Revert changes in specified directory

revert-dir.sh

#!/bin/bash

# Usage: ./revert-dir.sh <target-branch> <relative-directory> [--dry-run]
# Example: ./revert-dir.sh main src/components --dry-run

set -e

TARGET_BRANCH=$1
TARGET_DIR=$2
DRY_RUN=$3

if [ -z "$TARGET_BRANCH" ] || [ -z "$TARGET_DIR" ]; then
  echo "Usage: $0 <target-branch> <relative-directory> [--dry-run]"
  exit 1
fi

# Get the merge base between current HEAD and target branch
BASE_COMMIT=$(git merge-base HEAD "$TARGET_BRANCH")

if [ "$DRY_RUN" == "--dry-run" ]; then
  echo "[Dry Run] Would revert $TARGET_DIR to its state from common ancestor with $TARGET_BRANCH ($BASE_COMMIT)."
  echo "Files that would change:"
  git diff --name-only "$BASE_COMMIT" -- "$TARGET_DIR"
else
  git checkout "$BASE_COMMIT" -- "$TARGET_DIR"
  echo "Reverted $TARGET_DIR to its state from common ancestor with $TARGET_BRANCH ($BASE_COMMIT)."
fi