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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 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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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 <string> |
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28 |
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29 #include "file-stat.h" |
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30 #include "str-vec.h" |
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31 |
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32 #include <defaults.h> |
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33 #include "dir-ops.h" |
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34 #include "dirfns.h" |
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35 #include "error.h" |
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36 #include "fn-cache.h" |
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37 #include "pathsearch.h" |
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38 |
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39 octave_fcn_file_name_cache *octave_fcn_file_name_cache::instance = 0; |
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40 |
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41 // Update the cache. Returns TRUE if something needed to be updated. |
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42 |
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43 // We just accumulate all directories ever referenced in the cache and |
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44 // we don't delete any old ones. |
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45 |
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46 bool |
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47 octave_fcn_file_name_cache::update (const std::string& path) |
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48 { |
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49 bool something_changed = false; |
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50 |
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51 dir_path p = path.empty () ? Vload_path_dir_path : dir_path (path); |
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52 |
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53 string_vector dirs = p.all_directories (); |
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54 |
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55 int len = dirs.length (); |
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56 |
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57 for (int i = 0; i < len; i++) |
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58 { |
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59 std::string d = dirs[i]; |
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60 |
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61 if (cache.find (d) != cache.end ()) |
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62 { |
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63 if (cache[d].update (d)) |
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64 something_changed = true; |
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65 } |
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66 else |
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67 { |
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68 cache[d] = file_name_cache_elt (d); |
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69 something_changed = true; |
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70 } |
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71 } |
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72 |
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73 return something_changed; |
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74 } |
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75 |
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76 string_vector |
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77 octave_fcn_file_name_cache::list (const std::string& path, bool no_suffix) |
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78 { |
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79 string_vector retval; |
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80 |
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81 if (! instance) |
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82 instance = new octave_fcn_file_name_cache (); |
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83 |
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84 if (instance) |
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85 retval = instance->do_list (path, no_suffix); |
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86 else |
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87 error ("unable to create file name cache object!"); |
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88 |
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89 return retval; |
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90 } |
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91 |
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92 // Check to see if any of the elements in the cache need to be |
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93 // updated, then return the list of names in the cache. |
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94 |
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95 string_vector |
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96 octave_fcn_file_name_cache::do_list (const std::string& path, bool no_suffix) |
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97 { |
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98 update (path); |
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99 |
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100 string_vector fcn_file_names; |
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101 string_vector fcn_file_names_no_suffix; |
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102 |
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103 // For now, always generate the list of function files on each |
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104 // call. |
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105 |
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106 // XXX FIXME XXX -- this could probably be improved by keeping lists |
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107 // of all the function files for the current load path and only |
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108 // updating that when the load path changes. Have to be careful to |
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109 // return the right thing when we are only looking for a subset of |
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110 // all the files in the load path. |
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111 |
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112 int total_len = 0; |
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113 |
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114 dir_path p = path.empty () ? Vload_path_dir_path : dir_path (path); |
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115 |
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116 string_vector dirs = p.all_directories (); |
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117 |
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118 int ndirs = dirs.length (); |
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119 |
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120 if (ndirs > 1) |
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121 { |
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122 for (int i = 0; i < ndirs; i++) |
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123 { |
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124 std::string d = dirs[i]; |
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125 |
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126 total_len += cache[d].length (); |
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127 } |
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128 |
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129 fcn_file_names.resize (total_len); |
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130 fcn_file_names_no_suffix.resize (total_len); |
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131 |
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132 int k = 0; |
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133 |
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134 for (int j = 0; j < ndirs; j++) |
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135 { |
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136 std::string d = dirs[j]; |
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137 |
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138 file_name_cache_elt elt = cache[d]; |
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139 |
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140 int len = elt.length (); |
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141 |
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142 string_vector ffn = elt.fcn_file_names; |
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143 string_vector ffnns = elt.fcn_file_names_no_suffix; |
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144 |
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145 for (int i = 0; i < len; i++) |
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146 { |
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147 fcn_file_names[k] = ffn[i]; |
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148 fcn_file_names_no_suffix[k] = ffnns[i]; |
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149 |
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150 k++; |
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151 } |
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152 } |
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153 } |
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154 else if (ndirs == 1) |
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155 { |
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156 std::string d = dirs[0]; |
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157 |
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158 file_name_cache_elt elt = cache[d]; |
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159 |
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160 fcn_file_names = elt.fcn_file_names; |
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161 fcn_file_names_no_suffix = elt.fcn_file_names_no_suffix; |
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162 } |
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163 |
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164 return no_suffix ? fcn_file_names_no_suffix : fcn_file_names; |
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165 } |
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166 |
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167 // Create a list of the function names in a given directory. Returns |
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168 // TRUE if the cache element was out of date. |
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169 |
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170 bool |
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171 file_name_cache_elt::update (const std::string& dir_name) |
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172 { |
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173 bool retval = false; |
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174 |
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175 file_stat file (dir_name); |
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176 |
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177 // If the directory doesn't exist, delete the names in the cache. |
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178 // If it does exist,read it only if it is out of date. |
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179 |
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180 if (file) |
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181 { |
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182 if (file.is_newer (timestamp)) |
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183 { |
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184 retval = true; |
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185 |
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186 timestamp = file.mtime (); |
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187 |
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188 dir_entry dir (dir_name); |
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189 |
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190 if (dir) |
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191 { |
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192 string_vector tmp = dir.read (); |
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193 |
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194 int max_len = tmp.length (); |
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195 |
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196 fcn_file_names.resize (max_len); |
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197 fcn_file_names_no_suffix.resize (max_len); |
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198 |
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199 int k = 0; |
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200 int i; |
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201 for (i = 0; i < max_len; i++) |
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202 { |
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203 std::string entry = tmp[i]; |
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204 |
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205 int len = entry.length (); |
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206 |
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207 #if defined (ENABLE_DYNAMIC_LINKING) |
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208 if ((len > 2 |
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209 && entry[len-2] == '.' && entry[len-1] == 'm') |
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210 || (len > 4 |
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211 && entry[len-4] == '.' && entry[len-3] == 'o' |
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212 && entry[len-2] == 'c' && entry[len-1] == 't')) |
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213 #else |
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214 if (len > 2 |
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215 && entry[len-2] == '.' && entry[len-1] == 'm') |
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216 #endif |
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217 { |
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218 fcn_file_names[k] = entry; |
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219 |
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220 fcn_file_names_no_suffix[k] = (entry[len-1] == 'm') |
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221 ? std::string (entry, 0, len-2) |
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222 : std::string (entry, 0, len-4); |
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223 |
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224 k++; |
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225 } |
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226 } |
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227 |
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228 fcn_file_names.resize (k); |
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229 fcn_file_names_no_suffix.resize (k); |
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230 } |
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231 else |
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232 { |
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233 fcn_file_names.resize (0); |
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234 fcn_file_names_no_suffix.resize (0); |
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235 } |
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236 } |
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237 } |
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238 else |
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239 { |
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240 fcn_file_names.resize (0); |
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241 fcn_file_names_no_suffix.resize (0); |
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242 } |
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243 |
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244 return retval; |
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245 } |
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246 |
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247 /* |
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248 ;;; Local Variables: *** |
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249 ;;; mode: C++ *** |
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250 ;;; End: *** |
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251 */ |
