112 lines
2.8 KiB
JavaScript
112 lines
2.8 KiB
JavaScript
var fs = require('fs');
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var path = require('path');
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var less = require('less');
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var through2 = require('through2');
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var replaceExt = require('replace-ext');
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var assign = require('object-assign');
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var applySourceMap = require('vinyl-sourcemaps-apply');
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var PluginError = require('plugin-error');
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function inlineSources(map) {
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if (map.sourcesContent) {
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return Promise.resolve(map);
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}
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return Promise.all(
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map.sources.map(function (source) {
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return new Promise(function (resolve, reject) {
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fs.readFile(source, 'utf8', function (err, data) {
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if (err) {
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reject(err);
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} else {
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resolve(data);
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}
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});
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});
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})
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).then(
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function (contents) {
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map.sourcesContent = contents;
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return map;
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},
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function () {
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return map;
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}
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);
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}
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function renderLess(str, opts) {
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return new Promise(function (resolve, reject) {
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less.render(str, opts, function (err, res) {
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if (err) {
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reject(err);
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} else {
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var obj = {
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result: res.css,
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imports: res.imports,
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};
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if (opts.sourceMap && res.map) {
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obj.sourcemap = JSON.parse(res.map);
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inlineSources(obj.sourcemap).then(function (map) {
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obj.sourcemap = map;
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resolve(obj);
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});
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} else {
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resolve(obj);
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}
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}
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});
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});
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}
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module.exports = function (options) {
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// Mixes in default options.
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var opts = assign({}, {
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compress: false,
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paths: []
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}, options);
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return through2.obj(function (file, enc, cb) {
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if (file.isNull()) {
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return cb(null, file);
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}
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if (file.isStream()) {
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return cb(new PluginError('gulp-less', 'Streaming not supported'));
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}
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var str = file.contents.toString();
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// Injects the path of the current file
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opts.filename = file.path;
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// Bootstrap source maps
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if (file.sourceMap || opts.sourcemap) {
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opts.sourceMap = true;
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}
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renderLess(str, opts).then(function(res) {
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file.contents = Buffer.from(res.result);
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file.path = replaceExt(file.path, '.css');
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if (res.sourcemap) {
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res.sourcemap.file = file.relative;
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res.sourcemap.sources = res.sourcemap.sources.map(function (source) {
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return path.relative(file.base, source);
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});
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applySourceMap(file, res.sourcemap);
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}
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return file;
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}).then(function(file) {
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cb(null, file);
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}).catch(function(err) {
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// Convert the keys so PluginError can read them
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err.lineNumber = err.line;
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err.fileName = err.filename;
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// Add a better error message
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err.message = err.message + ' in file ' + err.fileName + ' line no. ' + err.lineNumber;
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return cb(new PluginError('gulp-less', err));
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});
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});
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};
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