userdiff: add Elixir to supported userdiff languages

Adds support for xfuncref in Elixir[1] language which is Ruby-like
language that runs on Erlang[3] Virtual Machine (BEAM).

[1]: https://elixir-lang.org
[2]: https://www.erlang.org

Signed-off-by: Łukasz Niemier <lukasz@niemier.pl>
Acked-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

11 files changed, 64 insertions, 0 deletions

diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
index 6f5ef0035e..c0f4839543 100755
--- a/t/t4018-diff-funcname.sh
+++ b/t/t4018-diff-funcname.sh
@@ -32,6 +32,7 @@ diffpatterns="
 	csharp
 	css
 	dts
+	elixir
 	fortran
 	fountain
 	golang
diff --git a/t/t4018/elixir-do-not-pick-end b/t/t4018/elixir-do-not-pick-end
new file mode 100644
index 0000000000..fae08ba7e8
--- /dev/null
+++ b/t/t4018/elixir-do-not-pick-end
@@ -0,0 +1,5 @@
+defmodule RIGHT do
+end
+#
+#
+# ChangeMe; do not pick up 'end' line
diff --git a/t/t4018/elixir-ex-unit-test b/t/t4018/elixir-ex-unit-test
new file mode 100644
index 0000000000..0560a2b697
--- /dev/null
+++ b/t/t4018/elixir-ex-unit-test
@@ -0,0 +1,6 @@
+defmodule Test do
+  test "RIGHT" do
+    assert true == true
+    assert ChangeMe
+  end
+end
diff --git a/t/t4018/elixir-function b/t/t4018/elixir-function
new file mode 100644
index 0000000000..d452f495a7
--- /dev/null
+++ b/t/t4018/elixir-function
@@ -0,0 +1,5 @@
+def function(RIGHT, arg) do
+  # comment
+  # comment
+  ChangeMe
+end
diff --git a/t/t4018/elixir-macro b/t/t4018/elixir-macro
new file mode 100644
index 0000000000..4f925e9ad4
--- /dev/null
+++ b/t/t4018/elixir-macro
@@ -0,0 +1,5 @@
+defmacro foo(RIGHT) do
+  # Code
+  # Code
+  ChangeMe
+end
diff --git a/t/t4018/elixir-module b/t/t4018/elixir-module
new file mode 100644
index 0000000000..91a4e7aa20
--- /dev/null
+++ b/t/t4018/elixir-module
@@ -0,0 +1,9 @@
+defmodule RIGHT do
+  @moduledoc """
+  Foo bar
+  """
+
+  def ChangeMe(a) where is_map(a) do
+    a
+  end
+end
diff --git a/t/t4018/elixir-module-func b/t/t4018/elixir-module-func
new file mode 100644
index 0000000000..c9910d0675
--- /dev/null
+++ b/t/t4018/elixir-module-func
@@ -0,0 +1,8 @@
+defmodule Foo do
+  def fun(RIGHT) do
+     # Code
+     # Code
+     # Code
+     ChangeMe
+  end
+end
diff --git a/t/t4018/elixir-nested-module b/t/t4018/elixir-nested-module
new file mode 100644
index 0000000000..771ebc5c42
--- /dev/null
+++ b/t/t4018/elixir-nested-module
@@ -0,0 +1,9 @@
+defmodule MyApp.RIGHT do
+  @moduledoc """
+  Foo bar
+  """
+
+  def ChangeMe(a) where is_map(a) do
+    a
+  end
+end
diff --git a/t/t4018/elixir-private-function b/t/t4018/elixir-private-function
new file mode 100644
index 0000000000..1aabe33b7a
--- /dev/null
+++ b/t/t4018/elixir-private-function
@@ -0,0 +1,5 @@
+defp function(RIGHT, arg) do
+  # comment
+  # comment
+  ChangeMe
+end
diff --git a/t/t4018/elixir-protocol b/t/t4018/elixir-protocol
new file mode 100644
index 0000000000..7d9173691e
--- /dev/null
+++ b/t/t4018/elixir-protocol
@@ -0,0 +1,6 @@
+defprotocol RIGHT do
+  @doc """
+  Calculates the size (and not the length!) of a data structure
+  """
+  def size(data, ChangeMe)
+end
diff --git a/t/t4018/elixir-protocol-implementation b/t/t4018/elixir-protocol-implementation
new file mode 100644
index 0000000000..f9234bbfc4
--- /dev/null
+++ b/t/t4018/elixir-protocol-implementation
@@ -0,0 +1,5 @@
+defimpl RIGHT do
+  # Docs
+  # Docs
+  def foo(ChangeMe), do: :ok
+end