Merge plugin back into main repository (#49)

plugin/src/Version.lua

@@ -0,0 +1,40 @@
+local function compare(a, b)
+	if a > b then
+		return 1
+	elseif a < b then
+		return -1
+	end
+
+	return 0
+end
+
+local Version = {}
+
+--[[
+	Compares two versions of the form {major, minor, revision}.
+
+	If a is newer than b, 1.
+	If a is older than b, -1.
+	If a and b are the same, 0.
+]]
+function Version.compare(a, b)
+	local major = compare(a[1], b[1])
+	local minor = compare(a[2] or 0, b[2] or 0)
+	local revision = compare(a[3] or 0, b[3] or 0)
+
+	if major ~= 0 then
+		return major
+	end
+
+	if minor ~= 0 then
+		return minor
+	end
+
+	return revision
+end
+
+function Version.display(version)
+	return table.concat(version, ".")
+end
+
+return Version