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nikita-tokarch-uk/pkg/templates/templates.go

94 lines
2.0 KiB

package templates
import (
"bytes"
"embed"
"fmt"
"html/template"
"io/fs"
"reflect"
"github.com/sirupsen/logrus"
)
// Static go-templates source
//go:embed blog.go.tmpl
//go:embed error.go.tmpl
//go:embed head.go.tmpl
//go:embed index.go.tmpl
//go:embed menu.go.tmpl
//go:embed post.go.tmpl
//go:embed analytics.go.tmpl
var content embed.FS
// List of compiled go-templates
var Templates *template.Template = template.New("")
// Load embeded templates
func Load(funcs *Funcs) (err error) {
Templates.Funcs(funcs.Use())
tmplNames, err := fs.Glob(content, "*.go.tmpl")
if err != nil {
return fmt.Errorf("cannot match templates names using glob, %w", err)
}
buf := bytes.NewBuffer(nil)
for _, name := range tmplNames {
buf.Reset()
tmplContent, err := content.Open(name)
if err != nil {
return fmt.Errorf("cannot open template content, name:%s, %w", name, err)
}
size, err := buf.ReadFrom(tmplContent)
if err != nil {
return fmt.Errorf("cannot read template content, name:%s, %w", name, err)
}
tmpl, err := Templates.New(name).Parse(buf.String())
if err != nil {
return fmt.Errorf("cannot parse template, name:%s, %w", name, err)
}
logrus.Debugf("Found template: %s, size:%d", tmpl.Name(), size)
}
logrus.Debugf("Templates loading complete%s", Templates.DefinedTemplates())
return
}
// MustLookup wraps lookup function for the root template namespace
func MustLookup(name string) *template.Template {
tmpl := Templates.Lookup(name)
if tmpl == nil {
panic(fmt.Errorf("cannot find template %s", name))
}
return tmpl
}
// MustGetTemplateOf returns template which is mapped to the content data
func MustGetTemplateOf(content interface{}) (template *template.Template) {
el := reflect.TypeOf(content)
numField := el.NumField()
for i := 0; i < numField; i++ {
field := el.Field(i)
tag := field.Tag
found, ok := tag.Lookup("template")
if !ok {
continue
}
return MustLookup(found)
}
panic(fmt.Errorf("content %v does not have a template tag", content))
}