1 files changed, 27 insertions, 1 deletions
diff --git a/root/nix/apps.nix b/root/nix/apps.nix
index 7421234..e5d619e 100644
--- a/root/nix/apps.nix
+++ b/root/nix/apps.nix
@@ -1,6 +1,11 @@
 {
   perSystem =
-    { pkgs, ... }:
+    {
+      config,
+      lib,
+      pkgs,
+      ...
+    }:
     {
       apps.checks = {
         type = "app";
@@ -13,5 +18,26 @@
         );
         meta.description = "run all the nix checks in parallel";
       };
+
+      apps.lint =
+        let
+          devshells = builtins.filter (n: n != "common") (builtins.attrNames config.devShells);
+          mkTreefmtCommand = name: "nix develop .#${name} --command treefmt";
+          quotedCommands = lib.strings.concatMapStringsSep " " (
+            n: lib.escapeShellArg (mkTreefmtCommand n)
+          ) devshells;
+        in
+        {
+          type = "app";
+          program = toString (
+            pkgs.writeShellScript "treefmt" ''
+              set -xeuo pipefail
+
+              ${pkgs.parallel}/bin/parallel -j5 -k ::: ${quotedCommands}
+            ''
+          );
+          meta.description = "run treefmt from all the projects in parallel";
+        };
+
     };
 }