feat/user-templates (#9)

feat: user templates

pkg/invoice/report/template.go

@@ -9,15 +9,16 @@ import (
 	"time"
 )
 
-//go:embed assets/template.html
-var htmlTemplate string
-
 //go:embed assets/style.css
 var style template.CSS
 
+//go:embed assets/tailwind.js
+var tailwind template.JS
+
 type tmpler struct {
 	Report
-	Style template.CSS
+	Tailwind template.JS
+	Style    template.CSS
 }
 
 func (r Report) ToHTML() (html string, err error) {
@@ -29,11 +30,11 @@ func (r Report) ToHTML() (html string, err error) {
 			"time":     fmtDateTime,
 			"date":     fmtDate,
 			"duration": fmtDuration,
-		}).Parse(htmlTemplate))
+		}).Parse(r.template))
 
 	buf := new(bytes.Buffer)
 
-	err = tmpl.Execute(buf, tmpler{r, style})
+	err = tmpl.Execute(buf, tmpler{r, tailwind, style})
 	if err != nil {
 		return html, err
 	}