Per Language Indent Config

lib/languages.nix

@@ -4,6 +4,7 @@
   inherit (lib.types) listOf bool str submodule attrsOf anything either nullOr uniq;
   inherit (lib.nvim.attrsets) mapListToAttrs;
   inherit (lib.nvim.types) luaInline;
+  inherit (lib.generators) mkLuaInline;
 in {
   # TODO: remove
   diagnosticsToLua = {
@@ -77,4 +78,26 @@ in {
       };
     };
   };
+
+  # maybe put generic function to set indent for provided langs
+  # Then we can just call it with the lib arg
+
+  setLanguageIndent = {language, indentSize}: {
+    vim.autocmds = [
+      {
+        desc = "Sets indent for nix files";
+        event = ["FileType"];
+        pattern = [ language ];
+        callback = mkLuaInline ''
+          function()
+            vim.bo.tabstop = ${toString indentSize}
+            vim.bo.softtabstop = ${toString indentSize}
+            vim.bo.shiftwidth = ${toString indentSize}
+          end
+        '';
+        once = true;
+      }
+    ];
+  };
+
 }

modules/plugins/languages/markdown.nix

@@ -13,6 +13,7 @@
   inherit (lib.nvim.types) diagnostics mkGrammarOption mkPluginSetupOption deprecatedSingleOrListOf;
   inherit (lib.nvim.dag) entryAnywhere;
   inherit (lib.nvim.attrsets) mapListToAttrs;
+  inherit (lib.nvim.languages) setLanguageIndent;
   inherit (lib.trivial) warn;
 
   cfg = config.vim.languages.markdown;
@@ -205,5 +206,11 @@ in {
           cfg.extraDiagnostics.types);
       };
     })
+
+    (setLanguageIndent {
+      language = "markdown";
+      indentSize = 6;
+    })
+
   ]);
 }

modules/plugins/languages/nix.nix

@@ -4,14 +4,16 @@
   lib,
   ...
 }: let
-  inherit (builtins) attrNames;
+  inherit (builtins) attrNames toString;
   inherit (lib) concatStringsSep;
   inherit (lib.meta) getExe;
   inherit (lib.options) mkEnableOption mkOption;
   inherit (lib.modules) mkIf mkMerge;
   inherit (lib.types) enum;
+  inherit (lib.types) int;
   inherit (lib.nvim.types) mkGrammarOption diagnostics deprecatedSingleOrListOf;
   inherit (lib.nvim.attrsets) mapListToAttrs;
+  inherit (lib.nvim.languages) setLanguageIndent;
 
   cfg = config.vim.languages.nix;
 
@@ -106,6 +108,12 @@ in {
         inherit defaultDiagnosticsProvider;
       };
     };
+
+    indentSize = mkOption {
+      description = "Sets the indent size in spaces for .nix files";
+      type = int;
+      default = 10;
+    };
   };
 
   config = mkIf cfg.enable (mkMerge [
@@ -160,5 +168,11 @@ in {
           cfg.extraDiagnostics.types);
       };
     })
+
+    (setLanguageIndent {
+      language = "nix";
+      indentSize = cfg.indentSize;
+    })
+
   ]);
 }