geany-plugin-sort.lua
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	function split(str, pat)
	local t = {} -- NOTE: use {n = 0} in Lua-5.0
	local fpat = "(.-)" .. pat
	local last_end = 1
	local s, e, cap = str:find(fpat, 1)
	while s do
	if s ~= 1 or cap ~= "" then
	table.insert(t,cap)
	end
	last_end = e+1
	s, e, cap = str:find(fpat, last_end)
	end
	if last_end <= #str then
	cap = str:sub(last_end)
	table.insert(t, cap)
	end
	return t
	end

	geany.select(0, geany.length())
	local text = geany.selection()
	local lines = split(text, " ")
	table.sort(lines)
	local output = table.concat(lines, "\n")
	geany.selection(output)