Merge pull request #1683 from meh/fix-version

Fix handling pre/build data when minor/patch is missing in Mix.Version

lib/mix/lib/mix/version.ex

@@ -277,14 +277,17 @@ defmodule Mix.Version do
       end
     end
 
+    defp nillify(""), do: nil
+    defp nillify(o),  do: o
+
     @spec parse_version(String.t) :: { :ok, Mix.Version.matchable } | { :error, :invalid_version }
     def parse_version(string) when is_binary(string) do
       if valid_version?(string) do
         destructure [_, major, minor, patch, pre], Regex.run(@version_regex, string)
 
         major = binary_to_integer(major)
-        minor = binary_to_integer(minor || "0")
-        patch = binary_to_integer(patch || "0")
+        minor = binary_to_integer(minor |> nillify || "0")
+        patch = binary_to_integer(patch |> nillify || "0")
         pre   = pre && parse_pre(pre) || []
 
         { :ok, { major, minor, patch, pre } }

lib/mix/test/mix/version_test.exs

@@ -23,6 +23,13 @@ defmodule Mix.VersionTest do
     refute P.valid_requirement?(P.lexer("& 1.0.0", []))
   end
 
+  test :parse do
+    assert V.Schema[major: 1, minor: 0, patch: 0] = V.parse("1")
+    assert V.Schema[major: 1, minor: 2, patch: 0] = V.parse("1.2")
+    assert V.Schema[major: 1, minor: 2, patch: 3] = V.parse("1.2.3")
+    assert V.Schema[major: 1, minor: 4, patch: 0, pre: "5-g3318bd5"] = V.parse("1.4-5-g3318bd5")
+  end
+
   test :== do
     assert V.match?("2.3", "2.3")
     refute V.match?("2.4", "2.3")