Add go dependencies for mdtoc

vendor/github.com/mmarkdown/mmark/mparser/title.go

@@ -0,0 +1,57 @@
+package mparser
+
+import (
+	"log"
+
+	"github.com/BurntSushi/toml"
+	"github.com/gomarkdown/markdown/ast"
+	"github.com/mmarkdown/mmark/mast"
+)
+
+// TitleHook will parse a title and returns it. The start and ending can
+// be signalled with %%% or --- (the later to more inline with Hugo and other markdown dialects.
+func TitleHook(data []byte) (ast.Node, []byte, int) {
+	i := 0
+	if len(data) < 3 {
+		return nil, nil, 0
+	}
+
+	c := data[i] // first char can either be % or -
+	if c != '%' && c != '-' {
+		return nil, nil, 0
+	}
+
+	if data[i] != c || data[i+1] != c || data[i+2] != c {
+		return nil, nil, 0
+	}
+
+	i += 3
+	beg := i
+	found := false
+	// search for end.
+	for i < len(data) {
+		if data[i] == c && data[i+1] == c && data[i+2] == c {
+			found = true
+			break
+		}
+		i++
+	}
+	if !found {
+		return nil, nil, 0
+	}
+
+	node := mast.NewTitle(c)
+	buf := data[beg:i]
+
+	if c == '-' {
+		node.Content = buf
+		return node, nil, i + 3
+	}
+
+	if _, err := toml.Decode(string(buf), node.TitleData); err != nil {
+		log.Printf("Failure parsing title block: %s", err)
+	}
+	node.Content = buf
+
+	return node, nil, i + 3
+}