root: configure markdown formatter

monorepo-revid: 4e858cdfd63675d8428ada557028684e8d039e21

1 files changed, 29 insertions, 0 deletions

diff --git a/root/nix/_treefmt-base.nix b/root/nix/_treefmt-base.nix
index d613092..21d7ea3 100644
--- a/root/nix/_treefmt-base.nix
+++ b/root/nix/_treefmt-base.nix
@@ -4,6 +4,31 @@
   formatters/linters. This will NOT enable the formatters/linters except
   for a few that are used across all projects (nixfmt, typos etc.).
 */
+{ lib, pkgs, ... }:
+let
+  rumdlConfig = (pkgs.formats.toml { }).generate "rumdl.toml" {
+    global = {
+      cache = false;
+      extend-enable = [ "MD060" ];
+    };
+
+    MD013 = {
+      reflow = true;
+      reflow-mode = "normalize";
+    };
+  };
+
+  wrappedRumdl = pkgs.symlinkJoin {
+    name = "rumdl-wrapped";
+    paths = [ pkgs.rumdl ];
+    nativeBuildInputs = [ pkgs.makeBinaryWrapper ];
+    postBuild = ''
+      makeBinaryWrapper "${pkgs.rumdl}/bin/rumdl" "$out/bin/rumdl" \
+        --add-flags "--config ${rumdlConfig}"
+    '';
+    meta.mainProgram = lib.getName pkgs.rumdl;
+  };
+in
 {
   projectRootFile = "README.md";
 
@@ -11,6 +36,10 @@
     # keep-sorted start block=yes
     keep-sorted.enable = true;
     nixfmt.enable = true;
+    rumdl-check = {
+      enable = true;
+      package = wrappedRumdl;
+    };
     typos.enable = true;
     # keep-sorted end
   };