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1 // octave-hist.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 The functions listed below were adapted from similar functions from |
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23 GNU Bash, the Bourne Again SHell, copyright (C) 1987, 1989, 1991 Free |
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24 Software Foundation, Inc. |
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25 |
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26 do_history edit_history_readline |
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27 do_edit_history edit_history_add_hist |
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28 |
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29 */ |
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30 |
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31 #ifdef __GNUG__ |
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32 #pragma implementation |
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33 #endif |
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34 |
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35 #include <sys/types.h> |
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36 #ifdef HAVE_UNISTD_H |
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37 #include <unistd.h> |
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38 #endif |
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39 #include <fcntl.h> |
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40 #include <stdlib.h> |
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41 #include <stdio.h> |
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42 #include <string.h> |
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43 #include <signal.h> |
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44 #include <fstream.h> |
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45 #include <strstream.h> |
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46 |
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47 #include "statdefs.h" |
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48 #include "utils.h" |
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49 #include "error.h" |
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50 #include "input.h" |
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51 #include "octave.h" |
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52 #include "unwind-prot.h" |
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53 #include "octave-hist.h" |
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54 #include "sighandlers.h" |
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55 |
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56 extern "C" |
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57 { |
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58 #include <readline/history.h> |
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59 } |
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60 |
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61 // Nonzero means we are saving history lines. |
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62 int saving_history = 1; |
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63 |
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64 // The number of lines to save in the history file. |
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65 static int octave_hist_size = 1024; |
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66 |
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67 // The name of the history file. |
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68 static char *octave_hist_file; |
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69 |
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70 // The number of hisory lines we read from the history file. |
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71 static int history_lines_in_file = 0; |
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72 |
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73 // The number of history lines we've saved so far. |
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74 static int history_lines_this_session = 0; |
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75 |
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76 /* |
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77 * Get some default values, possibly reading them from the |
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78 * environment. |
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79 */ |
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80 static int |
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81 default_history_size (void) |
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82 { |
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83 int size = 1024; |
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84 char *env_size = getenv ("OCTAVE_HISTSIZE"); |
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85 if (env_size != (char *) NULL) |
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86 { |
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87 int val; |
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88 if (sscanf (env_size, "%d", &val) == 1) |
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89 size = val > 0 ? val : 0; |
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90 } |
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91 return size; |
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92 } |
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93 |
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94 static char * |
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95 default_history_file (void) |
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96 { |
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97 char *file = (char *) NULL;; |
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98 |
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99 char *env_file = getenv ("OCTAVE_HISTFILE"); |
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100 if (env_file != (char *) NULL) |
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101 { |
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102 fstream f (env_file, (ios::in | ios::out)); |
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103 if (f != 0) |
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104 { |
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105 file = strsave (env_file); |
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106 f.close (); |
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107 } |
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108 } |
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109 |
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110 if (file == (char *) NULL) |
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111 { |
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112 if (home_directory != NULL) |
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113 file = strconcat (home_directory, "/.octave_hist"); |
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114 } |
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115 |
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116 return file; |
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117 } |
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118 |
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119 /* |
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120 * Prime the history list. |
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121 */ |
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122 void |
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123 initialize_history (void) |
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124 { |
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125 octave_hist_file = default_history_file (); |
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126 octave_hist_size = default_history_size (); |
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127 |
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128 read_history (octave_hist_file); |
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129 using_history (); |
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130 history_lines_in_file = where_history (); |
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131 } |
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132 |
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133 void |
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134 clean_up_history (void) |
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135 { |
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136 stifle_history (octave_hist_size); |
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137 write_history (octave_hist_file); |
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138 } |
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139 |
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140 void |
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141 maybe_save_history (char *s) |
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142 { |
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143 if (saving_history) |
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144 { |
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145 add_history (s); |
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146 history_lines_this_session++; |
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147 } |
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148 } |
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149 |
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150 /* |
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151 * Display, save, or load history. Stolen and modified from bash. |
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152 * |
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153 * Arg of -w FILENAME means write file, arg of -r FILENAME |
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154 * means read file, arg of -q means don't number lines. Arg of N |
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155 * means only display that many items. |
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156 */ |
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157 void |
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158 do_history (int argc, char **argv) |
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159 { |
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160 HIST_ENTRY **hlist; |
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161 |
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162 int numbered_output = 1; |
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163 |
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164 while (--argc > 0) |
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165 { |
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166 argv++; |
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167 |
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168 if (*argv[0] == '-' && strlen (*argv) == 2 |
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169 && ((*argv)[1] == 'r' || (*argv)[1] == 'w' |
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170 || (*argv)[1] == 'a' || (*argv)[1] == 'n')) |
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171 { |
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172 char *file; |
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173 int result = 0; |
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174 |
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175 if (argc > 1) |
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176 file = *(argv+1); |
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177 else |
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178 file = octave_hist_file; |
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179 |
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180 switch ((*argv)[1]) |
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181 { |
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182 case 'a': // Append `new' lines to file. |
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183 { |
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184 if (history_lines_this_session) |
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185 { |
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186 if (history_lines_this_session < where_history ()) |
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187 { |
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188 // If the filename was supplied, then create it if it doesn't already |
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189 // exist. |
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190 if (file) |
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191 { |
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192 struct stat buf; |
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193 |
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194 if (stat (file, &buf) == -1) |
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195 { |
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196 int tem; |
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197 |
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198 tem = open (file, O_CREAT, 0666); |
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199 close (tem); |
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200 } |
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201 } |
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202 |
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203 result = |
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204 append_history (history_lines_this_session, file); |
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205 history_lines_in_file += history_lines_this_session; |
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206 history_lines_this_session = 0; |
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207 } |
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208 } |
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209 } |
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210 break; |
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211 case 'w': // Write entire history. |
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212 result = write_history (file); |
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213 break; |
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214 case 'r': // Read entire file. |
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215 result = read_history (file); |
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216 break; |
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217 case 'n': // Read `new' history from file. |
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218 // Read all of the lines in the file that we haven't already read. |
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219 using_history (); |
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220 result = read_history_range (file, history_lines_in_file, -1); |
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221 using_history (); |
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222 history_lines_in_file = where_history (); |
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223 break; |
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224 } |
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225 return; |
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226 } |
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227 else if (strcmp (*argv, "-q") == 0) |
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228 numbered_output = 0; |
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229 else if (strcmp (*argv, "--") == 0) |
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230 { |
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231 argc--; |
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232 argv++; |
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233 break; |
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234 } |
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235 else |
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236 break; |
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237 } |
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238 |
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239 int limited = 0; |
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240 int limit = 0; |
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241 |
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242 if (argc > 0) |
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243 { |
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244 limited = 1; |
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245 if (sscanf (*argv, "%d", &limit) != 1) |
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246 { |
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247 if (*argv[0] == '-') |
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248 message ("history", "unrecognized option `%s'", *argv); |
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249 else |
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250 message ("history", "bad non-numeric arg `%s'", *argv); |
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251 return; |
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252 } |
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253 } |
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254 |
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255 hlist = history_list (); |
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256 |
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257 if (hlist) |
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258 { |
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259 for (int i = 0; hlist[i] != (HIST_ENTRY *) NULL; i++) |
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260 ; // Do nothing. |
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261 |
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262 if (limit < 0) |
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263 limit = -limit; |
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264 |
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265 if (!limited) |
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266 i = 0; |
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267 else |
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268 if ((i -= limit) < 0) |
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269 i = 0; |
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270 |
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271 while (hlist[i]) |
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272 { |
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273 // QUIT; // in bash: (interrupt_state) throw_to_top_level (); |
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274 |
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275 if (numbered_output) |
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276 cerr.form ("%5d%c", i + history_base, hlist[i]->data ? '*' : ' '); |
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277 cerr << hlist[i]->line << "\n"; |
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278 i++; |
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279 } |
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280 } |
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281 } |
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282 |
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283 /* |
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284 * Read the edited history lines from STREAM and return them |
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285 * one at a time. This can read unlimited length lines. The |
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286 * caller should free the storage. |
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287 */ |
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288 static char * |
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289 edit_history_readline (fstream& stream) |
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290 { |
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291 char c; |
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292 int line_len = 128; |
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293 int lindex = 0; |
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294 char *line = new char [line_len]; |
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295 line[0] = '\0'; |
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296 |
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297 while (stream.get (c)) |
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298 { |
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299 if (lindex + 2 >= line_len) |
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300 { |
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301 char *tmp_line = new char [line_len += 128]; |
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302 strcpy (tmp_line, line); |
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303 delete [] line; |
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304 line = tmp_line; |
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305 } |
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306 |
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307 if (c == '\n') |
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308 { |
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309 line[lindex++] = '\n'; |
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310 line[lindex++] = '\0'; |
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311 return line; |
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312 } |
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313 else |
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314 line[lindex++] = c; |
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315 } |
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316 |
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317 if (! lindex) |
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318 { |
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319 delete [] line; |
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320 return (char *) NULL; |
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321 } |
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322 |
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323 if (lindex + 2 >= line_len) |
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324 { |
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325 char *tmp_line = new char [lindex+3]; |
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326 strcpy (tmp_line, line); |
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327 delete [] line; |
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328 line = tmp_line; |
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329 } |
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330 |
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331 // Finish with newline if none in file. |
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332 |
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333 line[lindex++] = '\n'; |
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334 line[lindex++] = '\0'; |
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335 return line; |
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336 } |
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337 |
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338 static void |
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339 edit_history_add_hist (char *line) |
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340 { |
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341 if (line != (char *) NULL) |
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342 { |
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343 int len = strlen (line); |
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344 if (len > 0 && line[len-1] == '\n') |
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345 line[len-1] = '\0'; |
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346 |
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347 if (line[0] != '\0') |
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348 add_history (line); |
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349 } |
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350 } |
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351 |
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352 #define histline(i) (hlist[(i)]->line) |
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353 |
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354 #define EDIT_COMMAND "${EDITOR:-vi}" |
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355 |
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356 void |
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357 do_edit_history (int argc, char **argv) |
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358 { |
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359 HIST_ENTRY **hlist; |
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360 |
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361 hlist = history_list (); |
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362 |
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363 int hist_count = 0; |
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364 |
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365 while (hlist[hist_count++] != (HIST_ENTRY *) NULL) |
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366 ; // Find the number of items in the history list. |
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367 |
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368 // The current command line is already part of the history list by the |
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369 // time we get to this point. Delete it from the list. |
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370 |
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371 hist_count -= 2; |
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372 remove_history (hist_count); |
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373 hist_count--; |
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374 |
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375 // If no numbers have been specified, the default is to edit the last |
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376 // command in the history list. |
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377 |
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378 int hist_end = hist_count; |
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379 int hist_beg = hist_count; |
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380 int reverse = 0; |
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381 |
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382 // Process options |
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383 |
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384 int usage_error = 0; |
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385 if (argc == 3) |
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386 { |
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387 argv++; |
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388 if (sscanf (*argv++, "%d", &hist_beg) != 1 |
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389 || sscanf (*argv, "%d", &hist_end) != 1) |
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390 usage_error = 1; |
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391 else |
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392 { |
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393 hist_beg--; |
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394 hist_end--; |
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395 } |
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396 } |
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397 else if (argc == 2) |
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398 { |
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399 argv++; |
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400 if (sscanf (*argv++, "%d", &hist_beg) != 1) |
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401 usage_error = 1; |
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402 else |
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403 { |
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404 hist_beg--; |
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405 hist_end = hist_beg; |
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406 } |
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407 } |
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408 |
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409 if (hist_beg < 0 || hist_end < 0 || hist_beg > hist_count |
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410 || hist_end > hist_count) |
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411 { |
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412 error ("history specification out of range"); |
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413 return; |
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414 } |
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415 |
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416 if (usage_error) |
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417 { |
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418 usage ("edit_history [first] [last]"); |
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419 return; |
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420 } |
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421 |
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422 if (hist_end < hist_beg) |
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423 { |
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424 int t = hist_end; |
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425 hist_end = hist_beg; |
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426 hist_beg = t; |
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427 reverse = 1; |
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428 } |
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429 |
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430 char *name = tmpnam ((char *) NULL); |
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431 |
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432 fstream file (name, ios::out); |
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433 if (! file) |
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434 { |
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435 error ("edit_history: couldn't open temporary file `%s'", name); |
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436 return; |
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437 } |
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438 |
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439 if (reverse) |
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440 { |
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441 for (int i = hist_end; i >= hist_beg; i--) |
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442 file << histline (i) << "\n"; |
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443 } |
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444 else |
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445 { |
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446 for (int i = hist_beg; i <= hist_end; i++) |
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447 file << histline (i) << "\n"; |
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448 } |
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449 |
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450 file.close (); |
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451 |
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452 // Call up our favorite editor on the file of commands. |
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453 |
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454 ostrstream buf; |
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455 buf << EDIT_COMMAND << " " << name << ends; |
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456 char *cmd = buf.str (); |
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457 |
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458 // Ignore interrupts while we are off editing commands. Should we |
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459 // maybe avoid using system()? There still seems to be a problem with |
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460 // properly waiting for emacsclient. |
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461 |
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462 volatile sig_handler *saved_sigint_handler = signal (SIGINT, SIG_IGN); |
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463 system (cmd); |
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464 signal (SIGINT, saved_sigint_handler); |
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465 |
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466 // Write the commands to the history file since parse_and_execute |
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467 // disables command line history while it executes. |
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468 |
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469 file.open (name, ios::in); |
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470 |
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471 char *line; |
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472 while ((line = edit_history_readline (file)) != NULL) |
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473 { |
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474 |
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475 // Skip blank lines |
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476 |
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477 if (line[0] == '\n') |
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478 { |
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479 delete [] line; |
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480 continue; |
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481 } |
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482 |
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483 edit_history_add_hist (line); |
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484 } |
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485 |
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486 file.close (); |
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487 |
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488 // Turn on command echo, so the output from this will make better sense. |
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489 |
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490 begin_unwind_frame ("do_edit_history"); |
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491 unwind_protect_int (echo_input); |
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492 echo_input = 1; |
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493 |
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494 parse_and_execute (name, 1); |
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495 |
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496 run_unwind_frame ("do_edit_history"); |
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497 |
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498 // Delete the temporary file. Should probably be done with an |
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499 // unwind_protect. |
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500 |
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501 unlink (name); |
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502 } |
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503 |
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504 int |
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505 current_history_number (void) |
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506 { |
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507 using_history (); |
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508 |
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509 if (octave_hist_size > 0) |
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510 return history_base + where_history (); |
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511 else |
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512 return -1; |
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513 |
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514 } |
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515 |
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516 /* |
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517 ;;; Local Variables: *** |
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518 ;;; mode: C++ *** |
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519 ;;; page-delimiter: "^/\\*" *** |
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520 ;;; End: *** |
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521 */ |
