46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
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var path = require('path');
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var fs = require('fs');
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var parse = path.parse || require('path-parse');
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module.exports = function nodeModulesPaths(start, opts) {
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var modules = opts && opts.moduleDirectory
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? [].concat(opts.moduleDirectory)
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: ['node_modules'];
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// ensure that `start` is an absolute path at this point,
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// resolving against the process' current working directory
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var absoluteStart = path.resolve(start);
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if (opts && opts.preserveSymlinks === false) {
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try {
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absoluteStart = fs.realpathSync(absoluteStart);
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} catch (err) {
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if (err.code !== 'ENOENT') {
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throw err;
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}
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}
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}
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var prefix = '/';
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if (/^([A-Za-z]:)/.test(absoluteStart)) {
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prefix = '';
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} else if (/^\\\\/.test(absoluteStart)) {
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prefix = '\\\\';
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}
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var paths = [absoluteStart];
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var parsed = parse(absoluteStart);
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while (parsed.dir !== paths[paths.length - 1]) {
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paths.push(parsed.dir);
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parsed = parse(parsed.dir);
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}
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var dirs = paths.reduce(function (dirs, aPath) {
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return dirs.concat(modules.map(function (moduleDir) {
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return path.join(prefix, aPath, moduleDir);
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}));
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}, []);
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return opts && opts.paths ? dirs.concat(opts.paths) : dirs;
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};
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