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template_helpers.go
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/
template_helpers.go
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package render
import (
"encoding/json"
"html/template"
"path/filepath"
"sync"
"github.com/gobuffalo/tags"
"github.com/pkg/errors"
)
var assetsMutex = &sync.Mutex{}
var assetMap map[string]string
func loadManifest(manifest string) error {
assetsMutex.Lock()
defer assetsMutex.Unlock()
err := json.Unmarshal([]byte(manifest), &assetMap)
return err
}
func assetPathFor(file string) string {
assetsMutex.Lock()
defer assetsMutex.Unlock()
filePath := assetMap[file]
if filePath == "" {
filePath = file
}
return filepath.Join("/assets", filePath)
}
func (s templateRenderer) addAssetsHelpers(helpers Helpers) Helpers {
helpers["assetPath"] = func(file string) (string, error) {
return s.assetPath(file)
}
helpers["javascriptTag"] = func(file string, options tags.Options) (template.HTML, error) {
h, err := s.assetPath(file)
if err != nil {
return "", errors.WithStack(err)
}
return jsTag(h, options), nil
}
helpers["stylesheetTag"] = func(file string, options tags.Options) (template.HTML, error) {
h, err := s.assetPath(file)
if err != nil {
return "", errors.WithStack(err)
}
return cssTag(h, options), nil
}
return helpers
}
func jsTag(src string, options tags.Options) template.HTML {
if options == nil {
options = tags.Options{}
}
if options["type"] == nil {
options["type"] = "text/javascript"
}
options["src"] = src
jsTag := tags.New("script", options)
return jsTag.HTML()
}
func cssTag(href string, options tags.Options) template.HTML {
if options == nil {
options = tags.Options{}
}
if options["rel"] == nil {
options["rel"] = "stylesheet"
}
if options["media"] == nil {
options["media"] = "screen"
}
options["href"] = href
cssTag := tags.New("link", options)
return cssTag.HTML()
}