main.go

package main

import (
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"text/template"
)

func main() {
	http.Handle("/", makeServer())
	log.Fatal(http.ListenAndServe(":8080", nil))
}

func makeServer() *server {
	root, err := os.Getwd()
	if err != nil {
		panic(err)
	}
	d, err := ioutil.ReadFile("template.html")
	if err != nil {
		panic(err)
	}
	return &server{
		root:     root,
		template: template.Must(template.New("template").Parse(string(d))),
	}
}

type server struct {
	root     string
	template *template.Template
}

func (s *server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	path := req.URL.Path
	b, err := ioutil.ReadFile(s.root + "/src" + path)
	if err != nil {
		log.Printf("serve %s: %s", path, err)
		http.Error(w, err.Error(), 500)
		return
	}
	v := struct {
		Title string
		Body  string
	}{
		Title: path,
		Body:  string(b),
	}
	if err := s.template.Execute(w, v); err != nil {
		log.Printf("serve %s: %s", path, err)
	}
}