Preview command for serving preview of order confirmation template

Makefile

@@ -20,6 +20,11 @@ server:
 	export GO111MODULE="on"; \
 	go run -race cmd/server/main.go
 
+## preview: runs preview of mail template
+preview:
+	export GO111MODULE="on"; \
+        go run cmd/preview/main.go
+
 ## modd: Monitors the directory, and recompiles your app every time a file changes. Also runs tests.
 ## (To install modd, run: go get github.com/cortesi/modd/cmd/modd)
 modd:

README.md

@@ -26,4 +26,10 @@ Run as docker container using:
 or
 ```bash
 (sudo) docker run -d --name planetposen-mail -p 8000:8000 --env-file .env planetposen-mail
+```
+
+## Preview
+Use view template as preview during local development run:
+```bash
+make preview
 ```

cmd/preview/main.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+)
+
+type Product struct {
+	Name        string
+	Image       string
+	Description string
+	Quantity    int
+	Price       float32
+	Currency    string
+}
+
+type ReceiptPageData struct {
+	PageTitle string
+	OrderId   string
+	Products  []Product
+}
+
+func serveTemplate(response http.ResponseWriter, request *http.Request) {
+	tmpl := template.Must(template.ParseFiles("mail/mail-template_order-confirmation.html"))
+	// tmpl := template.Must(w)
+	data := ReceiptPageData{
+		PageTitle: "Planetposen purchase",
+		OrderId:   "fb9a5910-0dcf-4c65-9c25-3fb3eb883ce5",
+		Products: []Product{
+			{Name: "Forrest", Image: "https://planet.schleppe.cloud/email/items/item-1.jpg", Description: "Sneaker Maker", Quantity: 4, Price: 49.99, Currency: "NOK"},
+			{Name: "Cookie-Man Forrest", Image: "https://planet.schleppe.cloud/email/items/item-2.jpg", Description: "Boots Brothers", Quantity: 3, Price: 99, Currency: "NOK"},
+			{Name: "Floral", Image: "https://planet.schleppe.cloud/email/items/item-3.jpg", Description: "Swiss Made", Quantity: 1, Price: 129, Currency: "NOK"},
+		},
+	}
+
+	var b bytes.Buffer
+	template := bufio.NewWriter(&b)
+	err := tmpl.Execute(template, data)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	response.Header().Set("Content-Type", "text/html")
+	response.WriteHeader(http.StatusOK)
+	response.Write([]byte(b.String()))
+}
+
+func main() {
+	ADDRESS := ":5006"
+	fmt.Printf("Serving preview of template at %s\n", ADDRESS)
+	http.HandleFunc("/", serveTemplate)
+	log.Fatal(http.ListenAndServe(ADDRESS, nil))
+}

go.mod

@@ -10,4 +10,4 @@ require (
 	github.com/sirupsen/logrus v1.9.0
 )
 
-require golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
+require golang.org/x/sys v0.2.0 // indirect

go.sum

@@ -17,8 +17,9 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 h1:0A+M6Uqn+Eje4kHMK80dtF3JCXC4ykBgQG4Fe06QRhQ=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
+golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=