1 | /**
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2 | * @fileoverview Util class to find config files.
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3 | * @author Aliaksei Shytkin
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4 | */
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5 |
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6 | ;
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7 |
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8 | //------------------------------------------------------------------------------
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9 | // Requirements
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10 | //------------------------------------------------------------------------------
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11 |
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12 | const fs = require("fs"),
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13 | path = require("path");
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14 |
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15 | //------------------------------------------------------------------------------
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16 | // Helpers
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17 | //------------------------------------------------------------------------------
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18 |
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19 | /**
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20 | * Get the entries for a directory. Including a try-catch may be detrimental to
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21 | * function performance, so move it out here a separate function.
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22 | * @param {string} directory The directory to search in.
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23 | * @returns {string[]} The entries in the directory or an empty array on error.
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24 | * @private
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25 | */
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26 | function getDirectoryEntries(directory) {
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27 | try {
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28 | return fs.readdirSync(directory);
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29 | } catch (ex) {
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30 | return [];
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31 | }
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32 | }
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33 |
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34 | /**
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35 | * Create a hash of filenames from a directory listing
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36 | * @param {string[]} entries Array of directory entries.
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37 | * @param {string} directory Path to a current directory.
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38 | * @param {string[]} supportedConfigs List of support filenames.
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39 | * @returns {Object} Hashmap of filenames
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40 | */
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41 | function normalizeDirectoryEntries(entries, directory, supportedConfigs) {
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42 | const fileHash = {};
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43 |
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44 | entries.forEach(entry => {
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45 | if (supportedConfigs.indexOf(entry) >= 0) {
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46 | const resolvedEntry = path.resolve(directory, entry);
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47 |
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48 | if (fs.statSync(resolvedEntry).isFile()) {
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49 | fileHash[entry] = resolvedEntry;
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50 | }
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51 | }
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52 | });
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53 | return fileHash;
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54 | }
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55 |
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56 | //------------------------------------------------------------------------------
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57 | // API
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58 | //------------------------------------------------------------------------------
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59 |
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60 | /**
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61 | * FileFinder class
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62 | */
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63 | class FileFinder {
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64 |
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65 | /**
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66 | * @param {string[]} files The basename(s) of the file(s) to find.
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67 | * @param {stirng} cwd Current working directory
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68 | */
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69 | constructor(files, cwd) {
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70 | this.fileNames = Array.isArray(files) ? files : [files];
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71 | this.cwd = cwd || process.cwd();
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72 | this.cache = {};
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73 | }
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74 |
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75 | /**
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76 | * Find all instances of files with the specified file names, in directory and
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77 | * parent directories. Cache the results.
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78 | * Does not check if a matching directory entry is a file.
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79 | * Searches for all the file names in this.fileNames.
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80 | * Is currently used by lib/config.js to find .eslintrc and package.json files.
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81 | * @param {string} directory The directory to start the search from.
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82 | * @returns {string[]} The file paths found.
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83 | */
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84 | findAllInDirectoryAndParents(directory) {
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85 | const cache = this.cache;
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86 |
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87 | if (directory) {
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88 | directory = path.resolve(this.cwd, directory);
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89 | } else {
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90 | directory = this.cwd;
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91 | }
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92 |
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93 | if (cache.hasOwnProperty(directory)) {
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94 | return cache[directory];
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95 | }
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96 |
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97 | const dirs = [];
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98 | const fileNames = this.fileNames;
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99 | let searched = 0;
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100 |
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101 | do {
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102 | dirs[searched++] = directory;
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103 | cache[directory] = [];
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104 |
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105 | const filesMap = normalizeDirectoryEntries(getDirectoryEntries(directory), directory, fileNames);
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106 |
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107 | if (Object.keys(filesMap).length) {
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108 | for (let k = 0; k < fileNames.length; k++) {
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109 |
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110 | if (filesMap[fileNames[k]]) {
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111 | const filePath = filesMap[fileNames[k]];
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112 |
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113 | // Add the file path to the cache of each directory searched.
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114 | for (let j = 0; j < searched; j++) {
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115 | cache[dirs[j]].push(filePath);
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116 | }
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117 |
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118 | break;
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119 | }
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120 | }
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121 | }
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122 | const child = directory;
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123 |
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124 | // Assign parent directory to directory.
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125 | directory = path.dirname(directory);
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126 |
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127 | if (directory === child) {
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128 | return cache[dirs[0]];
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129 | }
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130 | } while (!cache.hasOwnProperty(directory));
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131 |
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132 | // Add what has been cached previously to the cache of each directory searched.
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133 | for (let i = 0; i < searched; i++) {
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134 | dirs.push.apply(cache[dirs[i]], cache[directory]);
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135 | }
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136 |
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137 | return cache[dirs[0]];
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138 | }
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139 | }
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140 |
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141 | module.exports = FileFinder;
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