diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index c77a1e939..23f7f8568 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -203,18 +203,18 @@ from the available ones of the following files:
 Examples of sound parameter tables:
 -- Play locationless on all clients
 {
-	gain = 1.0, -- default
+    gain = 1.0, -- default
 }
 -- Play locationless to a player
 {
-	to_player = name,
-	gain = 1.0, -- default
+    to_player = name,
+    gain = 1.0, -- default
 }
 -- Play in a location
 {
-	pos = {x=1,y=2,z=3},
-	gain = 1.0, -- default
-	max_hear_distance = 32, -- default
+    pos = {x=1,y=2,z=3},
+    gain = 1.0, -- default
+    max_hear_distance = 32, -- default
 }
 -- Play connected to an object, looped
 {
@@ -266,11 +266,11 @@ local drawtype = get_nodedef_field(nodename, "drawtype")
 Example: minetest.get_item_group(name, group) has been implemented as:
 
 function minetest.get_item_group(name, group)
-	if not minetest.registered_items[name] or not
-			minetest.registered_items[name].groups[group] then
-		return 0
-	end
-	return minetest.registered_items[name].groups[group]
+    if not minetest.registered_items[name] or not
+            minetest.registered_items[name].groups[group] then
+        return 0
+    end
+    return minetest.registered_items[name].groups[group]
 end
 
 Nodes
@@ -491,7 +491,7 @@ An example: Make meat soup from any meat, any water and any bowl
 }
 An another example: Make red wool from white wool and red dye
 {
-	type = 'shapeless',
+    type = 'shapeless',
     output = 'wool:red',
     recipe = {'wool:white', 'group:dye,basecolor_red'},
 }
@@ -502,7 +502,7 @@ Special groups
 - level: Can be used to give an additional sense of progression in the game.
   - A larger level will cause eg. a weapon of a lower level make much less
     damage, and get weared out much faster, or not be able to get drops
-	from destroyed nodes.
+    from destroyed nodes.
   - 0 is something that is directly accessible at the start of gameplay
   - There is no upper limit
 - dig_immediate: (player can always pick up node without tool wear)
@@ -609,11 +609,11 @@ maximum level.
 Example definition of the capabilities of a tool
 -------------------------------------------------
 tool_capabilities = {
-	full_punch_interval=1.5,
-	max_drop_level=1,
-	groupcaps={
-		crumbly={maxlevel=2, uses=20, times={[1]=1.60, [2]=1.20, [3]=0.80}}
-	}
+    full_punch_interval=1.5,
+    max_drop_level=1,
+    groupcaps={
+        crumbly={maxlevel=2, uses=20, times={[1]=1.60, [2]=1.20, [3]=0.80}}
+    }
 }
 
 This makes the tool be able to dig nodes that fullfill both of these:
@@ -773,7 +773,7 @@ field[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]
 ^ default is the default value of the field
   ^ default may contain variable references such as '${text}' which
     will fill the value from the metadata value 'text'
-	^ Note: no extra text or more than a single variable is supported ATM.
+    ^ Note: no extra text or more than a single variable is supported ATM.
 
 field[<name>;<label>;<default>]
 ^ as above but without position/size units
@@ -1050,7 +1050,7 @@ minetest.unban_player_or_ip(name) -> unban player or IP address
 
 Particles:
 minetest.add_particle(pos, velocity, acceleration, expirationtime,
-	size, collisiondetection, texture, playername)
+    size, collisiondetection, texture, playername)
 ^ Spawn particle at pos with velocity and acceleration
 ^ Disappears after expirationtime seconds
 ^ collisiondetection: if true collides with physical objects
@@ -1058,12 +1058,12 @@ minetest.add_particle(pos, velocity, acceleration, expirationtime,
 ^ Playername is optional, if specified spawns particle only on the player's client
 
 minetest.add_particlespawner(amount, time,
-	minpos, maxpos,
-	minvel, maxvel,
-	minacc, maxacc,
-	minexptime, maxexptime,
-	minsize, maxsize,
-	collisiondetection, texture, playername)
+    minpos, maxpos,
+    minvel, maxvel,
+    minacc, maxacc,
+    minexptime, maxexptime,
+    minsize, maxsize,
+    collisiondetection, texture, playername)
 ^ Add a particlespawner, an object that spawns an amount of particles over time seconds
 ^ The particle's properties are random values in between the boundings:
 ^ minpos/maxpos, minvel/maxvel (velocity), minacc/maxacc (acceleration),
@@ -1323,10 +1323,10 @@ Player-only: (no-op for other objects)
   ^ Should usually be called in on_joinplayer
 - get_inventory_formspec() -> formspec string
 - get_player_control(): returns table with player pressed keys
-	{jump=bool,right=bool,left=bool,LMB=bool,RMB=bool,sneak=bool,aux1=bool,down=bool,up=bool}
+    {jump=bool,right=bool,left=bool,LMB=bool,RMB=bool,sneak=bool,aux1=bool,down=bool,up=bool}
 - get_player_control_bits(): returns integer with bit packed player pressed keys
-	bit nr/meaning: 0/up ,1/down ,2/left ,3/right ,4/jump ,5/aux1 ,6/sneak ,7/LMB ,8/RMB
-	
+    bit nr/meaning: 0/up ,1/down ,2/left ,3/right ,4/jump ,5/aux1 ,6/sneak ,7/LMB ,8/RMB
+    
 InvRef: Reference to an inventory
 methods:
 - is_empty(listname): return true if list is empty
@@ -1411,8 +1411,8 @@ Registered entities
     ^ puncher: ObjectRef (can be nil)
     ^ time_from_last_punch: Meant for disallowing spamming of clicks (can be nil)
     ^ tool_capabilities: capability table of used tool (can be nil)
-	^ dir: unit vector of direction of punch. Always defined. Points from
-	       the puncher to the punched.
+    ^ dir: unit vector of direction of punch. Always defined. Points from
+           the puncher to the punched.
   - on_rightclick(self, clicker)
   - get_staticdata(self)
     ^ Should return a string that will be passed to on_activate when
@@ -1533,10 +1533,10 @@ Node definition (register_node)
     drawtype = "normal", -- See "Node drawtypes"
     visual_scale = 1.0,
     tiles = {tile definition 1, def2, def3, def4, def5, def6},
-	^ Textures of node; +Y, -Y, +X, -X, +Z, -Z (old field name: tile_images)
+    ^ Textures of node; +Y, -Y, +X, -X, +Z, -Z (old field name: tile_images)
     ^ List can be shortened to needed length
     special_tiles = {tile definition 1, Tile definition 2},
-	^ Special textures of node; used rarely (old field name: special_materials)
+    ^ Special textures of node; used rarely (old field name: special_materials)
     ^ List can be shortened to needed length
     alpha = 255,
     post_effect_color = {a=0, r=0, g=0, b=0}, -- If player is inside node
@@ -1592,7 +1592,7 @@ Node definition (register_node)
     can_dig = function(pos,player)
     ^ returns true if node can be dug, or false if not
     ^ default: nil
-	
+    
     on_punch = func(pos, node, puncher),
     ^ default: minetest.node_punch
     ^ By default: does nothing
@@ -1615,32 +1615,32 @@ Node definition (register_node)
     ^ Called when an UI form (eg. sign text input) returns data
     ^ default: nil
 
-	allow_metadata_inventory_move = func(pos, from_list, from_index,
-			to_list, to_index, count, player),
-	^ Called when a player wants to move items inside the inventory
-	^ Return value: number of items allowed to move
-	
-	allow_metadata_inventory_put = func(pos, listname, index, stack, player),
-	^ Called when a player wants to put something into the inventory
-	^ Return value: number of items allowed to put
-	^ Return value: -1: Allow and don't modify item count in inventory
-  
-	allow_metadata_inventory_take = func(pos, listname, index, stack, player),
-	^ Called when a player wants to take something out of the inventory
-	^ Return value: number of items allowed to take
-	^ Return value: -1: Allow and don't modify item count in inventory
-
-	on_metadata_inventory_move = func(pos, from_list, from_index,
-			to_list, to_index, count, player),
-	on_metadata_inventory_put = func(pos, listname, index, stack, player),
-	on_metadata_inventory_take = func(pos, listname, index, stack, player),
-	^ Called after the actual action has happened, according to what was allowed.
-	^ No return value
+    allow_metadata_inventory_move = func(pos, from_list, from_index,
+            to_list, to_index, count, player),
+    ^ Called when a player wants to move items inside the inventory
+    ^ Return value: number of items allowed to move
     
-	on_blast = func(pos, intensity),
-	^ intensity: 1.0 = mid range of regular TNT
-	^ If defined, called when an explosion touches the node, instead of
-	  removing the node
+    allow_metadata_inventory_put = func(pos, listname, index, stack, player),
+    ^ Called when a player wants to put something into the inventory
+    ^ Return value: number of items allowed to put
+    ^ Return value: -1: Allow and don't modify item count in inventory
+  
+    allow_metadata_inventory_take = func(pos, listname, index, stack, player),
+    ^ Called when a player wants to take something out of the inventory
+    ^ Return value: number of items allowed to take
+    ^ Return value: -1: Allow and don't modify item count in inventory
+
+    on_metadata_inventory_move = func(pos, from_list, from_index,
+            to_list, to_index, count, player),
+    on_metadata_inventory_put = func(pos, listname, index, stack, player),
+    on_metadata_inventory_take = func(pos, listname, index, stack, player),
+    ^ Called after the actual action has happened, according to what was allowed.
+    ^ No return value
+    
+    on_blast = func(pos, intensity),
+    ^ intensity: 1.0 = mid range of regular TNT
+    ^ If defined, called when an explosion touches the node, instead of
+      removing the node
 }
 
 Recipe for register_craft: (shaped)
@@ -1695,19 +1695,19 @@ Ore definition (register_ore)
     ore = "default:stone_with_coal",
     wherein = "default:stone",
     clust_scarcity = 8*8*8,
-        ^ Ore has a 1 out of clust_scarcity chance of spawning in a node
+    ^ Ore has a 1 out of clust_scarcity chance of spawning in a node
     ^ This value should be *MUCH* higher than your intuition might tell you!
     clust_num_ores = 8,
-        ^ Number of ores in a cluster
+    ^ Number of ores in a cluster
     clust_size = 3,
-        ^ Size of the bounding box of the cluster
+    ^ Size of the bounding box of the cluster
     ^ In this example, there is a 3x3x3 cluster where 8 out of the 27 nodes are coal ore
     height_min = -31000,
     height_max = 64,
     noise_threshhold = 0.5,
-        ^ If noise is above this threshhold, ore is placed.  Not needed for a uniform distribution
+    ^ If noise is above this threshhold, ore is placed.  Not needed for a uniform distribution
     noise_params = {offset=0, scale=1, spread={x=100, y=100, z=100}, seed=23, octaves=3, persist=0.70}
-        ^ NoiseParams structure describing the perlin noise used for ore distribution.
+    ^ NoiseParams structure describing the perlin noise used for ore distribution.
     ^ Needed for sheet ore_type.  Omit from scatter ore_type for a uniform ore distribution
 }
 
@@ -1721,24 +1721,24 @@ Chatcommand definition (register_chatcommand)
 
 Detached inventory callbacks
 {
-	allow_move = func(inv, from_list, from_index, to_list, to_index, count, player),
+    allow_move = func(inv, from_list, from_index, to_list, to_index, count, player),
     ^ Called when a player wants to move items inside the inventory
-	^ Return value: number of items allowed to move
-	
+    ^ Return value: number of items allowed to move
+    
     allow_put = func(inv, listname, index, stack, player),
     ^ Called when a player wants to put something into the inventory
-	^ Return value: number of items allowed to put
-	^ Return value: -1: Allow and don't modify item count in inventory
+    ^ Return value: number of items allowed to put
+    ^ Return value: -1: Allow and don't modify item count in inventory
    
     allow_take = func(inv, listname, index, stack, player),
     ^ Called when a player wants to take something out of the inventory
-	^ Return value: number of items allowed to take
-	^ Return value: -1: Allow and don't modify item count in inventory
-	
-	on_move = func(inv, from_list, from_index, to_list, to_index, count, player),
+    ^ Return value: number of items allowed to take
+    ^ Return value: -1: Allow and don't modify item count in inventory
+    
+    on_move = func(inv, from_list, from_index, to_list, to_index, count, player),
     on_put = func(inv, listname, index, stack, player),
     on_take = func(inv, listname, index, stack, player),
-	^ Called after the actual action has happened, according to what was allowed.
-	^ No return value
+    ^ Called after the actual action has happened, according to what was allowed.
+    ^ No return value
 }