add 6to5-node bin

README.md

@@ -71,6 +71,20 @@ Compile the file `script.js` and output it to stdout.
 
     $ 6to5 script.js
 
+#### Node
+
+Launch a repl.
+
+    $ 6to5-node
+
+Evaluate code.
+
+    $ 6to5-node -e "class Test { }"
+
+Compile and run `test.js`.
+
+    $ 6to5-node test
+
 ### Browserify
 
     $ browserify script.js -t 6to5/browserify --outfile bundle.js
@@ -166,3 +180,8 @@ Cannot subclass built-ins such as `Date`, `Array`, `DOM` etc.
 ## Comparison to Traceur
 
 ### Performance
+
+## The future
+
+Implement own parser and generator that preserves whitespace and automatically
+works out generation rules based on code input.

bin/6to5

@@ -3,9 +3,9 @@
 var commander = require("commander");
 var readdir   = require("fs-readdir-recursive");
 var mkdirp    = require("mkdirp");
-var to5       = require("../lib/6to5/node");
 var path      = require("path");
 var util      = require("../lib/6to5/util");
+var to5       = require("../lib/6to5/node");
 var fs        = require("fs");
 var _         = require("lodash");
 

bin/6to5-node

@@ -0,0 +1,61 @@
+#!/usr/bin/env node
+
+var commander = require("commander");
+var path      = require("path");
+var to5       = require("../lib/6to5/node");
+var util      = require("../lib/6to5/util");
+var path      = require("path");
+var repl      = require("repl");
+var vm        = require("vm");
+var _         = require("lodash");
+
+commander.option("-e, --eval [script]", "evaluate script");
+commander.option("-p, --print", "evaluate script and print result");
+
+var pkg = require("../package.json");
+commander.version(pkg.version);
+commander.usage("[options] [ -e script | script.js ] [arguments]");
+commander.parse(process.argv);
+
+to5.register();
+
+if (commander.eval) {
+  var code = to5.transform(commander.eval, { filename: "eval" });
+  var result = eval(code);
+  if (commander.print) console.log(result);
+} else {
+  var filenames = commander.args;
+
+  if (filenames.length) {
+    _.each(filenames, function (filename) {
+      require(require.resolve(path.join(process.cwd(), filename)));
+    });
+  } else {
+    replStart();
+  }
+}
+
+function replStart() {
+  repl.start({
+    prompt: "> ",
+    input: process.stdin,
+    output: process.stdout,
+    eval: replEval
+  });
+}
+
+function replEval(code, context, filename, callback) {
+  var err;
+  var result;
+
+  try {
+    code = code.slice(1, -2); // remove "(" and "\n)"
+    code = to5.transform(code, { filename: filename });
+
+    result = vm.runInContext(code, context, filename, { displayErrors: false });
+  } catch (e) {
+    err = e;
+  }
+
+  callback(err, result);
+}

lib/6to5/util.js

@@ -85,10 +85,10 @@ exports.buildUidGenerator = function () {
   var ids = {};
 
   return function (name) {
-    var i = ids[name] || 0;
+    var i = ids[name] || 1;
 
     var id = "_" + name;
-    if (i > 0) id += i;
+    if (i > 1) id += i;
     ids[name] = i + 1;
     return id;
   };

package.json

@@ -12,7 +12,8 @@
   "preferGlobal": true,
   "main": "lib/6to5/node.js",
   "bin": {
-    "6to5": "./bin/6to5"
+    "6to5": "./bin/6to5",
+    "6to5-node": "./bin/6to5-node"
   },
   "scripts": {
     "test": "mocha"