Defer parsing URLs until a buffer is opened at least once

This heavily reduces CPU load on start, so that we only parse the links
of the current buffer hundreds of messages, rather than all of the
hundreds of messages * count of buffers.

1 files changed, 11 insertions, 2 deletions

diff --git a/ui/buffers.go b/ui/buffers.go
index 553de9e..b94e21a 100644
--- a/ui/buffers.go
+++ b/ui/buffers.go
@@ -186,6 +186,7 @@ type buffer struct {
 	highlights int
 	unread     bool
 	read       time.Time
+	openedOnce bool
 
 	lines []Line
 	topic string
@@ -359,7 +360,7 @@ func (bs *BufferList) AddLine(netID, title string, notify NotifyType, line Line)
 	n := len(b.lines)
 	line.At = line.At.UTC()
 
-	if !line.Mergeable {
+	if !line.Mergeable && current.openedOnce {
 		line.Body = line.Body.ParseURLs()
 	}
 
@@ -401,7 +402,9 @@ func (bs *BufferList) AddLines(netID, title string, before, after []Line) {
 				}
 			} else {
 				if buf != &b.lines {
-					line.Body = line.Body.ParseURLs()
+					if b.openedOnce {
+						line.Body = line.Body.ParseURLs()
+					}
 					line.computeSplitPoints()
 				}
 				lines = append(lines, line)
@@ -686,6 +689,12 @@ func (bs *BufferList) DrawTimeline(screen tcell.Screen, x0, y0, nickColWidth int
 	clearArea(screen, x0, y0, bs.tlInnerWidth+nickColWidth+9, bs.tlHeight+2)
 
 	b := bs.cur()
+	if !b.openedOnce {
+		b.openedOnce = true
+		for i := 0; i < len(b.lines); i++ {
+			b.lines[i].Body = b.lines[i].Body.ParseURLs()
+		}
+	}
 
 	xTopic := x0
 	printString(screen, &xTopic, y0, Styled(b.topic, tcell.StyleDefault))