From e4eba37a68d50179ff5af1705a54d5fd508f7bd5 Mon Sep 17 00:00:00 2001
From: Joscha Feth <joscha@feth.com>
Date: Wed, 5 Jun 2024 14:48:47 +0100
Subject: [PATCH 1/2] feat: add yamlfmt

---
 README.md         |  1 +
 modules/hooks.nix | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/README.md b/README.md
index 8c48c5c9..d0c17900 100644
--- a/README.md
+++ b/README.md
@@ -304,6 +304,7 @@ clang-format supports.
 
 - [check-yaml](https://github.com/pre-commit/pre-commit-hooks/blob/main/pre_commit_hooks/check_yaml.py)
 - [sort-simple-yaml](https://github.com/pre-commit/pre-commit-hooks/blob/main/pre_commit_hooks/sort_simple_yaml.py)
+- [yamlfmt](https://github.com/google/yamlfmt)
 - [yamllint](https://github.com/adrienverge/yamllint)
 
 ### TOML
diff --git a/modules/hooks.nix b/modules/hooks.nix
index d4b73d09..5590f3ab 100644
--- a/modules/hooks.nix
+++ b/modules/hooks.nix
@@ -1601,6 +1601,25 @@ in
           };
         };
       };
+      yamlfmt = mkOption {
+        description = lib.mdDoc "yamlfmt hook";
+        type = types.submodule {
+          imports = [ hookModule ];
+          options.settings = {
+            configPath =
+              mkOption {
+                type = types.str;
+                description = lib.mdDoc "Path to a custom configuration file.";
+                # An empty string translates to yamlfmt looking for a configuration file in the
+                # following locations (by order of preference):
+                # a file named .yamlfmt, yamlfmt.yml, yamlfmt.yaml, .yamlfmt.yaml or .yamlfmt.yml in the current working directory
+                # See details [here](https://github.com/google/yamlfmt/blob/main/docs/config-file.md#config-file-discovery)
+                default = "";
+                example = ".yamlfmt";
+              };
+          };
+        };
+      };
       yamllint = mkOption {
         description = lib.mdDoc "yamllint hook";
         type = types.submodule {
@@ -3413,6 +3432,27 @@ lib.escapeShellArgs (lib.concatMap (ext: [ "--ghc-opt" "-X${ext}" ]) hooks.ormol
           "${hooks.vale.package}/bin/vale${cmdArgs} ${hooks.vale.settings.flags}";
         types = [ "text" ];
       };
+      yamlfmt =
+        {
+          name = "yamlfmt";
+          description = "Formatter for YAML files.";
+          types = [ "file" "yaml" ];
+          package = tools.yamlfmt;
+          entry =
+            let
+              cmdArgs =
+                mkCmdArgs
+                  (with hooks.yamlfmt.settings; [
+                    # Exit non-zero on changes
+                    [ true "-lint" ]
+                    # But do not print the diff
+                    [ true "-quiet" ]
+                    # See https://github.com/google/yamlfmt/blob/main/docs/config-file.md#config-file-discovery
+                    [ (configPath != "") "-conf ${configPath}" ]
+                  ]);
+            in
+            "${hooks.yamlfmt.package}/bin/yamlfmt ${cmdArgs}";
+        };
       yamllint =
         {
           name = "yamllint";

From d74bff580363f769289a4b4938d30555433b858f Mon Sep 17 00:00:00 2001
From: Joscha Feth <joscha@feth.com>
Date: Thu, 6 Jun 2024 02:03:38 +1000
Subject: [PATCH 2/2] fix: update tools.nix to include yamlfmt

---
 nix/tools.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nix/tools.nix b/nix/tools.nix
index bb9549f4..a04dc1bf 100644
--- a/nix/tools.nix
+++ b/nix/tools.nix
@@ -72,6 +72,7 @@
 , typos
 , typstfmt
 , zprint
+, yamlfmt
 , yamllint
 , go
 , go-tools
@@ -146,6 +147,7 @@ in
     typos
     typstfmt
     vale
+    yamlfmt
     yamllint
     zprint
     ;