Parsing data from YAML and outputting HTML

go-templates/.gitignore

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+/index.html
+/out

go-templates/build

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+go build -o out main.go

go-templates/data.yaml

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+Name: Oliver Davies

go-templates/go.mod

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+module go-templates
+
+go 1.24.4
+
+require gopkg.in/yaml.v3 v3.0.1 // indirect

go-templates/go.sum

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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

go-templates/main.go

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+package main
+
+import (
+	"log"
+	"os"
+	"text/template"
+
+	"gopkg.in/yaml.v3"
+)
+
+func check(err error) {
+	if err != nil {
+		log.Fatalf("error: %v", err)
+	}
+}
+
+func main() {
+	out, err := os.Create("index.html")
+	check(err)
+	defer out.Close()
+
+	data := map[string]any{}
+
+	buf, err := os.ReadFile("data.yaml")
+	check(err)
+	err = yaml.Unmarshal(buf, &data)
+	check(err)
+
+	t, err := template.ParseGlob("tmpl/*")
+	check(err)
+	err = t.Execute(out, data)
+	check(err)
+}

go-templates/tmpl/_.html

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+<h1>{{.Name}}</h1>