Upgrade to Go 1.18

.github/workflows/go.yml

@@ -19,10 +19,10 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.17
+      - name: Set up Go 1.18
         uses: actions/setup-go@v3
         with:
-          go-version: '^1.17'
+          go-version: '^1.18'
         id: go
 
       - name: Login to GitHub Container Registry

api/views.go

@@ -25,7 +25,7 @@ func init() {
 	if t, err := template.
 		New("index").
 		Funcs(sprig.FuncMap()).
-		Funcs(map[string]interface{}{
+		Funcs(map[string]any{
 			"fileId": func(fileName string) string {
 				h := fnv.New32a()
 				return hex.EncodeToString(h.Sum([]byte(path.Base(fileName))))
@@ -60,7 +60,7 @@ func RegisterViews(router *httprouter.Router, logger *log.Logger, wdfs fs.FS, md
 
 func (p *Views) IndexPage(writer http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
 	writer.Header().Set("Content-Type", "text/html")
-	if err := indexTmpl.ExecuteTemplate(writer, "index.gohtml", map[string]interface{}{
+	if err := indexTmpl.ExecuteTemplate(writer, "index.gohtml", map[string]any{
 		"Reveal":    p.cfg.Reveal,
 		"Rendering": p.cfg.Rendering,
 	}); err != nil {

config/components.go

@@ -5,7 +5,7 @@ const (
 	defaultHeight uint = 700
 )
 
-var defaults = map[string]interface{}{
+var defaults = map[string]any{
 	"mermaid.theme":                       "forest",
 	"theme":                               "beige",
 	"width":                               defaultWidth,

go.mod

@@ -1,6 +1,6 @@
 module github.com/baez90/goveal
 
-go 1.17
+go 1.18
 
 require (
 	github.com/Masterminds/sprig/v3 v3.2.2
@@ -12,6 +12,7 @@ require (
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/cobra v1.4.0
 	github.com/spf13/viper v1.10.1
+	github.com/valyala/bytebufferpool v1.0.0
 	go.uber.org/multierr v1.8.0
 )
 

go.sum

@@ -201,6 +201,8 @@ github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5Cc
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
+github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
+github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=

rendering/html.go

@@ -1,12 +1,12 @@
 package rendering
 
 import (
-	"bytes"
 	"fmt"
 	"html/template"
 	"regexp"
 
 	"github.com/gomarkdown/markdown/parser"
+	"github.com/valyala/bytebufferpool"
 
 	"github.com/baez90/goveal/config"
 )
@@ -24,17 +24,17 @@ func ToHTML(markdown string, renderCfg config.Rendering) (rendered []byte, err e
 		return nil, err
 	}
 
-	buf := templateRenderBufferPool.Get().(*bytes.Buffer)
+	buf := bytebufferpool.Get()
 	defer func() {
 		buf.Reset()
-		templateRenderBufferPool.Put(buf)
+		bytebufferpool.Put(buf)
 	}()
 
 	for idx := range slides {
 		if rendered, err := slides[idx].ToHTML(); err != nil {
 			return nil, err
 		} else {
-			buf.WriteString(string(rendered))
+			_, _ = buf.WriteString(string(rendered))
 		}
 	}
 

rendering/render_to_reveal.go

@@ -78,7 +78,7 @@ func (r *RevealRenderer) handleListItem(w io.Writer, listItem *ast.ListItem) (as
 				return ast.GoToNext, false
 			}
 
-			data := map[string]interface{}{
+			data := map[string]any{
 				"Attributes": getAttributesFromChildSpan(p),
 			}
 
@@ -102,7 +102,7 @@ func (r *RevealRenderer) handleImage(w io.Writer, img *ast.Image) (ast.WalkStatu
 		}
 	}
 
-	data := map[string]interface{}{
+	data := map[string]any{
 		"ID":              hex.EncodeToString(r.Hash.Sum([]byte(path.Base(string(img.Destination))))),
 		"Attributes":      getAttributesFromChildSpan(img.GetParent()),
 		"ImageSource":     string(img.Destination),
@@ -154,7 +154,7 @@ func extractElementAttributes(htmlSpan *ast.HTMLSpan) (attrs []template.HTMLAttr
 }
 
 func renderCodeTemplate(templateName string, codeBlock *ast.CodeBlock) (output []byte, err error) {
-	data := map[string]interface{}{
+	data := map[string]any{
 		//nolint:gosec // need to embed the code in original format without escaping
 		"Code":        template.HTML(codeBlock.Literal),
 		"LineNumbers": lineNumbers(codeBlock.Attribute),

rendering/templates.go

@@ -1,16 +1,15 @@
 package rendering
 
 import (
-	"bytes"
 	"embed"
 	"hash/fnv"
 	"html/template"
-	"sync"
 
 	"github.com/Masterminds/sprig/v3"
 	"github.com/gomarkdown/markdown"
 	mdhtml "github.com/gomarkdown/markdown/html"
 	"github.com/gomarkdown/markdown/parser"
+	"github.com/valyala/bytebufferpool"
 
 	"github.com/baez90/goveal/rendering/emoji"
 )
@@ -19,11 +18,6 @@ var (
 	//go:embed templates/*.gohtml
 	templatesFS embed.FS
 	templates   *template.Template
-	templateRenderBufferPool = &sync.Pool{
-		New: func() interface{} {
-			return new(bytes.Buffer)
-		},
-	}
 )
 
 func init() {
@@ -54,11 +48,11 @@ func init() {
 	}
 }
 
-func renderTemplate(templateName string, data interface{}) (output []byte, err error) {
+func renderTemplate(templateName string, data any) (output []byte, err error) {
-	buffer := templateRenderBufferPool.Get().(*bytes.Buffer)
+	buffer := bytebufferpool.Get()
 	defer func() {
 		buffer.Reset()
-		templateRenderBufferPool.Put(buffer)
+		bytebufferpool.Put(buffer)
 	}()
 
 	err = templates.ExecuteTemplate(buffer, templateName, data)