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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 3 of the License, or (at your |
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10 option) any 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, see |
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19 <http://www.gnu.org/licenses/>. |
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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 <fstream> |
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28 #include <string> |
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29 |
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30 #include "cmd-edit.h" |
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31 #include "oct-env.h" |
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32 |
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33 #include "procstream.h" |
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34 |
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2492
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35 #include <defaults.h> |
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36 #include "defun.h" |
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37 #include "error.h" |
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38 #include "gripes.h" |
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39 #include "input.h" |
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40 #include "oct-obj.h" |
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41 #include "pager.h" |
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42 #include "sighandlers.h" |
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43 #include "unwind-prot.h" |
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44 #include "utils.h" |
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2368
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45 #include "variables.h" |
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46 |
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47 // Our actual connection to the external pager. |
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48 static oprocstream *external_pager = 0; |
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49 |
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50 // TRUE means we write to the diary file. |
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51 static bool write_to_diary_file = false; |
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52 |
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53 // The name of the current diary file. |
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54 static std::string diary_file; |
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55 |
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56 // The diary file. |
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57 static std::ofstream external_diary_file; |
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58 |
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59 static std::string |
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60 default_pager (void) |
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61 { |
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62 std::string pager_binary = octave_env::getenv ("PAGER"); |
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63 |
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64 #ifdef OCTAVE_DEFAULT_PAGER |
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65 if (pager_binary.empty ()) |
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66 pager_binary = OCTAVE_DEFAULT_PAGER; |
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67 #endif |
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68 |
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69 return pager_binary; |
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70 } |
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71 |
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72 // The shell command to run as the pager. |
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73 static std::string VPAGER = default_pager (); |
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74 |
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75 // The options to pass to the pager. |
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76 static std::string VPAGER_FLAGS; |
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77 |
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78 // TRUE means that if output is going to the pager, it is sent as soon |
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79 // as it is available. Otherwise, it is buffered and only sent to the |
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80 // pager when it is time to print another prompt. |
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81 static bool Vpage_output_immediately = false; |
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82 |
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83 // TRUE means all output intended for the screen should be passed |
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84 // through the pager. |
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85 static bool Vpage_screen_output = true; |
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86 |
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87 static bool really_flush_to_pager = false; |
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88 |
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89 static bool flushing_output_to_pager = false; |
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90 |
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91 static void |
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92 clear_external_pager (void) |
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93 { |
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94 if (external_pager) |
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95 { |
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96 octave_child_list::remove (external_pager->pid ()); |
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97 |
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98 delete external_pager; |
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99 external_pager = 0; |
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100 } |
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101 } |
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102 |
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103 static bool |
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104 pager_event_handler (pid_t pid, int status) |
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105 { |
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106 bool retval = false; |
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107 |
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108 if (pid > 0) |
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109 { |
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110 if (WIFEXITED (status) || WIFSIGNALLED (status)) |
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111 { |
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112 // Avoid warning() since that will put us back in the pager, |
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113 // which would be bad news. |
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114 |
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115 std::cerr << "warning: connection to external pager lost (pid = " |
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116 << pid << ")" << std::endl; |
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117 std::cerr << "warning: flushing pending output (please wait)" |
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118 << std::endl; |
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119 |
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120 // Request removal of this PID from the list of child |
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121 // processes. |
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122 |
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123 retval = true; |
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124 } |
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125 } |
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126 |
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127 return retval; |
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128 } |
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129 |
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130 static std::string |
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131 pager_command (void) |
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132 { |
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133 std::string cmd = VPAGER; |
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134 |
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135 if (! (cmd.empty () || VPAGER_FLAGS.empty ())) |
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136 cmd += " " + VPAGER_FLAGS; |
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137 |
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138 return cmd; |
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139 } |
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140 |
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141 static void |
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142 do_sync (const char *msg, int len, bool bypass_pager) |
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143 { |
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144 if (msg && len > 0) |
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145 { |
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2206
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146 if (bypass_pager) |
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2646
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147 { |
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148 std::cout.write (msg, len); |
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149 std::cout.flush (); |
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150 } |
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151 else |
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152 { |
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153 if (! external_pager) |
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154 { |
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155 std::string pgr = pager_command (); |
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156 |
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157 if (! pgr.empty ()) |
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158 { |
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159 external_pager = new oprocstream (pgr.c_str ()); |
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160 |
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161 if (external_pager) |
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162 octave_child_list::insert (external_pager->pid (), |
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163 pager_event_handler); |
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164 } |
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165 } |
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166 |
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167 if (external_pager) |
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168 { |
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169 if (external_pager->good ()) |
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170 { |
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171 external_pager->write (msg, len); |
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172 |
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173 external_pager->flush (); |
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174 |
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175 #if defined (EPIPE) |
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176 if (errno == EPIPE) |
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177 external_pager->setstate (std::ios::failbit); |
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178 #endif |
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179 } |
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180 else |
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181 { |
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182 // FIXME -- omething is not right with the |
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183 // pager. If it died then we should receive a |
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184 // signal for that. If there is some other problem, |
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185 // then what? |
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186 } |
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187 } |
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188 else |
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189 { |
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190 std::cout.write (msg, len); |
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191 std::cout.flush (); |
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192 } |
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193 } |
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194 } |
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195 } |
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196 |
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197 // Assume our terminal wraps long lines. |
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198 |
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199 static bool |
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200 more_than_a_screenful (const char *s, int len) |
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201 { |
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202 if (s) |
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203 { |
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204 int available_rows = command_editor::terminal_rows () - 2; |
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205 |
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206 int cols = command_editor::terminal_cols (); |
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207 |
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208 int count = 0; |
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209 |
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210 int chars_this_line = 0; |
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211 |
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212 for (int i = 0; i < len; i++) |
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213 { |
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214 if (*s++ == '\n') |
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215 { |
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216 count += chars_this_line / cols + 1; |
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217 chars_this_line = 0; |
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218 } |
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219 else |
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220 chars_this_line++; |
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221 } |
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222 |
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223 if (count > available_rows) |
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224 return true; |
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225 } |
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226 |
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227 return false; |
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228 } |
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229 |
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230 int |
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231 octave_pager_buf::sync (void) |
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232 { |
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233 if (! interactive |
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234 || really_flush_to_pager |
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235 || (Vpage_screen_output && Vpage_output_immediately) |
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236 || ! Vpage_screen_output) |
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237 { |
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238 char *buf = eback (); |
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239 |
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240 int len = pptr () - buf; |
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241 |
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242 bool bypass_pager = (! interactive |
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243 || ! Vpage_screen_output |
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244 || (really_flush_to_pager |
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245 && Vpage_screen_output |
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246 && ! Vpage_output_immediately |
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247 && ! more_than_a_screenful (buf, len))); |
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248 |
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249 if (len > 0) |
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250 { |
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251 do_sync (buf, len, bypass_pager); |
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252 |
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253 flush_current_contents_to_diary (); |
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254 |
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255 seekoff (0, std::ios::beg); |
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256 } |
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257 } |
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258 |
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259 return 0; |
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260 } |
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261 |
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262 void |
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263 octave_pager_buf::flush_current_contents_to_diary (void) |
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264 { |
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265 char *buf = eback () + diary_skip; |
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266 |
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267 size_t len = pptr () - buf; |
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268 |
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269 octave_diary.write (buf, len); |
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270 |
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271 diary_skip = 0; |
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272 } |
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273 |
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274 void |
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275 octave_pager_buf::set_diary_skip (void) |
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276 { |
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277 diary_skip = pptr () - eback (); |
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278 } |
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279 |
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280 int |
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281 octave_diary_buf::sync (void) |
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282 { |
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283 if (write_to_diary_file && external_diary_file) |
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284 { |
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285 char *buf = eback (); |
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286 |
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287 int len = pptr () - buf; |
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288 |
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289 if (len > 0) |
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290 external_diary_file.write (buf, len); |
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291 } |
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292 |
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293 seekoff (0, std::ios::beg); |
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294 |
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295 return 0; |
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296 } |
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297 |
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298 octave_pager_stream *octave_pager_stream::instance = 0; |
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299 |
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300 octave_pager_stream::octave_pager_stream (void) : std::ostream (0), pb (0) |
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301 { |
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302 pb = new octave_pager_buf (); |
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303 rdbuf (pb); |
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304 setf (unitbuf); |
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305 } |
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306 |
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307 octave_pager_stream::~octave_pager_stream (void) |
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308 { |
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309 flush (); |
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310 delete pb; |
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311 } |
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312 |
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313 octave_pager_stream& |
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314 octave_pager_stream::stream (void) |
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315 { |
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316 if (! instance) |
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317 instance = new octave_pager_stream (); |
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318 |
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319 return *instance; |
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320 } |
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321 |
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3477
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322 void |
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323 octave_pager_stream::flush_current_contents_to_diary (void) |
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324 { |
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325 if (pb) |
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326 pb->flush_current_contents_to_diary (); |
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327 } |
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328 |
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3756
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329 void |
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330 octave_pager_stream::set_diary_skip (void) |
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331 { |
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332 if (pb) |
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333 pb->set_diary_skip (); |
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334 } |
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335 |
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2093
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336 octave_diary_stream *octave_diary_stream::instance = 0; |
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337 |
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3775
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338 octave_diary_stream::octave_diary_stream (void) : std::ostream (0), db (0) |
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2093
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339 { |
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4051
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340 db = new octave_diary_buf (); |
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341 rdbuf (db); |
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342 setf (unitbuf); |
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343 } |
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344 |
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345 octave_diary_stream::~octave_diary_stream (void) |
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346 { |
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347 flush (); |
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348 delete db; |
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349 } |
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350 |
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351 octave_diary_stream& |
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352 octave_diary_stream::stream (void) |
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353 { |
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354 if (! instance) |
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355 instance = new octave_diary_stream (); |
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356 |
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357 return *instance; |
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1
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358 } |
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359 |
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360 void |
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2093
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361 flush_octave_stdout (void) |
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1
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362 { |
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2206
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363 if (! flushing_output_to_pager) |
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364 { |
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2985
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365 unwind_protect::begin_frame ("flush_octave_stdout"); |
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2100
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366 |
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3018
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367 unwind_protect_bool (really_flush_to_pager); |
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368 unwind_protect_bool (flushing_output_to_pager); |
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2100
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369 |
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3018
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370 really_flush_to_pager = true; |
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371 flushing_output_to_pager = true; |
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2206
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372 |
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373 octave_stdout.flush (); |
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1
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374 |
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5142
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375 clear_external_pager (); |
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2100
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376 |
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2985
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377 unwind_protect::run_frame ("flush_octave_stdout"); |
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2206
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378 } |
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1
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379 } |
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380 |
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1965
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381 static void |
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2093
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382 close_diary_file (void) |
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1
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383 { |
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3477
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384 // Try to flush the current buffer to the diary now, so that things |
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385 // like |
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386 // |
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387 // function foo () |
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388 // diary on; |
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389 // ... |
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390 // diary off; |
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391 // endfunction |
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392 // |
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393 // will do the right thing. |
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394 |
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395 octave_stdout.flush_current_contents_to_diary (); |
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396 |
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2093
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397 if (external_diary_file.is_open ()) |
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1
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398 { |
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2093
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399 octave_diary.flush (); |
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400 external_diary_file.close (); |
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1
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401 } |
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402 } |
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403 |
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581
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404 static void |
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405 open_diary_file (void) |
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406 { |
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2093
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407 close_diary_file (); |
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581
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408 |
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3756
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409 // If there is pending output in the pager buf, it should not go |
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410 // into the diary file. |
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411 |
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412 octave_stdout.set_diary_skip (); |
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413 |
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3544
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414 external_diary_file.open (diary_file.c_str (), std::ios::app); |
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581
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415 |
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2093
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416 if (! external_diary_file) |
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417 error ("diary: can't open diary file `%s'", diary_file.c_str ()); |
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581
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418 } |
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419 |
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4208
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420 DEFCMD (diary, args, , |
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3332
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421 "-*- texinfo -*-\n\ |
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422 @deffn {Command} diary options\n\ |
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423 Create a list of all commands @emph{and} the output they produce, mixed\n\ |
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424 together just as you see them on your terminal. Valid options are:\n\ |
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425 \n\ |
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426 @table @code\n\ |
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427 @item on\n\ |
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428 Start recording your session in a file called @file{diary} in your\n\ |
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429 current working directory.\n\ |
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581
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430 \n\ |
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3332
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431 @item off\n\ |
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432 Stop recording your session in the diary file.\n\ |
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433 \n\ |
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434 @item @var{file}\n\ |
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435 Record your session in the file named @var{file}.\n\ |
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436 @end table\n\ |
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437 \n\ |
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438 Without any arguments, @code{diary} toggles the current diary state.\n\ |
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3333
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439 @end deffn") |
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581
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440 { |
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2086
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441 octave_value_list retval; |
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581
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442 |
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1755
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443 int argc = args.length () + 1; |
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444 |
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1965
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445 string_vector argv = args.make_argv ("diary"); |
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581
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446 |
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1755
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447 if (error_state) |
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448 return retval; |
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449 |
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450 if (diary_file.empty ()) |
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451 diary_file = "diary"; |
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1306
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452 |
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581
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453 switch (argc) |
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454 { |
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455 case 1: |
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456 write_to_diary_file = ! write_to_diary_file; |
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457 open_diary_file (); |
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458 break; |
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623
|
459 |
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581
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460 case 2: |
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461 { |
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3523
|
462 std::string arg = argv[1]; |
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1755
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463 |
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464 if (arg == "on") |
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581
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465 { |
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3018
|
466 write_to_diary_file = true; |
|
581
|
467 open_diary_file (); |
|
|
468 } |
|
1755
|
469 else if (arg == "off") |
|
2093
|
470 { |
|
|
471 close_diary_file (); |
|
3018
|
472 write_to_diary_file = false; |
|
2093
|
473 } |
|
581
|
474 else |
|
|
475 { |
|
1755
|
476 diary_file = arg; |
|
3176
|
477 write_to_diary_file = true; |
|
581
|
478 open_diary_file (); |
|
|
479 } |
|
|
480 } |
|
|
481 break; |
|
777
|
482 |
|
581
|
483 default: |
|
5823
|
484 print_usage (); |
|
581
|
485 break; |
|
|
486 } |
|
|
487 |
|
|
488 return retval; |
|
|
489 } |
|
|
490 |
|
4208
|
491 DEFCMD (more, args, , |
|
3372
|
492 "-*- texinfo -*-\n\ |
|
|
493 @deffn {Command} more\n\ |
|
|
494 @deffnx {Command} more on\n\ |
|
|
495 @deffnx {Command} more off\n\ |
|
|
496 Turn output pagination on or off. Without an argument, @code{more}\n\ |
|
|
497 toggles the current state.\n\ |
|
|
498 @end deffn") |
|
1409
|
499 { |
|
2086
|
500 octave_value_list retval; |
|
1409
|
501 |
|
1755
|
502 int argc = args.length () + 1; |
|
|
503 |
|
1965
|
504 string_vector argv = args.make_argv ("more"); |
|
1755
|
505 |
|
|
506 if (error_state) |
|
|
507 return retval; |
|
1409
|
508 |
|
|
509 if (argc == 2) |
|
|
510 { |
|
3523
|
511 std::string arg = argv[1]; |
|
1409
|
512 |
|
1755
|
513 if (arg == "on") |
|
5794
|
514 Vpage_screen_output = true; |
|
1755
|
515 else if (arg == "off") |
|
5794
|
516 Vpage_screen_output = false; |
|
1409
|
517 else |
|
1755
|
518 error ("more: unrecognized argument `%s'", arg.c_str ()); |
|
1409
|
519 } |
|
4324
|
520 else if (argc == 1) |
|
5794
|
521 Vpage_screen_output = ! Vpage_screen_output; |
|
1409
|
522 else |
|
5823
|
523 print_usage (); |
|
1409
|
524 |
|
|
525 return retval; |
|
|
526 } |
|
|
527 |
|
5673
|
528 DEFUN (terminal_size, , , |
|
|
529 "-*- texinfo -*-\n\ |
|
|
530 @deftypefn {Built-in Function} {} terminal_size ()\n\ |
|
|
531 Return a two-element row vector containing the current size of the\n\ |
|
|
532 terminal window in characters (rows and columns).\n\ |
|
5778
|
533 @seealso{list_in_columns}\n\ |
|
5673
|
534 @end deftypefn") |
|
|
535 { |
|
|
536 RowVector size (2, 0.0); |
|
|
537 |
|
|
538 size(0) = command_editor::terminal_rows (); |
|
|
539 size(1) = command_editor::terminal_cols (); |
|
|
540 |
|
|
541 return octave_value (size); |
|
|
542 } |
|
|
543 |
|
5794
|
544 DEFUN (page_output_immediately, args, nargout, |
|
|
545 "-*- texinfo -*-\n\ |
|
|
546 @deftypefn {Built-in Function} {@var{val} =} page_output_immediately ()\n\ |
|
|
547 @deftypefnx {Built-in Function} {@var{val} =} page_output_immediately (@var{new_val})\n\ |
|
|
548 Query or set the internal variable that controls whether Octave sends\n\ |
|
|
549 output to the pager as soon as it is available. Otherwise, Octave\n\ |
|
|
550 buffers its output and waits until just before the prompt is printed to\n\ |
|
|
551 flush it to the pager.\n\ |
|
|
552 @end deftypefn") |
|
2097
|
553 { |
|
5794
|
554 return SET_INTERNAL_VARIABLE (page_output_immediately); |
|
2164
|
555 } |
|
|
556 |
|
5794
|
557 DEFUN (page_screen_output, args, nargout, |
|
|
558 "-*- texinfo -*-\n\ |
|
|
559 @deftypefn {Built-in Function} {@var{val} =} page_screen_output ()\n\ |
|
|
560 @deftypefnx {Built-in Function} {@var{old_val} =} page_screen_output (@var{new_val})\n\ |
|
|
561 Query or set the internal variable that controls whether output intended\n\ |
|
|
562 for the terminal window that is longer than one page is sent through a\n\ |
|
|
563 pager. This allows you to view one screenful at a time. Some pagers\n\ |
|
|
564 (such as @code{less}---see @ref{Installation}) are also capable of moving\n\ |
|
|
565 backward on the output.\n\ |
|
|
566 @end deftypefn") |
|
2164
|
567 { |
|
5794
|
568 return SET_INTERNAL_VARIABLE (page_screen_output); |
|
2164
|
569 } |
|
|
570 |
|
5794
|
571 DEFUN (PAGER, args, nargout, |
|
|
572 "-*- texinfo -*-\n\ |
|
|
573 @deftypefn {Built-in Function} {@var{val} =} PAGER ()\n\ |
|
|
574 @deftypefnx {Built-in Function} {@var{old_val} =} PAGER (@var{new_val})\n\ |
|
|
575 Query or set the internal variable that specifies the program to use\n\ |
|
|
576 to display terminal output on your system. The default value is\n\ |
|
|
577 normally @code{\"less\"}, @code{\"more\"}, or\n\ |
|
3372
|
578 @code{\"pg\"}, depending on what programs are installed on your system.\n\ |
|
|
579 @xref{Installation}.\n\ |
|
6144
|
580 @seealso{more, page_screen_output, page_output_immediately, PAGER_FLAGS}\n\ |
|
5794
|
581 @end deftypefn") |
|
|
582 { |
|
|
583 return SET_NONEMPTY_INTERNAL_STRING_VARIABLE (PAGER); |
|
2097
|
584 } |
|
|
585 |
|
6144
|
586 DEFUN (PAGER_FLAGS, args, nargout, |
|
|
587 "-*- texinfo -*-\n\ |
|
|
588 @deftypefn {Built-in Function} {@var{val} =} PAGER_FLAGS ()\n\ |
|
|
589 @deftypefnx {Built-in Function} {@var{old_val} =} PAGER_FLAGS (@var{new_val})\n\ |
|
|
590 Query or set the internal variable that specifies the options to pass\n\ |
|
|
591 to the pager.\n\ |
|
|
592 @seealso{PAGER}\n\ |
|
|
593 @end deftypefn") |
|
|
594 { |
|
|
595 return SET_NONEMPTY_INTERNAL_STRING_VARIABLE (PAGER_FLAGS); |
|
|
596 } |
|
|
597 |
|
1
|
598 /* |
|
|
599 ;;; Local Variables: *** |
|
|
600 ;;; mode: C++ *** |
|
|
601 ;;; End: *** |
|
|
602 */ |
