Module:Unsigned

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This module implements {{unsigned}}. It has a few functions:

• main called by {{unsigned}}; not intended for broader use
• getTimestamp find a timestamp from a string. If only a date is found, it returns the date. If only a time is found, it returns the empty string. If a time and a date are both found, it appends (UTC).
• getUsername gets the username from a string containing a timestamp. It currently assumes that everything besides a timestamp is part of the username.

The above documentation is transcluded from Module:Unsigned/doc. (edit | history)
Editors can experiment in this module's sandbox (edit | diff) and testcases (create) pages.
Subpages of this module.

local p = {}

-- There's probably a way to use strptime or some other more sophisticated way, but you're not supposed to be using a non-timestamp as input anyway.

local function endswith(String,End)
	return End == '' or string.sub(String,-string.len(End)) == End
end

local function trim(s)
	return s:gsub("^%s+", ""):gsub("%s+$", ""):gsub("\226\128\142", "")
end

local function addUtcToStringIfItDoesNotEndWithUtc(s)
	if s == "" or endswith(s, "~~~~") then return s end
	if not endswith(s, "(UTC)") then
		return s .. " (UTC)"
	end
	return s
end

function p.main(frame)
	local hopefullyTimestamp = frame.args[1] or os.date('%H:%M, %d %B %Y (%Z)')
	return addUtcToStringIfItDoesNotEndWithUtc(trim(hopefullyTimestamp))
end

return p