1 files changed, 82 insertions, 0 deletions
diff --git a/internal/build/parser.go b/internal/build/parser.go
new file mode 100644
index 0000000..e1ef3b0
--- /dev/null
+++ b/internal/build/parser.go
@@ -0,0 +1,82 @@
+package build
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/adrg/frontmatter"
+	"github.com/gomarkdown/markdown"
+	"github.com/gomarkdown/markdown/ast"
+	"github.com/gomarkdown/markdown/html"
+	"github.com/gomarkdown/markdown/parser"
+
+	"github.com/HimanshuSardana/kite/pkg/content"
+)
+
+type TOCItem struct {
+	Level int
+	Text  string
+	ID    string
+}
+
+type ParsedPage struct {
+	Frontmatter content.Frontmatter
+	Content     []byte
+	TOC         []TOCItem
+}
+
+func ParseMarkdown(path string) (*ParsedPage, error) {
+	md, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading %s: %w", path, err)
+	}
+
+	var matter content.Frontmatter
+	rest, err := frontmatter.Parse(strings.NewReader(string(md)), &matter)
+	if err != nil {
+		return nil, fmt.Errorf("parsing frontmatter: %w", err)
+	}
+
+	extensions := parser.CommonExtensions | parser.AutoHeadingIDs
+	p := parser.NewWithExtensions(extensions)
+	doc := p.Parse(rest)
+
+	var toc []TOCItem
+	ast.WalkFunc(doc, func(node ast.Node, entering bool) ast.WalkStatus {
+		if heading, ok := node.(*ast.Heading); ok && entering {
+			text := extractText(heading)
+			id := string(heading.HeadingID)
+
+			toc = append(toc, TOCItem{
+				Level: heading.Level,
+				Text:  text,
+				ID:    id,
+			})
+		}
+		return ast.GoToNext
+	})
+
+	renderer := html.NewRenderer(html.RendererOptions{
+		Flags: html.CommonFlags,
+	})
+
+	output := markdown.Render(doc, renderer)
+
+	return &ParsedPage{
+		Frontmatter: matter,
+		Content:     output,
+		TOC:         toc,
+	}, nil
+}
+
+func extractText(h *ast.Heading) string {
+	var text string
+	ast.WalkFunc(h, func(node ast.Node, entering bool) ast.WalkStatus {
+		if leaf, ok := node.(*ast.Text); ok && entering {
+			text += string(leaf.Literal)
+		}
+		return ast.GoToNext
+	})
+	return text
+}