gistfile1.lua

local function GetValidChannel(num)
	local i = 0
	while true do
		i = i + 1
		if i > 10 then return end
		num = num + 1
		if num > 10 then
			num = 1
		end
		if select(2, GetChannelName(i)) then
			return num
		end
	end
end

function ChatEdit_OnTabPressed(self)
	local chatType = self:GetAttribute('chatType')
	local channelTarget = self:GetAttribute('channelTarget')
	local inBG = UnitInBattleground('player') and true
	local inRaid = GetRealNumRaidMembers() > 0 and true
	local inParty = GetRealNumPartyMembers() > 0 and true
	local inGuild = IsInGuild() and true
	local setType
	
	if chatType == 'CHANNEL' then
		local channelNum = GetValidChannel(channelTarget)
		if channelNum then
			setType = chatType
			self:SetAttribute('channelTarget', channelNum)
		end
	else
		if chatType == 'SAY' then
			setType = inBG and 'BATTLEGROUND' or inRaid and 'RAID' or inParty and 'PARTY' or inGuild and 'GUILD' or 'SAY'
		elseif chatType == 'BATTLEGROUND' then
			setType = inRaid and 'RAID' or inParty and 'PARTY' or inGuild and 'GUILD' or 'SAY'
		elseif chatType == 'RAID' then
			setType = inParty and 'PARTY' or inGuild and 'GUILD' or 'SAY'
		elseif chatType == 'PARTY' then
			setType = inGuild and 'GUILD' or 'SAY'
		elseif chatType == 'GUILD' then
			setType = 'OFFICER'
		elseif chatType == 'OFFICER' then
			setType = 'SAY'
		end
	end
	
	if setType then
		self:SetAttribute('chatType', setType)
		ChatEdit_UpdateHeader(self)
	else
		ChatEdit_SecureTabPressed(self)
	end
end