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annotate mde/setup/paths.d @ 78:79a1809421aa

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Widget data saving reimplemented for the new data system. (Now grid layout widgets remember their row & column sizes.)
author Diggory Hardy <diggory.hardy@gmail.com>
date Tue, 29 Jul 2008 18:14:53 +0100
parents 25cb7420dc91
children d8fccaa45d5f
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5f90774ea1ef Applied the GNU GPL v2 to mde.
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1 /* LICENSE BLOCK
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2 Part of mde: a Modular D game-oriented Engine
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3 Copyright © 2007-2008 Diggory Hardy
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4
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5 This program is free software: you can redistribute it and/or modify it under the terms
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6 of the GNU General Public License as published by the Free Software Foundation, either
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7 version 2 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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11 See the GNU General Public License for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16 /** Resource paths module.
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17 *
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18 * Internally to mde code other than code dealing directly with files and this module, paths are
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19 * relative to the mde directory. This module transforms those paths to absolute paths.
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20 *
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21 * Additionally, the intention is to look for all files in two directories: the installation (i.e.
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22 * main data) directory and a user directory (for user-specific configuration). Besides exposing
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23 * both paths and checking in which valid files exist, this module provides some extra mergetag
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24 * functionality to simplify correct reading and writing.
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25 *
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26 * Currently the paths are found as follows: (see codeDoc/paths.txt)
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27 */
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28 /* Implementation note:
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29 * All paths are stored internally as strings, rather than as an instance of FilePath/FilePath once
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30 * the FilePath has served its immediate purpose, since it's more convenient and creating new
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31 * FilePaths for adjusted paths should be no slower than mutating existing ones. */
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32 module mde.setup.paths;
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33
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34 import mde.exception;
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35 import mde.mergetag.Reader;
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36 import mde.mergetag.Writer;
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37 import mde.mergetag.DataSet;
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38 import mde.mergetag.exception;
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39
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40 import tango.io.Console;
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41 import tango.io.FilePath;
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42 import tango.sys.Environment;
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43 //import tango.scrapple.sys.win32.Registry; // Trouble getting this to work
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45 /** Order to read files in.
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46 *
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47 * Values: HIGH_LOW, LOW_HIGH, HIGH_ONLY. */
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48 enum PRIORITY : byte { HIGH_LOW, LOW_HIGH, HIGH_ONLY }
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49
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50 /** This struct has one instance for each "directory".
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51 *
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52 * It is the only item within this module that you should need to interact with.
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53 *
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54 * In the case of confDir, the user path is guaranteed to exist (as highest priority path). */
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55 struct mdeDirectory
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56 {
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57 /** Creates an MT reader for each file.
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58 *
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59 * Params:
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60 * file = The file path and name relative to the mdeDirectory, without a suffix
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61 * (e.g. "options")
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62 * readOrder = Read the highest priority or lowest priority files first? For correct merging,
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63 * this should be LOW_HIGH when newly-read items override old ones (as is the case
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64 * with DefaultData) and HIGH_LOW when the first-read items survive. Thus override
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65 * order needs to be the same for each section, except the header which is always
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66 * read with LOW_HIGH order.
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67 * Alternately, for files which shouldn't be
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68 * merged where only the highest priority file should be read, pass HIGH_ONLY.
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69 * ds = The dataset, as for mergetag. Note: all actual readers share one dataset.
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70 * rdHeader = Read the headers for each file and merge if rdHeader == true.
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71 */
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72 IReader makeMTReader (char[] file, PRIORITY readOrder, DataSet ds = null, bool rdHeader = false)
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73 {
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74 FilePath[] files = getFiles (file, readOrder);
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75 if (files is null)
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76 throw new NoFileException ("Unable to find the file: "~file~"[.mtt|mtb]");
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77
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78 return new mdeReader (files, ds, rdHeader);
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79 }
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80
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81 /** Creates an MT writer for file deciding on the best path to use.
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82 *
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83 * Params:
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84 * file = The file path and name relative to the mdeDirectory, without a suffix
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85 * (e.g. "options")
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86 * ds = The dataset, as for mergetag.
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87 */
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88 IWriter makeMTWriter (char[] file, DataSet ds = null)
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89 {
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90 // FIXME: use highest priority writable path
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91 return makeWriter (paths[pathsLen-1] ~ file, ds, WriterMethod.Text);
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92 }
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93
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94 /** Returns a string listing the file name or names (if readOrder is not HIGH_ONLY and multiple
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95 * matches are found), or "no file found". Intended for user output only. */
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96 char[] getFileName (char[] file, PRIORITY readOrder)
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97 {
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98 FilePath[] files = getFiles (file, readOrder);
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99 if (files is null)
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100 return "no file found";
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101
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102 char[] ret = files[0].toString;
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103 foreach (f; files[1..$])
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104 ret ~= ", " ~ f.toString;
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105 return ret;
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106 }
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107
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108 /** Check whether the given file exists under any path with either .mtt or .mtb suffix. */
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109 bool exists (char[] file) {
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110 for (uint i = 0; i < pathsLen; ++i) {
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111 if (FilePath (paths[i]~file~".mtt").exists) return true;
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112 if (FilePath (paths[i]~file~".mtb").exists) return true;
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113 }
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114 return false;
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115 }
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116
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117 /// Print all paths found.
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118 static void printPaths () {
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119 Cout ("Data paths found:");
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120 dataDir.coutPaths;
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121 Cout ("\nConf paths found:");
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122 confDir.coutPaths;
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123 Cout ("\nLog file directory:\n\t")(logDir).newline;
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124 }
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diff changeset
125
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126 private:
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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127 FilePath[] getFiles (char[] filename, PRIORITY readOrder)
75
25cb7420dc91 A massive overhaul/rewrite for the gui's data management and setup code. Currently much that was working is broken.
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diff changeset
128 {
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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diff changeset
129 FilePath[] ret;
68
3a737e06dc50 Unittests: fixes and changes. Plus some doc changes.
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diff changeset
130
3a737e06dc50 Unittests: fixes and changes. Plus some doc changes.
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diff changeset
131 debug (mdeUnitTest) {
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diff changeset
132 /* Alternate approach - just try from current directory.
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133 * Really just for unittests, but with the if condition it shouldn't break anything else. */
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134 if (pathsLen == 0) {
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135 FilePath file = findFile (filename);
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diff changeset
136 if (file !is null)
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137 ret ~= file;
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138 return ret;
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139 }
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140 }
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diff changeset
141
47
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diff changeset
142 if (readOrder == PRIORITY.LOW_HIGH) {
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diff changeset
143 for (size_t i = 0; i < pathsLen; ++i) {
67
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144 FilePath file = findFile (paths[i]~filename);
47
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145 if (file !is null)
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146 ret ~= file;
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147 }
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148 } else {
75
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diff changeset
149 assert (readOrder == PRIORITY.HIGH_LOW ||
25cb7420dc91 A massive overhaul/rewrite for the gui's data management and setup code. Currently much that was working is broken.
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diff changeset
150 readOrder == PRIORITY.HIGH_ONLY );
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diff changeset
151
47
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diff changeset
152 for (int i = pathsLen - 1; i >= 0; --i) {
67
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153 FilePath file = findFile (paths[i]~filename);
78
79a1809421aa Widget data saving reimplemented for the new data system. (Now grid layout widgets remember their row & column sizes.)
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diff changeset
154 if (file !is null)
47
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diff changeset
155 ret ~= file;
78
79a1809421aa Widget data saving reimplemented for the new data system. (Now grid layout widgets remember their row & column sizes.)
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diff changeset
156 if (readOrder == PRIORITY.HIGH_ONLY) break;
47
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157 }
e0839643ff52 New mtcp utility and changes to paths.
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diff changeset
158 }
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diff changeset
159 return ret;
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160 }
15
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161
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162 // Unconditionally add a path
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163 void addPath (char[] path) {
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164 paths[pathsLen++] = path~'/';
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165 }
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166
18
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167 // Test a path and add if is a folder.
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parents: 17
diff changeset
168 bool tryPath (char[] path, bool create = false) {
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169 FilePath fp = FilePath (path);
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170 if (fp.exists && fp.isFolder) {
15
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171 paths[pathsLen++] = path~'/';
18
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172 return true;
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parents: 17
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173 } else if (create) {
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diff changeset
174 try {
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diff changeset
175 fp.create;
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diff changeset
176 paths[pathsLen++] = fp.toString~'/';
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diff changeset
177 return true;
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parents: 17
diff changeset
178 } catch (Exception e) {
28
b5fadd8d930b Small addition to GUI, paths work-around for Windows.
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179 // No logging avaiable yet: Use Stdout/Cout
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180 Cout ("Creating path "~path~" failed:" ~ e.msg).newline;
18
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diff changeset
181 }
15
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182 }
18
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183 return false;
15
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184 }
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185
53
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diff changeset
186 void coutPaths () {
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diff changeset
187 if (pathsLen) {
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188 for (size_t i = 0; i < pathsLen; ++i)
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189 Cout ("\n\t" ~ paths[i]);
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190 } else
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diff changeset
191 Cout ("[none]");
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192 }
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diff changeset
193
15
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194 // Use a static array to store all possible paths with separate length counters.
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195 // Lowest priority paths are first.
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196 char[][MAX_PATHS] paths;
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197 ubyte pathsLen = 0;
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198 }
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parents:
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199
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parents:
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200 /** These are the actual instances, one for each of the data and conf "directories". */
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parents:
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201 mdeDirectory dataDir, confDir;
18
56a42ec95024 Changes to Init and logging.
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parents: 17
diff changeset
202 char[] logDir;
15
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parents:
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203
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parents:
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204 //BEGIN Path resolution
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Diggory Hardy <diggory.hardy@gmail.com>
parents:
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205 // These are used several times:
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parents:
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206 const DATA = "/data";
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parents:
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207 const CONF = "/conf";
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parents:
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208
28
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diff changeset
209 /** Find at least one path for each required directory.
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diff changeset
210 *
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211 * Note: the logger cannot be used yet, so only output is exception messages. */
44
07bd1a09e161 Started implementing text rendering.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 28
diff changeset
212 // FIXME: use tango/sys/Environment.d
15
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parents:
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213 version (linux) {
53
f000d6cd0f74 Changes to paths, command line arguments and font LCD rendering.
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diff changeset
214 // base-path not used on posix
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diff changeset
215 void resolvePaths (char[] = null) {
15
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216 // Home directory:
53
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diff changeset
217 char[] HOME = Environment.get("HOME", ".");
15
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parents:
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218
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parents:
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219 // Base paths:
18
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diff changeset
220 // Static data (must exist):
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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parents: 63
diff changeset
221 FilePath staticPath =
53
f000d6cd0f74 Changes to paths, command line arguments and font LCD rendering.
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parents: 47
diff changeset
222 findPath (false, "/usr/share/games/mde", "/usr/local/share/games/mde", "data");
18
56a42ec95024 Changes to Init and logging.
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parents: 17
diff changeset
223 // Config (can just use defaults if necessary, so long as we can save afterwards):
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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parents: 63
diff changeset
224 FilePath userPath = findPath (true, HOME~"/.config/mde", HOME~"/.mde");
15
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225
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parents:
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226 // Static data paths:
18
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parents: 17
diff changeset
227 dataDir.addPath (staticPath.toString); // we know this is valid anyway
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diff changeset
228 dataDir.tryPath (userPath.toString ~ DATA);
53
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diff changeset
229 if (extraDataPath) dataDir.tryPath (extraDataPath);
18
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parents: 17
diff changeset
230 if (!dataDir.pathsLen) throw new mdeException ("Fatal: no data path found!");
15
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231
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232 // Configuration paths:
18
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diff changeset
233 confDir.tryPath (staticPath.toString ~ CONF);
24
32eff0e01c05 Only locally-changed options are stored in user-config now. Log levels revised.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 18
diff changeset
234 confDir.tryPath ("/etc/mde");
32eff0e01c05 Only locally-changed options are stored in user-config now. Log levels revised.
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parents: 18
diff changeset
235 confDir.tryPath (userPath.toString ~ CONF, true);
53
f000d6cd0f74 Changes to paths, command line arguments and font LCD rendering.
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parents: 47
diff changeset
236 if (extraConfPath) confDir.tryPath (extraConfPath);
18
56a42ec95024 Changes to Init and logging.
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parents: 17
diff changeset
237 if (!confDir.pathsLen) throw new mdeException ("Fatal: no conf path found!");
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parents: 17
diff changeset
238
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parents: 17
diff changeset
239 // Logging path:
56a42ec95024 Changes to Init and logging.
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parents: 17
diff changeset
240 logDir = userPath.toString;
15
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parents:
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241 }
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parents:
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242 } else version (Windows) {
53
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parents: 47
diff changeset
243 void resolvePaths (char[] base = "./") {
28
b5fadd8d930b Small addition to GUI, paths work-around for Windows.
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parents: 27
diff changeset
244 //FIXME: Get path from registry
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parents: 27
diff changeset
245 //FIXME: Get user path (Docs&Settings/USER/Local Settings/Application data/mde)
53
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parents: 47
diff changeset
246 //http://www.dsource.org/projects/tango/forums/topic/187
15
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247
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parents:
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248 // Base paths:
67
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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parents: 63
diff changeset
249 FilePath installPath = findPath (false, base);
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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parents: 63
diff changeset
250 FilePath staticPath = findPath (false, installPath.append("data").toString);
108d123238c0 Changes to work with tango r3700 (post 0.99.6).
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parents: 63
diff changeset
251 FilePath userPath = findPath (true, installPath.append("user").toString); // FIXME: see above
15
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252
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parents:
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253 // Static data paths:
18
56a42ec95024 Changes to Init and logging.
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diff changeset
254 dataDir.addPath (staticPath.toString); // we know this is valid anyway
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255 dataDir.tryPath (userPath.toString ~ DATA);
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256 if (extraDataPath) dataDir.tryPath (extraDataPath);
18
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257 if (!dataDir.pathsLen) throw new mdeException ("Fatal: no data path found!");
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258
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259 // Configuration paths:
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260 confDir.tryPath (staticPath.toString ~ CONF);
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261 confDir.tryPath (installPath.append("user").toString);
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262 confDir.tryPath (userPath.toString ~ CONF, true);
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263 if (extraConfPath) confDir.tryPath (extraConfPath);
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264 if (!confDir.pathsLen) throw new mdeException ("Fatal: no conf path found!");
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265
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266 // Logging path:
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267 logDir = userPath.toString;
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268 }
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269 } else {
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270 static assert (false, "Platform is not linux or Windows: no support for paths on this platform yet!");
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271 }
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272
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273 /// For command line args: these paths are added if non-null, with highest priority.
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274 char[] extraDataPath, extraConfPath;
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275
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276 private {
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277 class PathException : mdeException {
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278 this(char[] msg) {
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279 super (msg);
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280 }
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281 }
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282
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283 // The maximum number of paths for any one "directory".
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284 // There are NO CHECKS that this is not exceeded.
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285 const MAX_PATHS = 4;
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286
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287 /* Try each path in succession, returning the first to exist and be a folder.
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288 * If none are valid and create is true, will try creating each in turn.
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289 * If still none are valid, throws. */
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290 FilePath findPath (bool create, char[][] paths ...) {
53
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291 FilePath[] fps;
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292 fps.length = paths.length;
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293 foreach (i,path; paths) {
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294 FilePath pv = new FilePath (path);
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295 if (pv.exists && pv.isFolder) return pv; // got a valid path
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296 fps[i] = pv;
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297 }
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298 if (create) { // try to create a folder, using each path in turn until succesful
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299 foreach (fp; fps) {
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300 try {
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301 return fp.create;
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302 }
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303 catch (Exception e) {}
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304 }
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305 }
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306 // no valid path...
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307 char[] msg = "Unable to find"~(create ? " or create" : "")~" a required path! The following were tried:";
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308 foreach (path; paths) msg ~= " \"" ~ path ~ '\"';
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309 throw new PathException (msg);
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310 }
53
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311 //END Path resolution
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312
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313 /** A special adapter for reading from multiple mergetag files with the same relative path to an
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314 * mdeDirectory simultaneously.
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315 */
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316 class mdeReader : IReader
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317 {
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318 private this (FilePath[] files, DataSet ds, bool rdHeader)
53
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319 in {
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320 assert (files !is null, "mdeReader.this: files is null");
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321 } body {
63
66d555da083e Moved many modules/packages to better reflect usage.
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322 // Don't let sub-readers create their own, separate, datasets:
53
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323 if (ds is null) ds = new DataSet;
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324
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325 foreach (file; files) {
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326 IReader r = makeReader (file, ds, rdHeader);
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327
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328 readers[readersLen++] = r;
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329 }
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330 }
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331
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332 DataSet dataset () { /// Get the DataSet
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333 return readers[0].dataset; // all readers share the same dataset
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334 }
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335 void dataset (DataSet ds) { /// Set the DataSet
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336 for (uint i = 0; i < readersLen; ++i) readers[i].dataset (ds);
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337 }
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338
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339 void dataSecCreator (IDataSection delegate (ID) dsC) { /// Set the dataSecCreator
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340 for (uint i = 0; i < readersLen; ++i) readers[i].dataSecCreator = dsC;
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341 }
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342
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343 /** Get identifiers for all sections.
53
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344 *
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345 * Note: the identifiers from all sections in all files are just strung together, starting with
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346 * the highest-priority file. */
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347 ID[] getSectionNames () {
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348 ID[] names;
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349 for (int i = readersLen-1; i >= 0; --i) names ~= readers[i].getSectionNames;
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350 return names;
53
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351 }
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352 void read () { /// Commence reading
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353 for (uint i = 0; i < readersLen; ++i) readers[i].read();
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354 }
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355 void read (ID[] secSet) { /// ditto
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356 for (uint i = 0; i < readersLen; ++i) readers[i].read(secSet);
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357 }
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358 void read (View!(ID) secSet) { /// ditto
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359 for (uint i = 0; i < readersLen; ++i) readers[i].read(secSet);
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360 }
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361
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362 private:
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363 IReader[MAX_PATHS] readers;
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364 ubyte readersLen = 0;
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365
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366 PRIORITY rdOrder;
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367 }
75
25cb7420dc91 A massive overhaul/rewrite for the gui's data management and setup code. Currently much that was working is broken.
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368 }
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369
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370 /// Thrown when makeMTReader couldn't find a file.
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371 class NoFileException : MTFileIOException {
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372 this (char[] msg) {
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373 super(msg);
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374 }
53
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375 }