Add support for markdown to HTML conversion (matrix). Closes #663 (#670)

This uses our own gomatrix lib with the SendHTML function which
adds HTML to formatted_body in matrix.
golang-commonmark is used to convert markdown into valid HTML.

1 files changed, 141 insertions, 0 deletions

diff --git a/vendor/gitlab.com/golang-commonmark/markdown/state_block.go b/vendor/gitlab.com/golang-commonmark/markdown/state_block.go
new file mode 100644
index 00000000..e1142416
--- /dev/null
+++ b/vendor/gitlab.com/golang-commonmark/markdown/state_block.go
@@ -0,0 +1,141 @@
+// Copyright 2015 The Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package markdown
+
+import "strings"
+
+const (
+	ptRoot = iota
+	ptList
+	ptBlockQuote
+	ptParagraph
+	ptReference
+)
+
+type StateBlock struct {
+	StateCore
+
+	BMarks     []int // offsets of the line beginnings
+	EMarks     []int // offsets of the line endings
+	TShift     []int // indents for each line
+	SCount     []int
+	BSCount    []int
+	BlkIndent  int  // required block content indent (in a list etc.)
+	Line       int  // line index in the source string
+	LineMax    int  // number of lines
+	Tight      bool // loose or tight mode for lists
+	ParentType byte // parent block type
+	Level      int
+}
+
+func (s *StateBlock) IsLineEmpty(n int) bool {
+	return s.BMarks[n]+s.TShift[n] >= s.EMarks[n]
+}
+
+func (s *StateBlock) SkipEmptyLines(from int) int {
+	for from < s.LineMax && s.IsLineEmpty(from) {
+		from++
+	}
+	return from
+}
+
+func (s *StateBlock) SkipSpaces(pos int) int {
+	src := s.Src
+	for pos < len(src) && byteIsSpace(src[pos]) {
+		pos++
+	}
+	return pos
+}
+
+func (s *StateBlock) SkipBytes(pos int, b byte) int {
+	src := s.Src
+	for pos < len(src) && src[pos] == b {
+		pos++
+	}
+	return pos
+}
+
+func (s *StateBlock) SkipBytesBack(pos int, b byte, min int) int {
+	for pos > min {
+		pos--
+		if s.Src[pos] != b {
+			return pos + 1
+		}
+	}
+	return pos
+}
+
+func (s *StateBlock) SkipSpacesBack(pos int, min int) int {
+	for pos > min {
+		pos--
+		if !byteIsSpace(s.Src[pos]) {
+			return pos + 1
+		}
+	}
+	return pos
+}
+
+func (s *StateBlock) Lines(begin, end, indent int, keepLastLf bool) string {
+	if begin == end {
+		return ""
+	}
+
+	src := s.Src
+
+	queue := make([]string, end-begin)
+
+	for i, line := 0, begin; line < end; i, line = i+1, line+1 {
+		lineIndent := 0
+		lineStart := s.BMarks[line]
+		first := lineStart
+		last := s.EMarks[line]
+		if (line+1 < end || keepLastLf) && last < len(src) {
+			last++
+		}
+
+		for first < last && lineIndent < indent {
+			ch := src[first]
+
+			if byteIsSpace(ch) {
+				if ch == '\t' {
+					lineIndent += 4 - (lineIndent+s.BSCount[line])%4
+				} else {
+					lineIndent++
+				}
+			} else if first-lineStart < s.TShift[line] {
+				lineIndent++
+			} else {
+				break
+			}
+
+			first++
+		}
+
+		if lineIndent > indent {
+			queue[i] = strings.Repeat(" ", lineIndent-indent) + src[first:last]
+		} else {
+			queue[i] = src[first:last]
+		}
+	}
+
+	return strings.Join(queue, "")
+}
+
+func (s *StateBlock) PushToken(tok Token) {
+	tok.SetLevel(s.Level)
+	s.Tokens = append(s.Tokens, tok)
+}
+
+func (s *StateBlock) PushOpeningToken(tok Token) {
+	tok.SetLevel(s.Level)
+	s.Level++
+	s.Tokens = append(s.Tokens, tok)
+}
+
+func (s *StateBlock) PushClosingToken(tok Token) {
+	s.Level--
+	tok.SetLevel(s.Level)
+	s.Tokens = append(s.Tokens, tok)
+}