package main

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

func queryPath(path string, cb func(string) bool) error {
	return filepath.Walk(path, func(path string, f os.FileInfo, err error) error {
		if f == nil {
			return err
		}
		if f.IsDir() {
			return nil
		}
		if cb(path) {
			return nil
		}
		return errors.New("call cb return false")
	})
}

func findPath(path, expr string) (list []string, err error) {
	list = make([]string, 0)
	reg, e := regexp.Compile(expr)
	if e != nil {
		err = e
		return
	}
	err = queryPath(path, func(path string) bool {
		if expr == "" || reg.MatchString(path) {
			list = append(list, path)
		}
		return true
	})
	return
}

func splitPath(p string) (dir, name, ext, namewithoutext string) {
	dir, name = filepath.Split(p)
	ext = filepath.Ext(name)
	n := strings.LastIndex(name, ".")
	if n > 0 {
		namewithoutext = name[:n]
	}
	return
}