index.js
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'use strict';
var gutil = require('gulp-util');
var path = require('path');
var rework = require('rework');
var reworkImport = require('rework-import');
var through = require('through2');
var parseImport = require('parse-import');
var reworkUrl = require('rework-plugin-url');
var defaults = require('lodash.defaults');
module.exports = function(destFile, options) {
var buffer = [];
var firstFile, commonBase;
var destDir = path.dirname(destFile);
var urlImportRules = [];
options = defaults({}, options, {
inlineImports: true,
rebaseUrls: true,
includePaths: []
});
return through.obj(function(file, enc, cb) {
var processedCss;
if (file.isStream()) {
this.emit('error', new gutil.PluginError('gulp-concat-css', 'Streaming not supported'));
return cb();
}
if(!firstFile) {
firstFile = file;
commonBase = file.base;
}
function urlPlugin(file) {
return reworkUrl(function(url) {
if(isUrl(url) || isDataURI(url) || path.extname(url) === '.css' || path.resolve(url) === url) {
return url;
}
var resourceAbsUrl = path.relative(commonBase, path.resolve(path.dirname(file), url));
resourceAbsUrl = path.relative(destDir, resourceAbsUrl);
//not all systems use forward slash as path separator
//this is required by urls.
if(path.sep === '\\'){
//replace with forward slash
resourceAbsUrl = resourceAbsUrl.replace(/\\/g, '/');
}
return resourceAbsUrl;
});
}
function collectImportUrls(styles) {
var outRules = [];
styles.rules.forEach(function(rule) {
if(rule.type !== 'import') {
return outRules.push(rule);
}
var importData = parseImport('@import ' + rule.import + ';');
var importPath = importData && importData[0].path;
if(isUrl(importPath) || !options.inlineImports) {
return urlImportRules.push(rule);
}
return outRules.push(rule);
});
styles.rules = outRules;
}
function processNestedImport(contents) {
var rew = rework(contents);
if(options.rebaseUrls) {
rew = rew.use(urlPlugin(this.source));
}
rew = rew.use(collectImportUrls);
return rew.toString();
}
try {
processedCss = rework(String(file.contents||""));
if(options.rebaseUrls) {
processedCss = processedCss.use(urlPlugin(file.path));
}
processedCss = processedCss.use(collectImportUrls);
if(options.inlineImports) {
processedCss = processedCss.use(reworkImport({
path: [
'.',
path.dirname(file.path)
].concat(options.includePaths),
transform: processNestedImport
}))
.toString();
}
processedCss = processedCss.toString();
} catch(err) {
this.emit('error', new gutil.PluginError('gulp-concat-css', err));
return cb();
}
buffer.push(processedCss);
cb();
}, function(cb) {
if(!firstFile) {
return cb();
}
var contents = urlImportRules.map(function(rule) {
return '@import ' + rule.import + ';';
}).concat(buffer).join(gutil.linefeed);
var concatenatedFile = new gutil.File({
base: firstFile.base,
cwd: firstFile.cwd,
path: path.join(firstFile.base, destFile),
contents: new Buffer(contents)
});
this.push(concatenatedFile);
cb();
});
};
function isUrl(url) {
return (/^([\w]+:)?\/\/./).test(url);
}
function isDataURI(url) {
return url && url.indexOf('data:') === 0;
}