refactor(readTree): Flip argument order of argFilter

Since the filters return 'args', this makes nesting of filters more
readable.

Change-Id: I775252460e3e077cc6db2fab6f3948414a95ecbf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3873
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

default.nix

@@ -20,7 +20,7 @@ let
   # Create a readTree filter disallowing access to the specified
   # top-level folder in other parts of the depot, except for specific
   # exceptions specified by their (full) paths.
-  restrictFolder = { folder, exceptions ? [], reason }: args: parts:
+  restrictFolder = { folder, exceptions ? [], reason }: parts: args:
     if (elemAt parts 0) == folder || elem parts exceptions
     then args
     else args // {

nix/readTree/default.nix

@@ -64,7 +64,7 @@ let
   in
     if pathType != "lambda"
     then builtins.throw "readTree: trying to import ${toString path}, but it’s a ${pathType}, you need to make it a function like { depot, pkgs, ... }"
-    else importedFile (filter (argsWithPath args parts) parts);
+    else importedFile (filter parts (argsWithPath args parts));
 
   nixFileName = file:
     let res = match "(.*)\\.nix" file;
@@ -129,7 +129,7 @@ in {
   __functor = _:
     { path
     , args
-    , filter ? (x: _parts: x)
+    , filter ? (_parts: x: x)
     , scopedArgs ? {} }:
       readTree {
         inherit args scopedArgs;