From e58414f564ed7c2650cb6684b8d87d25057c5da9 Mon Sep 17 00:00:00 2001
From: serge_shubin <serge@generalarcade.com>
Date: Mon, 23 Mar 2026 05:11:27 +0800
Subject: [PATCH] Auto-record demos with svdemo_autorecord cvar

Set svdemo_autorecord 1 to automatically record a demo on every
map load. Demo files are named <mapname>_YYYYMMDD_HHMMSS.svdm
in the svdemos/ directory.

Refactored SVD_Record_f to use SVD_StartRecording helper so both
manual and auto recording share the same code path. Also fixed
prevPlayers delta state not being cleared on recording start.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 code/server/server.h     |  1 +
 code/server/sv_init.c    |  6 ++++
 code/server/sv_netdemo.c | 70 ++++++++++++++++++++++++++++++++--------
 3 files changed, 63 insertions(+), 14 deletions(-)

diff --git a/code/server/server.h b/code/server/server.h
index 00ce6bd..ac787c9 100644
--- a/code/server/server.h
+++ b/code/server/server.h
@@ -348,6 +348,7 @@ void		SVD_Record_f( void );
 void		SVD_StopRecord_f( void );
 void		SVD_RecordFrame( void );
 void		SVD_ResetDeltaState( void );
+void		SVD_AutoRecord( void );
 void		SVD_Play_f( void );
 void		SVD_StopPlay_f( void );
 void		SVD_Stop_f( void );
diff --git a/code/server/sv_init.c b/code/server/sv_init.c
index 2c66a0d..2271f6f 100644
--- a/code/server/sv_init.c
+++ b/code/server/sv_init.c
@@ -552,6 +552,9 @@ void SV_SpawnServer( char *server, qboolean killBots ) {
 	Hunk_SetMark();
 
 	Com_Printf ("-----------------------------------\n");
+
+	// auto-record demo if enabled
+	SVD_AutoRecord();
 }
 
 /*
@@ -618,6 +621,9 @@ void SV_Init (void) {
 	sv_lanForceRate = Cvar_Get ("sv_lanForceRate", "1", CVAR_ARCHIVE );
 	sv_strictAuth = Cvar_Get ("sv_strictAuth", "1", CVAR_ARCHIVE );
 
+	// server-side demo auto-recording
+	Cvar_Get ("svdemo_autorecord", "0", CVAR_ARCHIVE);
+
 	// initialize bot cvars so they are listed and can be set before loading the botlib
 	SV_BotInitCvars();
 
diff --git a/code/server/sv_netdemo.c b/code/server/sv_netdemo.c
index 9b70979..6ddae76 100644
--- a/code/server/sv_netdemo.c
+++ b/code/server/sv_netdemo.c
@@ -321,41 +321,83 @@ static void SVD_WriteFrame( fileHandle_t f ) {
 //  Recording commands
 // ---------------------------------------------------------------
 
-void SVD_Record_f( void ) {
-	char name[MAX_OSPATH];
-	char *s;
+/*
+Start recording a demo with the given name.
+Returns qtrue on success.
+*/
+static qboolean SVD_StartRecording( const char *demoname ) {
+	char path[MAX_OSPATH];
 
 	if ( demo.recording ) {
 		Com_Printf( "Already recording a server demo.\n" );
-		return;
+		return qfalse;
 	}
 
 	if ( sv.state != SS_GAME ) {
 		Com_Printf( "Not running a server.\n" );
-		return;
+		return qfalse;
 	}
 
+	Com_sprintf( path, sizeof(path), "svdemos/%s.svdm", demoname );
+
+	demo.recordFile = FS_FOpenFileWrite( path );
+	if ( !demo.recordFile ) {
+		Com_Printf( "ERROR: couldn't open %s for writing.\n", path );
+		return qfalse;
+	}
+
+	Com_Printf( "Recording server demo to %s\n", path );
+	demo.recording = qtrue;
+
+	// clear delta state for fresh recording
+	Com_Memset( demo.prevEntities, 0, sizeof(demo.prevEntities) );
+	Com_Memset( demo.prevPlayers, 0, sizeof(demo.prevPlayers) );
+
+	SVD_WriteHeader( demo.recordFile );
+	return qtrue;
+}
+
+void SVD_Record_f( void ) {
+	char *s;
+
 	s = Cmd_Argv(1);
 	if ( !s[0] ) {
 		Com_Printf( "Usage: svdemo_record <demoname>\n" );
 		return;
 	}
 
-	Com_sprintf( name, sizeof(name), "svdemos/%s.svdm", s );
+	SVD_StartRecording( s );
+}
 
-	demo.recordFile = FS_FOpenFileWrite( name );
-	if ( !demo.recordFile ) {
-		Com_Printf( "ERROR: couldn't open %s for writing.\n", name );
+/*
+Auto-record: called from SV_SpawnServer after the map is fully loaded.
+Generates a name from map name + timestamp.
+*/
+void SVD_AutoRecord( void ) {
+	char demoname[MAX_OSPATH];
+	const char *mapname;
+	qtime_t now;
+
+	if ( demo.recording || demo.playing ) {
 		return;
 	}
 
-	Com_Printf( "Recording server demo to %s\n", name );
-	demo.recording = qtrue;
+	if ( !Cvar_VariableIntegerValue( "svdemo_autorecord" ) ) {
+		return;
+	}
 
-	// clear delta state for fresh recording
-	Com_Memset( demo.prevEntities, 0, sizeof(demo.prevEntities) );
+	if ( sv.state != SS_GAME ) {
+		return;
+	}
 
-	SVD_WriteHeader( demo.recordFile );
+	mapname = Cvar_VariableString( "mapname" );
+	Com_RealTime( &now );
+	Com_sprintf( demoname, sizeof(demoname), "%s_%04d%02d%02d_%02d%02d%02d",
+		mapname,
+		1900 + now.tm_year, 1 + now.tm_mon, now.tm_mday,
+		now.tm_hour, now.tm_min, now.tm_sec );
+
+	SVD_StartRecording( demoname );
 }
 
 void SVD_StopRecord_f( void ) {