From fa248bf7da4c1fda7f4f0cf61b53e482eaba68fd Mon Sep 17 00:00:00 2001
From: Guy Liner <samster@disroot.org>
Date: Thu, 6 Jan 2022 12:20:59 -0500
Subject: [PATCH] Player must stop sprinting if they hit a block in front of
 them or if the player's sides are touching a wall

---
 mods/PLAYER/mcl_sprint/init.lua | 72 +++++++++++++++++++++++++++++++--
 1 file changed, 69 insertions(+), 3 deletions(-)

diff --git a/mods/PLAYER/mcl_sprint/init.lua b/mods/PLAYER/mcl_sprint/init.lua
index 4c0d609c9..805c370cf 100644
--- a/mods/PLAYER/mcl_sprint/init.lua
+++ b/mods/PLAYER/mcl_sprint/init.lua
@@ -28,7 +28,7 @@ mcl_sprint = {}
 
 mcl_sprint.SPEED = 1.3
 
-local players = {}
+players = {}
 
 -- Returns true if the player with the given name is sprinting, false if not.
 -- Returns nil if player does not exist.
@@ -40,8 +40,13 @@ function mcl_sprint.is_sprinting(playername)
 	end
 end
 
+-- Determines if a block is in front of a player
+--function mcl_sprint.touching_node(pos)
+--	local touch
+	
+
 minetest.register_on_joinplayer(function(player)
-	local playerName = player:get_player_name()
+	playerName = player:get_player_name()
 
 	players[playerName] = {
 		sprinting = false,
@@ -141,6 +146,66 @@ local function get_top_node_tile(param2, paramtype2)
 	end
 end
 
+--Is player trying to run into a wall
+-- Am I trying to run into a wall?
+local function wall_collide(pos,player)
+	local facing_dir = player:get_look_dir()
+	local detect_walls = {
+		["left"] = 0,
+		["right"] = 0
+	}
+	local too_close = 1.1
+	near = {x=pos.x, y=pos.y, z=pos.z}
+
+	--
+	if pos.x > 0 then
+		detect_walls["left"] = {x=pos.x,y=pos.y,z=pos.z-1}
+		detect_walls["right"] = {x=pos.x,y=pos.y,z=pos.z+1}
+	elseif pos.z < 0 then
+		detect_walls["left"] = {x=pos.x+1,y=pos.y,z=pos.z}
+		detect_walls["right"] = {x=pos.x-1,y=pos.y,z=pos.z+1}
+	elseif pos.x < 0 then
+		detect_walls["left"] = {x=pos.x,y=pos.y,z=pos.z+1}
+		detect_walls["right"] = {x=pos.x,y=pos.y,z=pos.z-1}
+	elseif pos.z > 0 then
+		detect_walls["left"] = {x=pos.x+1,y=pos.y,z=pos.z}
+		detect_walls["right"] = {x=pos.x-1,y=pos.y,z=pos.z}
+	end		
+	print(facing_dir.x.." "..facing_dir.z)
+	--local near = minetest.find_node_near(pos, 1)
+	--Get the coordinates of the block directly in front fo me
+	if facing_dir.x < 0 then
+			near.x = near.x - 1
+	elseif facing_dir.x > 0 then
+			near.x = near.x + 1
+	elseif facing_dir.z < 0 then
+			near.z = near.z - 1
+	elseif facing_dir.z > 0 then
+			near.z = near.z + 1
+	end
+
+	--Identify the block in front of me
+	local block_front = minetest.get_node(near).name
+	local block_left = minetest.get_node(detect_walls["left"]).name
+	local block_right = minetest.get_node(detect_walls["right"]).name
+	if near then
+		-- Am I touching a wall? If so, I can't run.
+		local wall_front = vector.distance(pos, near)
+		local wall_left = vector.distance(pos,detect_walls["left"])
+		local wall_right = vector.distance(pos,detect_walls["right"])
+
+		--local wall_sides = 
+		if wall_front < too_close and block_front ~= "air" then
+			return true
+		elseif wall_left < too_close and block_left ~= "air" and wall_right < too_close and block_right ~= "air" then
+			return true
+		else
+			return false
+		end
+	end
+	return false
+end
+
 minetest.register_on_modchannel_message(function(channel_name, sender, message)
 	if channel_name == "mcl_sprint:" .. sender then
 		players[sender].clientSprint = minetest.is_yes(message)
@@ -160,8 +225,9 @@ minetest.register_globalstep(function(dtime)
 		local player = get_player_by_name(playerName)
 		if player then
 			local ctrl = player:get_player_control()
+			
 			--Check if the player should be sprinting
-			if players[playerName]["clientSprint"] or ctrl.aux1 and ctrl.up and not ctrl.sneak then
+			if players[playerName]["clientSprint"] or ctrl.aux1 and ctrl.up and not ctrl.sneak and not wall_collide(player:get_pos(),player) then
 				players[playerName]["shouldSprint"] = true
 			else
 				players[playerName]["shouldSprint"] = false