |
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244 |
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245 octave_stdout.flush (); |
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246 |
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247 if (external_pager) |
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248 { |
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249 octave_pager_pid = -1; |
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250 |
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251 delete external_pager; |
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252 external_pager = 0; |
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253 |
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254 if (saved_sigint_handler) |
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255 { |
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256 octave_set_signal_handler (SIGINT, saved_sigint_handler); |
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257 saved_sigint_handler = 0; |
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258 } |
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259 } |
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2100
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260 |
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261 run_unwind_frame ("flush_octave_stdout"); |
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262 } |
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263 |
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264 static void |
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265 close_diary_file (void) |
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266 { |
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267 if (external_diary_file.is_open ()) |
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268 { |
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269 octave_diary.flush (); |
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270 external_diary_file.close (); |
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271 } |
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272 } |
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273 |
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274 static void |
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275 open_diary_file (void) |
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276 { |
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277 close_diary_file (); |
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278 |
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279 external_diary_file.open (diary_file.c_str (), ios::app); |
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280 |
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281 if (! external_diary_file) |
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282 error ("diary: can't open diary file `%s'", diary_file.c_str ()); |
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283 } |
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284 |
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285 DEFUN_TEXT (diary, args, , |
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286 "diary [on|off]\n\ |
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287 diary [file]\n\ |
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288 \n\ |
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289 redirect all input and screen output to a file.") |
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290 { |
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291 octave_value_list retval; |
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292 |
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293 int argc = args.length () + 1; |
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294 |
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295 string_vector argv = args.make_argv ("diary"); |
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296 |
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297 if (error_state) |
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298 return retval; |
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299 |
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300 if (diary_file.empty ()) |
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301 diary_file = "diary"; |
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302 |
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303 switch (argc) |
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304 { |
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305 case 1: |
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306 write_to_diary_file = ! write_to_diary_file; |
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307 open_diary_file (); |
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308 break; |
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309 |
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310 case 2: |
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311 { |
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312 string arg = argv[1]; |
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313 |
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314 if (arg == "on") |
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315 { |
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316 write_to_diary_file = 1; |
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317 open_diary_file (); |
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318 } |
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319 else if (arg == "off") |
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320 { |
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321 close_diary_file (); |
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322 write_to_diary_file = 0; |
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323 } |
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324 else |
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325 { |
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326 diary_file = arg; |
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327 open_diary_file (); |
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328 } |
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329 } |
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330 break; |
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331 |
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332 default: |
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333 print_usage ("diary"); |
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334 break; |
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335 } |
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336 |
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337 return retval; |
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338 } |
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339 |
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1957
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340 DEFUN_TEXT (more, args, , |
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341 "more on\n\ |
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342 more off\n\ |
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343 \n\ |
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344 Turn output pagination on or off.") |
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345 { |
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346 octave_value_list retval; |
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347 |
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348 int argc = args.length () + 1; |
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349 |
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350 string_vector argv = args.make_argv ("more"); |
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351 |
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352 if (error_state) |
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353 return retval; |
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354 |
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355 if (argc == 2) |
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356 { |
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357 string arg = argv[1]; |
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358 |
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359 if (arg == "on") |
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360 bind_builtin_variable ("page_screen_output", "true"); |
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361 else if (arg == "off") |
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362 bind_builtin_variable ("page_screen_output", "false"); |
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363 else |
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364 error ("more: unrecognized argument `%s'", arg.c_str ()); |
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365 } |
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366 else |
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367 print_usage ("more"); |
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368 |
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369 return retval; |
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370 } |
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371 |
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372 static string |
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373 default_pager (void) |
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374 { |
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375 string pager_binary; |
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376 |
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377 char *pgr = getenv ("PAGER"); |
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378 |
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379 if (pgr) |
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380 pager_binary = string (pgr); |
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381 #ifdef DEFAULT_PAGER |
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382 else |
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383 { |
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384 pager_binary = string (DEFAULT_PAGER); |
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385 |
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386 if (pager_binary == "less") |
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387 { |
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388 pager_binary.append (" -e"); |
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389 |
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390 if (! getenv ("LESS")) |
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391 pager_binary.append |
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392 (" -P'-- less ?pB(%pB\\%):--. (f)orward, (b)ack, (q)uit$'"); |
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393 } |
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394 } |
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395 #endif |
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396 |
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397 return pager_binary; |
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398 } |
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399 |
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400 void |
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401 symbols_of_pager (void) |
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402 { |
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403 DEFVAR (PAGER, default_pager (), 0, sv_pager_binary, |
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404 "path to pager binary"); |
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405 |
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2146
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406 DEFVAR (page_output_immediately, 0.0, 0, page_output_immediately, |
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2102
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407 "if paging output, start sending it as soon as it is available"); |
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2100
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408 |
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2097
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409 DEFVAR (page_screen_output, 1.0, 0, page_screen_output, |
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410 "if possible, send output intended for the screen through the pager"); |
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411 } |
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412 |
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413 /* |
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414 ;;; Local Variables: *** |
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415 ;;; mode: C++ *** |
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416 ;;; End: *** |
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417 */ |
