From 37860d174e39bee68d0d23bbc294ebb0aec32ff1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Andr=C3=A9=20Freiheit?= <marcandre@freiheit.software>
Date: Thu, 16 Jan 2020 15:16:12 +0200
Subject: [PATCH] Add simple function to detect file changes between two
 commits

---
 src/git.sh     | 12 ++++++++++++
 tests/git.bats | 25 +++++++++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 src/git.sh
 create mode 100644 tests/git.bats

diff --git a/src/git.sh b/src/git.sh
new file mode 100644
index 0000000..53ede32
--- /dev/null
+++ b/src/git.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env
+
+set -o errexit
+set -o pipefail
+
+
+function files_changed() {
+  FROM_COMMIT=$1
+  TO_COMMIT=$2
+
+  git diff --name-only $FROM_COMMIT..$TO_COMMIT
+}
diff --git a/tests/git.bats b/tests/git.bats
new file mode 100644
index 0000000..77de1d0
--- /dev/null
+++ b/tests/git.bats
@@ -0,0 +1,25 @@
+#!/usr/bin/env bats
+
+setup() {
+  source src/git.sh
+}
+
+@test "git>file_changes recognizes added files as changed files" {
+  FROM_COMMIT=7c5b539
+  TO_COMMIT=b108196
+
+  run files_changed $FROM_COMMIT $TO_COMMIT  
+
+  [ $status -eq 0 ]
+  [ "${lines[1]}" = "tests/it-works.bats" ]
+}
+
+
+@test "git>file_changes recognizes modified files as changed files" {
+  FROM_COMMIT=7c5b539
+  TO_COMMIT=b108196
+
+  run files_changed $FROM_COMMIT $TO_COMMIT  
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "README.md" ]
+}