switch to rumdl for markdown lint and format

Author: zowoq

dev/treefmt.nix

@@ -18,21 +18,13 @@ in
     nixfmt.enable = true;
     ruff-check.enable = true;
     ruff-format.enable = true;
+    rumdl-check.enable = true;
     shellcheck.enable = true;
     shfmt.enable = true;
     statix.enable = true;
     terraform.enable = true;
   };
 
-  programs.mdformat = {
-    enable = true;
-    excludes = [ "docs/*.md" ];
-    settings = {
-      number = true;
-      wrap = "no";
-    };
-  };
-
   programs.yamlfmt = {
     enable = true;
     settings.formatter.retain_line_breaks_single = true;
@@ -51,22 +43,6 @@ in
 
     dnscontrol.includes = [ "*dnsconfig.js" ];
 
-    mdformat-mkdocs = {
-      command = pkgs.mdformat.withPlugins (p: [
-        p.mdformat-frontmatter
-        p.mdformat-mkdocs
-        p.mdformat-simple-breaks
-      ]);
-      options = [
-        "--number"
-        "--wrap"
-        "no"
-      ];
-      includes = [
-        "docs/*.md"
-      ];
-    };
-
     shellcheck.priority = 1;
     shfmt.priority = 2;
 

pyproject.toml

@@ -32,3 +32,30 @@ ignore = [
   "S101",
   "SIM117",
 ]
+
+[tool.rumdl]
+disable = ["MD014", "MD041"]
+flavor = "gfm"
+
+[tool.rumdl.MD013]
+line-length = 0
+reflow = true
+reflow-mode = "sentence-per-line"
+
+[tool.rumdl.MD029]
+style = "ordered"
+
+[tool.rumdl.MD057]
+absolute-links = "relative_to_docs"
+compact-paths = true
+
+[tool.rumdl.MD074]
+absolute-links = "warn"
+not-found = "warn"
+omitted-files = "warn"
+
+[tool.rumdl.per-file-flavor]
+"docs/**/*.md" = "mkdocs"
+
+[tool.rumdl.per-file-ignores]
+"docs/**/*.md" = ["MD033", "MD059"]