add files

LICENSE

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+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.
+

README

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+This mod allows you to watch other players in their 3rd person view (spectator mode).
+You're invisible and undetectable for the players when you're in this mode.
+
+Can be useful for admins or moderators in their task of monitoring.
+
+Requires the privilege "watch".
+
+Commands :
+
+/watch <player name>
+/unwatch (get back to your initial position)
+

init.lua

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+local original_pos = {}
+
+minetest.register_privilege("watch", "Player can watch other players")
+
+minetest.register_chatcommand("watch", {
+	params = "<to_name>",
+	description = "watch a given player",
+	privs = {watch=true},
+	func = function(name, param)
+		local watcher, watched = nil, nil
+		watcher = minetest.get_player_by_name(name)
+		watched = param:match("^([^ ]+)$")
+		local watched_player_name = minetest.get_player_by_name(watched)
+		original_pos[watcher] = watcher:getpos()
+
+		if watched and watched_player_name and watcher and
+				default.player_attached[name] == false then
+
+			default.player_attached[name] = true
+			watcher:set_attach(watched_player_name, "", {x=0, y=10, z=-20}, {x=0, y=0, z=0})
+			watcher:set_eye_offset({x=0, y=10, z=-20},{x=0, y=0, z=0})
+			watcher:set_nametag_attributes({color = {a=0, r=0, g=0, b=0}})
+
+			watcher:hud_set_flags({
+				hotbar = false, healthbar = false,
+				crosshair = false, wielditem = false
+			})
+
+			watcher:set_properties({
+				visual_size = {x=0, y=0},
+				makes_footstep_sound = false,
+				collisionbox = {0, 0, 0, 0, 0, 0}
+			})
+
+			return true, "Watching '"..watched.."' at "..minetest.pos_to_string(vector.round(watched_player_name:getpos())).."..."
+		end
+
+		return false, "Invalid parameters ('"..param.."'), or player not found, or you're already watching a player."
+	end
+})
+
+minetest.register_chatcommand("unwatch", {
+	description = "unwatch a player",
+	privs = {watch=true},
+	func = function(name, param)
+		local watcher = nil
+		watcher = minetest.get_player_by_name(name)
+
+		if watcher and default.player_attached[name] == true then
+			watcher:set_detach()
+			default.player_attached[name] = false
+			watcher:set_eye_offset({x=0, y=0, z=0},{x=0, y=0, z=0})
+			watcher:set_nametag_attributes({color = {a=255, r=255, g=255, b=255}})
+
+			watcher:hud_set_flags({
+				hotbar = true, healthbar = true,
+				crosshair = true, wielditem = true
+			})
+
+			watcher:set_properties({
+				visual_size = {x=1, y=1},
+				makes_footstep_sound = true,
+				collisionbox = {-0.3, -1, -0.3, 0.3, 1, 0.3}
+			})
+
+			minetest.after(0.1, function()
+				watcher:setpos(original_pos[watcher])
+			end)
+
+			minetest.after(0.2, function()
+				original_pos[watcher] = {}
+			end)
+
+		end
+
+		return false, "You're not watching a player currently."
+	end
+})
+