Add initial Microsoft Teams support

Documentation on https://github.com/42wim/matterbridge/wiki/MS-Teams-setup

15 files changed, 1319 insertions, 0 deletions

diff --git a/vendor/github.com/mattn/go-runewidth/.travis.yml b/vendor/github.com/mattn/go-runewidth/.travis.yml
new file mode 100644
index 00000000..5c9c2a30
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/.travis.yml
@@ -0,0 +1,8 @@
+language: go
+go:
+  - tip
+before_install:
+  - go get github.com/mattn/goveralls
+  - go get golang.org/x/tools/cmd/cover
+script:
+    - $HOME/gopath/bin/goveralls -repotoken lAKAWPzcGsD3A8yBX3BGGtRUdJ6CaGERL
diff --git a/vendor/github.com/mattn/go-runewidth/LICENSE b/vendor/github.com/mattn/go-runewidth/LICENSE
new file mode 100644
index 00000000..91b5cef3
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 Yasuhiro Matsumoto
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/mattn/go-runewidth/README.mkd b/vendor/github.com/mattn/go-runewidth/README.mkd
new file mode 100644
index 00000000..66663a94
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/README.mkd
@@ -0,0 +1,27 @@
+go-runewidth
+============
+
+[![Build Status](https://travis-ci.org/mattn/go-runewidth.png?branch=master)](https://travis-ci.org/mattn/go-runewidth)
+[![Coverage Status](https://coveralls.io/repos/mattn/go-runewidth/badge.png?branch=HEAD)](https://coveralls.io/r/mattn/go-runewidth?branch=HEAD)
+[![GoDoc](https://godoc.org/github.com/mattn/go-runewidth?status.svg)](http://godoc.org/github.com/mattn/go-runewidth)
+[![Go Report Card](https://goreportcard.com/badge/github.com/mattn/go-runewidth)](https://goreportcard.com/report/github.com/mattn/go-runewidth)
+
+Provides functions to get fixed width of the character or string.
+
+Usage
+-----
+
+```go
+runewidth.StringWidth("つのだ☆HIRO") == 12
+```
+
+
+Author
+------
+
+Yasuhiro Matsumoto
+
+License
+-------
+
+under the MIT License: http://mattn.mit-license.org/2013
diff --git a/vendor/github.com/mattn/go-runewidth/go.mod b/vendor/github.com/mattn/go-runewidth/go.mod
new file mode 100644
index 00000000..fa7f4d86
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/go.mod
@@ -0,0 +1,3 @@
+module github.com/mattn/go-runewidth
+
+go 1.9
diff --git a/vendor/github.com/mattn/go-runewidth/runewidth.go b/vendor/github.com/mattn/go-runewidth/runewidth.go
new file mode 100644
index 00000000..8d64da07
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/runewidth.go
@@ -0,0 +1,258 @@
+package runewidth
+
+import (
+	"os"
+)
+
+//go:generate go run script/generate.go
+
+var (
+	// EastAsianWidth will be set true if the current locale is CJK
+	EastAsianWidth bool
+
+	// ZeroWidthJoiner is flag to set to use UTR#51 ZWJ
+	ZeroWidthJoiner bool
+
+	// DefaultCondition is a condition in current locale
+	DefaultCondition = &Condition{}
+)
+
+func init() {
+	handleEnv()
+}
+
+func handleEnv() {
+	env := os.Getenv("RUNEWIDTH_EASTASIAN")
+	if env == "" {
+		EastAsianWidth = IsEastAsian()
+	} else {
+		EastAsianWidth = env == "1"
+	}
+	// update DefaultCondition
+	DefaultCondition.EastAsianWidth = EastAsianWidth
+	DefaultCondition.ZeroWidthJoiner = ZeroWidthJoiner
+}
+
+type interval struct {
+	first rune
+	last  rune
+}
+
+type table []interval
+
+func inTables(r rune, ts ...table) bool {
+	for _, t := range ts {
+		if inTable(r, t) {
+			return true
+		}
+	}
+	return false
+}
+
+func inTable(r rune, t table) bool {
+	// func (t table) IncludesRune(r rune) bool {
+	if r < t[0].first {
+		return false
+	}
+
+	bot := 0
+	top := len(t) - 1
+	for top >= bot {
+		mid := (bot + top) >> 1
+
+		switch {
+		case t[mid].last < r:
+			bot = mid + 1
+		case t[mid].first > r:
+			top = mid - 1
+		default:
+			return true
+		}
+	}
+
+	return false
+}
+
+var private = table{
+	{0x00E000, 0x00F8FF}, {0x0F0000, 0x0FFFFD}, {0x100000, 0x10FFFD},
+}
+
+var nonprint = table{
+	{0x0000, 0x001F}, {0x007F, 0x009F}, {0x00AD, 0x00AD},
+	{0x070F, 0x070F}, {0x180B, 0x180E}, {0x200B, 0x200F},
+	{0x2028, 0x202E}, {0x206A, 0x206F}, {0xD800, 0xDFFF},
+	{0xFEFF, 0xFEFF}, {0xFFF9, 0xFFFB}, {0xFFFE, 0xFFFF},
+}
+
+// Condition have flag EastAsianWidth whether the current locale is CJK or not.
+type Condition struct {
+	EastAsianWidth  bool
+	ZeroWidthJoiner bool
+}
+
+// NewCondition return new instance of Condition which is current locale.
+func NewCondition() *Condition {
+	return &Condition{
+		EastAsianWidth:  EastAsianWidth,
+		ZeroWidthJoiner: ZeroWidthJoiner,
+	}
+}
+
+// RuneWidth returns the number of cells in r.
+// See http://www.unicode.org/reports/tr11/
+func (c *Condition) RuneWidth(r rune) int {
+	switch {
+	case r < 0 || r > 0x10FFFF || inTables(r, nonprint, combining, notassigned):
+		return 0
+	case (c.EastAsianWidth && IsAmbiguousWidth(r)) || inTables(r, doublewidth):
+		return 2
+	default:
+		return 1
+	}
+}
+
+func (c *Condition) stringWidth(s string) (width int) {
+	for _, r := range []rune(s) {
+		width += c.RuneWidth(r)
+	}
+	return width
+}
+
+func (c *Condition) stringWidthZeroJoiner(s string) (width int) {
+	r1, r2 := rune(0), rune(0)
+	for _, r := range []rune(s) {
+		if r == 0xFE0E || r == 0xFE0F {
+			continue
+		}
+		w := c.RuneWidth(r)
+		if r2 == 0x200D && inTables(r, emoji) && inTables(r1, emoji) {
+			if width < w {
+				width = w
+			}
+		} else {
+			width += w
+		}
+		r1, r2 = r2, r
+	}
+	return width
+}
+
+// StringWidth return width as you can see
+func (c *Condition) StringWidth(s string) (width int) {
+	if c.ZeroWidthJoiner {
+		return c.stringWidthZeroJoiner(s)
+	}
+	return c.stringWidth(s)
+}
+
+// Truncate return string truncated with w cells
+func (c *Condition) Truncate(s string, w int, tail string) string {
+	if c.StringWidth(s) <= w {
+		return s
+	}
+	r := []rune(s)
+	tw := c.StringWidth(tail)
+	w -= tw
+	width := 0
+	i := 0
+	for ; i < len(r); i++ {
+		cw := c.RuneWidth(r[i])
+		if width+cw > w {
+			break
+		}
+		width += cw
+	}
+	return string(r[0:i]) + tail
+}
+
+// Wrap return string wrapped with w cells
+func (c *Condition) Wrap(s string, w int) string {
+	width := 0
+	out := ""
+	for _, r := range []rune(s) {
+		cw := RuneWidth(r)
+		if r == '\n' {
+			out += string(r)
+			width = 0
+			continue
+		} else if width+cw > w {
+			out += "\n"
+			width = 0
+			out += string(r)
+			width += cw
+			continue
+		}
+		out += string(r)
+		width += cw
+	}
+	return out
+}
+
+// FillLeft return string filled in left by spaces in w cells
+func (c *Condition) FillLeft(s string, w int) string {
+	width := c.StringWidth(s)
+	count := w - width
+	if count > 0 {
+		b := make([]byte, count)
+		for i := range b {
+			b[i] = ' '
+		}
+		return string(b) + s
+	}
+	return s
+}
+
+// FillRight return string filled in left by spaces in w cells
+func (c *Condition) FillRight(s string, w int) string {
+	width := c.StringWidth(s)
+	count := w - width
+	if count > 0 {
+		b := make([]byte, count)
+		for i := range b {
+			b[i] = ' '
+		}
+		return s + string(b)
+	}
+	return s
+}
+
+// RuneWidth returns the number of cells in r.
+// See http://www.unicode.org/reports/tr11/
+func RuneWidth(r rune) int {
+	return DefaultCondition.RuneWidth(r)
+}
+
+// IsAmbiguousWidth returns whether is ambiguous width or not.
+func IsAmbiguousWidth(r rune) bool {
+	return inTables(r, private, ambiguous)
+}
+
+// IsNeutralWidth returns whether is neutral width or not.
+func IsNeutralWidth(r rune) bool {
+	return inTable(r, neutral)
+}
+
+// StringWidth return width as you can see
+func StringWidth(s string) (width int) {
+	return DefaultCondition.StringWidth(s)
+}
+
+// Truncate return string truncated with w cells
+func Truncate(s string, w int, tail string) string {
+	return DefaultCondition.Truncate(s, w, tail)
+}
+
+// Wrap return string wrapped with w cells
+func Wrap(s string, w int) string {
+	return DefaultCondition.Wrap(s, w)
+}
+
+// FillLeft return string filled in left by spaces in w cells
+func FillLeft(s string, w int) string {
+	return DefaultCondition.FillLeft(s, w)
+}
+
+// FillRight return string filled in left by spaces in w cells
+func FillRight(s string, w int) string {
+	return DefaultCondition.FillRight(s, w)
+}
diff --git a/vendor/github.com/mattn/go-runewidth/runewidth_appengine.go b/vendor/github.com/mattn/go-runewidth/runewidth_appengine.go
new file mode 100644
index 00000000..7d99f6e5
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/runewidth_appengine.go
@@ -0,0 +1,8 @@
+// +build appengine
+
+package runewidth
+
+// IsEastAsian return true if the current locale is CJK
+func IsEastAsian() bool {
+	return false
+}
diff --git a/vendor/github.com/mattn/go-runewidth/runewidth_js.go b/vendor/github.com/mattn/go-runewidth/runewidth_js.go
new file mode 100644
index 00000000..c5fdf40b
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/runewidth_js.go
@@ -0,0 +1,9 @@
+// +build js
+// +build !appengine
+
+package runewidth
+
+func IsEastAsian() bool {
+	// TODO: Implement this for the web. Detect east asian in a compatible way, and return true.
+	return false
+}
diff --git a/vendor/github.com/mattn/go-runewidth/runewidth_posix.go b/vendor/github.com/mattn/go-runewidth/runewidth_posix.go
new file mode 100644
index 00000000..66a58b5d
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/runewidth_posix.go
@@ -0,0 +1,79 @@
+// +build !windows
+// +build !js
+// +build !appengine
+
+package runewidth
+
+import (
+	"os"
+	"regexp"
+	"strings"
+)
+
+var reLoc = regexp.MustCompile(`^[a-z][a-z][a-z]?(?:_[A-Z][A-Z])?\.(.+)`)
+
+var mblenTable = map[string]int{
+	"utf-8":   6,
+	"utf8":    6,
+	"jis":     8,
+	"eucjp":   3,
+	"euckr":   2,
+	"euccn":   2,
+	"sjis":    2,
+	"cp932":   2,
+	"cp51932": 2,
+	"cp936":   2,
+	"cp949":   2,
+	"cp950":   2,
+	"big5":    2,
+	"gbk":     2,
+	"gb2312":  2,
+}
+
+func isEastAsian(locale string) bool {
+	charset := strings.ToLower(locale)
+	r := reLoc.FindStringSubmatch(locale)
+	if len(r) == 2 {
+		charset = strings.ToLower(r[1])
+	}
+
+	if strings.HasSuffix(charset, "@cjk_narrow") {
+		return false
+	}
+
+	for pos, b := range []byte(charset) {
+		if b == '@' {
+			charset = charset[:pos]
+			break
+		}
+	}
+	max := 1
+	if m, ok := mblenTable[charset]; ok {
+		max = m
+	}
+	if max > 1 && (charset[0] != 'u' ||
+		strings.HasPrefix(locale, "ja") ||
+		strings.HasPrefix(locale, "ko") ||
+		strings.HasPrefix(locale, "zh")) {
+		return true
+	}
+	return false
+}
+
+// IsEastAsian return true if the current locale is CJK
+func IsEastAsian() bool {
+	locale := os.Getenv("LC_CTYPE")
+	if locale == "" {
+		locale = os.Getenv("LANG")
+	}
+
+	// ignore C locale
+	if locale == "POSIX" || locale == "C" {
+		return false
+	}
+	if len(locale) > 1 && locale[0] == 'C' && (locale[1] == '.' || locale[1] == '-') {
+		return false
+	}
+
+	return isEastAsian(locale)
+}
diff --git a/vendor/github.com/mattn/go-runewidth/runewidth_table.go b/vendor/github.com/mattn/go-runewidth/runewidth_table.go
new file mode 100644
index 00000000..9ca6d0e2
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/runewidth_table.go
@@ -0,0 +1,427 @@
+package runewidth
+
+var combining = table{
+	{0x0300, 0x036F}, {0x0483, 0x0489}, {0x07EB, 0x07F3},
+	{0x0C00, 0x0C00}, {0x0C04, 0x0C04}, {0x0D00, 0x0D01},
+	{0x135D, 0x135F}, {0x1A7F, 0x1A7F}, {0x1AB0, 0x1ABE},
+	{0x1B6B, 0x1B73}, {0x1DC0, 0x1DF9}, {0x1DFB, 0x1DFF},
+	{0x20D0, 0x20F0}, {0x2CEF, 0x2CF1}, {0x2DE0, 0x2DFF},
+	{0x3099, 0x309A}, {0xA66F, 0xA672}, {0xA674, 0xA67D},
+	{0xA69E, 0xA69F}, {0xA6F0, 0xA6F1}, {0xA8E0, 0xA8F1},
+	{0xFE20, 0xFE2F}, {0x101FD, 0x101FD}, {0x10376, 0x1037A},
+	{0x10F46, 0x10F50}, {0x11300, 0x11301}, {0x1133B, 0x1133C},
+	{0x11366, 0x1136C}, {0x11370, 0x11374}, {0x16AF0, 0x16AF4},
+	{0x1D165, 0x1D169}, {0x1D16D, 0x1D172}, {0x1D17B, 0x1D182},
+	{0x1D185, 0x1D18B}, {0x1D1AA, 0x1D1AD}, {0x1D242, 0x1D244},
+	{0x1E000, 0x1E006}, {0x1E008, 0x1E018}, {0x1E01B, 0x1E021},
+	{0x1E023, 0x1E024}, {0x1E026, 0x1E02A}, {0x1E8D0, 0x1E8D6},
+}
+
+var doublewidth = table{
+	{0x1100, 0x115F}, {0x231A, 0x231B}, {0x2329, 0x232A},
+	{0x23E9, 0x23EC}, {0x23F0, 0x23F0}, {0x23F3, 0x23F3},
+	{0x25FD, 0x25FE}, {0x2614, 0x2615}, {0x2648, 0x2653},
+	{0x267F, 0x267F}, {0x2693, 0x2693}, {0x26A1, 0x26A1},
+	{0x26AA, 0x26AB}, {0x26BD, 0x26BE}, {0x26C4, 0x26C5},
+	{0x26CE, 0x26CE}, {0x26D4, 0x26D4}, {0x26EA, 0x26EA},
+	{0x26F2, 0x26F3}, {0x26F5, 0x26F5}, {0x26FA, 0x26FA},
+	{0x26FD, 0x26FD}, {0x2705, 0x2705}, {0x270A, 0x270B},
+	{0x2728, 0x2728}, {0x274C, 0x274C}, {0x274E, 0x274E},
+	{0x2753, 0x2755}, {0x2757, 0x2757}, {0x2795, 0x2797},
+	{0x27B0, 0x27B0}, {0x27BF, 0x27BF}, {0x2B1B, 0x2B1C},
+	{0x2B50, 0x2B50}, {0x2B55, 0x2B55}, {0x2E80, 0x2E99},
+	{0x2E9B, 0x2EF3}, {0x2F00, 0x2FD5}, {0x2FF0, 0x2FFB},
+	{0x3000, 0x303E}, {0x3041, 0x3096}, {0x3099, 0x30FF},
+	{0x3105, 0x312F}, {0x3131, 0x318E}, {0x3190, 0x31BA},
+	{0x31C0, 0x31E3}, {0x31F0, 0x321E}, {0x3220, 0x3247},
+	{0x3250, 0x4DBF}, {0x4E00, 0xA48C}, {0xA490, 0xA4C6},
+	{0xA960, 0xA97C}, {0xAC00, 0xD7A3}, {0xF900, 0xFAFF},
+	{0xFE10, 0xFE19}, {0xFE30, 0xFE52}, {0xFE54, 0xFE66},
+	{0xFE68, 0xFE6B}, {0xFF01, 0xFF60}, {0xFFE0, 0xFFE6},
+	{0x16FE0, 0x16FE3}, {0x17000, 0x187F7}, {0x18800, 0x18AF2},
+	{0x1B000, 0x1B11E}, {0x1B150, 0x1B152}, {0x1B164, 0x1B167},
+	{0x1B170, 0x1B2FB}, {0x1F004, 0x1F004}, {0x1F0CF, 0x1F0CF},
+	{0x1F18E, 0x1F18E}, {0x1F191, 0x1F19A}, {0x1F200, 0x1F202},
+	{0x1F210, 0x1F23B}, {0x1F240, 0x1F248}, {0x1F250, 0x1F251},
+	{0x1F260, 0x1F265}, {0x1F300, 0x1F320}, {0x1F32D, 0x1F335},
+	{0x1F337, 0x1F37C}, {0x1F37E, 0x1F393}, {0x1F3A0, 0x1F3CA},
+	{0x1F3CF, 0x1F3D3}, {0x1F3E0, 0x1F3F0}, {0x1F3F4, 0x1F3F4},
+	{0x1F3F8, 0x1F43E}, {0x1F440, 0x1F440}, {0x1F442, 0x1F4FC},
+	{0x1F4FF, 0x1F53D}, {0x1F54B, 0x1F54E}, {0x1F550, 0x1F567},
+	{0x1F57A, 0x1F57A}, {0x1F595, 0x1F596}, {0x1F5A4, 0x1F5A4},
+	{0x1F5FB, 0x1F64F}, {0x1F680, 0x1F6C5}, {0x1F6CC, 0x1F6CC},
+	{0x1F6D0, 0x1F6D2}, {0x1F6D5, 0x1F6D5}, {0x1F6EB, 0x1F6EC},
+	{0x1F6F4, 0x1F6FA}, {0x1F7E0, 0x1F7EB}, {0x1F90D, 0x1F971},
+	{0x1F973, 0x1F976}, {0x1F97A, 0x1F9A2}, {0x1F9A5, 0x1F9AA},
+	{0x1F9AE, 0x1F9CA}, {0x1F9CD, 0x1F9FF}, {0x1FA70, 0x1FA73},
+	{0x1FA78, 0x1FA7A}, {0x1FA80, 0x1FA82}, {0x1FA90, 0x1FA95},
+	{0x20000, 0x2FFFD}, {0x30000, 0x3FFFD},
+}
+
+var ambiguous = table{
+	{0x00A1, 0x00A1}, {0x00A4, 0x00A4}, {0x00A7, 0x00A8},
+	{0x00AA, 0x00AA}, {0x00AD, 0x00AE}, {0x00B0, 0x00B4},
+	{0x00B6, 0x00BA}, {0x00BC, 0x00BF}, {0x00C6, 0x00C6},
+	{0x00D0, 0x00D0}, {0x00D7, 0x00D8}, {0x00DE, 0x00E1},
+	{0x00E6, 0x00E6}, {0x00E8, 0x00EA}, {0x00EC, 0x00ED},
+	{0x00F0, 0x00F0}, {0x00F2, 0x00F3}, {0x00F7, 0x00FA},
+	{0x00FC, 0x00FC}, {0x00FE, 0x00FE}, {0x0101, 0x0101},
+	{0x0111, 0x0111}, {0x0113, 0x0113}, {0x011B, 0x011B},
+	{0x0126, 0x0127}, {0x012B, 0x012B}, {0x0131, 0x0133},
+	{0x0138, 0x0138}, {0x013F, 0x0142}, {0x0144, 0x0144},
+	{0x0148, 0x014B}, {0x014D, 0x014D}, {0x0152, 0x0153},
+	{0x0166, 0x0167}, {0x016B, 0x016B}, {0x01CE, 0x01CE},
+	{0x01D0, 0x01D0}, {0x01D2, 0x01D2}, {0x01D4, 0x01D4},
+	{0x01D6, 0x01D6}, {0x01D8, 0x01D8}, {0x01DA, 0x01DA},
+	{0x01DC, 0x01DC}, {0x0251, 0x0251}, {0x0261, 0x0261},
+	{0x02C4, 0x02C4}, {0x02C7, 0x02C7}, {0x02C9, 0x02CB},
+	{0x02CD, 0x02CD}, {0x02D0, 0x02D0}, {0x02D8, 0x02DB},
+	{0x02DD, 0x02DD}, {0x02DF, 0x02DF}, {0x0300, 0x036F},
+	{0x0391, 0x03A1}, {0x03A3, 0x03A9}, {0x03B1, 0x03C1},
+	{0x03C3, 0x03C9}, {0x0401, 0x0401}, {0x0410, 0x044F},
+	{0x0451, 0x0451}, {0x2010, 0x2010}, {0x2013, 0x2016},
+	{0x2018, 0x2019}, {0x201C, 0x201D}, {0x2020, 0x2022},
+	{0x2024, 0x2027}, {0x2030, 0x2030}, {0x2032, 0x2033},
+	{0x2035, 0x2035}, {0x203B, 0x203B}, {0x203E, 0x203E},
+	{0x2074, 0x2074}, {0x207F, 0x207F}, {0x2081, 0x2084},
+	{0x20AC, 0x20AC}, {0x2103, 0x2103}, {0x2105, 0x2105},
+	{0x2109, 0x2109}, {0x2113, 0x2113}, {0x2116, 0x2116},
+	{0x2121, 0x2122}, {0x2126, 0x2126}, {0x212B, 0x212B},
+	{0x2153, 0x2154}, {0x215B, 0x215E}, {0x2160, 0x216B},
+	{0x2170, 0x2179}, {0x2189, 0x2189}, {0x2190, 0x2199},
+	{0x21B8, 0x21B9}, {0x21D2, 0x21D2}, {0x21D4, 0x21D4},
+	{0x21E7, 0x21E7}, {0x2200, 0x2200}, {0x2202, 0x2203},
+	{0x2207, 0x2208}, {0x220B, 0x220B}, {0x220F, 0x220F},
+	{0x2211, 0x2211}, {0x2215, 0x2215}, {0x221A, 0x221A},
+	{0x221D, 0x2220}, {0x2223, 0x2223}, {0x2225, 0x2225},
+	{0x2227, 0x222C}, {0x222E, 0x222E}, {0x2234, 0x2237},
+	{0x223C, 0x223D}, {0x2248, 0x2248}, {0x224C, 0x224C},
+	{0x2252, 0x2252}, {0x2260, 0x2261}, {0x2264, 0x2267},
+	{0x226A, 0x226B}, {0x226E, 0x226F}, {0x2282, 0x2283},
+	{0x2286, 0x2287}, {0x2295, 0x2295}, {0x2299, 0x2299},
+	{0x22A5, 0x22A5}, {0x22BF, 0x22BF}, {0x2312, 0x2312},
+	{0x2460, 0x24E9}, {0x24EB, 0x254B}, {0x2550, 0x2573},
+	{0x2580, 0x258F}, {0x2592, 0x2595}, {0x25A0, 0x25A1},
+	{0x25A3, 0x25A9}, {0x25B2, 0x25B3}, {0x25B6, 0x25B7},
+	{0x25BC, 0x25BD}, {0x25C0, 0x25C1}, {0x25C6, 0x25C8},
+	{0x25CB, 0x25CB}, {0x25CE, 0x25D1}, {0x25E2, 0x25E5},
+	{0x25EF, 0x25EF}, {0x2605, 0x2606}, {0x2609, 0x2609},
+	{0x260E, 0x260F}, {0x261C, 0x261C}, {0x261E, 0x261E},
+	{0x2640, 0x2640}, {0x2642, 0x2642}, {0x2660, 0x2661},
+	{0x2663, 0x2665}, {0x2667, 0x266A}, {0x266C, 0x266D},
+	{0x266F, 0x266F}, {0x269E, 0x269F}, {0x26BF, 0x26BF},
+	{0x26C6, 0x26CD}, {0x26CF, 0x26D3}, {0x26D5, 0x26E1},
+	{0x26E3, 0x26E3}, {0x26E8, 0x26E9}, {0x26EB, 0x26F1},
+	{0x26F4, 0x26F4}, {0x26F6, 0x26F9}, {0x26FB, 0x26FC},
+	{0x26FE, 0x26FF}, {0x273D, 0x273D}, {0x2776, 0x277F},
+	{0x2B56, 0x2B59}, {0x3248, 0x324F}, {0xE000, 0xF8FF},
+	{0xFE00, 0xFE0F}, {0xFFFD, 0xFFFD}, {0x1F100, 0x1F10A},
+	{0x1F110, 0x1F12D}, {0x1F130, 0x1F169}, {0x1F170, 0x1F18D},
+	{0x1F18F, 0x1F190}, {0x1F19B, 0x1F1AC}, {0xE0100, 0xE01EF},
+	{0xF0000, 0xFFFFD}, {0x100000, 0x10FFFD},
+}
+var notassigned = table{
+	{0x27E6, 0x27ED}, {0x2985, 0x2986},
+}
+
+var neutral = table{
+	{0x0000, 0x001F}, {0x007F, 0x00A0}, {0x00A9, 0x00A9},
+	{0x00AB, 0x00AB}, {0x00B5, 0x00B5}, {0x00BB, 0x00BB},
+	{0x00C0, 0x00C5}, {0x00C7, 0x00CF}, {0x00D1, 0x00D6},
+	{0x00D9, 0x00DD}, {0x00E2, 0x00E5}, {0x00E7, 0x00E7},
+	{0x00EB, 0x00EB}, {0x00EE, 0x00EF}, {0x00F1, 0x00F1},
+	{0x00F4, 0x00F6}, {0x00FB, 0x00FB}, {0x00FD, 0x00FD},
+	{0x00FF, 0x0100}, {0x0102, 0x0110}, {0x0112, 0x0112},
+	{0x0114, 0x011A}, {0x011C, 0x0125}, {0x0128, 0x012A},
+	{0x012C, 0x0130}, {0x0134, 0x0137}, {0x0139, 0x013E},
+	{0x0143, 0x0143}, {0x0145, 0x0147}, {0x014C, 0x014C},
+	{0x014E, 0x0151}, {0x0154, 0x0165}, {0x0168, 0x016A},
+	{0x016C, 0x01CD}, {0x01CF, 0x01CF}, {0x01D1, 0x01D1},
+	{0x01D3, 0x01D3}, {0x01D5, 0x01D5}, {0x01D7, 0x01D7},
+	{0x01D9, 0x01D9}, {0x01DB, 0x01DB}, {0x01DD, 0x0250},
+	{0x0252, 0x0260}, {0x0262, 0x02C3}, {0x02C5, 0x02C6},
+	{0x02C8, 0x02C8}, {0x02CC, 0x02CC}, {0x02CE, 0x02CF},
+	{0x02D1, 0x02D7}, {0x02DC, 0x02DC}, {0x02DE, 0x02DE},
+	{0x02E0, 0x02FF}, {0x0370, 0x0377}, {0x037A, 0x037F},
+	{0x0384, 0x038A}, {0x038C, 0x038C}, {0x038E, 0x0390},
+	{0x03AA, 0x03B0}, {0x03C2, 0x03C2}, {0x03CA, 0x0400},
+	{0x0402, 0x040F}, {0x0450, 0x0450}, {0x0452, 0x052F},
+	{0x0531, 0x0556}, {0x0559, 0x058A}, {0x058D, 0x058F},
+	{0x0591, 0x05C7}, {0x05D0, 0x05EA}, {0x05EF, 0x05F4},
+	{0x0600, 0x061C}, {0x061E, 0x070D}, {0x070F, 0x074A},
+	{0x074D, 0x07B1}, {0x07C0, 0x07FA}, {0x07FD, 0x082D},
+	{0x0830, 0x083E}, {0x0840, 0x085B}, {0x085E, 0x085E},
+	{0x0860, 0x086A}, {0x08A0, 0x08B4}, {0x08B6, 0x08BD},
+	{0x08D3, 0x0983}, {0x0985, 0x098C}, {0x098F, 0x0990},
+	{0x0993, 0x09A8}, {0x09AA, 0x09B0}, {0x09B2, 0x09B2},
+	{0x09B6, 0x09B9}, {0x09BC, 0x09C4}, {0x09C7, 0x09C8},
+	{0x09CB, 0x09CE}, {0x09D7, 0x09D7}, {0x09DC, 0x09DD},
+	{0x09DF, 0x09E3}, {0x09E6, 0x09FE}, {0x0A01, 0x0A03},
+	{0x0A05, 0x0A0A}, {0x0A0F, 0x0A10}, {0x0A13, 0x0A28},
+	{0x0A2A, 0x0A30}, {0x0A32, 0x0A33}, {0x0A35, 0x0A36},
+	{0x0A38, 0x0A39}, {0x0A3C, 0x0A3C}, {0x0A3E, 0x0A42},
+	{0x0A47, 0x0A48}, {0x0A4B, 0x0A4D}, {0x0A51, 0x0A51},
+	{0x0A59, 0x0A5C}, {0x0A5E, 0x0A5E}, {0x0A66, 0x0A76},
+	{0x0A81, 0x0A83}, {0x0A85, 0x0A8D}, {0x0A8F, 0x0A91},
+	{0x0A93, 0x0AA8}, {0x0AAA, 0x0AB0}, {0x0AB2, 0x0AB3},
+	{0x0AB5, 0x0AB9}, {0x0ABC, 0x0AC5}, {0x0AC7, 0x0AC9},
+	{0x0ACB, 0x0ACD}, {0x0AD0, 0x0AD0}, {0x0AE0, 0x0AE3},
+	{0x0AE6, 0x0AF1}, {0x0AF9, 0x0AFF}, {0x0B01, 0x0B03},
+	{0x0B05, 0x0B0C}, {0x0B0F, 0x0B10}, {0x0B13, 0x0B28},
+	{0x0B2A, 0x0B30}, {0x0B32, 0x0B33}, {0x0B35, 0x0B39},
+	{0x0B3C, 0x0B44}, {0x0B47, 0x0B48}, {0x0B4B, 0x0B4D},
+	{0x0B56, 0x0B57}, {0x0B5C, 0x0B5D}, {0x0B5F, 0x0B63},
+	{0x0B66, 0x0B77}, {0x0B82, 0x0B83}, {0x0B85, 0x0B8A},
+	{0x0B8E, 0x0B90}, {0x0B92, 0x0B95}, {0x0B99, 0x0B9A},
+	{0x0B9C, 0x0B9C}, {0x0B9E, 0x0B9F}, {0x0BA3, 0x0BA4},
+	{0x0BA8, 0x0BAA}, {0x0BAE, 0x0BB9}, {0x0BBE, 0x0BC2},
+	{0x0BC6, 0x0BC8}, {0x0BCA, 0x0BCD}, {0x0BD0, 0x0BD0},
+	{0x0BD7, 0x0BD7}, {0x0BE6, 0x0BFA}, {0x0C00, 0x0C0C},
+	{0x0C0E, 0x0C10}, {0x0C12, 0x0C28}, {0x0C2A, 0x0C39},
+	{0x0C3D, 0x0C44}, {0x0C46, 0x0C48}, {0x0C4A, 0x0C4D},
+	{0x0C55, 0x0C56}, {0x0C58, 0x0C5A}, {0x0C60, 0x0C63},
+	{0x0C66, 0x0C6F}, {0x0C77, 0x0C8C}, {0x0C8E, 0x0C90},
+	{0x0C92, 0x0CA8}, {0x0CAA, 0x0CB3}, {0x0CB5, 0x0CB9},
+	{0x0CBC, 0x0CC4}, {0x0CC6, 0x0CC8}, {0x0CCA, 0x0CCD},
+	{0x0CD5, 0x0CD6}, {0x0CDE, 0x0CDE}, {0x0CE0, 0x0CE3},
+	{0x0CE6, 0x0CEF}, {0x0CF1, 0x0CF2}, {0x0D00, 0x0D03},
+	{0x0D05, 0x0D0C}, {0x0D0E, 0x0D10}, {0x0D12, 0x0D44},
+	{0x0D46, 0x0D48}, {0x0D4A, 0x0D4F}, {0x0D54, 0x0D63},
+	{0x0D66, 0x0D7F}, {0x0D82, 0x0D83}, {0x0D85, 0x0D96},
+	{0x0D9A, 0x0DB1}, {0x0DB3, 0x0DBB}, {0x0DBD, 0x0DBD},
+	{0x0DC0, 0x0DC6}, {0x0DCA, 0x0DCA}, {0x0DCF, 0x0DD4},
+	{0x0DD6, 0x0DD6}, {0x0DD8, 0x0DDF}, {0x0DE6, 0x0DEF},
+	{0x0DF2, 0x0DF4}, {0x0E01, 0x0E3A}, {0x0E3F, 0x0E5B},
+	{0x0E81, 0x0E82}, {0x0E84, 0x0E84}, {0x0E86, 0x0E8A},
+	{0x0E8C, 0x0EA3}, {0x0EA5, 0x0EA5}, {0x0EA7, 0x0EBD},
+	{0x0EC0, 0x0EC4}, {0x0EC6, 0x0EC6}, {0x0EC8, 0x0ECD},
+	{0x0ED0, 0x0ED9}, {0x0EDC, 0x0EDF}, {0x0F00, 0x0F47},
+	{0x0F49, 0x0F6C}, {0x0F71, 0x0F97}, {0x0F99, 0x0FBC},
+	{0x0FBE, 0x0FCC}, {0x0FCE, 0x0FDA}, {0x1000, 0x10C5},
+	{0x10C7, 0x10C7}, {0x10CD, 0x10CD}, {0x10D0, 0x10FF},
+	{0x1160, 0x1248}, {0x124A, 0x124D}, {0x1250, 0x1256},
+	{0x1258, 0x1258}, {0x125A, 0x125D}, {0x1260, 0x1288},
+	{0x128A, 0x128D}, {0x1290, 0x12B0}, {0x12B2, 0x12B5},
+	{0x12B8, 0x12BE}, {0x12C0, 0x12C0}, {0x12C2, 0x12C5},
+	{0x12C8, 0x12D6}, {0x12D8, 0x1310}, {0x1312, 0x1315},
+	{0x1318, 0x135A}, {0x135D, 0x137C}, {0x1380, 0x1399},
+	{0x13A0, 0x13F5}, {0x13F8, 0x13FD}, {0x1400, 0x169C},
+	{0x16A0, 0x16F8}, {0x1700, 0x170C}, {0x170E, 0x1714},
+	{0x1720, 0x1736}, {0x1740, 0x1753}, {0x1760, 0x176C},
+	{0x176E, 0x1770}, {0x1772, 0x1773}, {0x1780, 0x17DD},
+	{0x17E0, 0x17E9}, {0x17F0, 0x17F9}, {0x1800, 0x180E},
+	{0x1810, 0x1819}, {0x1820, 0x1878}, {0x1880, 0x18AA},
+	{0x18B0, 0x18F5}, {0x1900, 0x191E}, {0x1920, 0x192B},
+	{0x1930, 0x193B}, {0x1940, 0x1940}, {0x1944, 0x196D},
+	{0x1970, 0x1974}, {0x1980, 0x19AB}, {0x19B0, 0x19C9},
+	{0x19D0, 0x19DA}, {0x19DE, 0x1A1B}, {0x1A1E, 0x1A5E},
+	{0x1A60, 0x1A7C}, {0x1A7F, 0x1A89}, {0x1A90, 0x1A99},
+	{0x1AA0, 0x1AAD}, {0x1AB0, 0x1ABE}, {0x1B00, 0x1B4B},
+	{0x1B50, 0x1B7C}, {0x1B80, 0x1BF3}, {0x1BFC, 0x1C37},
+	{0x1C3B, 0x1C49}, {0x1C4D, 0x1C88}, {0x1C90, 0x1CBA},
+	{0x1CBD, 0x1CC7}, {0x1CD0, 0x1CFA}, {0x1D00, 0x1DF9},
+	{0x1DFB, 0x1F15}, {0x1F18, 0x1F1D}, {0x1F20, 0x1F45},
+	{0x1F48, 0x1F4D}, {0x1F50, 0x1F57}, {0x1F59, 0x1F59},
+	{0x1F5B, 0x1F5B}, {0x1F5D, 0x1F5D}, {0x1F5F, 0x1F7D},
+	{0x1F80, 0x1FB4}, {0x1FB6, 0x1FC4}, {0x1FC6, 0x1FD3},
+	{0x1FD6, 0x1FDB}, {0x1FDD, 0x1FEF}, {0x1FF2, 0x1FF4},
+	{0x1FF6, 0x1FFE}, {0x2000, 0x200F}, {0x2011, 0x2012},
+	{0x2017, 0x2017}, {0x201A, 0x201B}, {0x201E, 0x201F},
+	{0x2023, 0x2023}, {0x2028, 0x202F}, {0x2031, 0x2031},
+	{0x2034, 0x2034}, {0x2036, 0x203A}, {0x203C, 0x203D},
+	{0x203F, 0x2064}, {0x2066, 0x2071}, {0x2075, 0x207E},
+	{0x2080, 0x2080}, {0x2085, 0x208E}, {0x2090, 0x209C},
+	{0x20A0, 0x20A8}, {0x20AA, 0x20AB}, {0x20AD, 0x20BF},
+	{0x20D0, 0x20F0}, {0x2100, 0x2102}, {0x2104, 0x2104},
+	{0x2106, 0x2108}, {0x210A, 0x2112}, {0x2114, 0x2115},
+	{0x2117, 0x2120}, {0x2123, 0x2125}, {0x2127, 0x212A},
+	{0x212C, 0x2152}, {0x2155, 0x215A}, {0x215F, 0x215F},
+	{0x216C, 0x216F}, {0x217A, 0x2188}, {0x218A, 0x218B},
+	{0x219A, 0x21B7}, {0x21BA, 0x21D1}, {0x21D3, 0x21D3},
+	{0x21D5, 0x21E6}, {0x21E8, 0x21FF}, {0x2201, 0x2201},
+	{0x2204, 0x2206}, {0x2209, 0x220A}, {0x220C, 0x220E},
+	{0x2210, 0x2210}, {0x2212, 0x2214}, {0x2216, 0x2219},
+	{0x221B, 0x221C}, {0x2221, 0x2222}, {0x2224, 0x2224},
+	{0x2226, 0x2226}, {0x222D, 0x222D}, {0x222F, 0x2233},
+	{0x2238, 0x223B}, {0x223E, 0x2247}, {0x2249, 0x224B},
+	{0x224D, 0x2251}, {0x2253, 0x225F}, {0x2262, 0x2263},
+	{0x2268, 0x2269}, {0x226C, 0x226D}, {0x2270, 0x2281},
+	{0x2284, 0x2285}, {0x2288, 0x2294}, {0x2296, 0x2298},
+	{0x229A, 0x22A4}, {0x22A6, 0x22BE}, {0x22C0, 0x2311},
+	{0x2313, 0x2319}, {0x231C, 0x2328}, {0x232B, 0x23E8},
+	{0x23ED, 0x23EF}, {0x23F1, 0x23F2}, {0x23F4, 0x2426},
+	{0x2440, 0x244A}, {0x24EA, 0x24EA}, {0x254C, 0x254F},
+	{0x2574, 0x257F}, {0x2590, 0x2591}, {0x2596, 0x259F},
+	{0x25A2, 0x25A2}, {0x25AA, 0x25B1}, {0x25B4, 0x25B5},
+	{0x25B8, 0x25BB}, {0x25BE, 0x25BF}, {0x25C2, 0x25C5},
+	{0x25C9, 0x25CA}, {0x25CC, 0x25CD}, {0x25D2, 0x25E1},
+	{0x25E6, 0x25EE}, {0x25F0, 0x25FC}, {0x25FF, 0x2604},
+	{0x2607, 0x2608}, {0x260A, 0x260D}, {0x2610, 0x2613},
+	{0x2616, 0x261B}, {0x261D, 0x261D}, {0x261F, 0x263F},
+	{0x2641, 0x2641}, {0x2643, 0x2647}, {0x2654, 0x265F},
+	{0x2662, 0x2662}, {0x2666, 0x2666}, {0x266B, 0x266B},
+	{0x266E, 0x266E}, {0x2670, 0x267E}, {0x2680, 0x2692},
+	{0x2694, 0x269D}, {0x26A0, 0x26A0}, {0x26A2, 0x26A9},
+	{0x26AC, 0x26BC}, {0x26C0, 0x26C3}, {0x26E2, 0x26E2},
+	{0x26E4, 0x26E7}, {0x2700, 0x2704}, {0x2706, 0x2709},
+	{0x270C, 0x2727}, {0x2729, 0x273C}, {0x273E, 0x274B},
+	{0x274D, 0x274D}, {0x274F, 0x2752}, {0x2756, 0x2756},
+	{0x2758, 0x2775}, {0x2780, 0x2794}, {0x2798, 0x27AF},
+	{0x27B1, 0x27BE}, {0x27C0, 0x27E5}, {0x27EE, 0x2984},
+	{0x2987, 0x2B1A}, {0x2B1D, 0x2B4F}, {0x2B51, 0x2B54},
+	{0x2B5A, 0x2B73}, {0x2B76, 0x2B95}, {0x2B98, 0x2C2E},
+	{0x2C30, 0x2C5E}, {0x2C60, 0x2CF3}, {0x2CF9, 0x2D25},
+	{0x2D27, 0x2D27}, {0x2D2D, 0x2D2D}, {0x2D30, 0x2D67},
+	{0x2D6F, 0x2D70}, {0x2D7F, 0x2D96}, {0x2DA0, 0x2DA6},
+	{0x2DA8, 0x2DAE}, {0x2DB0, 0x2DB6}, {0x2DB8, 0x2DBE},
+	{0x2DC0, 0x2DC6}, {0x2DC8, 0x2DCE}, {0x2DD0, 0x2DD6},
+	{0x2DD8, 0x2DDE}, {0x2DE0, 0x2E4F}, {0x303F, 0x303F},
+	{0x4DC0, 0x4DFF}, {0xA4D0, 0xA62B}, {0xA640, 0xA6F7},
+	{0xA700, 0xA7BF}, {0xA7C2, 0xA7C6}, {0xA7F7, 0xA82B},
+	{0xA830, 0xA839}, {0xA840, 0xA877}, {0xA880, 0xA8C5},
+	{0xA8CE, 0xA8D9}, {0xA8E0, 0xA953}, {0xA95F, 0xA95F},
+	{0xA980, 0xA9CD}, {0xA9CF, 0xA9D9}, {0xA9DE, 0xA9FE},
+	{0xAA00, 0xAA36}, {0xAA40, 0xAA4D}, {0xAA50, 0xAA59},
+	{0xAA5C, 0xAAC2}, {0xAADB, 0xAAF6}, {0xAB01, 0xAB06},
+	{0xAB09, 0xAB0E}, {0xAB11, 0xAB16}, {0xAB20, 0xAB26},
+	{0xAB28, 0xAB2E}, {0xAB30, 0xAB67}, {0xAB70, 0xABED},
+	{0xABF0, 0xABF9}, {0xD7B0, 0xD7C6}, {0xD7CB, 0xD7FB},
+	{0xD800, 0xDFFF}, {0xFB00, 0xFB06}, {0xFB13, 0xFB17},
+	{0xFB1D, 0xFB36}, {0xFB38, 0xFB3C}, {0xFB3E, 0xFB3E},
+	{0xFB40, 0xFB41}, {0xFB43, 0xFB44}, {0xFB46, 0xFBC1},
+	{0xFBD3, 0xFD3F}, {0xFD50, 0xFD8F}, {0xFD92, 0xFDC7},
+	{0xFDF0, 0xFDFD}, {0xFE20, 0xFE2F}, {0xFE70, 0xFE74},
+	{0xFE76, 0xFEFC}, {0xFEFF, 0xFEFF}, {0xFFF9, 0xFFFC},
+	{0x10000, 0x1000B}, {0x1000D, 0x10026}, {0x10028, 0x1003A},
+	{0x1003C, 0x1003D}, {0x1003F, 0x1004D}, {0x10050, 0x1005D},
+	{0x10080, 0x100FA}, {0x10100, 0x10102}, {0x10107, 0x10133},
+	{0x10137, 0x1018E}, {0x10190, 0x1019B}, {0x101A0, 0x101A0},
+	{0x101D0, 0x101FD}, {0x10280, 0x1029C}, {0x102A0, 0x102D0},
+	{0x102E0, 0x102FB}, {0x10300, 0x10323}, {0x1032D, 0x1034A},
+	{0x10350, 0x1037A}, {0x10380, 0x1039D}, {0x1039F, 0x103C3},
+	{0x103C8, 0x103D5}, {0x10400, 0x1049D}, {0x104A0, 0x104A9},
+	{0x104B0, 0x104D3}, {0x104D8, 0x104FB}, {0x10500, 0x10527},
+	{0x10530, 0x10563}, {0x1056F, 0x1056F}, {0x10600, 0x10736},
+	{0x10740, 0x10755}, {0x10760, 0x10767}, {0x10800, 0x10805},
+	{0x10808, 0x10808}, {0x1080A, 0x10835}, {0x10837, 0x10838},
+	{0x1083C, 0x1083C}, {0x1083F, 0x10855}, {0x10857, 0x1089E},
+	{0x108A7, 0x108AF}, {0x108E0, 0x108F2}, {0x108F4, 0x108F5},
+	{0x108FB, 0x1091B}, {0x1091F, 0x10939}, {0x1093F, 0x1093F},
+	{0x10980, 0x109B7}, {0x109BC, 0x109CF}, {0x109D2, 0x10A03},
+	{0x10A05, 0x10A06}, {0x10A0C, 0x10A13}, {0x10A15, 0x10A17},
+	{0x10A19, 0x10A35}, {0x10A38, 0x10A3A}, {0x10A3F, 0x10A48},
+	{0x10A50, 0x10A58}, {0x10A60, 0x10A9F}, {0x10AC0, 0x10AE6},
+	{0x10AEB, 0x10AF6}, {0x10B00, 0x10B35}, {0x10B39, 0x10B55},
+	{0x10B58, 0x10B72}, {0x10B78, 0x10B91}, {0x10B99, 0x10B9C},
+	{0x10BA9, 0x10BAF}, {0x10C00, 0x10C48}, {0x10C80, 0x10CB2},
+	{0x10CC0, 0x10CF2}, {0x10CFA, 0x10D27}, {0x10D30, 0x10D39},
+	{0x10E60, 0x10E7E}, {0x10F00, 0x10F27}, {0x10F30, 0x10F59},
+	{0x10FE0, 0x10FF6}, {0x11000, 0x1104D}, {0x11052, 0x1106F},
+	{0x1107F, 0x110C1}, {0x110CD, 0x110CD}, {0x110D0, 0x110E8},
+	{0x110F0, 0x110F9}, {0x11100, 0x11134}, {0x11136, 0x11146},
+	{0x11150, 0x11176}, {0x11180, 0x111CD}, {0x111D0, 0x111DF},
+	{0x111E1, 0x111F4}, {0x11200, 0x11211}, {0x11213, 0x1123E},
+	{0x11280, 0x11286}, {0x11288, 0x11288}, {0x1128A, 0x1128D},
+	{0x1128F, 0x1129D}, {0x1129F, 0x112A9}, {0x112B0, 0x112EA},
+	{0x112F0, 0x112F9}, {0x11300, 0x11303}, {0x11305, 0x1130C},
+	{0x1130F, 0x11310}, {0x11313, 0x11328}, {0x1132A, 0x11330},
+	{0x11332, 0x11333}, {0x11335, 0x11339}, {0x1133B, 0x11344},
+	{0x11347, 0x11348}, {0x1134B, 0x1134D}, {0x11350, 0x11350},
+	{0x11357, 0x11357}, {0x1135D, 0x11363}, {0x11366, 0x1136C},
+	{0x11370, 0x11374}, {0x11400, 0x11459}, {0x1145B, 0x1145B},
+	{0x1145D, 0x1145F}, {0x11480, 0x114C7}, {0x114D0, 0x114D9},
+	{0x11580, 0x115B5}, {0x115B8, 0x115DD}, {0x11600, 0x11644},
+	{0x11650, 0x11659}, {0x11660, 0x1166C}, {0x11680, 0x116B8},
+	{0x116C0, 0x116C9}, {0x11700, 0x1171A}, {0x1171D, 0x1172B},
+	{0x11730, 0x1173F}, {0x11800, 0x1183B}, {0x118A0, 0x118F2},
+	{0x118FF, 0x118FF}, {0x119A0, 0x119A7}, {0x119AA, 0x119D7},
+	{0x119DA, 0x119E4}, {0x11A00, 0x11A47}, {0x11A50, 0x11AA2},
+	{0x11AC0, 0x11AF8}, {0x11C00, 0x11C08}, {0x11C0A, 0x11C36},
+	{0x11C38, 0x11C45}, {0x11C50, 0x11C6C}, {0x11C70, 0x11C8F},
+	{0x11C92, 0x11CA7}, {0x11CA9, 0x11CB6}, {0x11D00, 0x11D06},
+	{0x11D08, 0x11D09}, {0x11D0B, 0x11D36}, {0x11D3A, 0x11D3A},
+	{0x11D3C, 0x11D3D}, {0x11D3F, 0x11D47}, {0x11D50, 0x11D59},
+	{0x11D60, 0x11D65}, {0x11D67, 0x11D68}, {0x11D6A, 0x11D8E},
+	{0x11D90, 0x11D91}, {0x11D93, 0x11D98}, {0x11DA0, 0x11DA9},
+	{0x11EE0, 0x11EF8}, {0x11FC0, 0x11FF1}, {0x11FFF, 0x12399},
+	{0x12400, 0x1246E}, {0x12470, 0x12474}, {0x12480, 0x12543},
+	{0x13000, 0x1342E}, {0x13430, 0x13438}, {0x14400, 0x14646},
+	{0x16800, 0x16A38}, {0x16A40, 0x16A5E}, {0x16A60, 0x16A69},
+	{0x16A6E, 0x16A6F}, {0x16AD0, 0x16AED}, {0x16AF0, 0x16AF5},
+	{0x16B00, 0x16B45}, {0x16B50, 0x16B59}, {0x16B5B, 0x16B61},
+	{0x16B63, 0x16B77}, {0x16B7D, 0x16B8F}, {0x16E40, 0x16E9A},
+	{0x16F00, 0x16F4A}, {0x16F4F, 0x16F87}, {0x16F8F, 0x16F9F},
+	{0x1BC00, 0x1BC6A}, {0x1BC70, 0x1BC7C}, {0x1BC80, 0x1BC88},
+	{0x1BC90, 0x1BC99}, {0x1BC9C, 0x1BCA3}, {0x1D000, 0x1D0F5},
+	{0x1D100, 0x1D126}, {0x1D129, 0x1D1E8}, {0x1D200, 0x1D245},
+	{0x1D2E0, 0x1D2F3}, {0x1D300, 0x1D356}, {0x1D360, 0x1D378},
+	{0x1D400, 0x1D454}, {0x1D456, 0x1D49C}, {0x1D49E, 0x1D49F},
+	{0x1D4A2, 0x1D4A2}, {0x1D4A5, 0x1D4A6}, {0x1D4A9, 0x1D4AC},
+	{0x1D4AE, 0x1D4B9}, {0x1D4BB, 0x1D4BB}, {0x1D4BD, 0x1D4C3},
+	{0x1D4C5, 0x1D505}, {0x1D507, 0x1D50A}, {0x1D50D, 0x1D514},
+	{0x1D516, 0x1D51C}, {0x1D51E, 0x1D539}, {0x1D53B, 0x1D53E},
+	{0x1D540, 0x1D544}, {0x1D546, 0x1D546}, {0x1D54A, 0x1D550},
+	{0x1D552, 0x1D6A5}, {0x1D6A8, 0x1D7CB}, {0x1D7CE, 0x1DA8B},
+	{0x1DA9B, 0x1DA9F}, {0x1DAA1, 0x1DAAF}, {0x1E000, 0x1E006},
+	{0x1E008, 0x1E018}, {0x1E01B, 0x1E021}, {0x1E023, 0x1E024},
+	{0x1E026, 0x1E02A}, {0x1E100, 0x1E12C}, {0x1E130, 0x1E13D},
+	{0x1E140, 0x1E149}, {0x1E14E, 0x1E14F}, {0x1E2C0, 0x1E2F9},
+	{0x1E2FF, 0x1E2FF}, {0x1E800, 0x1E8C4}, {0x1E8C7, 0x1E8D6},
+	{0x1E900, 0x1E94B}, {0x1E950, 0x1E959}, {0x1E95E, 0x1E95F},
+	{0x1EC71, 0x1ECB4}, {0x1ED01, 0x1ED3D}, {0x1EE00, 0x1EE03},
+	{0x1EE05, 0x1EE1F}, {0x1EE21, 0x1EE22}, {0x1EE24, 0x1EE24},
+	{0x1EE27, 0x1EE27}, {0x1EE29, 0x1EE32}, {0x1EE34, 0x1EE37},
+	{0x1EE39, 0x1EE39}, {0x1EE3B, 0x1EE3B}, {0x1EE42, 0x1EE42},
+	{0x1EE47, 0x1EE47}, {0x1EE49, 0x1EE49}, {0x1EE4B, 0x1EE4B},
+	{0x1EE4D, 0x1EE4F}, {0x1EE51, 0x1EE52}, {0x1EE54, 0x1EE54},
+	{0x1EE57, 0x1EE57}, {0x1EE59, 0x1EE59}, {0x1EE5B, 0x1EE5B},
+	{0x1EE5D, 0x1EE5D}, {0x1EE5F, 0x1EE5F}, {0x1EE61, 0x1EE62},
+	{0x1EE64, 0x1EE64}, {0x1EE67, 0x1EE6A}, {0x1EE6C, 0x1EE72},
+	{0x1EE74, 0x1EE77}, {0x1EE79, 0x1EE7C}, {0x1EE7E, 0x1EE7E},
+	{0x1EE80, 0x1EE89}, {0x1EE8B, 0x1EE9B}, {0x1EEA1, 0x1EEA3},
+	{0x1EEA5, 0x1EEA9}, {0x1EEAB, 0x1EEBB}, {0x1EEF0, 0x1EEF1},
+	{0x1F000, 0x1F003}, {0x1F005, 0x1F02B}, {0x1F030, 0x1F093},
+	{0x1F0A0, 0x1F0AE}, {0x1F0B1, 0x1F0BF}, {0x1F0C1, 0x1F0CE},
+	{0x1F0D1, 0x1F0F5}, {0x1F10B, 0x1F10C}, {0x1F12E, 0x1F12F},
+	{0x1F16A, 0x1F16C}, {0x1F1E6, 0x1F1FF}, {0x1F321, 0x1F32C},
+	{0x1F336, 0x1F336}, {0x1F37D, 0x1F37D}, {0x1F394, 0x1F39F},
+	{0x1F3CB, 0x1F3CE}, {0x1F3D4, 0x1F3DF}, {0x1F3F1, 0x1F3F3},
+	{0x1F3F5, 0x1F3F7}, {0x1F43F, 0x1F43F}, {0x1F441, 0x1F441},
+	{0x1F4FD, 0x1F4FE}, {0x1F53E, 0x1F54A}, {0x1F54F, 0x1F54F},
+	{0x1F568, 0x1F579}, {0x1F57B, 0x1F594}, {0x1F597, 0x1F5A3},
+	{0x1F5A5, 0x1F5FA}, {0x1F650, 0x1F67F}, {0x1F6C6, 0x1F6CB},
+	{0x1F6CD, 0x1F6CF}, {0x1F6D3, 0x1F6D4}, {0x1F6E0, 0x1F6EA},
+	{0x1F6F0, 0x1F6F3}, {0x1F700, 0x1F773}, {0x1F780, 0x1F7D8},
+	{0x1F800, 0x1F80B}, {0x1F810, 0x1F847}, {0x1F850, 0x1F859},
+	{0x1F860, 0x1F887}, {0x1F890, 0x1F8AD}, {0x1F900, 0x1F90B},
+	{0x1FA00, 0x1FA53}, {0x1FA60, 0x1FA6D}, {0xE0001, 0xE0001},
+	{0xE0020, 0xE007F},
+}
+
+var emoji = table{
+	{0x203C, 0x203C}, {0x2049, 0x2049}, {0x2122, 0x2122},
+	{0x2139, 0x2139}, {0x2194, 0x2199}, {0x21A9, 0x21AA},
+	{0x231A, 0x231B}, {0x2328, 0x2328}, {0x2388, 0x2388},
+	{0x23CF, 0x23CF}, {0x23E9, 0x23F3}, {0x23F8, 0x23FA},
+	{0x24C2, 0x24C2}, {0x25AA, 0x25AB}, {0x25B6, 0x25B6},
+	{0x25C0, 0x25C0}, {0x25FB, 0x25FE}, {0x2600, 0x2605},
+	{0x2607, 0x2612}, {0x2614, 0x2685}, {0x2690, 0x2705},
+	{0x2708, 0x2712}, {0x2714, 0x2714}, {0x2716, 0x2716},
+	{0x271D, 0x271D}, {0x2721, 0x2721}, {0x2728, 0x2728},
+	{0x2733, 0x2734}, {0x2744, 0x2744}, {0x2747, 0x2747},
+	{0x274C, 0x274C}, {0x274E, 0x274E}, {0x2753, 0x2755},
+	{0x2757, 0x2757}, {0x2763, 0x2767}, {0x2795, 0x2797},
+	{0x27A1, 0x27A1}, {0x27B0, 0x27B0}, {0x27BF, 0x27BF},
+	{0x2934, 0x2935}, {0x2B05, 0x2B07}, {0x2B1B, 0x2B1C},
+	{0x2B50, 0x2B50}, {0x2B55, 0x2B55}, {0x3030, 0x3030},
+	{0x303D, 0x303D}, {0x3297, 0x3297}, {0x3299, 0x3299},
+	{0x1F000, 0x1F0FF}, {0x1F10D, 0x1F10F}, {0x1F12F, 0x1F12F},
+	{0x1F16C, 0x1F171}, {0x1F17E, 0x1F17F}, {0x1F18E, 0x1F18E},
+	{0x1F191, 0x1F19A}, {0x1F1AD, 0x1F1E5}, {0x1F201, 0x1F20F},
+	{0x1F21A, 0x1F21A}, {0x1F22F, 0x1F22F}, {0x1F232, 0x1F23A},
+	{0x1F23C, 0x1F23F}, {0x1F249, 0x1F3FA}, {0x1F400, 0x1F53D},
+	{0x1F546, 0x1F64F}, {0x1F680, 0x1F6FF}, {0x1F774, 0x1F77F},
+	{0x1F7D5, 0x1F7FF}, {0x1F80C, 0x1F80F}, {0x1F848, 0x1F84F},
+	{0x1F85A, 0x1F85F}, {0x1F888, 0x1F88F}, {0x1F8AE, 0x1F8FF},
+	{0x1F90C, 0x1F93A}, {0x1F93C, 0x1F945}, {0x1F947, 0x1FFFD},
+}
diff --git a/vendor/github.com/mattn/go-runewidth/runewidth_windows.go b/vendor/github.com/mattn/go-runewidth/runewidth_windows.go
new file mode 100644
index 00000000..d6a61777
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/runewidth_windows.go
@@ -0,0 +1,28 @@
+// +build windows
+// +build !appengine
+
+package runewidth
+
+import (
+	"syscall"
+)
+
+var (
+	kernel32               = syscall.NewLazyDLL("kernel32")
+	procGetConsoleOutputCP = kernel32.NewProc("GetConsoleOutputCP")
+)
+
+// IsEastAsian return true if the current locale is CJK
+func IsEastAsian() bool {
+	r1, _, _ := procGetConsoleOutputCP.Call()
+	if r1 == 0 {
+		return false
+	}
+
+	switch int(r1) {
+	case 932, 51932, 936, 949, 950:
+		return true
+	}
+
+	return false
+}
diff --git a/vendor/github.com/mattn/godown/.gitignore b/vendor/github.com/mattn/godown/.gitignore
new file mode 100644
index 00000000..2c77a177
--- /dev/null
+++ b/vendor/github.com/mattn/godown/.gitignore
@@ -0,0 +1,2 @@
+*.swp
+godown
diff --git a/vendor/github.com/mattn/godown/.travis.yml b/vendor/github.com/mattn/godown/.travis.yml
new file mode 100644
index 00000000..4a9344d1
--- /dev/null
+++ b/vendor/github.com/mattn/godown/.travis.yml
@@ -0,0 +1,14 @@
+language: go
+
+go:
+  - 1.8
+  - 1.9.3
+
+env:
+  secure: "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"
+
+script:
+  go test -v -race -coverprofile=coverage.txt -covermode=atomic
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
diff --git a/vendor/github.com/mattn/godown/LICENSE b/vendor/github.com/mattn/godown/LICENSE
new file mode 100644
index 00000000..e364750d
--- /dev/null
+++ b/vendor/github.com/mattn/godown/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 Yasuhiro Matsumoto
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/mattn/godown/README.md b/vendor/github.com/mattn/godown/README.md
new file mode 100644
index 00000000..a94f4157
--- /dev/null
+++ b/vendor/github.com/mattn/godown/README.md
@@ -0,0 +1,42 @@
+# godown
+
+[![Build Status](https://travis-ci.org/mattn/godown.png?branch=master)](https://travis-ci.org/mattn/godown)
+[![Codecov](https://codecov.io/gh/mattn/godown/branch/master/graph/badge.svg)](https://codecov.io/gh/mattn/godown)
+[![GoDoc](https://godoc.org/github.com/mattn/godown?status.svg)](http://godoc.org/github.com/mattn/godown)
+[![Go Report Card](https://goreportcard.com/badge/github.com/mattn/godown)](https://goreportcard.com/report/github.com/mattn/godown)
+
+Convert HTML into Markdown
+
+This is work in progress.
+
+## Usage
+
+```
+err := godown.Convert(w, r)
+checkError(err)
+```
+
+
+## Command Line
+
+```
+$ godown < index.html > index.md
+```
+
+## Installation
+
+```
+$ go get github.com/mattn/godown/cmd/godown
+```
+
+## TODO
+
+* escape strings in HTML
+
+## License
+
+MIT
+
+## Author
+
+Yasuhiro Matsumoto (a.k.a. mattn)
diff --git a/vendor/github.com/mattn/godown/godown.go b/vendor/github.com/mattn/godown/godown.go
new file mode 100644
index 00000000..10423be9
--- /dev/null
+++ b/vendor/github.com/mattn/godown/godown.go
@@ -0,0 +1,372 @@
+package godown
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"regexp"
+	"strings"
+
+	"github.com/mattn/go-runewidth"
+
+	"golang.org/x/net/html"
+)
+
+func isChildOf(node *html.Node, name string) bool {
+	node = node.Parent
+	return node != nil && node.Type == html.ElementNode && strings.ToLower(node.Data) == name
+}
+
+func hasClass(node *html.Node, clazz string) bool {
+	for _, attr := range node.Attr {
+		if attr.Key == "class" {
+			for _, c := range strings.Fields(attr.Val) {
+				if c == clazz {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
+func attr(node *html.Node, key string) string {
+	for _, attr := range node.Attr {
+		if attr.Key == key {
+			return attr.Val
+		}
+	}
+	return ""
+}
+
+func br(node *html.Node, w io.Writer, option *Option) {
+	node = node.PrevSibling
+	if node == nil {
+		return
+	}
+	switch node.Type {
+	case html.TextNode:
+		text := strings.Trim(node.Data, " \t")
+		if text != "" && !strings.HasSuffix(text, "\n") {
+			fmt.Fprint(w, "\n")
+		}
+	case html.ElementNode:
+		switch strings.ToLower(node.Data) {
+		case "br", "p", "ul", "ol", "div", "blockquote", "h1", "h2", "h3", "h4", "h5", "h6":
+			fmt.Fprint(w, "\n")
+		}
+	}
+}
+
+func table(node *html.Node, w io.Writer, option *Option) {
+	for tr := node.FirstChild; tr != nil; tr = tr.NextSibling {
+		if tr.Type == html.ElementNode && strings.ToLower(tr.Data) == "tbody" {
+			node = tr
+			break
+		}
+	}
+	var header bool
+	var rows [][]string
+	for tr := node.FirstChild; tr != nil; tr = tr.NextSibling {
+		if tr.Type != html.ElementNode || strings.ToLower(tr.Data) != "tr" {
+			continue
+		}
+		var cols []string
+		if !header {
+			for th := tr.FirstChild; th != nil; th = th.NextSibling {
+				if th.Type != html.ElementNode || strings.ToLower(th.Data) != "th" {
+					continue
+				}
+				var buf bytes.Buffer
+				walk(th, &buf, 0, option)
+				cols = append(cols, buf.String())
+			}
+			if len(cols) > 0 {
+				rows = append(rows, cols)
+				header = true
+				continue
+			}
+		}
+		for td := tr.FirstChild; td != nil; td = td.NextSibling {
+			if td.Type != html.ElementNode || strings.ToLower(td.Data) != "td" {
+				continue
+			}
+			var buf bytes.Buffer
+			walk(td, &buf, 0, option)
+			cols = append(cols, buf.String())
+		}
+		rows = append(rows, cols)
+	}
+	maxcol := 0
+	for _, cols := range rows {
+		if len(cols) > maxcol {
+			maxcol = len(cols)
+		}
+	}
+	widths := make([]int, maxcol)
+	for _, cols := range rows {
+		for i := 0; i < maxcol; i++ {
+			if i < len(cols) {
+				width := runewidth.StringWidth(cols[i])
+				if widths[i] < width {
+					widths[i] = width
+				}
+			}
+		}
+	}
+	for i, cols := range rows {
+		for j := 0; j < maxcol; j++ {
+			fmt.Fprint(w, "|")
+			if j < len(cols) {
+				width := runewidth.StringWidth(cols[j])
+				fmt.Fprint(w, cols[j])
+				fmt.Fprint(w, strings.Repeat(" ", widths[j]-width))
+			} else {
+				fmt.Fprint(w, strings.Repeat(" ", widths[j]))
+			}
+		}
+		fmt.Fprint(w, "|\n")
+		if i == 0 && header {
+			for j := 0; j < maxcol; j++ {
+				fmt.Fprint(w, "|")
+				fmt.Fprint(w, strings.Repeat("-", widths[j]))
+			}
+			fmt.Fprint(w, "|\n")
+		}
+	}
+	fmt.Fprint(w, "\n")
+}
+
+var emptyElements = []string{
+	"area",
+	"base",
+	"br",
+	"col",
+	"embed",
+	"hr",
+	"img",
+	"input",
+	"keygen",
+	"link",
+	"meta",
+	"param",
+	"source",
+	"track",
+	"wbr",
+}
+
+func raw(node *html.Node, w io.Writer, option *Option) {
+	switch node.Type {
+	case html.ElementNode:
+		fmt.Fprintf(w, "<%s", node.Data)
+		for _, attr := range node.Attr {
+			fmt.Fprintf(w, " %s=%q", attr.Key, attr.Val)
+		}
+		found := false
+		tag := strings.ToLower(node.Data)
+		for _, e := range emptyElements {
+			if e == tag {
+				found = true
+				break
+			}
+		}
+		if found {
+			fmt.Fprint(w, "/>")
+		} else {
+			fmt.Fprint(w, ">")
+			for c := node.FirstChild; c != nil; c = c.NextSibling {
+				raw(c, w, option)
+			}
+			fmt.Fprintf(w, "</%s>", node.Data)
+		}
+	case html.TextNode:
+		fmt.Fprint(w, node.Data)
+	}
+}
+
+func bq(node *html.Node, w io.Writer, option *Option) {
+	if node.Type == html.TextNode {
+		fmt.Fprint(w, strings.Replace(node.Data, "\u00a0", " ", -1))
+	} else {
+		for c := node.FirstChild; c != nil; c = c.NextSibling {
+			bq(c, w, option)
+		}
+	}
+}
+
+func pre(node *html.Node, w io.Writer, option *Option) {
+	if node.Type == html.TextNode {
+		fmt.Fprint(w, node.Data)
+	} else {
+		for c := node.FirstChild; c != nil; c = c.NextSibling {
+			pre(c, w, option)
+		}
+	}
+}
+
+func walk(node *html.Node, w io.Writer, nest int, option *Option) {
+	if node.Type == html.TextNode {
+		if strings.TrimSpace(node.Data) != "" {
+			text := regexp.MustCompile(`[[:space:]][[:space:]]*`).ReplaceAllString(strings.Trim(node.Data, "\t\r\n"), " ")
+			fmt.Fprint(w, text)
+		}
+	}
+	n := 0
+	for c := node.FirstChild; c != nil; c = c.NextSibling {
+		switch c.Type {
+		case html.CommentNode:
+			fmt.Fprint(w, "<!--")
+			fmt.Fprint(w, c.Data)
+			fmt.Fprint(w, "-->\n")
+		case html.ElementNode:
+			switch strings.ToLower(c.Data) {
+			case "a":
+				fmt.Fprint(w, "[")
+				walk(c, w, nest, option)
+				fmt.Fprint(w, "]("+attr(c, "href")+")")
+			case "b", "strong":
+				fmt.Fprint(w, "**")
+				walk(c, w, nest, option)
+				fmt.Fprint(w, "**")
+			case "i", "em":
+				fmt.Fprint(w, "_")
+				walk(c, w, nest, option)
+				fmt.Fprint(w, "_")
+			case "del":
+				fmt.Fprint(w, "~~")
+				walk(c, w, nest, option)
+				fmt.Fprint(w, "~~")
+			case "br":
+				br(c, w, option)
+				fmt.Fprint(w, "\n\n")
+			case "p":
+				br(c, w, option)
+				walk(c, w, nest, option)
+				br(c, w, option)
+				fmt.Fprint(w, "\n\n")
+			case "code":
+				if !isChildOf(c, "pre") {
+					fmt.Fprint(w, "`")
+					pre(c, w, option)
+					fmt.Fprint(w, "`")
+				}
+			case "pre":
+				br(c, w, option)
+				var buf bytes.Buffer
+				pre(c, &buf, option)
+				var lang string
+				if option != nil && option.GuessLang != nil {
+					if guess, err := option.GuessLang(buf.String()); err == nil {
+						lang = guess
+					}
+				}
+				fmt.Fprint(w, "```"+lang+"\n")
+				fmt.Fprint(w, buf.String())
+				if !strings.HasSuffix(buf.String(), "\n") {
+					fmt.Fprint(w, "\n")
+				}
+				fmt.Fprint(w, "```\n\n")
+			case "div":
+				br(c, w, option)
+				walk(c, w, nest, option)
+				fmt.Fprint(w, "\n")
+			case "blockquote":
+				br(c, w, option)
+				var buf bytes.Buffer
+				if hasClass(c, "code") {
+					bq(c, &buf, option)
+					var lang string
+					if option != nil && option.GuessLang != nil {
+						if guess, err := option.GuessLang(buf.String()); err == nil {
+							lang = guess
+						}
+					}
+					fmt.Fprint(w, "```"+lang+"\n")
+					fmt.Fprint(w, strings.TrimLeft(buf.String(), "\n"))
+					if !strings.HasSuffix(buf.String(), "\n") {
+						fmt.Fprint(w, "\n")
+					}
+					fmt.Fprint(w, "```\n\n")
+				} else {
+					walk(c, &buf, nest+1, option)
+
+					if lines := strings.Split(strings.TrimSpace(buf.String()), "\n"); len(lines) > 0 {
+						for _, l := range lines {
+							fmt.Fprint(w, "> "+strings.TrimSpace(l)+"\n")
+						}
+						fmt.Fprint(w, "\n")
+					}
+				}
+			case "ul", "ol":
+				br(c, w, option)
+				var buf bytes.Buffer
+				walk(c, &buf, 1, option)
+				if lines := strings.Split(strings.TrimSpace(buf.String()), "\n"); len(lines) > 0 {
+					for i, l := range lines {
+						if i > 0 || nest > 0 {
+							fmt.Fprint(w, "\n")
+						}
+						fmt.Fprint(w, strings.Repeat("    ", nest)+strings.TrimSpace(l))
+					}
+					fmt.Fprint(w, "\n")
+				}
+			case "li":
+				br(c, w, option)
+				if isChildOf(c, "ul") {
+					fmt.Fprint(w, "* ")
+				} else if isChildOf(c, "ol") {
+					n++
+					fmt.Fprint(w, fmt.Sprintf("%d. ", n))
+				}
+				walk(c, w, nest, option)
+				fmt.Fprint(w, "\n")
+			case "h1", "h2", "h3", "h4", "h5", "h6":
+				br(c, w, option)
+				fmt.Fprint(w, strings.Repeat("#", int(rune(c.Data[1])-rune('0')))+" ")
+				walk(c, w, nest, option)
+				fmt.Fprint(w, "\n\n")
+			case "img":
+				fmt.Fprint(w, "!["+attr(c, "alt")+"]("+attr(c, "src")+")")
+			case "hr":
+				br(c, w, option)
+				fmt.Fprint(w, "\n---\n\n")
+			case "table":
+				br(c, w, option)
+				table(c, w, option)
+			case "style":
+				if option != nil && option.Style {
+					br(c, w, option)
+					raw(c, w, option)
+					fmt.Fprint(w, "\n\n")
+				}
+			case "script":
+				if option != nil && option.Script {
+					br(c, w, option)
+					raw(c, w, option)
+					fmt.Fprint(w, "\n\n")
+				}
+			default:
+				walk(c, w, nest, option)
+			}
+		default:
+			walk(c, w, nest, option)
+		}
+	}
+}
+
+type Option struct {
+	GuessLang func(string) (string, error)
+	Script    bool
+	Style     bool
+}
+
+// Convert convert HTML to Markdown. Read HTML from r and write to w.
+func Convert(w io.Writer, r io.Reader, option *Option) error {
+	doc, err := html.Parse(r)
+	if err != nil {
+		return err
+	}
+	walk(doc, w, 0, option)
+	fmt.Fprint(w, "\n")
+	return nil
+}