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index.js
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index.js
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const path = require('path');
const {merge} = require('lodash');
const {FSWatcher} = require('chokidar');
const minimatch = require('minimatch');
const sass = require('node-sass');
/**
* Sass preprocessor factory.
*
* @param {Object} args Config object of custom preprocessor.
* @param {Object} [config={}] Karma's config.
* @param {Object} logger Karma's logger.
* @param {Object} server Karma's server.
* @return {Function} the function to preprocess files.
*/
function createSassPreprocessor(args, config, logger, server) {
const preprocessorConfig = config.sassPreprocessor || {};
const log = logger.create('preprocessor.sass');
const options = merge({sourceMap: false}, args.options || {}, preprocessorConfig.options || {});
const transformPath =
args.transformPath ||
preprocessorConfig.transformPath ||
(filepath => `${path.dirname(filepath)}/${path.basename(filepath, path.extname(filepath))}.css`);
let watcher;
const dependencies = {};
const unlinked = [];
if (config.autoWatch) {
watcher = new FSWatcher({persistent: true, disableGlobbing: true})
.on('change', filePath => {
log.info('Changed file "%s".', filePath);
server.refreshFiles();
})
.on('add', filePath => {
if (unlinked.includes(filePath)) {
log.info('Added file "%s".', filePath);
server.refreshFiles();
}
})
.on('unlink', filePath => {
log.info('Deleted file "%s".', filePath);
unlinked.push(filePath);
server.refreshFiles();
});
}
return (content, file, done) => {
log.debug('Processing "%s".', file.originalPath);
file.path = transformPath(file.originalPath);
// Clone the options because we need to mutate them
const opts = {...options};
// Inline source maps
if (opts.sourceMap || opts.map) {
opts.sourceMap = true;
opts.sourceMapEmbed = true;
}
opts.indentedSyntax = file.originalPath.includes('.sass');
opts.file = file.originalPath;
opts.outFile = file.originalPath;
sass.render(opts, (err, result) => {
if (err) {
log.error('%s\n at %s:%d', err.message, file.originalPath, err.line);
return done(err, null);
}
if (
config.autoWatch &&
config.files.find(
configFile => configFile.watched && minimatch(file.originalPath, configFile.pattern, {dot: true})
)
) {
const fullPath = path.resolve(file.originalPath);
const includedFiles = [];
const startWatching = [];
const stopWatching = [];
for (let i = 0, {length} = result.stats.includedFiles; i < length; i++) {
const includedFile = path.resolve(result.stats.includedFiles[i]);
if (includedFile !== fullPath) {
includedFiles.push(includedFile);
if (!dependencies[includedFile]) {
startWatching.push(includedFile);
log.debug('Watching "%s"', includedFile);
dependencies[includedFile] = [fullPath];
} else if (!dependencies[includedFile].includes(fullPath)) {
dependencies[includedFile].push(fullPath);
}
}
}
for (let i = 0, keys = Object.keys(dependencies), {length} = keys; i < length; i++) {
if (!includedFiles.includes(keys[i])) {
const index = dependencies[keys[i]].indexOf(fullPath);
if (index !== -1) {
dependencies[keys[i]].splice(index, 1);
if (!dependencies[keys[i]].length > 0) {
stopWatching.push(keys[i]);
log.debug('Stop watching "%s"', keys[i]);
delete dependencies[keys[i]];
}
}
}
}
if (startWatching.length > 0) {
watcher.add(startWatching);
}
if (stopWatching.length > 0) {
watcher.unwatch(stopWatching);
}
}
if (opts.sourceMap && result.map) {
file.sourceMap = JSON.parse(result.map);
}
return done(null, result.css);
});
};
}
// Inject dependencies
createSassPreprocessor.$inject = ['args', 'config', 'logger', 'emitter'];
// Export preprocessor
module.exports = {'preprocessor:sass': ['factory', createSassPreprocessor]};