if not modules then modules = { } end modules ['util-fmt'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

utilities            = utilities or { }
utilities.formatters = utilities.formatters or { }
local formatters     = utilities.formatters

local concat, format = table.concat, string.format
local tostring, type = tostring, type
local strip = string.strip

local P, R, Cs = lpeg.P, lpeg.R, lpeg.Cs
local lpegmatch = lpeg.match

-- temporary here

local digit         = R("09")
local period        = P(".")
local zero          = P("0")
local trailingzeros = zero^0 * -digit -- suggested by Roberto R
local case_1        = period * trailingzeros / ""
local case_2        = period * (digit - trailingzeros)^1 * (trailingzeros / "")
local number        = digit^1 * (case_1 + case_2)
local stripper      = Cs((number + 1)^0)

--~ local sample = "bla 11.00 bla 11 bla 0.1100 bla 1.00100 bla 0.00 bla 0.001 bla 1.1100 bla 0.100100100 bla 0.00100100100"
--~ collectgarbage("collect")
--~ str = string.rep(sample,10000)
--~ local ts = os.clock()
--~ lpegmatch(stripper,str)
--~ print(#str, os.clock()-ts, lpegmatch(stripper,sample))

lpeg.patterns.stripzeros = stripper

function formatters.stripzeros(str)
    return lpegmatch(stripper,str)
end

function formatters.formatcolumns(result,between)
    if result and #result > 0 then
        between = between or "   "
        local widths, numbers = { }, { }
        local first = result[1]
        local n = #first
        for i=1,n do
            widths[i] = 0
        end
        for i=1,#result do
            local r = result[i]
            for j=1,n do
                local rj = r[j]
                local tj = type(rj)
                if tj == "number" then
                    numbers[j] = true
                end
                if tj ~= "string" then
                    rj = tostring(rj)
                    r[j] = rj
                end
                local w = #rj
                if w > widths[j] then
                    widths[j] = w
                end
            end
        end
        for i=1,n do
            local w = widths[i]
            if numbers[i] then
                if w > 80 then
                    widths[i] = "%s" .. between
                 else
                    widths[i] = "%0" .. w .. "i" .. between
                end
            else
                if w > 80 then
                    widths[i] = "%s" .. between
                 elseif w > 0 then
                    widths[i] = "%-" .. w .. "s" .. between
                else
                    widths[i] = "%s"
                end
            end
        end
        local template = strip(concat(widths))
        for i=1,#result do
            local str = format(template,unpack(result[i]))
            result[i] = strip(str)
        end
    end
    return result
end