2 files changed, 68 insertions, 12 deletions

diff --git a/lib/utils/error.js b/lib/utils/error.js
index 27fa59d..d34c17e 100644
--- a/lib/utils/error.js
+++ b/lib/utils/error.js
@@ -32,6 +32,13 @@ var FileNotFoundError = TypedError({
     filename: null
 });
 
+// A file cannot be parsed
+var FileNotParsableError = TypedError({
+    type: 'file.not-parsable',
+    message: '"{filename}" file cannot be parsed',
+    filename: null
+});
+
 // A file is outside the scope
 var FileOutOfScopeError = TypedError({
     type: 'file.out-of-scope',
@@ -92,6 +99,7 @@ module.exports = {
     OutputError: OutputError,
     RequireInstallError: RequireInstallError,
 
+    FileNotParsableError: FileNotParsableError,
     FileNotFoundError: FileNotFoundError,
     FileOutOfScopeError: FileOutOfScopeError,
 
diff --git a/lib/utils/promise.js b/lib/utils/promise.js
index d49cf27..b0cfb34 100644
--- a/lib/utils/promise.js
+++ b/lib/utils/promise.js
@@ -1,16 +1,43 @@
 var Q = require('q');
-var _ = require('lodash');
+var Immutable = require('immutable');
 
-// Reduce an array to a promise
+/**
+    Reduce an array to a promise
+
+    @param {Array|List} arr
+    @param {Function(value, element, index)}
+    @return {Promise<Mixed>}
+*/
 function reduce(arr, iter, base) {
-    return _.reduce(arr, function(prev, elem, i) {
+    arr = Immutable.List(arr);
+
+    return arr.reduce(function(prev, elem, i) {
         return prev.then(function(val) {
             return iter(val, elem, i);
         });
     }, Q(base));
 }
 
-// Transform an array
+/**
+    Iterate over an array using an async iter
+
+    @param {Array|List} arr
+    @param {Function(value, element, index)}
+    @return {Promise}
+*/
+function forEach(arr, iter) {
+    return reduce(arr, function(val, el) {
+        return iter(el);
+    });
+}
+
+/**
+    Transform an array
+
+    @param {Array|List} arr
+    @param {Function(value, element, index)}
+    @return {Promise}
+*/
 function serie(arr, iter, base) {
     return reduce(arr, function(before, item, i) {
         return Q(iter(item, i))
@@ -21,9 +48,17 @@ function serie(arr, iter, base) {
     }, []);
 }
 
-// Iter over an array and return first result (not null)
+/**
+    Iter over an array and return first result (not null)
+
+    @param {Array|List} arr
+    @param {Function(element, index)}
+    @return {Promise<Mixed>}
+*/
 function some(arr, iter) {
-    return _.reduce(arr, function(prev, elem, i) {
+    arr = Immutable.List(arr);
+
+    return arr.reduce(function(prev, elem, i) {
         return prev.then(function(val) {
             if (val) return val;
 
@@ -32,7 +67,13 @@ function some(arr, iter) {
     }, Q());
 }
 
-// Map an array using an async (promised) iterator
+/**
+    Map an array using an async (promised) iterator
+
+    @param {Array|List} arr
+    @param {Function(element, index)}
+    @return {Promise<List>}
+*/
 function map(arr, iter) {
     return reduce(arr, function(prev, entry, i) {
         return Q(iter(entry, i))
@@ -43,18 +84,25 @@ function map(arr, iter) {
     }, []);
 }
 
-// Wrap a fucntion in a promise
+/**
+    Wrap a fucntion in a promise
+
+    @param {Function} func
+    @return {Funciton}
+*/
 function wrap(func) {
-    return _.wrap(func, function(_func) {
-        var args = Array.prototype.slice.call(arguments, 1);
+    return function() {
+        var args = Array.prototype.slice.call(arguments, 0);
+
         return Q()
         .then(function() {
-            return _func.apply(null, args);
+            return func.apply(null, args);
         });
-    });
+    };
 }
 
 module.exports = Q;
+module.exports.forEach = forEach;
 module.exports.reduce = reduce;
 module.exports.map = map;
 module.exports.serie = serie;