1 files changed, 84 insertions, 0 deletions
diff --git a/ui/messages/textbase.go b/ui/messages/textbase.go
new file mode 100644
index 0000000..d7eb16c
--- /dev/null
+++ b/ui/messages/textbase.go
@@ -0,0 +1,84 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"encoding/gob"
+	"regexp"
+	"time"
+
+	"maunium.net/go/gomuks/ui/messages/tstring"
+)
+
+func init() {
+	gob.Register(BaseTextMessage{})
+}
+
+type BaseTextMessage struct {
+	BaseMessage
+}
+
+func newBaseTextMessage(id, sender, msgtype string, timestamp time.Time) BaseTextMessage {
+	return BaseTextMessage{newBaseMessage(id, sender, msgtype, timestamp)}
+}
+
+// Regular expressions used to split lines when calculating the buffer.
+//
+// From tview/textview.go
+var (
+	boundaryPattern = regexp.MustCompile("([[:punct:]]\\s*|\\s+)")
+	spacePattern    = regexp.MustCompile(`\s+`)
+)
+
+// CalculateBuffer generates the internal buffer for this message that consists
+// of the text of this message split into lines at most as wide as the width
+// parameter.
+func (msg *BaseTextMessage) calculateBufferWithText(text tstring.TString, width int) {
+	if width < 2 {
+		return
+	}
+
+	msg.buffer = []tstring.TString{}
+
+	forcedLinebreaks := text.Split('\n')
+	newlines := 0
+	for _, str := range forcedLinebreaks {
+		if len(str) == 0 && newlines < 1 {
+			msg.buffer = append(msg.buffer, tstring.TString{})
+			newlines++
+		} else {
+			newlines = 0
+		}
+		// Mostly from tview/textview.go#reindexBuffer()
+		for len(str) > 0 {
+			extract := str.Truncate(width)
+			if len(extract) < len(str) {
+				if spaces := spacePattern.FindStringIndex(str[len(extract):].String()); spaces != nil && spaces[0] == 0 {
+					extract = str[:len(extract)+spaces[1]]
+				}
+
+				matches := boundaryPattern.FindAllStringIndex(extract.String(), -1)
+				if len(matches) > 0 {
+					extract = extract[:matches[len(matches)-1][1]]
+				}
+			}
+			msg.buffer = append(msg.buffer, extract)
+			str = str[len(extract):]
+		}
+	}
+	msg.prevBufferWidth = width
+}