perf: Replaced fd with custom internals.

f.nu

@@ -0,0 +1,27 @@
+#!/usr/bin/env nu
+
+def main [] {
+  let all = (fd -HI -a .env . ~/ | lines | sort)
+  let unignored = (fd -H -a .env ~/ | lines | sort)  
+
+  $all | filter { |it| not ($it in $unignored) } | str join "\n"
+  # sorted_list_intersect $all $unignored | str join "\n"
+}
+
+def sorted_list_intersect [xs1: list, xs2: list] {
+  let len1 = ($xs1 | length)
+  let len2 = ($xs2 | length)
+  mut i = 0
+  mut j = 0
+  while ($i < $len1 and $j < $len2) {
+    if ($xs1 | get $i) < ($xs2 | get $j) {
+      $i = $i + 1
+    } else if ($xs2 | get $j) < ($xs1 | get $i) {
+      $j = $j + 1
+    } else {
+      echo ($xs2 | get $j)
+      $i = $i + 1
+      $j = $j + 1
+    }
+  }
+}