providers/markdown: Create a default markdown provider

providers/markdown/markdown.go

@@ -6,20 +6,39 @@ import "strings"
 import "html/template"
 import "github.com/yuin/goldmark"
 import "github.com/yuin/goldmark/parser"
+import "github.com/yuin/goldmark/renderer"
+import "github.com/yuin/goldmark/extension"
 import "git.tebibyte.media/sashakoshka/step"
+import "github.com/yuin/goldmark/renderer/html"
 
 var _ step.FuncProvider = new(Provider)
 
 // Provider provides Markdown functions.
 type Provider struct {
-	// Options contains parse options that are passed to the converter.
-	Options []parser.ParseOption
+	Extensions      []goldmark.Extender
+	ParserOptions   []parser.Option
+	RendererOptions []renderer.Option
+}
+
+// Default returns a provider with the default configuration.
+func Default () *Provider {
+	return &Provider {
+		Extensions: []goldmark.Extender { extension.GFM },
+		ParserOptions: []parser.Option { parser.WithAutoHeadingID() },
+		RendererOptions: []renderer.Option {
+			html.WithXHTML(),
+			html.WithUnsafe(),
+		},
+	}
 }
 
 // FuncMap fulfills the step.FuncProvider interface.
 func (this *Provider) FuncMap () template.FuncMap {
 	stat := &state {
-		options: this.Options,
+		md: goldmark.New (
+			goldmark.WithExtensions(this.Extensions...),
+			goldmark.WithParserOptions(this.ParserOptions...),
+			goldmark.WithRendererOptions(this.RendererOptions...)),
 	}
 	return template.FuncMap {
 		"markdown": stat.funcMarkdown,
@@ -27,12 +46,12 @@ func (this *Provider) FuncMap () template.FuncMap {
 }
 
 type state struct {
-	options []parser.ParseOption
+	md goldmark.Markdown
 }
 
 func (this *state) funcMarkdown (input any) (template.HTML, error) {
 	builder := strings.Builder { }
-	err := goldmark.Convert(toBytes(input), &builder, this.options...)
+	err := this.md.Convert(toBytes(input), &builder)
 	if err != nil { return "", nil }
 	return template.HTML(builder.String()), nil
 }