Module:Outdent

local p = {}
local getArgs = require('Module:Arguments').getArgs

function p.outdent (frame) 
 local args = getArgs(frame)
 local width = 0
 
 local reversed = args['reverse'] or args['indent'] or args['r'] or args['in'] -- aliases for reverse
 if not args[1] then args[1] = '' end                                        -- un-nil args[1]
 
 width = width + select(2, string.gsub(args[1],':',''))      -- increase by 1 for every :
 width = width + select(2, string.gsub(args[1],'*',''))      -- increase by 1 for every *
 width = width + select(2, string.gsub(args[1],'#','')) * 2     -- increase by 2 for every #
 
 if width == 0 then width = tonumber(args[1]) end       -- set width to args[1] if needed

 if not width then width = 10 end           -- default width
 if width < 0
 then
  width = -width
  reversed = not reversed
 end
 if width > 40 then width = 40 end           -- max width
 
 width = width * 1.6               -- set width to proper width
 
 local top = '<span style="display:block;width:' .. width .. 'em;height:0.5em;' .. (width == 0 and '' or 'border-bottom:1px solid #a2a9b1;') .. 'border-' .. ((width == 0 or reversed) and 'left' or 'right') ..':1px solid #a2a9b1;"></span>' -- top half
 local bottom = '<span style="display:block;width:' .. width .. 'em;height:0.5em;border-' .. (reversed and 'right' or 'left') .. ':1px solid #a2a9b1;"></span>' -- bottom half
 local note = args[2] and '<span>([[Wikipedia:Indentation#Outdenting|outdent]])&#32;</span>' or '' -- note
 
 return '<div class="outdent-template" style="position:relative;left:1px;">' .. top .. bottom .. note .. '</div>';
end

return p