explicitly define project root in treefmt (#103)

* explicitly define project root in treefmt

* define `projectRootFile` in `treefmt`

* make `treefmt.projectRoot` as `inputs.services-flake`

* use github flake url

* flake.nix as projectRootFile

* add comment

* force override-input in test flake

---------

Co-authored-by: shivaraj-bh <sbh69840@gmail.com>

dev/flake.lock

@@ -88,9 +88,25 @@
         "flake-parts": "flake-parts",
         "flake-root": "flake-root",
         "nixpkgs": "nixpkgs",
+        "services-flake": "services-flake",
         "treefmt-nix": "treefmt-nix"
       }
     },
+    "services-flake": {
+      "locked": {
+        "lastModified": 1708321363,
+        "narHash": "sha256-8tyA4VIUrbYJaF/eOnx5fzvw3jSskQ622XPUqSoAEGU=",
+        "owner": "juspay",
+        "repo": "services-flake",
+        "rev": "29781d10d08ab704dacf58cad35cddac7d19d5bd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "juspay",
+        "repo": "services-flake",
+        "type": "github"
+      }
+    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": "nixpkgs_2"

dev/flake.nix

@@ -4,6 +4,8 @@
     flake-parts.url = "github:hercules-ci/flake-parts";
     flake-root.url = "github:srid/flake-root";
     treefmt-nix.url = "github:numtide/treefmt-nix";
+    # CI will override `services-flake` to run checks on the latest source
+    services-flake.url = "github:juspay/services-flake";
   };
   outputs = inputs@{ self, nixpkgs, flake-parts, ... }:
     flake-parts.lib.mkFlake { inherit inputs; } {
@@ -14,6 +16,7 @@
       ];
       perSystem = { pkgs, lib, config, ... }: {
         treefmt = {
+          projectRoot = inputs.services-flake;
           projectRootFile = "flake.nix";
           programs = {
             nixpkgs-fmt.enable = true;

flake.nix

@@ -21,6 +21,7 @@
         dir = "./test";
       };
       dev = {
+        inherit overrideInputs;
         dir = "./dev";
       };
       doc = {

test/flake.nix

@@ -4,7 +4,7 @@
     flake-parts.url = "github:hercules-ci/flake-parts";
     systems.url = "github:nix-systems/default";
     process-compose-flake.url = "github:Platonic-Systems/process-compose-flake";
-    services-flake.url = "github:juspay/services-flake";
+    services-flake = { };
   };
   outputs = inputs:
     inputs.flake-parts.lib.mkFlake { inherit inputs; } {