making 'no such task' errors a little nicer

lib/cake.js

@@ -1,11 +1,15 @@
 (function(){
-  var coffee, fs, path, print_tasks, tasks;
+  var coffee, fs, no_such_task, path, print_tasks, tasks;
   var __hasProp = Object.prototype.hasOwnProperty;
   // `cake` is a simplified version of Make (Rake, Jake) for CoffeeScript.
   fs = require('fs');
   path = require('path');
   coffee = require('coffee-script');
   tasks = {};
+  no_such_task = function no_such_task(task) {
+    process.stdio.writeError('No such task: "' + task + '"\n');
+    return process.exit(1);
+  };
   // Mixin the Cake functionality.
   process.mixin({
     // Define a task with a name, a description, and the action itself.
@@ -18,6 +22,9 @@
     },
     // Invoke another task in the Cakefile.
     invoke: function invoke(name) {
+      if (!(tasks[name])) {
+        no_such_task(name);
+      }
       return tasks[name].action();
     }
   });
@@ -59,10 +66,12 @@
         _a = []; _b = args;
         for (_c = 0; _c < _b.length; _c++) {
           arg = _b[_c];
-          if (!(tasks[arg])) {
+          _a.push((function() {
-            throw new Error('No such task: "' + arg + '"');
+            if (!(tasks[arg])) {
-          }
+              no_such_task(arg);
-          tasks[arg].action();
+            }
+            return tasks[arg].action();
+          }).call(this));
         }
         return _a;
       });

src/cake.coffee

@@ -6,6 +6,10 @@ coffee:   require 'coffee-script'
 
 tasks: {}
 
+no_such_task: (task) ->
+  process.stdio.writeError('No such task: "' + task + '"\n')
+  process.exit(1)
+
 # Mixin the Cake functionality.
 process.mixin {
 
@@ -15,6 +19,7 @@ process.mixin {
 
   # Invoke another task in the Cakefile.
   invoke: (name) ->
+    no_such_task name unless tasks[name]
     tasks[name].action()
 }
 
@@ -35,6 +40,6 @@ exports.run: ->
       eval coffee.compile source
       return print_tasks() unless args.length
       for arg in args
-        throw new Error('No such task: "' + arg + '"') unless tasks[arg]
+        no_such_task arg unless tasks[arg]
         tasks[arg].action()