From 78b3796e681032a65f7fcf1aa3975632d70cd3f8 Mon Sep 17 00:00:00 2001
From: Price Hiller <price@orion-technologies.io>
Date: Sat, 16 Mar 2024 14:59:19 -0500
Subject: [PATCH] feat: add check-fmt-pre-commit.bash to git hooks

---
 config/default.nix                    |  3 ++-
 flake.nix                             |  3 ++-
 scripts/check-fmt-git-files.bash      |  2 +-
 scripts/check-fmt-git-pre-commit.bash | 22 ++++++++++++++++++++++
 4 files changed, 27 insertions(+), 3 deletions(-)
 create mode 100644 scripts/check-fmt-git-pre-commit.bash

diff --git a/config/default.nix b/config/default.nix
index e1da9e64..a067c9d1 100644
--- a/config/default.nix
+++ b/config/default.nix
@@ -28,6 +28,7 @@ in {
   home = {
     packages = with pkgs;
       [
+        Fmt
         nodePackages.prettier
         shfmt
         bob-nvim
@@ -236,7 +237,7 @@ in {
     };
     git = {
       enable = true;
-      hooks = { pre-commit = ../scripts/check-fmt-git-files.bash; };
+      hooks = { pre-commit = ../scripts/check-fmt-git-pre-commit.bash; };
       userName = "Price Hiller";
       userEmail = "price@orion-technologies.io";
       aliases = { unstage = "reset HEAD --"; };
diff --git a/flake.nix b/flake.nix
index 3b40ba0e..b8db1827 100644
--- a/flake.nix
+++ b/flake.nix
@@ -41,7 +41,7 @@
       defaultPackage.x86_64-linux = home-manager.defaultPackage.x86_64-linux;
       targets.genericLinux = { enable = true; };
       homeConfigurations.${username} =
-        home-manager.lib.homeManagerConfiguration {
+        home-manager.lib.homeManagerConfiguration rec {
           pkgs = nixpkgs.legacyPackages.${system};
           extraSpecialArgs = {
             inherit inputs;
@@ -57,6 +57,7 @@
                 inputs.kanagawa-gtk.overlays.default
                 inputs.nixgl.overlay
                 (final: prev: {
+                  Fmt = pkgs.writeScriptBin "Fmt" (builtins.readFile ./scripts/fmt.bash);
                   waybar = inputs.waybar.packages.${system}.default;
                   lxappearance = prev.lxappearance.overrideAttrs (oldAttrs: {
                     postInstall = ''
diff --git a/scripts/check-fmt-git-files.bash b/scripts/check-fmt-git-files.bash
index 72a8f9d1..2895f4c8 100755
--- a/scripts/check-fmt-git-files.bash
+++ b/scripts/check-fmt-git-files.bash
@@ -16,7 +16,7 @@ main() {
 		fi
 	done < <(git ls-tree --full-name --full-tree --name-only -r HEAD)
 
-	"${root}/scripts/fmt.bash" -- "${files[@]}"
+	Fmt -- "${files[@]}"
 }
 
 main "${@}"
diff --git a/scripts/check-fmt-git-pre-commit.bash b/scripts/check-fmt-git-pre-commit.bash
new file mode 100644
index 00000000..01fe49bf
--- /dev/null
+++ b/scripts/check-fmt-git-pre-commit.bash
@@ -0,0 +1,22 @@
+#!/usr/bin/env -S nix --extra-experimental-features "flakes nix-command" shell nixpkgs#bash nixpkgs#git --command bash
+# vim: ft=sh
+
+set -euo pipefail
+
+main() {
+	local root
+	root="$(git rev-parse --show-toplevel)"
+
+	local files=()
+
+	while IFS= read -r file; do
+		local fpath="${root}/${file}"
+		if [[ -r "${fpath}" ]]; then
+			files+=("${fpath}")
+		fi
+	done < <(git diff --name-only --staged --diff-filter=d)
+
+	Fmt -- "${files[@]}"
+}
+
+main "${@}"