Build-time minification, image optimization, htmx SPA navigation, and local htmx bundle

main.go

@@ -3,6 +3,7 @@ package main
 //go:generate go tool templ generate templates
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"io"
@@ -15,20 +16,57 @@ import (
 	"piekarnikgosi/utils"
 	"sort"
 	"strings"
+	"sync"
+
+	"github.com/tdewolff/minify/v2"
+	mcss "github.com/tdewolff/minify/v2/css"
+	mhtml "github.com/tdewolff/minify/v2/html"
+	mjs "github.com/tdewolff/minify/v2/js"
 )
 
 type ComponentRenderer interface {
 	Render(ctx context.Context, w io.Writer) error
 }
 
-func saveFile(name string, comp ComponentRenderer) {
-	file, err := os.Create("www/" + name + ".html")
+var minifier = sync.OnceValue(func() *minify.M {
+	m := minify.New()
+	m.Add("text/html", &mhtml.Minifier{
+		KeepDocumentTags: true,
+		KeepEndTags:      true,
+	})
+	m.Add("text/css", &mcss.Minifier{})
+	m.Add("application/javascript", &mjs.Minifier{})
+	return m
+})
+
+func minifyFile(path, mediatype string) {
+	data, err := os.ReadFile(path)
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer file.Close()
+	err = os.WriteFile(path, minifyData(mediatype, data), 0666)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
 
-	err = comp.Render(context.Background(), file)
+func minifyData(mediatype string, data []byte) []byte {
+	b, err := minifier().Bytes(mediatype, data)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return b
+}
+
+func saveFile(name string, comp ComponentRenderer) {
+	var buf bytes.Buffer
+	err := comp.Render(context.Background(), &buf)
+	if err != nil {
+		log.Fatal(err)
+	}
+	minified := minifyData("text/html", buf.Bytes())
+
+	err = os.WriteFile("www/"+name+".html", minified, 0666)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -117,7 +155,8 @@ func mergeStyles() {
 		bundledCSS = append(bundledCSS, '\n')
 	}
 
-	err := os.WriteFile("www/style.css", bundledCSS, 0666)
+	minified := minifyData("text/css", bundledCSS)
+	err := os.WriteFile("www/style.css", minified, 0666)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -125,9 +164,12 @@ func mergeStyles() {
 
 func ensureDir() {
 	log.Println("creating directories")
-	err := os.MkdirAll("www/images", 0777)
-	if err != nil {
-		log.Fatal(err)
+	os.MkdirAll("www/images", 0777)
+	entries, _ := os.ReadDir("www")
+	for _, e := range entries {
+		if !e.IsDir() && filepath.Ext(e.Name()) == ".html" {
+			os.Remove("www/" + e.Name())
+		}
 	}
 }
 
@@ -145,6 +187,8 @@ func main() {
 	mustCopy("img/favicon.avif", "www/images/favicon.avif")
 	mustCopy("img/logo.svg", "www/images/logo.svg")
 	mustCopy("js/portfolio.js", "www/portfolio.js")
+	minifyFile("www/portfolio.js", "application/javascript")
+	mustCopy("js/htmx.min.js", "www/htmx.min.js")
 	if len(os.Args) > 1 {
 		return
 	}