manage the repository with nix

Add a flake.nix to manage the development shell, the formatters, add
some pre-commit checks, and such.

This might evolve a bit over time but this is a good starting point.

1 files changed, 30 insertions, 0 deletions

diff --git a/treefmt.nix b/treefmt.nix
new file mode 100644
index 0000000..6d19624
--- /dev/null
+++ b/treefmt.nix
@@ -0,0 +1,30 @@
+{ pkgs, ... }:
+{
+  # See https://github.com/numtide/treefmt-nix#supported-programs
+  projectRootFile = ".git/config";
+  settings.global.includes = [
+    "*.go"
+    "*.yaml"
+    "*.yml"
+    "*.md"
+    "*.nix"
+  ];
+  settings.global.fail-on-change = true;
+  settings.global.no-cache = true;
+  programs.gofumpt = {
+    enable = true;
+    package = pkgs.gofumpt;
+  };
+  programs.goimports.enable = true;
+  programs.golines.enable = true;
+  # GitHub Actions
+  programs.yamlfmt.enable = true;
+  programs.actionlint.enable = true;
+  # Markdown
+  programs.mdformat.enable = true;
+  # Nix
+  programs.nixfmt = {
+    enable = true;
+    package = pkgs.nixfmt-rfc-style;
+  };
+}