Created
October 5, 2020 05:34
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Convert markdown to pdf using goldmark and wkhtmltopdf.
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| package main | |
| import ( | |
| "bytes" | |
| "flag" | |
| "io/ioutil" | |
| "log" | |
| "path" | |
| "github.com/yuin/goldmark" | |
| "github.com/yuin/goldmark/extension" | |
| "github.com/yuin/goldmark/parser" | |
| "github.com/yuin/goldmark/renderer/html" | |
| pdf "github.com/SebastiaanKlippert/go-wkhtmltopdf" | |
| ) | |
| const DisableSandboxing = true | |
| // mdtohtml uses goldmark to render the source from markdown to html | |
| func mdtohtml(source []byte) []byte { | |
| md := goldmark.New( | |
| goldmark.WithExtensions( | |
| extension.GFM, | |
| // extension.NewLinkify(), | |
| extension.Footnote, | |
| extension.NewTable(), | |
| extension.DefinitionList, | |
| extension.NewTypographer(), | |
| ), | |
| goldmark.WithParserOptions( | |
| parser.WithAutoHeadingID(), | |
| ), | |
| goldmark.WithRendererOptions( | |
| html.WithHardWraps(), | |
| html.WithUnsafe(), | |
| ), | |
| ) | |
| var buf bytes.Buffer | |
| if err := md.Convert(source, &buf); err != nil { | |
| panic(err) | |
| } | |
| return buf.Bytes() | |
| } | |
| // htmltopdf uses go-wkhtmltopdf to render the source html as a pdf | |
| func htmltopdf(source []byte) []byte { | |
| // Create new PDF generator | |
| pdfg, err := pdf.NewPDFGenerator() | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| pdfg.Dpi.Set(600) | |
| pdfg.Orientation.Set(pdf.OrientationPortrait) | |
| pdfg.Grayscale.Set(false) | |
| pdfg.PageSize.Set(pdf.PageSizeLetter) | |
| page := pdf.NewPageReader(bytes.NewReader(source)) | |
| // page.FooterRight.Set("[page]") | |
| // page.FooterFontSize.Set(8) | |
| // page.Zoom.Set(0.95) | |
| if DisableSandboxing { | |
| page.Allow.Set(".") | |
| page.EnableLocalFileAccess.Set(true) | |
| } | |
| pdfg.AddPage(page) | |
| // Create PDF document in internal buffer | |
| if err = pdfg.Create(); err != nil { | |
| log.Fatal(err) | |
| } | |
| return pdfg.Buffer().Bytes() | |
| } | |
| var ( | |
| savehtml = flag.Bool("html", false, "preserve the html intermediate representation") | |
| ) | |
| func SetExt(filename, newext string) string { | |
| ext := path.Ext(filename) | |
| return filename[0:len(filename)-len(ext)] + newext | |
| } | |
| func main() { | |
| flag.Parse() | |
| files := flag.Args() | |
| for _, fn := range files { | |
| md, _ := ioutil.ReadFile(fn) | |
| html := mdtohtml(md) | |
| if *savehtml { | |
| ioutil.WriteFile(SetExt(fn, ".html"), html, 0644) | |
| } | |
| pdf := htmltopdf(html) | |
| ioutil.WriteFile(SetExt(fn, ".pdf"), pdf, 0644) | |
| } | |
| } |
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Requires wkhtmltopdf installed as a binary in $PATH.