From 4da2aaaa99f1e47e446f540b974858b2ff8a8b28 Mon Sep 17 00:00:00 2001
From: Philip Sampaio <philip.sampaio@gmail.com>
Date: Thu, 3 May 2012 00:46:48 -0300
Subject: [PATCH] Add File.exists?

---
 lib/file.ex               | 15 +++++++++++++++
 test/elixir/file_test.exs |  8 ++++++++
 2 files changed, 23 insertions(+)

diff --git a/lib/file.ex b/lib/file.ex
index 913f64633b..bbb2e165bb 100644
--- a/lib/file.ex
+++ b/lib/file.ex
@@ -28,6 +28,21 @@ defmodule File do
     FL.is_dir(directory)
   end
 
+  @doc """
+  Returns if `file` exists
+
+  ## Examples
+
+    File.exists?("/tmp")
+    #=> true
+
+    File.exists?("missing.txt")
+    #=> false
+  """
+  def exists?(filename) do
+    is_tuple(FL.last_modified(filename))
+  end
+
   @doc """
   Returns the last component of the `filename` or the file
   name itself if it does not contain any directory separators.
diff --git a/test/elixir/file_test.exs b/test/elixir/file_test.exs
index 362de53e7e..7f7977639b 100644
--- a/test/elixir/file_test.exs
+++ b/test/elixir/file_test.exs
@@ -32,6 +32,14 @@ defmodule FileTest do
     refute File.regular?("#{__FILE__}.unknown")
   end
 
+  test :exists do
+    assert File.exists?(__FILE__)
+    assert File.exists?(File.expand_path("../fixtures/foo.txt", __FILE__))
+
+    refute File.exists?("fixtures/missing.txt")
+    refute File.exists?("_missing.txt")
+  end
+
   test :basename_with_binary do
     assert File.basename("foo") == "foo"
     assert File.basename("/foo/bar") == "bar"