util.go

package goweb

import (
	"bytes"
	"net/url"
	"os"
	"regexp"
	"strconv"
	"strings"
	"time"
)

func ToString(str string, defaultvalue string) string {
	if str == "" {
		return defaultvalue
	}
	return str
}

func ToInt(str string, defaultvalue int) int {
	val, err := strconv.Atoi(str)
	if err != nil {
		return defaultvalue
	}
	return val
}

func ToBool(str string, defaultvalue bool) bool {
	val, err := strconv.ParseBool(str)
	if err != nil {
		return defaultvalue
	}
	return val
}

func webTime(t time.Time) string {
	ftime := t.Format(time.RFC1123)
	if strings.HasSuffix(ftime, "UTC") {
		ftime = ftime[0:len(ftime)-3] + "GMT"
	}
	return ftime
}

func dirExists(dir string) bool {
	d, e := os.Stat(dir)
	switch {
	case e != nil:
		return false
	case !d.IsDir():
		return false
	}

	return true
}

func fileExists(dir string) bool {
	info, err := os.Stat(dir)
	if err != nil {
		return false
	}

	return !info.IsDir()
}

func Urlencode(data map[string]string) string {
	var buf bytes.Buffer
	for k, v := range data {
		buf.WriteString(url.QueryEscape(k))
		buf.WriteByte('=')
		buf.WriteString(url.QueryEscape(v))
		buf.WriteByte('&')
	}
	s := buf.String()
	return s[0 : len(s)-1]
}

var slugRegex = regexp.MustCompile(`(?i:[^a-z0-9\-_])`)

func Slug(s string, sep string) string {
	if s == "" {
		return ""
	}
	slug := slugRegex.ReplaceAllString(s, sep)
	if slug == "" {
		return ""
	}
	quoted := regexp.QuoteMeta(sep)
	sepRegex := regexp.MustCompile("(" + quoted + "){2,}")
	slug = sepRegex.ReplaceAllString(slug, sep)
	sepEnds := regexp.MustCompile("^" + quoted + "|" + quoted + "$")
	slug = sepEnds.ReplaceAllString(slug, "")
	return strings.ToLower(slug)
}