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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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1315
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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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1
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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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1
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34 #include "procstream.h" |
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35 |
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2492
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36 #include <defaults.h> |
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1352
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37 #include "defun.h" |
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38 #include "error.h" |
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2164
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39 #include "gripes.h" |
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1352
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40 #include "help.h" |
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2110
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41 #include "input.h" |
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1755
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42 #include "oct-obj.h" |
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1352
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43 #include "pager.h" |
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990
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44 #include "sighandlers.h" |
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2100
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45 #include "unwind-prot.h" |
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2201
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46 #include "utils.h" |
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2368
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47 #include "variables.h" |
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2093
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48 |
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2209
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49 static pid_t octave_pager_pid = -1; |
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1
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50 |
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2093
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51 // Our actual connection to the external pager. |
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52 static oprocstream *external_pager = 0; |
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1
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53 |
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581
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54 // Nonzero means we write to the diary file. |
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55 static int write_to_diary_file = 0; |
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56 |
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57 // The name of the current diary file. |
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1755
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58 static string diary_file; |
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581
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59 |
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60 // The diary file. |
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2093
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61 static ofstream external_diary_file; |
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581
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62 |
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2164
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63 // The shell command to run as the pager. |
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64 static string Vpager_binary; |
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65 |
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66 // TRUE means that if output is going to the pager, it is sent as soon |
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67 // as it is available. Otherwise, it is buffered and only sent to the |
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68 // pager when it is time to print another prompt. |
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69 static bool Vpage_output_immediately; |
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70 |
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71 // TRUE means all output intended for the screen should be passed |
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72 // through the pager. |
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73 static bool Vpage_screen_output; |
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74 |
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2554
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75 static octave_interrupt_handler *saved_interrupt_handler = 0; |
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2093
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76 |
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2100
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77 static int really_flush_to_pager = 0; |
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78 |
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2206
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79 static int flushing_output_to_pager = 0; |
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80 |
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2093
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81 static void |
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2197
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82 clear_external_pager (void) |
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83 { |
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2210
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84 octave_child_list::remove (octave_pager_pid); |
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85 |
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2197
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86 octave_pager_pid = -1; |
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87 |
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88 delete external_pager; |
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89 external_pager = 0; |
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90 |
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2554
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91 if (saved_interrupt_handler) |
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2197
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92 { |
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2554
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93 octave_set_interrupt_handler (saved_interrupt_handler); |
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94 saved_interrupt_handler = 0; |
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2197
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95 } |
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96 } |
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97 |
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98 static void |
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2209
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99 pager_death_handler (pid_t pid, int status) |
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100 { |
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101 if (pid > 0) |
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102 { |
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103 if (WIFEXITED (status) || WIFSIGNALLED (status)) |
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104 { |
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2475
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105 if (external_pager) |
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106 clear_external_pager (); |
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2209
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107 |
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108 // Don't call error() here because we don't want to set |
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109 // the error state. |
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110 |
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2475
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111 // XXX FIXME XXX -- something is wrong with the way that |
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112 // we are cleaning up the pager in the event of a SIGCHLD. |
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113 // If this message is printed with warning(), we eventually |
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114 // crash. |
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115 |
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2476
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116 cout << "warning: connection to external pager (pid = " |
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117 << pid << ") lost --" << endl |
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118 << "warning: pending computations and output may be lost" |
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119 << endl; |
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2209
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120 } |
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121 } |
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122 } |
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123 |
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124 static void |
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2101
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125 do_sync (const char *msg, bool bypass_pager) |
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1
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126 { |
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2206
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127 if (msg && *msg) |
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1
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128 { |
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2206
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129 if (bypass_pager) |
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130 cout << msg; |
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131 else |
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2093
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132 { |
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2206
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133 if (! external_pager) |
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2093
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134 { |
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2206
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135 string pgr = Vpager_binary; |
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2093
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136 |
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2206
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137 if (! pgr.empty ()) |
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138 { |
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2554
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139 saved_interrupt_handler = octave_ignore_interrupts (); |
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2093
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140 |
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2206
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141 external_pager = new oprocstream (pgr.c_str ()); |
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2093
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142 |
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2206
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143 if (external_pager) |
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2209
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144 { |
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145 octave_pager_pid = external_pager->pid (); |
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146 |
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147 octave_child_list::insert (octave_pager_pid, |
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148 pager_death_handler); |
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149 } |
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2093
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150 } |
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2206
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151 } |
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2101
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152 |
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2206
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153 if (external_pager) |
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154 { |
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155 if (octave_pager_pid > 0 && external_pager->good ()) |
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2101
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156 { |
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2206
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157 *external_pager << msg; |
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2101
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158 |
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2206
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159 // These checks are needed if a signal handler |
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160 // invoked since the last set of checks attempts |
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161 // to flush output and then returns |
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2197
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162 |
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2206
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163 if (octave_pager_pid > 0 |
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164 && external_pager |
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165 && external_pager->good ()) |
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166 external_pager->flush (); |
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2101
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167 } |
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2093
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168 } |
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2206
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169 else |
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170 cout << msg; |
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2093
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171 } |
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1
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172 } |
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173 } |
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174 |
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2101
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175 static bool |
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176 more_than_a_screenful (const char *s) |
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177 { |
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178 if (s) |
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179 { |
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180 int available_rows = terminal_rows () - 2; |
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181 |
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2103
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182 int count = 0; |
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183 |
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2101
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184 char c; |
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185 |
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186 while ((c = *s++) != '\0') |
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187 if (c == '\n') |
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188 { |
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189 count++; |
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190 |
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191 if (count > available_rows) |
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192 return true; |
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193 } |
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194 } |
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195 |
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196 return false; |
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197 } |
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198 |
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2093
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199 int |
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200 octave_pager_buf::sync (void) |
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201 { |
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2186
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202 if (! interactive |
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203 || really_flush_to_pager |
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2164
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204 || (Vpage_screen_output && Vpage_output_immediately) |
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205 || ! Vpage_screen_output) |
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2100
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206 { |
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207 sputc ('\0'); |
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2093
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208 |
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2100
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209 char *buf = eback (); |
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210 |
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2110
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211 bool bypass_pager = (! interactive |
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2164
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212 || ! Vpage_screen_output |
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2110
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213 || (really_flush_to_pager |
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2164
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214 && Vpage_screen_output |
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215 && ! Vpage_output_immediately |
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2110
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216 && ! more_than_a_screenful (buf))); |
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2101
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217 |
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2475
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218 seekoff (0, ios::beg); |
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219 |
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2101
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220 do_sync (buf, bypass_pager); |
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2093
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221 |
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2100
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222 octave_diary << buf; |
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223 } |
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2093
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224 |
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225 return 0; |
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226 } |
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227 |
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228 int |
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229 octave_diary_buf::sync (void) |
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230 { |
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231 sputc ('\0'); |
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232 |
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233 if (write_to_diary_file && external_diary_file) |
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234 external_diary_file << eback (); |
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235 |
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236 seekoff (0, ios::beg); |
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237 |
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238 return 0; |
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239 } |
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240 |
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241 octave_pager_stream *octave_pager_stream::instance = 0; |
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242 |
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243 octave_pager_stream::octave_pager_stream (void) : ostream (), pb (0) |
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1
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244 { |
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2093
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245 pb = new octave_pager_buf; |
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246 rdbuf (pb); |
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247 setf (unitbuf); |
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248 } |
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249 |
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250 octave_pager_stream::~octave_pager_stream (void) |
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251 { |
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252 flush (); |
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253 delete pb; |
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254 } |
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255 |
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256 octave_pager_stream& |
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257 octave_pager_stream::stream (void) |
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258 { |
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259 if (! instance) |
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260 instance = new octave_pager_stream (); |
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261 |
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262 return *instance; |
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263 } |
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264 |
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265 octave_diary_stream *octave_diary_stream::instance = 0; |
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266 |
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267 octave_diary_stream::octave_diary_stream (void) : ostream (), db (0) |
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268 { |
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269 db = new octave_diary_buf; |
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270 rdbuf (db); |
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271 setf (unitbuf); |
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272 } |
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273 |
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274 octave_diary_stream::~octave_diary_stream (void) |
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275 { |
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276 flush (); |
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277 delete db; |
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278 } |
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279 |
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280 octave_diary_stream& |
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281 octave_diary_stream::stream (void) |
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282 { |
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283 if (! instance) |
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284 instance = new octave_diary_stream (); |
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285 |
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286 return *instance; |
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1
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287 } |
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288 |
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289 void |
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2093
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290 flush_octave_stdout (void) |
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1
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291 { |
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2206
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292 if (! flushing_output_to_pager) |
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293 { |
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294 begin_unwind_frame ("flush_octave_stdout"); |
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2100
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295 |
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2206
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296 unwind_protect_int (really_flush_to_pager); |
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297 unwind_protect_int (flushing_output_to_pager); |
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2100
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298 |
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2206
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299 really_flush_to_pager = 1; |
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300 flushing_output_to_pager = 1; |
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301 |
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302 octave_stdout.flush (); |
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1
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303 |
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2206
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304 if (external_pager) |
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305 clear_external_pager (); |
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2100
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306 |
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2206
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307 run_unwind_frame ("flush_octave_stdout"); |
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308 } |
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1
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309 } |
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310 |
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1965
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311 static void |
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2093
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312 close_diary_file (void) |
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1
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313 { |
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2093
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314 if (external_diary_file.is_open ()) |
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1
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315 { |
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2093
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316 octave_diary.flush (); |
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317 external_diary_file.close (); |
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1
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318 } |
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319 } |
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320 |
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581
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321 static void |
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322 open_diary_file (void) |
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323 { |
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2093
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324 close_diary_file (); |
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581
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325 |
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2093
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326 external_diary_file.open (diary_file.c_str (), ios::app); |
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581
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327 |
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2093
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328 if (! external_diary_file) |
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329 error ("diary: can't open diary file `%s'", diary_file.c_str ()); |
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581
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330 } |
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331 |
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1957
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332 DEFUN_TEXT (diary, args, , |
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581
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333 "diary [on|off]\n\ |
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334 diary [file]\n\ |
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335 \n\ |
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336 redirect all input and screen output to a file.") |
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337 { |
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2086
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338 octave_value_list retval; |
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581
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339 |
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1755
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340 int argc = args.length () + 1; |
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341 |
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1965
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342 string_vector argv = args.make_argv ("diary"); |
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581
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343 |
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1755
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344 if (error_state) |
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345 return retval; |
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346 |
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347 if (diary_file.empty ()) |
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348 diary_file = "diary"; |
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1306
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349 |
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581
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350 switch (argc) |
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351 { |
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352 case 1: |
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353 write_to_diary_file = ! write_to_diary_file; |
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354 open_diary_file (); |
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355 break; |
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623
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356 |
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581
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357 case 2: |
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358 { |
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1755
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359 string arg = argv[1]; |
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360 |
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361 if (arg == "on") |
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581
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362 { |
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363 write_to_diary_file = 1; |
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364 open_diary_file (); |
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365 } |
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1755
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366 else if (arg == "off") |
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2093
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367 { |
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368 close_diary_file (); |
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369 write_to_diary_file = 0; |
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370 } |
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581
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371 else |
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372 { |
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1755
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373 diary_file = arg; |
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581
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374 open_diary_file (); |
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375 } |
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376 } |
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377 break; |
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777
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378 |
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581
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379 default: |
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380 print_usage ("diary"); |
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381 break; |
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382 } |
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383 |
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384 return retval; |
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385 } |
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386 |
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1957
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387 DEFUN_TEXT (more, args, , |
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1409
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388 "more on\n\ |
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389 more off\n\ |
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390 \n\ |
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391 Turn output pagination on or off.") |
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392 { |
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2086
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393 octave_value_list retval; |
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1409
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394 |
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1755
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395 int argc = args.length () + 1; |
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396 |
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1965
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397 string_vector argv = args.make_argv ("more"); |
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1755
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398 |
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399 if (error_state) |
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400 return retval; |
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1409
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401 |
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402 if (argc == 2) |
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403 { |
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1755
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404 string arg = argv[1]; |
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1409
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405 |
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1755
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406 if (arg == "on") |
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2448
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407 bind_builtin_variable ("page_screen_output", 1.0); |
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1755
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408 else if (arg == "off") |
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2448
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409 bind_builtin_variable ("page_screen_output", 0.0); |
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1409
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410 else |
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1755
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411 error ("more: unrecognized argument `%s'", arg.c_str ()); |
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1409
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412 } |
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413 else |
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414 print_usage ("more"); |
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415 |
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416 return retval; |
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417 } |
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418 |
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2097
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419 static string |
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420 default_pager (void) |
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421 { |
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422 string pager_binary; |
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423 |
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424 char *pgr = getenv ("PAGER"); |
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425 |
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426 if (pgr) |
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427 pager_binary = string (pgr); |
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428 #ifdef DEFAULT_PAGER |
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429 else |
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430 { |
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431 pager_binary = string (DEFAULT_PAGER); |
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432 |
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433 if (pager_binary == "less") |
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434 { |
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435 pager_binary.append (" -e"); |
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436 |
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437 if (! getenv ("LESS")) |
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438 pager_binary.append |
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2099
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439 (" -P'-- less ?pB(%pB\\%):--. (f)orward, (b)ack, (q)uit$'"); |
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2097
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440 } |
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441 } |
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442 #endif |
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443 |
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444 return pager_binary; |
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445 } |
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446 |
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2164
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447 static int |
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448 pager_binary (void) |
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449 { |
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450 int status = 0; |
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451 |
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452 string s = builtin_string_variable ("PAGER"); |
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453 |
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454 if (s.empty ()) |
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455 { |
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456 gripe_invalid_value_specified ("PAGER"); |
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457 status = -1; |
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458 } |
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459 else |
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460 Vpager_binary = s; |
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461 |
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462 return status; |
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463 } |
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464 |
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465 static int |
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466 page_output_immediately (void) |
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467 { |
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468 Vpage_output_immediately = check_preference ("page_output_immediately"); |
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469 |
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470 return 0; |
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471 } |
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472 |
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473 static int |
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474 page_screen_output (void) |
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475 { |
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476 Vpage_screen_output = check_preference ("page_screen_output"); |
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477 |
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478 return 0; |
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479 } |
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480 |
|
2097
|
481 void |
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|
482 symbols_of_pager (void) |
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483 { |
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2164
|
484 DEFVAR (PAGER, default_pager (), 0, pager_binary, |
|
2097
|
485 "path to pager binary"); |
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|
486 |
|
2146
|
487 DEFVAR (page_output_immediately, 0.0, 0, page_output_immediately, |
|
2102
|
488 "if paging output, start sending it as soon as it is available"); |
|
2100
|
489 |
|
2097
|
490 DEFVAR (page_screen_output, 1.0, 0, page_screen_output, |
|
|
491 "if possible, send output intended for the screen through the pager"); |
|
|
492 } |
|
|
493 |
|
1
|
494 /* |
|
|
495 ;;; Local Variables: *** |
|
|
496 ;;; mode: C++ *** |
|
|
497 ;;; End: *** |
|
|
498 */ |
