fixed a lot of stuff

functions/addpaths.fish

@@ -1,5 +1,12 @@
 function addpaths
-    contains -- $argv $fish_user_paths
-       or set -U fish_user_paths $fish_user_paths $argv
+    if test (count $argv) -lt 1
+        echo "Usage: addpaths <path> [more paths...]"
+        return 1
+    end
+    for p in $argv
+        if not contains -- $p $fish_user_paths
+            fish_add_path -U $p
+        end
+    end
     echo "Updated PATH: $PATH"
 end