Changed . token to _dot

This change allows the dotfiles to work with chezmoi (e.g: on windows)
and improves grepability with neovim/telescope

dot_config/nushell/nu_scripts/modules/recursion/even-odd.nu

@@ -0,0 +1,30 @@
+# Mutually recursive versions of even and odd commands
+
+
+# even returns true if passed in 0. odd returns returns true if passed in 1
+# Else, they subtract 2 and call the other fn: even calls odd ($n - 2)
+#
+
+
+# These functions are meant to be used with the tramp module which implements
+# a trampoline  wrapper closure. Thus, for each even, odd command, the
+#  normal recursive case will actually return a thunk..
+
+# Return true if number is even. Calls mutually recursive odd function
+# if number is greater than 1.
+def even [n: int, acc=true] -> any {
+  if $n == 0 { return $acc } else if $n == 1 {
+    return (not $acc) } else {
+    {|| odd ($n - 2) (not $acc) }
+  }
+}
+
+
+# Returns true if number is odd. Will cooperate with even in a mutually recursive fashion.
+# Warning: do not pass any numbers less than 0
+def odd [n: int, acc=true] -> bool {
+  if $n == 0 { return (not $acc) } else if $n == 1 { 
+    return $acc } else {
+    {|| even ($n - 2) (not $acc) }
+  }
+}