Line wrap long strings in code blocks.

Author: jessp01

cmd/md2pdf/md2pdf.go

@@ -177,7 +177,6 @@ func main() {
 	pf := mdtopdf.NewPdfRenderer(params)
 
 	if *generateTOC == true {
-		// we need to generate the TOC for `content`
 		headers, err := mdtopdf.GetTOCEntries(content)
 		if err != nil {
 			log.Fatal(err)

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/gabriel-vasile/mimetype v1.4.8
 	github.com/gomarkdown/markdown v0.0.0-20250311123330-531bef5e742b
 	github.com/jessp01/gohighlight v0.21.2
+	github.com/mitchellh/go-wordwrap v1.0.1
 	golang.org/x/exp v0.0.0-20240707233637-46b078467d37
 )
 

go.sum

@@ -13,6 +13,8 @@ github.com/jessp01/gohighlight v0.21.2 h1:radLDWQMJeDwzn6b8cduio7kVXhy3zkYFsWxkr
 github.com/jessp01/gohighlight v0.21.2/go.mod h1:52r0Yxd1+T9f7uLenaO2/34K3gPOejxCxXwdNc/2Z8Y=
 github.com/mcuadros/go-version v0.0.0-20190830083331-035f6764e8d2 h1:YocNLcTBdEdvY3iDK6jfWXvEaM5OCKkjxPKoJRdB3Gg=
 github.com/mcuadros/go-version v0.0.0-20190830083331-035f6764e8d2/go.mod h1:76rfSfYPWj01Z85hUf/ituArm797mNKcvINh1OlsZKo=
+github.com/mitchellh/go-wordwrap v1.0.1 h1:TLuKupo69TCn6TQSyGxwI1EblZZEsQ0vMlAFQflz0v0=
+github.com/mitchellh/go-wordwrap v1.0.1/go.mod h1:R62XHJLzvMFRBbcrT7m7WgmE1eOyTSsCt+hzestvNj0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=

nodeProcessing.go

@@ -38,6 +38,7 @@ import (
 	"github.com/gabriel-vasile/mimetype"
 	"github.com/gomarkdown/markdown/ast"
 	highlight "github.com/jessp01/gohighlight"
+	"github.com/mitchellh/go-wordwrap"
 )
 
 func (r *PdfRenderer) processText(node *ast.Text) {
@@ -119,9 +120,10 @@ func (r *PdfRenderer) processCodeblock(node ast.CodeBlock) {
 	}
 	syntaxDef, _ := highlight.ParseDef(syntaxFile)
 	h := highlight.NewHighlighter(syntaxDef)
-	matches := h.HighlightString(string(node.Literal))
+	linesWrapped := wordwrap.WrapString(string(node.Literal), 90)
+	matches := h.HighlightString(linesWrapped)
 	r.cr()
-	lines := strings.Split(string(node.Literal), "\n")
+	lines := strings.Split(linesWrapped, "\n")
 	for lineN, l := range lines {
 		colN := 0
 		for _, c := range l {