From 94e3a6450bf7be33dce02eff4526f8da32e15c42 Mon Sep 17 00:00:00 2001
From: James R <justsomejames2@gmail.com>
Date: Mon, 24 Apr 2023 15:02:53 -0700
Subject: [PATCH] Add respawnat command, lightsnake to a specific waypoint

---
 src/d_netcmd.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/m_cheat.c  | 14 ++++++++++
 src/m_cheat.h  |  2 ++
 3 files changed, 88 insertions(+)

diff --git a/src/d_netcmd.c b/src/d_netcmd.c
index f97203ce0..a470bc9ce 100644
--- a/src/d_netcmd.c
+++ b/src/d_netcmd.c
@@ -1109,6 +1109,7 @@ void D_RegisterClientCommands(void)
 	COM_AddCommand("grayscale", Command_Grayscale_f);
 	COM_AddCommand("goto", Command_Goto_f);
 	COM_AddCommand("angle", Command_Angle_f);
+	COM_AddCommand("respawnat", Command_RespawnAt_f);
 	CV_RegisterVar(&cv_renderhitbox);
 	CV_RegisterVar(&cv_devmode_screen);
 
@@ -2034,6 +2035,10 @@ void D_Cheat(INT32 playernum, INT32 cheat, ...)
 		case CHEAT_ANGLE:
 			COPY(WRITEANGLE, angle_t);
 			break;
+
+		case CHEAT_RESPAWNAT:
+			COPY(WRITEINT32, INT32);
+			break;
 	}
 
 #undef COPY
@@ -6017,6 +6022,73 @@ static void Got_Cheat(UINT8 **cp, INT32 playernum)
 			break;
 		}
 
+		case CHEAT_RESPAWNAT: {
+			INT32 id = READINT32(*cp);
+			waypoint_t *finish = K_GetFinishLineWaypoint();
+			waypoint_t *waypoint = K_GetWaypointFromID(id);
+			path_t path = {0};
+			boolean retryBackwards = false;
+			const UINT32 baseDist = FixedMul(RESPAWN_DIST, mapobjectscale);
+
+			CV_CheaterWarning(targetPlayer, va("respawnat %d", id));
+
+			if (waypoint == NULL)
+			{
+				CONS_Alert(CONS_WARNING, "respawnat: no waypoint with that ID\n");
+				break;
+			}
+
+			// First, just try to go forward normally
+			if (K_PathfindToWaypoint(player->respawn.wp, waypoint, &path, false, false))
+			{
+				// If the path forward is too short, extend it by moving the origin behind
+				if (path.totaldist < baseDist)
+				{
+					retryBackwards = true;
+				}
+				else
+				{
+					size_t i;
+
+					for (i = 0; i < path.numnodes; ++i)
+					{
+						// If we had to cross the finish line, this waypoint is behind us
+						if (path.array[i].nodedata == finish)
+						{
+							retryBackwards = true;
+							break;
+						}
+					}
+				}
+
+				Z_Free(path.array);
+			}
+			else
+			{
+				retryBackwards = true;
+			}
+
+			if (retryBackwards)
+			{
+				memset(&path, 0, sizeof path);
+				if (!K_PathfindThruCircuit(waypoint, baseDist, &path, false, true))
+				{
+					CONS_Alert(CONS_WARNING, "respawnat: no path to waypoint\n");
+					break;
+				}
+
+				// Update origin since lightsnake must go forwards
+				player->respawn.wp = path.array[path.numnodes - 1].nodedata;
+
+				Z_Free(path.array);
+			}
+
+			player->respawn.state = RESPAWNST_NONE;
+			K_DoIngameRespawn(player);
+			player->respawn.distanceleft = retryBackwards ? baseDist : path.totaldist;
+			break;
+		}
+
 		case NUMBER_OF_CHEATS:
 			break;
 	}
diff --git a/src/m_cheat.c b/src/m_cheat.c
index d4e774f43..e4aec3b41 100644
--- a/src/m_cheat.c
+++ b/src/m_cheat.c
@@ -614,6 +614,20 @@ void Command_Angle_f(void)
 	D_Cheat(consoleplayer, CHEAT_ANGLE, angle);
 }
 
+void Command_RespawnAt_f(void)
+{
+	REQUIRE_CHEATS;
+	REQUIRE_INLEVEL;
+
+	if (COM_Argc() != 2)
+	{
+		CONS_Printf(M_GetText("respawnat <waypoint id>: lightsnake to a specific waypoint\n"));
+		return;
+	}
+
+	D_Cheat(consoleplayer, CHEAT_RESPAWNAT, atoi(COM_Argv(1)));
+}
+
 //
 // OBJECTPLACE (and related variables)
 //
diff --git a/src/m_cheat.h b/src/m_cheat.h
index d3c808d3e..45d57eaae 100644
--- a/src/m_cheat.h
+++ b/src/m_cheat.h
@@ -38,6 +38,7 @@ typedef enum {
 	CHEAT_GIVEITEM,
 	CHEAT_SCORE,
 	CHEAT_ANGLE,
+	CHEAT_RESPAWNAT,
 
 	NUMBER_OF_CHEATS
 } cheat_t;
@@ -86,6 +87,7 @@ void Command_Weather_f(void);
 void Command_Grayscale_f(void);
 void Command_Goto_f(void);
 void Command_Angle_f(void);
+void Command_RespawnAt_f(void);
 #ifdef _DEBUG
 void Command_CauseCfail_f(void);
 #endif