package main

import (
	"errors"
	"os"
	"path/filepath"
)

type Conf struct {
	Source string
	Dest   string
}

func loadConf() (*Conf, error) {
	source := os.Getenv("CONF_SOURCE")
	info, err := os.Stat(source)
	if err != nil {
		return nil, err
	}
	if !info.IsDir() {
		return nil, errors.New("CONF_SOURCE is not a directory")
	}
	home, err := os.UserHomeDir()
	if err != nil {
		return nil, err
	}
	return &Conf{Source: source, Dest: home}, nil
}

func (c *Conf) FileNames() ([]string, error) {
	var names []string
	dir := filepath.Join(c.Source, "templates")
	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		if info.IsDir() {
			return nil
		}
		name, err := filepath.Rel(dir, path)
		if err != nil {
			return err
		}
		names = append(names, name)
		return nil
	})
	if err != nil {
		return nil, err
	}
	return names, nil
}