Move mention macro into a goldmark-parser/renderer

parser/mention.go

@@ -0,0 +1,60 @@
+package parser
+
+import (
+	"bytes"
+
+	"github.com/yuin/goldmark/ast"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/text"
+)
+
+type Mention struct {
+	ast.BaseInline
+	Name []byte
+}
+
+func (m *Mention) Dump(source []byte, level int) {
+	ast.DumpHelper(m, source, level, map[string]string{
+		"Name": string(m.Name),
+	}, nil)
+}
+
+var KindMention = ast.NewNodeKind("Mention")
+
+func (m *Mention) Kind() ast.NodeKind {
+	return KindMention
+}
+
+func NewMention(name []byte) *Mention {
+	return &Mention{
+		Name: name,
+	}
+}
+
+type mentionParser struct {
+}
+
+func NewMentionParser() parser.InlineParser {
+	return &mentionParser{}
+}
+
+func (s *mentionParser) Trigger() []byte {
+	return []byte{'@'}
+}
+
+func (s *mentionParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {
+	line, _ := block.PeekLine()
+	if len(line) < 3 || line[1] != '{' {
+		return nil
+	}
+
+	index := bytes.IndexByte(line, '}')
+	if index == -1 || index <= 2 {
+		return nil
+	}
+
+	name := line[2:index]
+	block.Advance(index + 1)
+
+	return NewMention(name)
+}