mirror of
https://github.com/balena-io/etcher.git
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77 lines
2.0 KiB
JavaScript
77 lines
2.0 KiB
JavaScript
/*
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* Copyright 2017 balena.io
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict'
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const mime = require('mime-types')
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const _ = require('lodash')
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/**
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* @summary Get the extensions of a file
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* @function
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* @public
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*
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* @param {String} filePath - file path
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* @returns {String[]} extensions
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*
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* @example
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* const extensions = fileExtensions.getFileExtensions('path/to/foo.img.gz');
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* console.log(extensions);
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* > [ 'img', 'gz' ]
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*/
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exports.getFileExtensions = _.memoize((filePath) => {
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return _.chain(filePath)
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.split('.')
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.tail()
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.map(_.toLower)
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.value()
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})
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/**
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* @summary Get the last file extension
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* @function
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* @public
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*
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* @param {String} filePath - file path
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* @returns {(String|Null)} last extension
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*
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* @example
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* const extension = fileExtensions.getLastFileExtension('path/to/foo.img.gz');
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* console.log(extension);
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* > 'gz'
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*/
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exports.getLastFileExtension = (filePath) => {
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return _.last(exports.getFileExtensions(filePath)) || null
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}
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/**
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* @summary Get the penultimate file extension
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* @function
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* @public
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*
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* @param {String} filePath - file path
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* @returns {(String|Null)} penultimate extension
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*
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* @example
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* const extension = fileExtensions.getPenultimateFileExtension('path/to/foo.img.gz');
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* console.log(extension);
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* > 'img'
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*/
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exports.getPenultimateFileExtension = (filePath) => {
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const ext = _.last(_.initial(exports.getFileExtensions(filePath)))
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return !_.isNil(ext) && mime.lookup(ext) ? ext : null
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}
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