Initial commit

edit.html

@@ -0,0 +1,6 @@
+<h1>Editing {{.Title}}</h1>
+
+<form action="/save/{{.Title}}" method="POST">
+  <div><textarea name="body" rows="20" cols="80">{{printf "%s" .Body}}</textarea></div>
+  <div><input type="submit" value="Save"></div>
+</form>

go.mod

@@ -0,0 +1,3 @@
+module wiki
+
+go 1.17

main.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+	"os"
+)
+
+type Page struct {
+	Title string
+	Body  []byte
+}
+
+func loadPage(title string) (*Page, error) {
+	body, err := os.ReadFile(title + ".txt")
+	if err != nil {
+		return nil, err
+	}
+	return &Page{Title: title, Body: body}, nil
+}
+
+func (p *Page) savePage() error {
+	filename := p.Title + ".txt"
+	return os.WriteFile(filename, p.Body, 0600)
+}
+
+func viewHandler(w http.ResponseWriter, r *http.Request) {
+	title := r.URL.Path[len("/view/"):]
+	page, err := loadPage(title)
+	if err != nil {
+		fmt.Fprintf(w, "<h1>ERROR</h1><p>%s not found!</p>", title)
+	} else {
+		fmt.Fprintf(w, "<h1>%s</h1><p>%s</p>", page.Title, string(page.Body))
+	}
+}
+
+func saveHandler(w http.ResponseWriter, r *http.Request) {
+	title := r.URL.Path[len("/save/"):]
+	p := &Page{Title: title, Body: []byte(r.FormValue("body"))}
+	p.savePage()
+	http.Redirect(w, r, "/view/"+title, http.StatusFound)
+
+}
+
+func editHandler(w http.ResponseWriter, r *http.Request) {
+	title := r.URL.Path[len("/edit/"):]
+	page, err := loadPage(title)
+	if err != nil {
+		page = &Page{Title: title}
+	}
+	t, _ := template.ParseFiles("edit.html")
+	t.Execute(w, page)
+}
+
+func main() {
+	http.HandleFunc("/view/", viewHandler)
+	http.HandleFunc("/save/", saveHandler)
+	http.HandleFunc("/edit/", editHandler)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}