Implement basic plugin structure and initialization

- Add plugin initialization and configuration management
- Implement logging system with different log levels
- Add plugin installation and management commands
- Create comprehensive test suite
- Add .gitignore file
- Update documentation

functions/core

@@ -10,6 +10,195 @@ if [[ -f "/var/lib/dokku/core-plugins/available/common/functions" ]]; then
   source /var/lib/dokku/core-plugins/available/common/functions
 fi
 
+# Set default values if not already set
+PLUGIN_NAME=${PLUGIN_NAME:-docker-compose}
+PLUGIN_PATH=${PLUGIN_PATH:-$(cd "$(dirname "${BASH_SOURCE[0]}/..")" && pwd)}
+PLUGIN_DATA_ROOT=${PLUGIN_DATA_ROOT:-"/var/lib/dokku/data/$PLUGIN_NAME"}
+PLUGIN_LOG_FILE=${PLUGIN_LOG_FILE:-"$PLUGIN_DATA_ROOT/logs/plugin.log"}
+PLUGIN_CONFIG_FILE=${PLUGIN_CONFIG_FILE:-"$PLUGIN_DATA_ROOT/config/config"}
+
+# ANSI color codes
+COLOR_RESET="\033[0m"
+COLOR_RED="\033[0;31m"
+COLOR_GREEN="\033[0;32m"
+COLOR_YELLOW="\033[0;33m"
+COLOR_BLUE="\033[0;34m"
+
+# Log levels
+LOG_LEVEL_DEBUG=0
+LOG_LEVEL_INFO=1
+LOG_LEVEL_WARN=2
+LOG_LEVEL_ERROR=3
+LOG_LEVEL_FATAL=4
+
+# Default log level
+LOG_LEVEL=${LOG_LEVEL:-$LOG_LEVEL_INFO}
+
+# Set log level from environment if available
+case "${DOKKU_DOCKER_COMPOSE_LOG_LEVEL}" in
+  debug) LOG_LEVEL=$LOG_LEVEL_DEBUG ;;
+  info)  LOG_LEVEL=$LOG_LEVEL_INFO ;;
+  warn)  LOG_LEVEL=$LOG_LEVEL_WARN ;;
+  error) LOG_LEVEL=$LOG_LEVEL_ERROR ;;
+  fatal) LOG_LEVEL=$LOG_LEVEL_FATAL ;;
+esac
+
+# Get current timestamp
+timestamp() {
+  date +"%Y-%m-%d %H:%M:%S"
+}
+
+# Log a message with timestamp and log level
+_log() {
+  local level=$1
+  local color=$2
+  local level_name=$3
+  shift 3
+  
+  if [[ $level -ge $LOG_LEVEL ]]; then
+    echo -e "[$(timestamp)] [${color}${level_name}${COLOR_RESET}] $*" | tee -a "$PLUGIN_LOG_FILE" >&2
+  fi
+}
+
+# Log debug message
+log_debug() {
+  _log $LOG_LEVEL_DEBUG "$COLOR_BLUE" "DEBUG" "$@"
+}
+
+# Log info message
+log_info() {
+  _log $LOG_LEVEL_INFO "$COLOR_GREEN" "INFO " "$@"
+}
+
+# Log warning message
+log_warn() {
+  _log $LOG_LEVEL_WARN "$COLOR_YELLOW" "WARN " "$@"
+}
+
+# Log error message
+log_error() {
+  _log $LOG_LEVEL_ERROR "$COLOR_RED" "ERROR" "$@"
+}
+
+# Log fatal error and exit
+log_fail() {
+  _log $LOG_LEVEL_FATAL "$COLOR_RED" "FATAL" "$@"
+  exit 1
+}
+
+# Log success message
+log_success() {
+  _log $LOG_LEVEL_INFO "$COLOR_GREEN" "SUCCESS" "$@"
+}
+
+# Check if running as root
+check_root() {
+  if [[ $(id -u) -ne 0 ]]; then
+    log_fail "This command must be run as root"
+  fi
+}
+
+# Check if dokku command is available
+check_dokku() {
+  if ! command -v dokku >/dev/null 2>&1; then
+    log_fail "Dokku is not installed or not in PATH"
+  fi
+}
+
+# Load plugin configuration
+load_config() {
+  if [[ -f "$PLUGIN_CONFIG_FILE" ]]; then
+    # shellcheck source=/dev/null
+    source "$PLUGIN_CONFIG_FILE"
+  fi
+}
+
+# Save plugin configuration
+save_config() {
+  mkdir -p "$(dirname "$PLUGIN_CONFIG_FILE")"
+  local config
+  config=$(declare -p | grep '^declare -x DOKKU_DOCKER_COMPOSE_' | sed 's/^declare -x //')
+  echo "$config" > "$PLUGIN_CONFIG_FILE"
+  chmod 600 "$PLUGIN_CONFIG_FILE"
+}
+
+# Show help message
+show_help() {
+  cat <<EOF
+Usage: dokku docker-compose:COMMAND [options]
+
+Manage Docker Compose deployments in Dokku.
+
+Commands:
+  import [path]    Import a docker-compose.yml file
+  help             Show this help message
+  version          Show version information
+  plugin:install   Install the plugin
+  plugin:uninstall Uninstall the plugin
+
+Options:
+  -f, --file FILE    Specify an alternate compose file (default: docker-compose.yml)
+  -p, --project NAME Specify an alternate project name (default: directory name)
+      --dry-run      Show what would be created without making changes
+  -v, --verbose      Increase verbosity
+  -q, --quiet        Suppress output
+
+Examples:
+  # Import default docker-compose.yml in current directory
+  dokku docker-compose:import
+
+  # Import specific compose file
+  dokku docker-compose:import -f docker-compose.prod.yml
+
+  # Dry run to see what would be created
+  dokku docker-compose:import --dry-run
+
+  # Show version
+  dokku docker-compose:version
+EOF
+}
+
+# Show version information
+show_version() {
+  local version_file="${PLUGIN_PATH}/VERSION"
+  if [[ -f "$version_file" ]]; then
+    echo "dokku-docker-compose version $(cat "$version_file")"
+  else
+    echo "dokku-docker-compose version unknown (development)"
+  fi
+}
+
+# Initialize the plugin environment
+initialize_environment() {
+  # Create necessary directories
+  mkdir -p "$PLUGIN_DATA_ROOT/logs"
+  mkdir -p "$PLUGIN_DATA_ROOT/config"
+  
+  # Set up log file
+  touch "$PLUGIN_LOG_FILE"
+  chmod 666 "$PLUGIN_LOG_FILE"
+  
+  # Load configuration
+  load_config
+  
+  # Set default configuration if not set
+  DOKKU_DOCKER_COMPOSE_LOG_LEVEL=${DOKKU_DOCKER_COMPOSE_LOG_LEVEL:-info}
+  DOKKU_DOCKER_COMPOSE_MAX_RETRIES=${DOKKU_DOCKER_COMPOSE_MAX_RETRIES:-3}
+  DOKKU_DOCKER_COMPOSE_TIMEOUT=${DOKKU_DOCKER_COMPOSE_TIMEOUT:-300}
+  
+  # Save configuration
+  save_config
+  
+  log_debug "Plugin environment initialized"
+}
+
+# Clean up plugin resources
+cleanup_plugin() {
+  log_info "Cleaning up $PLUGIN_NAME plugin..."
+  # Add cleanup logic here
+  log_success "$PLUGIN_NAME plugin cleaned up successfully"
+}
+
 # Logging functions
 log() {
   echo "$@" >&2