Add go dependencies for mdtoc

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

@@ -0,0 +1,59 @@
+package mparser
+
+import (
+	"io/ioutil"
+	"log"
+	"path/filepath"
+
+	"github.com/gomarkdown/markdown/ast"
+	"github.com/gomarkdown/markdown/parser"
+)
+
+var UnsafeInclude parser.Flags = 1 << 3
+
+// Hook will call both TitleHook and ReferenceHook.
+func Hook(data []byte) (ast.Node, []byte, int) {
+	n, b, i := TitleHook(data)
+	if n != nil {
+		return n, b, i
+	}
+
+	return ReferenceHook(data)
+}
+
+// ReadInclude is the hook to read includes.
+// Its supports the following options for address.
+//
+// 4,5 - line numbers separated by commas
+// N, - line numbers, end not specified, read until the end.
+// /start/,/end/ - regexp separated by commas
+// optional a prefix="" string.
+func (i Initial) ReadInclude(from, file string, address []byte) []byte {
+	path := i.path(from, file)
+
+	if i.Flags&UnsafeInclude == 0 {
+		if ok := i.pathAllowed(path); !ok {
+			log.Printf("Failure to read: %q: path is not on or below %q", path, i.i)
+			return nil
+		}
+	}
+
+	data, err := ioutil.ReadFile(path)
+	if err != nil {
+		log.Printf("Failure to read: %q (from %q)", err, filepath.Join(from, "*"))
+		return nil
+	}
+
+	data, err = parseAddress(address, data)
+	if err != nil {
+		log.Printf("Failure to parse address for %q: %q (from %q)", path, err, filepath.Join(from, "*"))
+		return nil
+	}
+	if len(data) == 0 {
+		return data
+	}
+	if data[len(data)-1] != '\n' {
+		data = append(data, '\n')
+	}
+	return data
+}