we *did* have a "simplify", toBaseUnits. Add simplify template

Author: Vindaar

src/unchained/units.nim

@@ -534,6 +534,9 @@ macro toBaseUnits*[T: SomeUnit](x: T): untyped =
   let resType = xCT.flatten().toBaseType(true).simplify(mergePrefixes = true).toNimType
   result = quote do:
     `x`.toDef(`resType`)
+template simplify*[T: SomeUnit](x: T): untyped =
+  ## Alias for `toBaseUnits`. Converts the given input to base SI units
+  toBaseUnits(x)
 
 ## Natural unit stuff
 proc toNaturalUnitImpl(t: UnitProduct): UnitProduct
@@ -594,13 +597,3 @@ macro toNaturalUnit*[T: SomeUnit](t: T): untyped =
   result = quote do:
     defUnit(`resType`)
     `resType`(`t`.FloatType * `scale`)
-
-macro simplify*[T: SomeUnit](t: T): untyped =
-  ## Returns the simplest form in SI base units of the given input.
-  var typ = t.parseDefinedUnit()
-  let resType = typ.flatten().simplify()
-  let scale = typ.toBaseTypeScale() / resType.toBaseTypeScale()
-  let resTypeNim = resType.toNimType()
-  result = quote do:
-    defUnit(`resTypeNim`)
-    `resTypeNim`(`t`.FloatType * `scale`)

tests/tunchained.nim

@@ -481,6 +481,7 @@ suite "Unchained - Conversion between units":
     let x = 1.kJ
     check typeof(x.simplify()) is kg•m²•s⁻²
     check x.simplify() == 1000.kg•m²•s⁻²
+    check x.toBaseUnits() == 1000.kg•m²•s⁻²
 
 suite "Unchained - CT errors":
   test "Error on regular digit as exponent":