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miniflux/template/engine.go

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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
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package template // import "miniflux.app/template"
import (
"bytes"
"html/template"
"time"
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"miniflux.app/config"
"miniflux.app/errors"
"miniflux.app/locale"
"miniflux.app/logger"
"github.com/gorilla/mux"
)
// Engine handles the templating system.
type Engine struct {
templates map[string]*template.Template
funcMap *funcMap
}
func (e *Engine) parseAll() {
commonTemplates := ""
for _, content := range templateCommonMap {
commonTemplates += content
}
for name, content := range templateViewsMap {
logger.Debug("[Template] Parsing: %s", name)
e.templates[name] = template.Must(template.New("main").Funcs(e.funcMap.Map()).Parse(commonTemplates + content))
}
}
// Render process a template.
func (e *Engine) Render(name, language string, data interface{}) []byte {
tpl, ok := e.templates[name]
if !ok {
logger.Fatal("[Template] The template %s does not exists", name)
}
printer := locale.NewPrinter(language)
// Functions that need to be declared at runtime.
tpl.Funcs(template.FuncMap{
"elapsed": func(timezone string, t time.Time) string {
return elapsedTime(printer, timezone, t)
},
"t": func(key interface{}, args ...interface{}) string {
switch k := key.(type) {
case string:
return printer.Printf(k, args...)
case errors.LocalizedError:
return k.Localize(printer)
case *errors.LocalizedError:
return k.Localize(printer)
case error:
return k.Error()
default:
return ""
}
},
"plural": func(key string, n int, args ...interface{}) string {
return printer.Plural(key, n, args...)
},
})
var b bytes.Buffer
err := tpl.ExecuteTemplate(&b, "base", data)
if err != nil {
logger.Fatal("[Template] Unable to render template: %v", err)
}
return b.Bytes()
}
// NewEngine returns a new template engine.
func NewEngine(cfg *config.Config, router *mux.Router) *Engine {
tpl := &Engine{
templates: make(map[string]*template.Template),
funcMap: newFuncMap(cfg, router),
}
tpl.parseAll()
return tpl
}