Merge branch 'master' into cabal2nix

Author: sinrohit

modules/hook.nix

@@ -184,12 +184,31 @@ in
         '';
       default = [ ];
     };
+
+    before = mkOption {
+      type = types.listOf types.str;
+      description =
+        ''
+          List of hooks that should run after this hook.
+        '';
+      default = [ ];
+    };
+
+    after = mkOption {
+      type = types.listOf types.str;
+      description =
+        ''
+          List of hooks that should run before this hook.
+        '';
+      default = [ ];
+    };
+
   };
 
   config = {
     raw =
       {
-        inherit (config) name entry language files types types_or exclude_types pass_filenames fail_fast require_serial stages verbose always_run args;
+        inherit (config) name entry language files types types_or exclude_types pass_filenames fail_fast require_serial stages verbose always_run args before after;
         id = config.name;
         exclude = mergeExcludes config.excludes;
       };

modules/pre-commit.nix

@@ -30,7 +30,21 @@ let
   enabledHooks = filterAttrs (id: value: value.enable) cfg.hooks;
   enabledExtraPackages = builtins.concatLists (mapAttrsToList (_: value: value.extraPackages) enabledHooks);
   processedHooks =
-    mapAttrsToList (id: value: value.raw // { inherit id; }) enabledHooks;
+    let
+      sortedHooks = lib.toposort
+        (a: b: builtins.elem b.id a.before || builtins.elem a.id b.after)
+        (mapAttrsToList
+          (id: value:
+            value.raw // {
+              inherit id;
+              before = value.raw.before;
+              after = value.raw.after;
+            }
+          )
+          enabledHooks
+        );
+    in
+    sortedHooks.result;
 
   configFile =
     performAssertions (