Cleaned up return logic

- ReturnNodes are explicitly added during compilation
 - ReturnNode is used instead of scattering "return" throughout
   code compilation snippets
 - nodes gain a make_return method in order to do the most useful
   thing when a return is requested

lib/command.js

@@ -74,6 +74,7 @@
       _a.push(compile(source));
     }
     return _a;
+    return null;
   };
   // Compile a single source script, containing the given code, according to the
   // requested options. Both compile_scripts and watch_scripts share this method
@@ -99,14 +100,18 @@
         } else if (o.lint) {
           return lint(js);
         }
+        return null;
       }
+      return null;
     } catch (err) {
       if (o.watch) {
         return puts(err.message);
       } else {
         throw err;
       }
+      return null;
     }
+    return null;
   };
   // Attach the appropriate listeners to compile scripts incoming over **stdin**,
   // and write them back to **stdout**.
@@ -118,6 +123,7 @@
       if (string) {
         return code += string;
       }
+      return null;
     });
     return process.stdio.addListener('close', function() {
       return compile_script('stdio', code);
@@ -147,6 +153,7 @@
       _a.push(watch(source));
     }
     return _a;
+    return null;
   };
   // Write out a JavaScript source file with the compiled code. By default, files
   // are written out in `cwd` as `.js` files with the same name, but the output
@@ -167,11 +174,13 @@
       if (result) {
         return puts(result.replace(/\n/g, ''));
       }
+      return null;
     });
     jsl.addListener('error', function(result) {
       if (result) {
         return puts(result);
       }
+      return null;
     });
     jsl.write(js);
     return jsl.close();
@@ -191,6 +200,7 @@
         }).call(this));
       }
       return _a;
+      return null;
     }).call(this);
     return puts(strings.join(' '));
   };
@@ -202,7 +212,8 @@
     o = (options = option_parser.parse(process.argv));
     options.run = !(o.compile || o.print || o.lint);
     options.print = !!(o.print || (o.eval || o.stdio && o.compile));
-    return sources = options.arguments.slice(2, options.arguments.length);
+    sources = options.arguments.slice(2, options.arguments.length);
+    return sources;
   };
   // The compile-time options to pass to the CoffeeScript compiler.
   compile_options = function compile_options(source) {