#!/bin/sh

# This script sets up a Git pre-commit hook to automatically format C/C++ files
# in the 'software/' subdirectory using clang-format.

# Define the path for the pre-commit hook
HOOK_DIR=".git/hooks"
HOOK_FILE="$HOOK_DIR/pre-commit"

# Create the hooks directory if it doesn't exist
mkdir -p "$HOOK_DIR"

# Create the pre-commit hook script using a 'here document'
cat > "$HOOK_FILE" << 'EOF'
#!/bin/sh

# --- Pre-commit hook for clang-format ---
#
# This hook formats staged C, C++, and Objective-C files in the 'software/'
# subdirectory before a commit is made.
# It automatically finds the .clang-format file in the software/ directory.
#

# Directory to be formatted
TARGET_DIR="software/"

# Use git diff to find staged files that are Added (A), Copied (C), or Modified (M).
# We filter for files only within the TARGET_DIR.
# The grep regex matches common C/C++ and Objective-C file extensions.
FILES_TO_FORMAT=$(git diff --cached --name-only --diff-filter=ACM "$TARGET_DIR" | grep -E '\.(c|h|cpp|hpp|cxx|hxx|cc|hh|m|mm)$')

if [ -z "$FILES_TO_FORMAT" ]; then
    # No relevant files to format, exit successfully.
    exit 0
fi

echo "› Running clang-format on staged files in '$TARGET_DIR'..."

# Run clang-format in-place on the identified files.
# clang-format will automatically find the .clang-format file in the software/ directory
# or any of its parent directories.
echo "$FILES_TO_FORMAT" | xargs clang-format -i

# Since clang-format may have changed the files, we need to re-stage them.
echo "$FILES_TO_FORMAT" | xargs git add

echo "› Formatting complete."

exit 0
EOF

# Make the hook executable
chmod +x "$HOOK_FILE"

echo "✅ Git pre-commit hook has been set up successfully."
echo "   It will now automatically format files in the '$PWD/software' directory before each commit."