From 69eccc706593935395d362677b3219321c6eb853 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Sat, 6 Jan 2024 21:07:03 +0100
Subject: xP: don't let buffers grow indefinitely

Primarily for performance reasons.
---
 xP/public/xP.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/xP/public/xP.js b/xP/public/xP.js
index e4f5647..ea70bbd 100644
--- a/xP/public/xP.js
+++ b/xP/public/xP.js
@@ -197,6 +197,14 @@ function bufferResetStats(b) {
 	b.highlighted = false
 }
 
+function bufferPopExcessLines(b) {
+	// Let "new" messages be, if only because pulling the log file
+	// is much more problematic in the web browser than in xC.
+	// TODO: Make the limit configurable, or extract general.backlog_limit.
+	const old = b.lines.length - b.newMessages - b.newUnimportantMessages
+	b.lines.splice(0, old - 1000)
+}
+
 function bufferActivate(name) {
 	rpc.send({command: 'BufferActivate', bufferName: name})
 }
@@ -278,6 +286,7 @@ rpcEventHandlers.set(Relay.Event.BufferLine, e => {
 	// Initial sync: skip all other processing, let highlights be.
 	if (bufferCurrent === undefined) {
 		b.lines.push(line)
+		bufferPopExcessLines(b)
 		return
 	}
 
@@ -293,6 +302,7 @@ rpcEventHandlers.set(Relay.Event.BufferLine, e => {
 		else
 			b.newMessages++
 	}
+	bufferPopExcessLines(b)
 
 	if (e.leakToActive) {
 		let bc = buffers.get(bufferCurrent)
@@ -303,6 +313,7 @@ rpcEventHandlers.set(Relay.Event.BufferLine, e => {
 			else
 				bc.newMessages++
 		}
+		bufferPopExcessLines(bc)
 	}
 
 	if (line.isHighlight || (!visible && !line.isUnimportant &&
@@ -336,7 +347,7 @@ rpcEventHandlers.set(Relay.Event.BufferStats, e => {
 	if (b === undefined)
 		return
 
-	b.newMessages = e.newMessages,
+	b.newMessages = e.newMessages
 	b.newUnimportantMessages = e.newUnimportantMessages
 	b.highlighted = e.highlighted
 })
-- 
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