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'use strict';
var through = require('through2');
var path = require('path');
var File = require('vinyl');
var Concat = require('concat-with-sourcemaps');
// file can be a vinyl file object or a string
// when a string it will construct a new one
module.exports = function(file, opt) {
if (!file) {
throw new Error('gulp-concat: Missing file option');
}
opt = opt || {};
// to preserve existing |undefined| behaviour and to introduce |newLine: ""| for binaries
if (typeof opt.newLine !== 'string') {
opt.newLine = '\n';
}
var isUsingSourceMaps = false;
var latestFile;
var latestMod;
var fileName;
var concat;
if (typeof file === 'string') {
fileName = file;
} else if (typeof file.path === 'string') {
fileName = path.basename(file.path);
} else {
throw new Error('gulp-concat: Missing path in file options');
}
function bufferContents(file, enc, cb) {
// ignore empty files
if (file.isNull()) {
cb();
return;
}
// we don't do streams (yet)
if (file.isStream()) {
this.emit('error', new Error('gulp-concat: Streaming not supported'));
cb();
return;
}
// enable sourcemap support for concat
// if a sourcemap initialized file comes in
if (file.sourceMap && isUsingSourceMaps === false) {
isUsingSourceMaps = true;
}
// set latest file if not already set,
// or if the current file was modified more recently.
if (!latestMod || file.stat && file.stat.mtime > latestMod) {
latestFile = file;
latestMod = file.stat && file.stat.mtime;
}
// construct concat instance
if (!concat) {
concat = new Concat(isUsingSourceMaps, fileName, opt.newLine);
}
// add file to concat instance
concat.add(file.relative, file.contents, file.sourceMap);
cb();
}
function endStream(cb) {
// no files passed in, no file goes out
if (!latestFile || !concat) {
cb();
return;
}
var joinedFile;
// if file opt was a file path
// clone everything from the latest file
if (typeof file === 'string') {
joinedFile = latestFile.clone({contents: false});
joinedFile.path = path.join(latestFile.base, file);
} else {
joinedFile = new File(file);
}
joinedFile.contents = concat.content;
if (concat.sourceMapping) {
joinedFile.sourceMap = JSON.parse(concat.sourceMap);
}
this.push(joinedFile);
cb();
}
return through.obj(bufferContents, endStream);
};
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