From 1e00a63eaef380224acd4e153b0a7f2132b3fb0c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Enrique=20Garc=C3=ADa=20Cota?= <kikito@gmail.com>
Date: Sat, 14 Jan 2012 00:49:46 +0100
Subject: [PATCH] added < support

---
 semver.lua           | 18 +++++++++++++++++-
 spec/semver_spec.lua | 38 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/semver.lua b/semver.lua
index f35987d..47ba09a 100644
--- a/semver.lua
+++ b/semver.lua
@@ -11,6 +11,22 @@ local function checkPositiveInteger(number, name)
 end
 
 
+local mt = {
+  __eq = function(self, other)
+    return self.major == other.major and
+           self.minor == other.minor and
+           self.patch == other.patch
+  end,
+  __lt = function(self, other)
+    return self.major < other.major or
+           self.minor < other.minor or
+           self.patch < other.patch
+  end,
+  __tostring = function(self)
+    return ("%d.%d.%d"):format(self.major, self.minor, self.patch)
+  end
+}
+
 local function version(major, minor, patch)
   assert(major, "At least one parameter is needed")
 
@@ -27,7 +43,7 @@ local function version(major, minor, patch)
   checkPositiveInteger(minor, "minor")
   checkPositiveInteger(patch, "patch")
 
-  return {major=major, minor=minor, patch=patch}
+  return setmetatable({major=major, minor=minor, patch=patch}, mt)
 end
 
 return version
diff --git a/spec/semver_spec.lua b/spec/semver_spec.lua
index dd46abc..6f682a6 100644
--- a/spec/semver_spec.lua
+++ b/spec/semver_spec.lua
@@ -63,6 +63,42 @@ context('semver', function()
         assert_error(function() v("1.2.3foobar") end)
       end)
     end)
-
   end)
+
+  describe("tostring", function()
+    it("works with major, minor and patch", function()
+      assert_equal("1.2.3", tostring(v(1,2,3)))
+    end)
+  end)
+
+  describe("==", function()
+    it("is true when major, minor and patch are the same", function()
+      assert_equal(v(1,2,3), v'1.2.3')
+    end)
+    it("is false when major, minor and patch are not the same", function()
+      assert_not_equal(v(1,2,3), v(4,5,6))
+    end)
+  end)
+
+  describe("<", function()
+    test("true if major < minor", function()
+      assert_less_than(v'1.100.10', v'2.0.0')
+    end)
+    test("false if major > minor", function()
+      assert_greater_than(v'2', v'1')
+    end)
+    test("true if major = major but minor < minor", function()
+      assert_less_than(v'1.2.0', v'1.3.0')
+    end)
+    test("false if minor < minor", function()
+      assert_greater_than(v'1.1', v'1.0')
+    end)
+    test("true if major =, minor =, but patch <", function()
+      assert_less_than(v'0.0.1', v'0.0.10')
+    end)
+    test("false if major =, minor =, but patch >", function()
+      assert_greater_than(v'0.0.2', v'0.0.1')
+    end)
+  end)
+
 end)