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92 lines
2.1 KiB
92 lines
2.1 KiB
package main
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// example for https://blog.kowalczyk.info/article/cxn3/advanced-markdown-processing-in-go.html
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import (
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"fmt"
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"io"
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"github.com/gomarkdown/markdown"
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"github.com/gomarkdown/markdown/ast"
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mdhtml "github.com/gomarkdown/markdown/html"
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"github.com/alecthomas/chroma"
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"github.com/alecthomas/chroma/formatters/html"
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"github.com/alecthomas/chroma/lexers"
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"github.com/alecthomas/chroma/styles"
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)
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var (
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htmlFormatter *html.Formatter
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highlightStyle *chroma.Style
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)
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func init() {
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htmlFormatter = html.New(html.WithClasses(true), html.TabWidth(2))
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if htmlFormatter == nil {
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panic("couldn't create html formatter")
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}
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styleName := "monokailight"
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highlightStyle = styles.Get(styleName)
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if highlightStyle == nil {
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panic(fmt.Sprintf("didn't find style '%s'", styleName))
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}
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}
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// based on https://github.com/alecthomas/chroma/blob/master/quick/quick.go
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func htmlHighlight(w io.Writer, source, lang, defaultLang string) error {
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if lang == "" {
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lang = defaultLang
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}
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l := lexers.Get(lang)
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if l == nil {
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l = lexers.Analyse(source)
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}
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if l == nil {
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l = lexers.Fallback
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}
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l = chroma.Coalesce(l)
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it, err := l.Tokenise(nil, source)
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if err != nil {
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return err
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}
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return htmlFormatter.Format(w, highlightStyle, it)
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}
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// an actual rendering of Paragraph is more complicated
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func renderCode(w io.Writer, codeBlock *ast.CodeBlock, entering bool) {
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defaultLang := ""
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lang := string(codeBlock.Info)
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htmlHighlight(w, string(codeBlock.Literal), lang, defaultLang)
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}
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func myRenderHook(w io.Writer, node ast.Node, entering bool) (ast.WalkStatus, bool) {
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if code, ok := node.(*ast.CodeBlock); ok {
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renderCode(w, code, entering)
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return ast.GoToNext, true
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}
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return ast.GoToNext, false
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}
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func newCustomizedRender() *mdhtml.Renderer {
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opts := mdhtml.RendererOptions{
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Flags: mdhtml.CommonFlags,
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RenderNodeHook: myRenderHook,
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}
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return mdhtml.NewRenderer(opts)
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}
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var mds = "code block:\n```go\nvar n = 384\n```"
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func codeHighlight() {
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md := []byte(mds)
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renderer := newCustomizedRender()
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html := markdown.ToHTML(md, nil, renderer)
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fmt.Printf("--- Markdown:\n%s\n\n--- HTML:\n%s\n", md, html)
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}
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func main() {
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codeHighlight()
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}
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