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build/node_modules/imagemin-pngout/index.js

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+'use strict';
+
+var isPng = require('is-png');
+var pngout = require('pngout-bin').path;
+var spawn = require('child_process').spawn;
+var through = require('through2');
+
+/**
+ * pngout imagemin plugin
+ *
+ * @param {Object} opts
+ * @api public
+ */
+
+module.exports = function (opts) {
+	opts = opts || {};
+
+	return through.ctor({ objectMode: true }, function (file, enc, cb) {
+		if (file.isNull()) {
+			cb(null, file);
+		}
+
+		if (file.isStream()) {
+			cb(new Error('Streaming is not supported'));
+			return;
+		}
+
+		if (!isPng(file.contents)) {
+			cb(null, file);
+			return;
+		}
+
+		var args = ['-', '-', '-y', '-force'];
+		var err = '';
+		var ret = [];
+		var len = 0;
+
+		if (typeof opts.strategy === 'number') {
+			args.push('-s', opts.strategy);
+		}
+
+		var cp = spawn(pngout, args);
+
+		cp.stderr.on('error', function (err) {
+			cb(err);
+		});
+
+		cp.stderr.setEncoding('utf8');
+		cp.stderr.on('data', function (data) {
+			err += data;
+		});
+
+		cp.stdout.on('data', function (data) {
+			ret.push(data);
+			len += data.length;
+		});
+
+		cp.on('close', function (code) {
+			if (code) {
+				cb(new Error(err));
+				return;
+			}
+
+			if (len < file.contents.length) {
+				file.contents = Buffer.concat(ret, len);
+			}
+
+			cb(null, file);
+		});
+
+		cp.stdin.end(file.contents);
+	});
+};