jailbreakplusplus/gamemode/core/sv_spectator.lua

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JB.Gamemode.PlayerSpawnAsSpectator = function(gm,ply)
	ply:StripWeapons();

	if ( ply:Team() == TEAM_UNASSIGNED ) then

		ply:Spectate( OBS_MODE_FIXED )
		return

	end

	local canspec = {};
	for _,v in ipairs(team.GetPlayers(TEAM_GUARD))do
		if IsValid(v) and v:Alive() then
			table.insert(canspec,v);
		end
	end
	for _,v in ipairs(team.GetPlayers(TEAM_PRISONER))do
		if IsValid(v) and v:Alive() then
			table.insert(canspec,v);
		end
	end

	local target=(ply.spec and canspec[ply.spec]) or canspec[1];
	if target then
		ply:SpectateEntity(target);
		ply:Spectate( OBS_MODE_CHASE );
	else
		ply:Spectate( OBS_MODE_ROAMING );
	end
end;

local CTRL_NEXT = bit.bor(IN_ATTACK,IN_MOVELEFT,IN_FORWARD);
local CTRL_PREV = bit.bor(IN_ATTACK2,IN_MOVERIGHT,IN_BACK);
local CTRL_CHANGE = bit.bor(IN_DUCK);

hook.Add( "KeyPress", "JB.KeyPress.HandleSpectateControls", function(p,key)
	if p:GetObserverMode() ~= OBS_MODE_NONE then
		local doNext = tobool(bit.band(key,CTRL_NEXT));
		local doPrev = tobool(bit.band(key,CTRL_PREV));
		local doChange=tobool(bit.band(key,CTRL_CHANGE));
		
		if doNext or doPrev or doChange then

			JB:DebugPrint(p:Nick().. " is using spectator controls. "..tostring(doNext).." "..tostring(doPrev).." "..tostring(doChange));

			if not p.spec then p.spec = 1 end

			local canspec = {};
			for _,v in ipairs(team.GetPlayers(TEAM_GUARD))do
				if IsValid(v) and v:Alive() then
					table.insert(canspec,v);
				end
			end
			for _,v in ipairs(team.GetPlayers(TEAM_PRISONER))do
				if IsValid(v) and v:Alive() then
					table.insert(canspec,v);
				end
			end

			local target = (canspec[p.spec] or canspec[1]);
			if doChange and p:GetObserverMode() == OBS_MODE_CHASE then
				p:Spectate(OBS_MODE_ROAMING);
				return;
			elseif doChange and p:GetObserverMode() == OBS_MODE_ROAMING and target then
				p:Spectate(OBS_MODE_CHASE);
				p:SpectateEntity(target)
				return;
			elseif doChange then
				return
			end

			if p:GetObserverMode() == OBS_MODE_CHASE then
				local doNext=tobool(bit.band(key,CTRL_NEXT));
				local doPrev=tobool(bit.band(key,CTRL_PREV));

				if not canspec or not canspec[1] then
					JB.DebugPrint("Nobody alive to spectate.")
					return
				end

				local old=p.spec;
				if doNext then
					p.spec = p.spec+1;
					if p.spec > #canspec then
						p.spec = 0;
					end
				elseif doPrev then
					p.spec = p.spec-1;
					if p.spec < 1 then
						p.spec = #canspec;
					end
				end

				target = canspec[p.spec];
				if IsValid(target) then
					p:SpectateEntity(target);
				end
			end
		end
	end
end)