Add `ruff-isort` formatter (#279)

`ruff` doesn't run isort as part of its format, so to maintain parity
with the sort rules that black/isort offer, this is the ruff isort.

---------

Co-authored-by: Radon Rosborough <radon@intuitiveexplanations.com>

3 files changed, 48 insertions, 0 deletions

diff --git a/test/formatters/installers/ruff-isort.bash b/test/formatters/installers/ruff-isort.bash
new file mode 100644
index 0000000..9f5bf1a
--- /dev/null
+++ b/test/formatters/installers/ruff-isort.bash
@@ -0,0 +1,2 @@
+apt-get install -y python3-pip
+pip install ruff
diff --git a/test/formatters/samplecode/ruff-isort/in.py b/test/formatters/samplecode/ruff-isort/in.py
new file mode 100644
index 0000000..5bd6f7f
--- /dev/null
+++ b/test/formatters/samplecode/ruff-isort/in.py
@@ -0,0 +1,20 @@
+from my_lib import Object
+
+import os
+
+from my_lib import Object3
+
+from my_lib import Object2
+
+import sys
+
+from third_party import lib15, lib1, lib2, lib3, lib4, lib5, lib6, lib7, lib8, lib9, lib10, lib11, lib12, lib13, lib14
+
+import sys
+
+from __future__ import absolute_import
+
+from third_party import lib3
+
+print("Hey")
+print("yo")
diff --git a/test/formatters/samplecode/ruff-isort/out.py b/test/formatters/samplecode/ruff-isort/out.py
new file mode 100644
index 0000000..f1d5c1c
--- /dev/null
+++ b/test/formatters/samplecode/ruff-isort/out.py
@@ -0,0 +1,26 @@
+from __future__ import absolute_import
+
+import os
+import sys
+
+from my_lib import Object, Object2, Object3
+from third_party import (
+    lib1,
+    lib2,
+    lib3,
+    lib4,
+    lib5,
+    lib6,
+    lib7,
+    lib8,
+    lib9,
+    lib10,
+    lib11,
+    lib12,
+    lib13,
+    lib14,
+    lib15,
+)
+
+print("Hey")
+print("yo")