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64 lines
1.7 KiB
TypeScript
64 lines
1.7 KiB
TypeScript
/*
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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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import * as _ from 'lodash';
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import { lookup } from 'mime-types';
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/**
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* @summary Get the extensions of a file
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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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export function getFileExtensions(filePath: string): string[] {
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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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*
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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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export function getLastFileExtension(filePath: string): string | null {
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return _.last(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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*
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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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export function getPenultimateFileExtension(filePath: string): string | null {
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const extensions = getFileExtensions(filePath);
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if (extensions.length >= 2) {
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const ext = extensions[extensions.length - 2];
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return lookup(ext) ? ext : null;
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}
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return null;
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}
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