add script to list changed files and do a branch diff

Author: zbhavyai

src/git_branch_diff.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+function update_branches() {
+    git fetch origin >/dev/null 2>&1 || true
+}
+
+function get_branch_diff() {
+    local COMPARE_WITH_BRANCH="${1}"
+    local BRANCH_TO_COMPARE="HEAD"
+    local FILES
+
+    echo "Running branch diff"
+    echo "Comparing: ${BRANCH_TO_COMPARE}"
+    echo "with     : ${COMPARE_WITH_BRANCH}"
+    echo
+
+    update_branches
+
+    FILES=$(git diff --name-only "${BRANCH_TO_COMPARE}...${COMPARE_WITH_BRANCH}")
+
+    if [ -z "${FILES}" ]; then
+        echo "No changes detected between branches."
+        return
+    fi
+
+    echo "Files changed..."
+    echo "${FILES}"
+    echo
+
+    echo "Generating branch diff..."
+    git diff --unified=5 "${BRANCH_TO_COMPARE}...${COMPARE_WITH_BRANCH}"
+}
+
+function main() {
+    if [[ $# -lt 1 ]]; then
+        echo "Usage: $0 BRANCH_TO_COMPARE_WITH"
+        exit 1
+    fi
+
+    get_branch_diff "$@"
+}
+
+main "$@"