Support formatting in rainbows

Fixes #119

10 files changed, 159 insertions, 54 deletions

diff --git a/go.mod b/go.mod
index 8f7900f..dfeb7ad 100644
--- a/go.mod
+++ b/go.mod
@@ -11,6 +11,8 @@ require (
 	github.com/mattn/go-runewidth v0.0.8
 	github.com/petermattis/goid v0.0.0-20180202154549-b0b1615b78e5 // indirect
 	github.com/pkg/errors v0.9.1
+	github.com/rivo/uniseg v0.1.0
+	github.com/russross/blackfriday/v2 v2.0.1
 	github.com/sasha-s/go-deadlock v0.2.0
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
 	github.com/stretchr/testify v1.5.1
@@ -19,7 +21,7 @@ require (
 	golang.org/x/net v0.0.0-20200301022130-244492dfa37a
 	gopkg.in/toast.v1 v1.0.0-20180812000517-0a84660828b2
 	gopkg.in/yaml.v2 v2.2.8
-	maunium.net/go/mautrix v0.1.0-beta.1
+	maunium.net/go/mautrix v0.1.0-beta.1.0.20200320123139-8ba1d97ed86b
 	maunium.net/go/mauview v0.1.0-beta.1
 	maunium.net/go/tcell v0.1.0
 )
diff --git a/go.sum b/go.sum
index 0e71021..8076ac6 100644
--- a/go.sum
+++ b/go.sum
@@ -71,6 +71,10 @@ gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 maunium.net/go/mautrix v0.1.0-beta.1 h1:o7EzSO3sMf7tpNvxanITcpMw3nL3SaJ/LDpBRPaZIt8=
 maunium.net/go/mautrix v0.1.0-beta.1/go.mod h1:YFMU9DBeXH7cqx7sJLg0DkVxwNPbih8QbpUTYf/IjMM=
+maunium.net/go/mautrix v0.1.0-beta.1.0.20200320113420-8101f052c782 h1:gLsc8FRp9mIQHXjxFpdpISUCoJO8jt4SQyaFYUCLJ5U=
+maunium.net/go/mautrix v0.1.0-beta.1.0.20200320113420-8101f052c782/go.mod h1:YFMU9DBeXH7cqx7sJLg0DkVxwNPbih8QbpUTYf/IjMM=
+maunium.net/go/mautrix v0.1.0-beta.1.0.20200320123139-8ba1d97ed86b h1:sQ7w1dOTvTg76wLCUyb30+jEsVIVvI4Zw4IOPdwogIE=
+maunium.net/go/mautrix v0.1.0-beta.1.0.20200320123139-8ba1d97ed86b/go.mod h1:YFMU9DBeXH7cqx7sJLg0DkVxwNPbih8QbpUTYf/IjMM=
 maunium.net/go/mauview v0.1.0-beta.1 h1:hRprD6NTi5Mw7i97DKmgs/TzFQeNpGPytPoswNlU/Ww=
 maunium.net/go/mauview v0.1.0-beta.1/go.mod h1:og9WbzmWe9SNYNyOFlCv8qa9zMcOvG2nzRJ5vYyud9U=
 maunium.net/go/tcell v0.1.0 h1:XzsEoGCvOw5nac+tlkSLzQcliLYTN4PrtA7ar2ptjSM=
diff --git a/interface/matrix.go b/interface/matrix.go
index 6814f07..d4351d7 100644
--- a/interface/matrix.go
+++ b/interface/matrix.go
@@ -40,7 +40,7 @@ type MatrixContainer interface {
 	Logout()
 
 	SendPreferencesToMatrix()
-	PrepareMarkdownMessage(roomID string, msgtype mautrix.MessageType, message string, relation *Relation) *event.Event
+	PrepareMarkdownMessage(roomID string, msgtype mautrix.MessageType, text, html string, relation *Relation) *event.Event
 	SendEvent(evt *event.Event) (string, error)
 	Redact(roomID, eventID, reason string) error
 	SendTyping(roomID string, typing bool)
diff --git a/lib/bfhtml/doc.go b/lib/bfhtml/doc.go
deleted file mode 100644
index 4881087..0000000
--- a/lib/bfhtml/doc.go
+++ /dev/null
@@ -1,2 +0,0 @@
-// Package bfhtml contains an extension to the Blackfriday HTML renderer to disable paragraph tags.
-package bfhtml
diff --git a/lib/bfhtml/html.go b/lib/bfhtml/html.go
deleted file mode 100644
index cfffb96..0000000
--- a/lib/bfhtml/html.go
+++ /dev/null
@@ -1,34 +0,0 @@
-// gomuks - A terminal Matrix client written in Go.
-// Copyright (C) 2019 Tulir Asokan
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-package bfhtml
-
-import (
-	"io"
-
-	bf "github.com/russross/blackfriday/v2"
-)
-
-type HTMLRenderer struct {
-	*bf.HTMLRenderer
-}
-
-func (r *HTMLRenderer) RenderNode(w io.Writer, node *bf.Node, entering bool) bf.WalkStatus {
-	if node.Type == bf.Paragraph {
-		return bf.GoToNext
-	}
-	return r.HTMLRenderer.RenderNode(w, node, entering)
-}
diff --git a/matrix/matrix.go b/matrix/matrix.go
index ef5ef8a..226df6c 100644
--- a/matrix/matrix.go
+++ b/matrix/matrix.go
@@ -729,9 +729,19 @@ func (c *Container) MarkRead(roomID, eventID string) {
 	_, _ = c.client.MakeRequest("POST", urlPath, struct{}{}, nil)
 }
 
-func (c *Container) PrepareMarkdownMessage(roomID string, msgtype mautrix.MessageType, text string, rel *ifc.Relation) *event.Event {
-	content := format.RenderMarkdown(text)
-	content.MsgType = msgtype
+func (c *Container) PrepareMarkdownMessage(roomID string, msgtype mautrix.MessageType, text, html string, rel *ifc.Relation) *event.Event {
+	var content mautrix.Content
+	if html != "" {
+		content = mautrix.Content{
+			FormattedBody: html,
+			Format:        mautrix.FormatHTML,
+			Body:          text,
+			MsgType:       msgtype,
+		}
+	} else {
+		content = format.RenderMarkdown(text)
+		content.MsgType = msgtype
+	}
 
 	if rel != nil && rel.Type == mautrix.RelReplace {
 		contentCopy := content
diff --git a/matrix/sync.go b/matrix/sync.go
index 81c0596..8ec22b5 100644
--- a/matrix/sync.go
+++ b/matrix/sync.go
@@ -153,6 +153,9 @@ func (s *GomuksSyncer) ProcessResponse(res *mautrix.RespSync, since string) (err
 
 func (s *GomuksSyncer) processSyncEvents(room *rooms.Room, events []json.RawMessage, source EventSource) {
 	for _, event := range events {
+		if source == EventSourcePresence {
+			debug.Print(string(event))
+		}
 		s.processSyncEvent(room, event, source)
 	}
 }
@@ -241,7 +244,7 @@ func (s *GomuksSyncer) GetFilterJSON(userID string) json.RawMessage {
 					"m.room.power_levels",
 					"m.room.tombstone",
 				},
-				Limit: 50,
+//				Limit: 50,
 			},
 			Ephemeral: mautrix.FilterPart{
 				Types: []string{"m.typing", "m.receipt"},
diff --git a/ui/commands.go b/ui/commands.go
index 3d12eff..8cfe55d 100644
--- a/ui/commands.go
+++ b/ui/commands.go
@@ -22,6 +22,7 @@ import (
 	"io"
 	"math"
 	"os"
+	"regexp"
 	"runtime"
 	dbg "runtime/debug"
 	"runtime/pprof"
@@ -29,11 +30,12 @@ import (
 	"strconv"
 	"strings"
 	"time"
-	"unicode"
 
 	"github.com/lucasb-eyer/go-colorful"
+	"github.com/russross/blackfriday/v2"
 
 	"maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/format"
 
 	"maunium.net/go/gomuks/debug"
 )
@@ -79,16 +81,23 @@ var rainbow = GradientTable{
 // TODO this command definitely belongs in a plugin once we have a plugin system.
 func makeRainbow(cmd *Command, msgtype mautrix.MessageType) {
 	text := strings.Join(cmd.Args, " ")
-	var html strings.Builder
-	for i, char := range text {
-		if unicode.IsSpace(char) {
-			html.WriteRune(char)
-			continue
-		}
-		color := rainbow.GetInterpolatedColorFor(float64(i) / float64(len(text))).Hex()
-		_, _ = fmt.Fprintf(&html, "<font data-mx-color=\"%[1]s\" color=\"%[1]s\">%[2]c</font>", color, char)
-	}
-	go cmd.Room.SendMessage(msgtype, html.String())
+
+	render := NewRainbowRenderer(blackfriday.NewHTMLRenderer(blackfriday.HTMLRendererParameters{
+		Flags: blackfriday.UseXHTML,
+	}))
+	htmlBodyBytes := blackfriday.Run([]byte(text), format.Extensions, blackfriday.WithRenderer(render))
+	htmlBody := strings.TrimRight(string(htmlBodyBytes), "\n")
+	htmlBody = format.AntiParagraphRegex.ReplaceAllString(htmlBody, "$1")
+	text = format.HTMLToText(htmlBody)
+
+	count := strings.Count(htmlBody, render.ColorID)
+	i := -1
+	htmlBody = regexp.MustCompile(render.ColorID).ReplaceAllStringFunc(htmlBody, func(match string) string {
+		i++
+		return rainbow.GetInterpolatedColorFor(float64(i) / float64(count)).Hex()
+	})
+
+	go cmd.Room.SendMessageHTML(msgtype, text, htmlBody)
 }
 
 func cmdRainbow(cmd *Command) {
diff --git a/ui/rainbow.go b/ui/rainbow.go
new file mode 100644
index 0000000..fca3cba
--- /dev/null
+++ b/ui/rainbow.go
@@ -0,0 +1,109 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2020 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package ui
+
+import (
+	"bytes"
+	"fmt"
+	"html"
+	"io"
+	"math/rand"
+	"unicode"
+
+	"github.com/rivo/uniseg"
+	"github.com/russross/blackfriday/v2"
+)
+
+type RainbowRenderer struct {
+	*blackfriday.HTMLRenderer
+	sr *blackfriday.SPRenderer
+
+	ColorID string
+}
+
+func Rand(n int) (str string) {
+	b := make([]byte, n)
+	rand.Read(b)
+	str = fmt.Sprintf("%x", b)
+	return
+}
+
+func NewRainbowRenderer(html *blackfriday.HTMLRenderer) *RainbowRenderer {
+	return &RainbowRenderer{
+		HTMLRenderer: html,
+		sr:           blackfriday.NewSmartypantsRenderer(html.Flags),
+		ColorID:      Rand(16),
+	}
+}
+
+func (r *RainbowRenderer) RenderNode(w io.Writer, node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
+	if node.Type == blackfriday.Text {
+		var buf bytes.Buffer
+		if r.Flags&blackfriday.Smartypants != 0 {
+			var tmp bytes.Buffer
+			escapeHTML(&tmp, node.Literal)
+			r.sr.Process(&buf, tmp.Bytes())
+		} else {
+			if node.Parent.Type == blackfriday.Link {
+				escLink(&buf, node.Literal)
+			} else {
+				escapeHTML(&buf, node.Literal)
+			}
+		}
+		graphemes := uniseg.NewGraphemes(buf.String())
+		buf.Reset()
+		for graphemes.Next() {
+			runes := graphemes.Runes()
+			if len(runes) == 1 && unicode.IsSpace(runes[0]) {
+				buf.WriteRune(runes[0])
+			}
+			_, _ = fmt.Fprintf(&buf, "<font color=\"%s\">%s</font>", r.ColorID, graphemes.Str())
+		}
+		_, _ = w.Write(buf.Bytes())
+		return blackfriday.GoToNext
+	}
+	return r.HTMLRenderer.RenderNode(w, node, entering)
+}
+
+// This stuff is copied directly from blackfriday
+var htmlEscaper = [256][]byte{
+	'&': []byte("&amp;"),
+	'<': []byte("&lt;"),
+	'>': []byte("&gt;"),
+	'"': []byte("&quot;"),
+}
+
+func escapeHTML(w io.Writer, s []byte) {
+	var start, end int
+	for end < len(s) {
+		escSeq := htmlEscaper[s[end]]
+		if escSeq != nil {
+			w.Write(s[start:end])
+			w.Write(escSeq)
+			start = end + 1
+		}
+		end++
+	}
+	if start < len(s) && end <= len(s) {
+		w.Write(s[start:end])
+	}
+}
+
+func escLink(w io.Writer, text []byte) {
+	unesc := html.UnescapeString(string(text))
+	escapeHTML(w, []byte(unesc))
+}
diff --git a/ui/room-view.go b/ui/room-view.go
index 3c4be8f..ef19c9d 100644
--- a/ui/room-view.go
+++ b/ui/room-view.go
@@ -622,6 +622,10 @@ func (view *RoomView) SendReaction(eventID string, reaction string) {
 }
 
 func (view *RoomView) SendMessage(msgtype mautrix.MessageType, text string) {
+	view.SendMessageHTML(msgtype, text, "")
+}
+
+func (view *RoomView) SendMessageHTML(msgtype mautrix.MessageType, text, html string) {
 	defer debug.Recover()
 	debug.Print("Sending message", msgtype, text, "to", view.Room.ID)
 	if !view.config.Preferences.DisableEmojis {
@@ -639,7 +643,7 @@ func (view *RoomView) SendMessage(msgtype mautrix.MessageType, text string) {
 			Event: view.replying,
 		}
 	}
-	evt := view.parent.matrix.PrepareMarkdownMessage(view.Room.ID, msgtype, text, rel)
+	evt := view.parent.matrix.PrepareMarkdownMessage(view.Room.ID, msgtype, text, html, rel)
 	msg := view.parseEvent(evt.SomewhatDangerousCopy())
 	view.content.AddMessage(msg, AppendMessage)
 	view.ClearAllContext()