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template.go
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template.go
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package gopher
import (
"bytes"
"encoding/json"
"fmt"
"html/template"
"io/ioutil"
"strings"
"time"
"github.com/jimmykuu/webhelpers"
"github.com/jimmykuu/wtforms"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
const (
BASE = "base.html"
ADMIN = "admin/base.html"
)
var funcMaps = template.FuncMap{
"html": func(text string) template.HTML {
return template.HTML(text)
},
"input": func(form wtforms.Form, fieldStr string) template.HTML {
field, err := form.Field(fieldStr)
if err != nil {
panic(err)
}
errorClass := ""
errorMessage := ""
if field.HasErrors() {
errorClass = "error "
errorMessage = `<div class="ui red pointing above ui label">` + strings.Join(field.Errors(), ", ") + `</div>`
}
format := `<div class="%sfield">
%s
%s
%s
</div>`
return template.HTML(
fmt.Sprintf(format,
errorClass,
field.RenderLabel(),
field.RenderInput(),
errorMessage,
))
},
"loadtimes": func(startTime time.Time) string {
// 加载时间
return fmt.Sprintf("%dms", time.Now().Sub(startTime)/1000000)
},
"ads": func(position string, db *mgo.Database) []AD {
c := db.C(ADS)
var ads []AD
c.Find(bson.M{"position": position}).Sort("index").All(&ads)
count := len(ads)
if count <= 1 {
return ads
}
dayIndex := time.Now().YearDay() % count
var sortAds = make([]AD, count)
// 根据当天是一年的内第几天排序,每个广告都有机会排第一个
for i, ad := range ads {
sortAds[(i+count-dayIndex)%count] = ad
}
return sortAds
},
"url": func(url string) string {
// 没有http://或https://开头的增加http://
if strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://") {
return url
}
return "http://" + url
},
"add": func(a, b int) int {
// 加法运算
return a + b
},
"formatdate": func(t time.Time) string {
// 格式化日期
return t.Format(time.RFC822)
},
"formattime": func(t time.Time) string {
// 格式化时间
now := time.Now()
duration := now.Sub(t)
if duration.Seconds() < 60 {
return fmt.Sprintf("刚刚")
} else if duration.Minutes() < 60 {
return fmt.Sprintf("%.0f 分钟前", duration.Minutes())
} else if duration.Hours() < 24 {
return fmt.Sprintf("%.0f 小时前", duration.Hours())
}
t = t.Add(time.Hour * time.Duration(Config.TimeZoneOffset))
return t.Format("2006-01-02 15:04")
},
"formatdatetime": func(t time.Time) string {
// 格式化时间成 2006-01-02 15:04:05
return t.Add(time.Hour * time.Duration(Config.TimeZoneOffset)).Format("2006-01-02 15:04:05")
},
"nl2br": func(text string) template.HTML {
return template.HTML(strings.Replace(text, "\n", "<br>", -1))
},
"truncate": func(text string, length int, indicator string) string {
return webhelpers.Truncate(text, length, indicator)
},
"include": func(filename string, data map[string]interface{}) template.HTML {
// 加载局部模板,从 templates 中去寻找
var buf bytes.Buffer
t, err := template.ParseFiles("templates/" + filename)
if err != nil {
panic(err)
}
err = t.Execute(&buf, data)
if err != nil {
panic(err)
}
return template.HTML(buf.Bytes())
},
}
// 解析模板
func parseTemplate(file, baseFile string, data map[string]interface{}) []byte {
var buf bytes.Buffer
t := template.New(file).Funcs(funcMaps)
baseBytes, err := ioutil.ReadFile("templates/" + baseFile)
if err != nil {
panic(err)
}
t, err = t.Parse(string(baseBytes))
if err != nil {
panic(err)
}
t, err = t.ParseFiles("templates/" + file)
if err != nil {
panic(err)
}
err = t.Execute(&buf, data)
if err != nil {
panic(err)
}
return buf.Bytes()
}
// 渲染模板,并放入一些模板常用变量
func renderTemplate(handler Handler, file, baseFile string, data map[string]interface{}) {
_, isPresent := data["signout"]
// 如果isPresent==true,说明在执行登出操作
if !isPresent {
// 加入用户信息
user, ok := currentUser(&handler)
if ok {
data["curr_user"] = user
data["username"] = user.Username
data["isSuperUser"] = user.IsSuperuser
data["email"] = user.Email
data["fansCount"] = len(user.Fans)
data["followCount"] = len(user.Follow)
}
}
data["utils"] = utils
data["analyticsCode"] = analyticsCode
data["staticFileVersion"] = Config.StaticFileVersion
data["goVersion"] = goVersion
data["startTime"] = handler.StartTime
data["db"] = handler.DB
data["host"] = Config.Host
_, ok := data["active"]
if !ok {
data["active"] = ""
}
page := parseTemplate(file, baseFile, data)
handler.ResponseWriter.Write(page)
}
func renderJson(handler Handler, data interface{}) {
b, err := json.Marshal(data)
if err != nil {
panic(err)
}
handler.ResponseWriter.Header().Set("Content-Type", "application/json")
handler.ResponseWriter.Write(b)
}