load parsed files into template go

template.go

package main

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

// ParseTemplateDir parse dirs
// Example: var templates = template.Must(ParseTemplateDir("templates"))
func ParseTemplateDir(dir string) (*template.Template, error) {
	var paths []string
	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		if !info.IsDir() {
			paths = append(paths, path)
		}
		return nil
	})
	if err != nil {
		return nil, err
	}
	return template.ParseFiles(paths...)
}

templates_test.go

package main

import (
	"os"
	"testing"
)

type TemplateData struct {
	SITENAME string
	SITEURL  string
}

func TestTemplateToHtml(t *testing.T) {
	data := TemplateData{
		SITENAME: "Theory and Practice",
		SITEURL:  "https://gist.github.com/",
	}

	tmpl, err := template.Must(ParseTemplateDir("templates"))
	if err != nil {
		t.Error(err)
	}
	err = tmpl.ExecuteTemplate(os.Stdout, "index.html", &data)
	if err != nil {
		t.Error(err)
	}
}