Add initial 'help' page

web/help.go

@@ -0,0 +1,38 @@
+package web
+
+import (
+	"fmt"
+	"html/template"
+	"net/http"
+
+	"git.fjla.uk/fred.boniface/barcodes/validation"
+)
+
+func buildPage(w http.ResponseWriter, r *http.Request) {
+	i := 0
+	barcodeOptions := make([]string, len(validation.FormatRules))
+	for k := range validation.FormatRules {
+		barcodeOptions[i] = k
+		i++
+	}
+
+	type dataType struct {
+		BarcodeOptions []string
+	}
+	data := dataType{
+		BarcodeOptions: barcodeOptions,
+	}
+
+	tmpl, err := template.New("help").ParseFiles("templates/help.html") // Match template name and file name
+	if err != nil {
+		fmt.Println("Error templating page: ", err)
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	err = tmpl.Execute(w, data)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}

web/server.go

@@ -10,6 +10,8 @@ func StartServer() {
 		fmt.Fprintf(w, "Barcodes")
 	})
 
+	http.HandleFunc("/help", buildPage)
+
 	http.HandleFunc("/generate", generateBarcode)
 
 	port := ":8500"