chore: initial gomark plugin (#1678)

chore: initial gomark folder

plugin/gomark/parser/heading.go

@@ -0,0 +1,41 @@
+package parser
+
+import (
+	"strings"
+
+	"github.com/usememos/memos/plugin/gomark/ast"
+)
+
+type HeadingTokenizer struct {
+}
+
+func NewHeadingTokenizer() *HeadingTokenizer {
+	return &HeadingTokenizer{}
+}
+
+func (*HeadingTokenizer) Trigger() []byte {
+	return []byte{'#'}
+}
+
+func (*HeadingTokenizer) Parse(parent *ast.Node, block string) *ast.Node {
+	line := block
+	level := 0
+	for _, c := range line {
+		if c == '#' {
+			level++
+		} else if c == ' ' {
+			break
+		} else {
+			return nil
+		}
+	}
+	if level == 0 || level > 6 {
+		return nil
+	}
+	text := strings.TrimSpace(line[level+1:])
+	node := ast.NewNode("h1", text)
+	if parent != nil {
+		parent.AddChild(node)
+	}
+	return node
+}