110 lines
2.7 KiB
JavaScript
110 lines
2.7 KiB
JavaScript
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/*!
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* detect-file <https://github.com/doowb/detect-file>
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*
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* Copyright (c) 2016-2017, Brian Woodward.
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* Released under the MIT License.
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*/
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'use strict';
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var fs = require('fs');
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var path = require('path');
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/**
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* Detect the given `filepath` if it exists.
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*
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* ```js
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* var res = detect('package.json');
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* console.log(res);
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* //=> "package.json"
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*
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* var res = detect('fake-file.json');
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* console.log(res)
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* //=> null
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* ```
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*
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* @param {String} `filepath` filepath to detect.
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* @param {Object} `options` Additional options.
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* @param {Boolean} `options.nocase` Set this to `true` to force case-insensitive filename checks. This is useful on case sensitive file systems.
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* @return {String} Returns the detected filepath if it exists, otherwise returns `null`.
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* @api public
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*/
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module.exports = function detect(filepath, options) {
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if (!filepath || (typeof filepath !== 'string')) {
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return null;
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}
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if (fs.existsSync(filepath)) {
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return path.resolve(filepath);
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}
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options = options || {};
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if (options.nocase === true) {
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return nocase(filepath);
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}
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return null;
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};
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/**
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* Check if the filepath exists by falling back to reading in the entire directory.
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* Returns the real filepath (for case sensitive file systems) if found.
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*
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* @param {String} `filepath` filepath to check.
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* @return {String} Returns found filepath if exists, otherwise null.
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*/
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function nocase(filepath) {
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filepath = path.resolve(filepath);
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var res = tryReaddir(filepath);
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if (res === null) {
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return null;
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}
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// "filepath" is a directory, an error would be
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// thrown if it doesn't exist. if we're here, it exists
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if (res.path === filepath) {
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return res.path;
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}
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// "filepath" is not a directory
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// compare against upper case later
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// see https://nodejs.org/en/docs/guides/working-with-different-filesystems/
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var upper = filepath.toUpperCase();
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var len = res.files.length;
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var idx = -1;
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while (++idx < len) {
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var fp = path.resolve(res.path, res.files[idx]);
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if (filepath === fp || upper === fp) {
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return fp;
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}
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var fpUpper = fp.toUpperCase();
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if (filepath === fpUpper || upper === fpUpper) {
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return fp;
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}
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}
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return null;
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}
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/**
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* Try to read the filepath as a directory first, then fallback to the filepath's dirname.
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*
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* @param {String} `filepath` path of the directory to read.
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* @return {Object} Object containing `path` and `files` if succesful. Otherwise, null.
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*/
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function tryReaddir(filepath) {
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var ctx = { path: filepath, files: [] };
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try {
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ctx.files = fs.readdirSync(filepath);
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return ctx;
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} catch (err) {}
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try {
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ctx.path = path.dirname(filepath);
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ctx.files = fs.readdirSync(ctx.path);
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return ctx;
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} catch (err) {}
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return null;
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}
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