local p = {}
--[[
main
This function returns parameter 1 as a warning if the page containing it is being previewed.
Usage:
{{#invoke:Preview warning|main|warning_text}}
]]
function p.main(frame)
local preview = frame.args[1]:match('^%s*(.-)%s*$') or ''
if preview == '' then preview = 'Something is wrong with this template' end
if frame:preprocess( "{{REVISIONID}}" ) == "" then return '<div class="hatnote" style="color:red"><strong>Warning:</strong> ' .. preview .. ' (this message is shown only in preview)</div>' end
end
return p
