CC: Cannon mail [Client] - util.lua

-- util.lua

function tcontains(t,element)
    for _,value in pairs(t) do
        if element == value then
            return true
        end
    end
    return false
end

function wordwrap(str, callback, maxLength, maxRows)
    if type(callback) == "table" then
        local t = callback
        callback = function(row) table.insert(t, row) end
    end

    local rows = 0
    while #str > 1 do
        if type(maxRows) == "number"
        and rows >= maxRows and (#str + 3 > maxLength) then
            callback(str:sub(1,maxLength-3) .. "...")
            return str
        else
            local pre = ""
            pre, str = smartSplit(str, maxLength)
            callback(pre)
            rows = rows + 1
        end
    end

    return nil
end

-- split a string at a space if possible
function smartSplit(str, maxLength)
    if #str < maxLength then
        return str, ""
    end

    local pre = str:sub(1,maxLength)
    local post = str:sub(maxLength+1,-1)

    -- check from first to last
    for index = 1,math.min(#str,maxLength) do
        local char = str:sub(index,index)

        if char == "\n" then
            pre = str:sub(1,index-1)
            post = str:sub(index+1,-1)
            return pre, post
        end
    end

    -- check from last to first, i.e. backwards
    for index = math.min(#str,maxLength),1,-1 do
        local char = str:sub(index,index)

        if char == " " and index > 3 then
            pre = str:sub(1,index-1)
            post = str:sub(index+1,-1)
            return pre, post
        end
    end

    return pre, post
end

function log(x,base)
    return math.log(x) / math.log(base)
end

function colorToHex(color)
    return string.format("%x", log(color, 2))
end

-- eof