refs #5: add - basic repl for node.js 4.2.3

nodejs4.2.3/package.json

@@ -6,7 +6,7 @@
 	"main": "/home/sorna/run.js",
 	"author": "Jonghyun Park <adrysn@lablup.com>",
 	"dependencies": {
-		"express": "4.x",
+		"process": "*",
 		"zmq": "2.14.0"
 	}
 }

nodejs4.2.3/run.js

@@ -1,10 +1,76 @@
-var express = require('express');
-var PORT = 2001;
-
-var app = express();
-app.get('/', function(req, resp) {
-  resp.send('Hello world\n');
-});
-
-app.listen(PORT);
-console.log('success!! port: ', PORT);
+var main = function() {
+    var process = require('process');
+    var zmq = require('zmq');
+    var socket = zmq.socket('rep');
+    var port = 'tcp://*:2001';
+
+    // refs: https://gist.github.com/pguillory/729616
+    function hook_stdout(callback) {
+        var old_stdout_write = process.stdout.write;
+        process.stdout.write = (function(write) {
+            return function(string, encoding, fd) {
+                write.apply(process.stdout, arguments);
+                callback(string, encoding, fd);
+            };
+        })(process.stdout.write);
+        return function() {
+            process.stdout.write = old_stdout_write;
+        }
+    }
+
+    function hook_stderr(callback) {
+        var old_stderr_write = process.stderr.write;
+        process.stderr.write = (function(write) {
+            return function(string, encoding, fd) {
+                write.apply(process.stderr, arguments);
+                callback(string, encoding, fd);
+            };
+        })(process.stderr.write);
+        return function() {
+            process.stderr.write = old_stderr_write;
+        }
+    }
+
+    function execute(code) {
+        eval(code);
+    }
+
+    process.chdir('/home/work');
+
+    socket.on('message', function(code_id, code) {
+        var stdout = '';
+        var stderr = '';
+        var exceptions = [];  // exceptions not supported yet
+        var unhook_stdout = hook_stdout(function(string, encoding, fd) {
+           stdout += string;
+        });
+        var unhook_stderr = hook_stderr(function(string, encoding, fd) {
+           stderr += string;
+        });
+        execute(code.toString());
+        var result = {
+            'stdout': stdout,
+            'stderr': stderr,
+            'exceptions': exceptions
+        };
+        socket.send(JSON.stringify(result));
+        unhook_stdout();
+        unhook_stderr();
+    });
+
+    socket.on('SIGINT', function() {
+        socket.close();
+    });
+
+    socket.bind(port, function(err) {
+        if (err) {
+            throw err;
+        } else {
+            console.log('Serving at ' + port + '...');
+        }
+    });
+}
+
+if (require.main === module) {
+    main();
+}