contrib: Make log visualizer work with CI

Update the log visualizer to detect logs coming from CI and be able to render them.

ChangelogNone

Author: ddustin

contrib/log_visualizer.html

@@ -154,6 +154,25 @@
 		document.getElementById('filter_error').innerText = error.message;
 	}
 }
+function node_to_regex(node)
+{
+	return new RegExp(`[0-9\-T:.Z]+ ${node} `, "g");
+}
+function detect_ci_logs(logs)
+{
+	nodes = new Set()
+	Array.from(logs.matchAll(/[0-9\-T:.Z]+ (lightningd-[0-9]+) /g)).forEach(match => {
+		nodes.add(match[1]);
+	});
+	if (!nodes.size)
+		return null;
+	keys = [...nodes];
+	if (nodes.size == 1)
+		return node_to_regex(keys[0])
+
+	str = "Continous Integration log with multiple nodes detected.\n\nWhich would you like rendered?\n\nNodes detected:\n" + keys.join("\n");
+	return node_to_regex(prompt(str, keys[0]).trim());
+}
 function do_render(logs, area)
 {
 	var d = document;
@@ -168,11 +187,21 @@
 	while(sheet.cssRules.length)
 		sheet.deleteRule(0);
 
+	prefix = detect_ci_logs(logs);
+
 	for(line of logs.split("\n")) {
 		line = line.trim()
 		if(!line.length)
 			continue;
 
+		/* Detect and eat node prefix. If no prefix match, ignore line */
+		if (prefix) {
+			prefix_match = line.match(prefix);
+			if(!prefix_match)
+				continue;
+			line = line.slice(prefix_match[0].length);
+		}
+
 		info = parseLogLine(line);
 
 		if(info.msg.startsWith('Server started with public key'))