Add justfile to build for correct out dir

fib.roc

@@ -15,7 +15,8 @@ main =
 
 fibWalk : List (Num a), Num a -> List (Num a)
 fibWalk = \l, n ->
-    next = when l is
+    next =
+        when l is
             [] | [_] -> fib n
             [.., a, b] -> a + b
     List.append l next

justfile

@@ -0,0 +1,13 @@
+set shell := ["nu", "-c"]
+
+default:
+	print "Select a command"
+
+dev target +FLAGS="": (build target FLAGS)
+	if ('out/{{target}}' | path exists) { out/{{target}} } else { ^$"out/('{{target}}' | str replace -r '\.roc$' '')" }
+
+build target +FLAGS="--optimize": init
+	roc build {{FLAGS}} ('{{target}}.roc' | str replace -r '\.roc\.roc$' '.roc') --output out/
+
+init:
+	mkdir out/

prime.roc

@@ -21,11 +21,13 @@ primeWalk = \l, n ->
     when n is
         Yes n2 ->
             List.append l n2
+
         Maybe n2 ->
             if isPrimePost l n2 then
                 List.append l n2
             else
                 l
+
         No _ -> l
 
 isPrimePre : U64 -> PrimeResult
@@ -41,7 +43,7 @@ isPrimePre = \n ->
 
 isPrimePost : List U64, U64 -> Bool
 isPrimePost = \l, n ->
-    nFloat = (Num.toF64 n)
+    nFloat = Num.toF64 n
     valLimit = Num.ceiling (Num.sqrt nFloat)
     # approximate the number of primes < sqrt(n) to limit the range we have to check with a 25% error tolerance
     valLimitF = Num.toF64 valLimit