tutorial wiki project using the most awesome 'go' language from the golang site

wiki.go

package main

import (
        "html/template"
        "io/ioutil"
        "net/http"
        "regexp"
        )

type Page struct {
    Title string
    Body []byte
}

const pathLength = 6 // The length of '/view/', '/edit/' and '/save/'

var templates = template.Must(template.ParseFiles("edit.html", "view.html"))
var titleValidator = regexp.MustCompile("^[a-zA-Z0-9]+$")

func (p *Page) save() error {
    filename := p.Title + ".txt"
    return ioutil.WriteFile(filename, p.Body, 0600)
}

func loadPage(title string) (*Page, error) {
    filename := title + ".txt"
    body, err := ioutil.ReadFile(filename)
    if err != nil {
        return nil, err
    }
    return &Page{Title: title, Body: body}, nil
}


func renderTemplate(w http.ResponseWriter, tpl string, p *Page) {
    err := templates.ExecuteTemplate(w, tpl+".html", p)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
    }
}

func makeHandler(fn func (http.ResponseWriter, *http.Request, string)) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        title := r.URL.Path[pathLength:]
        if !titleValidator.MatchString(title) {
            http.NotFound(w, r)
            return
        }
        fn(w, r, title)
    }
}

func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
    p, err := loadPage(title)
    if err != nil {
        http.Redirect(w, r, "/edit/"+title, http.StatusFound)
        return
    }
    renderTemplate(w, "view", p)
}

func editHandler(w http.ResponseWriter, r *http.Request, title string) {
    p, err := loadPage(title)
    if err != nil {
        p = &Page{Title: title}
    }
    renderTemplate(w, "edit", p)
}

func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
    body := r.FormValue("body")
    p := &Page{Title: title, Body: []byte(body)}
    err := p.save()
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
    }
    http.Redirect(w, r, "/view/"+title, http.StatusFound)
}

func main(){
    http.HandleFunc("/view/", makeHandler(viewHandler))
    http.HandleFunc("/edit/", makeHandler(editHandler))
    http.HandleFunc("/save/", makeHandler(saveHandler))
    http.ListenAndServe(":8080", nil)
}

compile: go build wiki.go
run: ./wiki
browser: http://localhost:8080/view/test