Go's html/template with better subdirectory support.

gistfile1.go

package templates

import(
    "html/template"
    "io"
    "os"
    "strings"
    "path/filepath"
)

var templates map[string]*template.Template

func init() {
    selfPath, err := filepath.Abs(os.Args[0])
    if err != nil { panic(err) }
    selfDir := filepath.Dir(selfPath)
    collectTemplates(filepath.Join(selfDir, "templates"))
}

func Render(out io.Writer, name string, data interface{}) {
    if tmpl, ok := templates[name]; ok {
        err := tmpl.Execute(out, data)
        if err != nil { panic(err) }
    }
}

func collectTemplates(tmplDir string) {
    templates = make(map[string]*template.Template)
    prefix := tmplDir + "/"

    base, err := template.ParseFiles(filepath.Join(tmplDir, "base.html"))
    if err != nil { panic(err) }

    filepath.Walk(tmplDir, func(path string, info os.FileInfo, err error) error {
        if isTemplateFile(info) {
            key := strings.TrimPrefix(path, prefix)

            clone, err := base.Clone()
            if err != nil { panic(err) }

            _, err = clone.ParseFiles(path)
            if err != nil { panic(err) }

            templates[key] = clone
        }

        return nil
    })
}

func isTemplateFile(info os.FileInfo) bool {
    if info.Mode().IsRegular() {
        name := info.Name()
        if name != "base.html" && strings.HasSuffix(name, ".html") {
            return true
        }
    }

    return false
}