nvim-lint: added required files support

modules/plugins/diagnostics/nvim-lint/config.nix

@@ -38,8 +38,29 @@ in {
           {
             event = ["BufWritePost"];
             callback = mkLuaInline ''
-              function()
-                require("lint").try_lint()
+              function(args)
+                local ft = vim.api.nvim_get_option_value("filetype", { buf = args.buf })
+                local linters = require("lint").linters
+                local linters_from_ft = require("lint").linters_by_ft[ft]
+
+                -- if no linter is configured for this filetype, stops linting
+                if linters_from_ft == nil then return end
+
+                for _, name in ipairs(linters_from_ft) do
+                  local cwd = linters[name].required_files
+
+                  -- if no configuration files are configured, lint
+                  if cwd == nil then
+                    require("lint").try_lint(name)
+                  else
+                    -- if configuration files are configured and present in the project, lint
+                    for _, fn in ipairs(cwd) do
+                      if vim.uv.fs_stat(fn) then
+                        require("lint").try_lint(name)
+                      end
+                    end
+                  end
+                end
               end
             '';
           }

modules/plugins/diagnostics/nvim-lint/nvim-lint.nix

@@ -69,6 +69,13 @@
         default = null;
         description = "Parser function";
       };
+
+      required_files = mkOption {
+        type = nullOr (listOf str);
+        default = null;
+        description = "Required files to lint";
+        example = ["eslint.config.js"];
+      };
     };
   };
 in {