Extract the good parts of node-repl into standalone library.

Now you can require("/repl.js") in your server to be able to examine it
while it's running.

bin/node-repl

@@ -1,43 +1,10 @@
 #!/usr/bin/env node
 
-node.stdio.open();
+puts("Welcome to the Node.js REPL.");
+puts("Enter ECMAScript at the prompt.");
+puts("Tip 1: Use 'rlwrap node-repl' for a better interface");
+puts("Tip 2: Type Control-D to exit.");
 
-var buffered_cmd = '';
+include("/repl.js");
-
-function prompt () {
-  node.stdio.write(buffered_cmd.length ? '...   ' : "\nnode> ");
-}
-
-node.stdio.write("Welcome to the Node.js REPL.\n");
-node.stdio.write("Enter ECMAScript at the prompt.\n");
-node.stdio.write("Type Control-D to exit.\n");
-node.stdio.write("For more information, see http://tinyclouds.org/node\n");
-
-prompt();
-
-var trimmer = /^\s*(.+)\s*$/m;
-
-node.stdio.addListener("data", function (cmd) {
-  var matches = trimmer.exec(cmd);
-
-  if (matches && matches.length == 2) {
-    cmd = matches[1];
-    try {
-      buffered_cmd += cmd;
-      try {
-        node.stdio.write(JSON.stringify(eval(buffered_cmd)) + "\n");
-        buffered_cmd = '';
-      } catch (e) { 
-        if (!(e instanceof SyntaxError)) 
-          throw e;
-      }
-    } catch (e) {
-      node.stdio.writeError('caught an exception: ' + e + '\n');
-      buffered_cmd = '';
-    }
-  }
-
-  prompt();
-});
 
 // vim:ft=javascript

lib/repl.js

@@ -0,0 +1,37 @@
+// A repl library that you can include in your own code to get a runtime
+// interface to your program. Just require("/repl.js").
+
+node.stdio.open();
+
+var buffered_cmd = '';
+var trimmer = /^\s*(.+)\s*$/m;
+
+exports.prompt = "node> ";
+
+function displayPrompt () {
+  print(buffered_cmd.length ? '...   ' : exports.prompt);
+}
+
+displayPrompt();
+
+node.stdio.addListener("data", function (cmd) {
+  var matches = trimmer.exec(cmd);
+
+  if (matches && matches.length == 2) {
+    cmd = matches[1];
+    try {
+      buffered_cmd += cmd;
+      try {
+        puts(JSON.stringify(eval(buffered_cmd)));
+        buffered_cmd = '';
+      } catch (e) { 
+        if (!(e instanceof SyntaxError)) 
+          throw e;
+      }
+    } catch (e) {
+      puts('caught an exception: ' + e);
+      buffered_cmd = '';
+    }
+  }
+  displayPrompt();
+});