feat: move neovim flake into the overlay itself

Maintaing the flake in the official neovim repository became too much of
a burden so we are moving it out to a nix-community repository.

This is the opportunity to do more and add automation so that the neovim
nix overlay doesnt ever break !

Co-authored-by: Riley Bruins <ribru17@hotmail.com>
Co-authored-by: Matthieu Coudron <886074+teto@users.noreply.github.com>
Co-authored-by: Will Ruggiano <wmruggiano@gmail.com>

.envrc.developer.template

@@ -0,0 +1 @@
+use flake . --override-input neovim-src /path/to/neovim

.envrc.minimal.template

@@ -0,0 +1 @@
+use flake .#minimal

.gitignore

@@ -1,5 +1,11 @@
-# nix
+# direnv
+/.direnv
+/.envrc
+
+# neovim-developer
+/runtime/
 
+# nix
 result
 result-*
 .pre-commit-config.yaml

flake-compat.nix

@@ -3,11 +3,12 @@
     let
       lock = builtins.fromJSON (builtins.readFile ./flake.lock);
     in
-    fetchTarball {
-      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
-      sha256 = lock.nodes.flake-compat.locked.narHash;
-    }
+      fetchTarball {
+        url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+        sha256 = lock.nodes.flake-compat.locked.narHash;
+      }
   )
   {
     src = ./.;
-  }).defaultNix
+  })
+.defaultNix

flake.nix

@@ -2,15 +2,34 @@
   description = "Neovim flake";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-    flake-parts = { url = "github:hercules-ci/flake-parts"; inputs.nixpkgs-lib.follows = "nixpkgs"; };
-    hercules-ci-effects = { url = "github:hercules-ci/hercules-ci-effects"; inputs.nixpkgs.follows = "nixpkgs"; };
-    flake-compat = { url = "github:edolstra/flake-compat"; flake = false; };
-    neovim-flake = { url = "github:neovim/neovim?dir=contrib"; inputs.nixpkgs.follows = "nixpkgs"; };
+    nixpkgs.url = "github:NixOS/nixpkgs/3305b2b25e4ae4baee872346eae133cf6f611783";
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+    hercules-ci-effects = {
+      url = "github:hercules-ci/hercules-ci-effects";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+    neovim-src = {
+      url = "github:neovim/neovim";
+      flake = false;
+    };
+    pre-commit-hooks = {
+      url = "github:cachix/pre-commit-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.nixpkgs-stable.follows = "nixpkgs";
+    };
   };
 
   outputs = inputs:
-    inputs.flake-parts.lib.mkFlake { inherit inputs; } ({ config, ... }: {
+    inputs.flake-parts.lib.mkFlake
+    {inherit inputs;}
+    ({config, ...}: {
       systems = [
         "x86_64-linux"
         "x86_64-darwin"
@@ -19,33 +38,7 @@
       ];
 
       imports = [
-        inputs.flake-parts.flakeModules.easyOverlay
-        inputs.hercules-ci-effects.flakeModule
+        ./flake
       ];
-
-      perSystem = { inputs', system, config, lib, pkgs, ... }: {
-        packages = {
-          neovim = inputs'.neovim-flake.packages.neovim // (lib.optionalAttrs pkgs.stdenv.isDarwin { ignoreFailure = true; });
-          default = config.packages.neovim;
-        };
-        overlayAttrs = lib.genAttrs [ "neovim-unwrapped" "neovim-nightly" ] (_: config.packages.neovim);
-      };
-
-      flake = {
-        defaultPackage = inputs.nixpkgs.lib.genAttrs config.systems (system: inputs.self.packages.${system}.default);
-        overlay = inputs.self.overlays.default;
-      };
-
-      hercules-ci.flake-update = {
-        enable = true;
-        baseMerge.enable = true;
-        baseMerge.method = "rebase";
-        autoMergeMethod = "rebase";
-        # Update everynight at midnight
-        when = {
-          hour = [ 0 ];
-          minute = 0;
-        };
-      };
     });
 }

flake/checks.nix

@@ -0,0 +1,22 @@
+{inputs, ...}: {
+  perSystem = {
+    pkgs,
+    config,
+    ...
+  }: {
+    checks = {
+      # TODO: not working: remove ?
+      # shlint = pkgs.runCommand "shlint" {
+      #   nativeBuildInputs = [pkgs.shellcheck];
+      #   preferLocalBuild = true;
+      # } "make -C ${inputs.neovim-src} shlint > $out";
+
+      inherit
+        (config.packages)
+        neovim
+        neovim-debug
+        neovim-developer
+        ;
+    };
+  };
+}

flake/ci.nix

@@ -0,0 +1,17 @@
+{inputs, ...}: {
+  imports = [
+    inputs.hercules-ci-effects.flakeModule
+  ];
+
+  hercules-ci.flake-update = {
+    enable = true;
+    baseMerge.enable = true;
+    baseMerge.method = "rebase";
+    autoMergeMethod = "rebase";
+    # Update everynight at midnight
+    when = {
+      hour = [0];
+      minute = 0;
+    };
+  };
+}

flake/default.nix

@@ -0,0 +1,20 @@
+{inputs, ...}: {
+  imports = [
+    ./checks.nix
+    ./ci.nix
+    ./devshells.nix
+    ./overlays.nix
+    ./packages
+    inputs.pre-commit-hooks.flakeModule
+  ];
+
+  perSystem = {pkgs, ...}: {
+    formatter = pkgs.alejandra;
+    pre-commit.settings.hooks.alejandra.enable = true;
+
+    # Neovim uses lua 5.1 as it is the version which supports JIT
+    _module.args = {
+      lua = pkgs.lua5_1;
+    };
+  };
+}