plugins/conform: init + test

plugins/default.nix

@@ -64,6 +64,7 @@
     ./languages/zig.nix
 
     ./lsp
+    ./lsp/conform-nvim.nix
     ./lsp/fidget.nix
     ./lsp/inc-rename.nix
     ./lsp/lspsaga.nix

plugins/lsp/conform.nix

@@ -0,0 +1,90 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.plugins.conform;
+  helpers = import ../helpers.nix {inherit lib;};
+in {
+  options.plugins.conform =
+    helpers.extraOptionsOptions
+    // {
+      enable = mkEnableOption "conform.nvim";
+
+      package = helpers.mkPackageOption "conform.nvim" pkgs.vimPlugins.conform-nvim;
+
+      # Map of filetype to formatters
+      formattersByFt =
+        helpers.defaultNullOpts.mkNullable types.attrs
+        "see documentation"
+        ''
+          Map of filetype to formatters
+          lua = { "stylua" },
+          Conform will run multiple formatters sequentially
+          python = { "isort", "black" },
+          Use a sub-list to run only the first available formatter
+          javascript = { { "prettierd", "prettier" } },
+          Use the "*" filetype to run formatters on all filetypes.
+          ["*"] = { "codespell" },
+          Use the "_" filetype to run formatters on filetypes that don't
+          have other formatters configured.
+          ["_"] = { "trim_whitespace" },
+        '';
+      # If this is set, Conform will run the formatter on save.
+      # It will pass the table to conform.format().
+      # This can also be a function that returns the table.
+      # See :help conform.format for details.
+      formatOnSave = {
+        lspFallback =
+          helpers.defaultNullOpts.mkBool true
+          "See :help conform.format for details.";
+        timeoutMs =
+          helpers.defaultNullOpts.mkNullable (types.int) 1000
+          "See :help conform.format for details.";
+      };
+
+      # If this is set, Conform will run the formatter asynchronously after save.
+      # It will pass the table to conform.format().
+      # This can also be a function that returns the table.
+      formatAfterSave = {
+        lspFallback =
+          helpers.defaultNullOpts.mkBool true
+          "See :help conform.format for details.";
+      };
+
+      # Set the log level. Use `:ConformInfo` to see the location of the log file.
+      logLevel =
+        helpers.defaultNullOpts.mkNullable
+        types.str
+        "vim.log.levels.ERROR"
+        " See :h log_levels ";
+
+      # Conform will notify you when a formatter errors
+      notifyOnError =
+        helpers.defaultNullOpts.mkBool true
+        "Conform will notify you when a formatter errors";
+
+      # Custom formatters and changes to built-in formatters
+      formatters =
+        helpers.defaultNullOpts.mkNullable types.attrs
+        "see documentation"
+        "Custom formatters and changes to built-in formatters";
+    };
+
+  config = let
+    setupOptions = with cfg;
+      {
+        inherit formattersByFt;
+      }
+      // cfg.extraOptions;
+  in
+    mkIf cfg.enable {
+      extraPlugins = [cfg.package];
+
+      extraConfigLua = ''
+        require("conform").setup(${helpers.toLuaObject setupOptions})
+      '';
+    };
+}

tests/test-sources/plugins/lsp/conform.nix

@@ -0,0 +1,16 @@
+{
+  empty = {
+    plugins.conform.enable = true;
+  };
+
+  example = {
+    plugins.conform = {
+      enable = true;
+      formatters_by_ft = {
+        "lua" = ["stylua"];
+        "python" = ["isort" "black"];
+        "javascript" = [["prettierd" "prettier"]];
+      };
+    };
+  };
+}