treewide: back to flake parts (#539)

* treewide: back to flake parts

* treewide: drop extra docs

these are kind pointless

3 files changed, 127 insertions, 0 deletions

diff --git a/flake/ci.nix b/flake/ci.nix
new file mode 100644
index 0000000..cd1857f
--- /dev/null
+++ b/flake/ci.nix
@@ -0,0 +1,72 @@
+{
+  lib,
+  withSystem,
+  self,
+  ...
+}:
+
+{
+  perSystem =
+    { pkgs, ... }:
+    {
+      quickChecks = {
+        actionlint = {
+          dependencies = [ pkgs.actionlint ];
+          script = "actionlint ${self}/.github/workflows/**";
+        };
+
+        deadnix = {
+          dependencies = [ pkgs.deadnix ];
+          script = "deadnix --fail ${self}";
+        };
+
+        just = {
+          dependencies = [ pkgs.just ];
+          script = ''
+            cd ${self}
+            just --check --fmt --unstable
+            just --summary
+          '';
+        };
+
+        nixfmt = {
+          dependencies = [ pkgs.nixfmt-rfc-style ];
+          script = "nixfmt --check ${self}/**/*.nix";
+        };
+
+        statix = {
+          dependencies = [ pkgs.statix ];
+          script = "statix check ${self}";
+        };
+      };
+    };
+
+  flake = {
+    hydraJobs =
+
+      let
+        # Architecture of "main" CI machine
+        ciSystem = "x86_64-linux";
+
+        derivFromCfg = deriv: deriv.config.system.build.toplevel or deriv.activationPackage;
+        mapCfgsToDerivs = lib.mapAttrs (lib.const derivFromCfg);
+      in
+
+      withSystem ciSystem (
+        { pkgs, self', ... }:
+
+        {
+          # I don't care to run these for each system, as they should be the same
+          # and don't need to be cached
+          inherit (self') checks devShells;
+
+          darwinConfigurations = mapCfgsToDerivs self.darwinConfigurations;
+          homeConfigurations = mapCfgsToDerivs self.homeConfigurations;
+          nixosConfigurations = mapCfgsToDerivs self.nixosConfigurations // {
+            # please add aarch64 runners github...please...
+            atlas = lib.deepSeq (derivFromCfg self.nixosConfigurations.atlas).drvPath pkgs.emptyFile;
+          };
+        }
+      );
+  };
+}
diff --git a/flake/default.nix b/flake/default.nix
new file mode 100644
index 0000000..ba160ff
--- /dev/null
+++ b/flake/default.nix
@@ -0,0 +1,13 @@
+{
+  imports = [
+    ./ci.nix
+    ./dev-shell.nix
+  ];
+
+  perSystem =
+    { pkgs, ... }:
+
+    {
+      formatter = pkgs.nixfmt-rfc-style;
+    };
+}
diff --git a/flake/dev-shell.nix b/flake/dev-shell.nix
new file mode 100644
index 0000000..46e6ed0
--- /dev/null
+++ b/flake/dev-shell.nix
@@ -0,0 +1,42 @@
+{
+  perSystem =
+    {
+      lib,
+      pkgs,
+      inputs',
+      self',
+      ...
+    }:
+
+    {
+      devShells.default = pkgs.mkShellNoCC {
+        packages =
+          [
+            # We want to make sure we have the same
+            # Nix behavior across machines
+            pkgs.nix
+
+            # For CI
+            pkgs.actionlint
+
+            # Nix tools
+            pkgs.nil
+            pkgs.statix
+            self'.formatter
+
+            pkgs.just
+          ]
+          ++ lib.optionals pkgs.stdenv.hostPlatform.isDarwin [
+            # See above comment about Nix
+            inputs'.nix-darwin.packages.darwin-rebuild
+          ]
+          ++ lib.optionals pkgs.stdenv.hostPlatform.isLinux [
+
+            # Ditto
+            pkgs.nixos-rebuild
+
+            inputs'.agenix.packages.agenix
+          ];
+      };
+    };
+}