languages/ocaml: follow other languages' format

modules/plugins/languages/ocaml.nix

@@ -4,15 +4,49 @@
   lib,
   ...
 }: let
+  inherit (builtins) attrNames;
   inherit (lib.options) mkEnableOption mkOption;
   inherit (lib.modules) mkIf mkMerge;
   inherit (lib.meta) getExe;
   inherit (lib.lists) isList;
-  inherit (lib.types) either listOf package str;
+  inherit (lib.types) either enum listOf package str;
   inherit (lib.nvim.types) mkGrammarOption;
   inherit (lib.nvim.lua) expToLua;
 
   cfg = config.vim.languages.ocaml;
+
+  defaultServer = "ocaml-lsp";
+  servers = {
+    ocaml-lsp = {
+      package = pkgs.ocamlPackages.ocaml-lsp;
+      lspConfig = ''
+        lspconfig.ocamllsp.setup {
+          capabilities = capabilities,
+          on_attach = default_on_attach,
+            cmd = ${
+            if isList cfg.lsp.package
+            then expToLua cfg.lsp.package
+            else ''{"${getExe cfg.lsp.package}"}''
+          };
+        }
+      '';
+    };
+  };
+
+  defaultFormat = "ocamlformat";
+  formats = {
+    ocamlformat = {
+      package = pkgs.ocamlPackages.ocamlformat;
+      nullConfig = ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.formatting.ocamlformat.with({
+            command = "${cfg.format.package}/bin/ocamlformat",
+          })
+        )
+      '';
+    };
+  };
 in {
   options.vim.languages.ocaml = {
     enable = mkEnableOption "OCaml language support";
@@ -24,19 +58,29 @@ in {
 
     lsp = {
       enable = mkEnableOption "OCaml LSP support (ocaml-lsp)" // {default = config.vim.languages.enableLSP;};
+      server = mkOption {
+        description = "OCaml LSP server to user";
+        type = enum (attrNames servers);
+        default = defaultServer;
+      };
       package = mkOption {
-        description = "ocaml language server package, or the command to run as a list of strings";
+        description = "OCaml language server package, or the command to run as a list of strings";
         type = either package (listOf str);
-        default = pkgs.ocamlPackages.ocaml-lsp;
+        default = servers.${cfg.lsp.server}.package;
       };
     };
 
     format = {
       enable = mkEnableOption "OCaml formatting support (ocamlformat)" // {default = config.vim.languages.enableFormat;};
+      type = mkOption {
+        description = "OCaml formatter to use";
+        type = enum (attrNames formats);
+        default = defaultFormat;
+      };
       package = mkOption {
         description = "OCaml formatter package";
         type = package;
-        default = pkgs.ocamlPackages.ocamlformat;
+        default = formats.${cfg.format.type}.package;
       };
     };
   };
@@ -44,17 +88,7 @@ in {
   config = mkIf cfg.enable (mkMerge [
     (mkIf cfg.lsp.enable {
       vim.lsp.lspconfig.enable = true;
-      vim.lsp.lspconfig.sources.ocaml-lsp = ''
-        lspconfig.ocamllsp.setup {
-          capabilities = capabilities,
-          on_attach = default_on_attach,
-            cmd = ${
-            if isList cfg.lsp.package
-            then expToLua cfg.lsp.package
-            else ''{"${getExe cfg.lsp.package}"}''
-          };
-        }
-      '';
+      vim.lsp.lspconfig.sources.ocaml-lsp = servers.${cfg.lsp.server}.lspConfig;
     })
 
     (mkIf cfg.treesitter.enable {
@@ -64,14 +98,7 @@ in {
 
     (mkIf cfg.format.enable {
       vim.lsp.null-ls.enable = true;
-      vim.lsp.null-ls.sources.ocamlformat = ''
-        table.insert(
-          ls_sources,
-          null_ls.builtins.formatting.ocamlformat.with({
-            command = "${cfg.format.package}/bin/ocamlformat",
-          })
-        )
-      '';
+      vim.lsp.null-ls.sources.ocamlformat = formats.${cfg.format.type}.nullConfig;
     })
   ]);
 }