Add Markdown HTML publication

internal/transform/markdown/markdown.go

@@ -0,0 +1,57 @@
+package markdown
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/yuin/goldmark"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"gitea.maximumdirect.net/eric/distributor/internal/transform"
+)
+
+type Transformer struct {
+	renderer goldmark.Markdown
+}
+
+func New() *Transformer {
+	return &Transformer{renderer: goldmark.New()}
+}
+
+func (t *Transformer) Generate(ctx context.Context, req transform.Request) ([]transform.Output, error) {
+	if t.renderer == nil {
+		t.renderer = goldmark.New()
+	}
+	var outputs []transform.Output
+	for _, file := range req.SourceBundle.Manifest.Files {
+		if !strings.HasSuffix(file.Path, ".md") {
+			continue
+		}
+		sourcePath, err := storage.Join(req.SourceBundle.RootRelativePath, file.Path)
+		if err != nil {
+			return nil, err
+		}
+		data, err := req.SourceBackend.ReadFile(ctx, sourcePath)
+		if err != nil {
+			return nil, fmt.Errorf("read markdown source %q: %w", file.Path, err)
+		}
+		var rendered bytes.Buffer
+		if err := t.renderer.Convert(data, &rendered); err != nil {
+			return nil, fmt.Errorf("render markdown source %q: %w", file.Path, err)
+		}
+		html := wrapHTML(rendered.Bytes())
+		outputPath := strings.TrimSuffix(file.Path, ".md") + ".html"
+		outputs = append(outputs, transform.Output{
+			Path:       outputPath,
+			SourcePath: file.Path,
+			Transform:  transform.MarkdownToHTML,
+			Data:       html,
+			SHA256:     bundle.FileDigest(html),
+			Size:       int64(len(html)),
+		})
+	}
+	return outputs, nil
+}