test_modified_branch_files

#!/usr/bin/env bash

# Default base branch
base_branch="main"
opts=()

# Parse arguments
while [[ $# -gt 0 ]]; do
    case $1 in
        --base)
            base_branch="$2"
            shift 2
            ;;
        *)
            opts+=("$1")
            shift
            ;;
    esac
done

# Get current branch name
current_branch=$(git rev-parse --abbrev-ref HEAD)

# Get modified files based on whether we're on the base branch
if [[ "$current_branch" == "$base_branch" ]]; then
    # On base branch: get uncommitted changes
    file_paths=$(git diff --name-only HEAD | grep -E '\.exs?$' | grep -v "mix.exs" | grep -v "config/")
else
    # On feature branch: compare with base branch
    file_paths=$({ git diff --name-only "$base_branch"...HEAD; git diff --name-only HEAD; } | sort -u | grep -E '\.exs?$' | grep -v "mix.exs" | grep -v "config/")
fi

# Initialize array to store transformed paths
transformed_paths=()

# Process the file paths
for path in $file_paths; do
    if [[ $path == lib/* ]]; then
        # Replace 'lib/' with 'test/' and change '.ex' to '_test.exs'
        transformed_path=$(echo "$path" | sed -E 's|^lib/|test/|; s|\.ex$|_test.exs|')
        transformed_paths+=("$transformed_path")
    elif [[ $path == *_test.exs ]]; then
        # Only include files that end with _test.exs
        transformed_paths+=("$path")
    fi
done

# Output the mix test command if there are test files
if [[ ${#transformed_paths[@]} -gt 0 ]]; then
    echo "mix test ${opts[*]} ${transformed_paths[*]}"
    mix test "${opts[@]}" "${transformed_paths[@]}"
else
    echo "No test files ending with _test.exs found."
fi