coq-nvim: init plugin

still need to add most options, but this is enough to be usable
right now! This also sets up the work needed for other completion
frameworks, notably things like nvim-cmp and compe.

plugins/nvim-lsp/default.nix

@@ -40,33 +40,49 @@ in
         default = "";
       };
 
-      capabilities = mkOption {
+      setupWrappers = mkOption {
+        type = with types; listOf (functionTo str);
+        description = "Code to be run to wrap the setup args. Takes in an argument containing the previous results, and returns a new string of code.";
+        default = [];
+      };
+
+      preConfig = mkOption {
         type = types.lines;
-        description = "A lua function defining the capabilities of a new LSP buffer.";
+        description = "Code to be run before loading the LSP. Useful for requiring plugins";
         default = "";
       };
     };
   };
 
-  config = mkIf cfg.enable {
+  config = let
+    runWrappers = wrappers: s:
+    if wrappers == [] then s
+    else (head wrappers) (runWrappers (tail wrappers) s);
+  in mkIf cfg.enable {
     programs.nixvim = {
       extraPlugins = [ pkgs.vimPlugins.nvim-lspconfig ];
 
       # Enable all LSP servers
       extraConfigLua = ''
         -- LSP {{{
-        local __lspServers = ${helpers.toLuaObject cfg.enabledServers}
-        local __lspOnAttach = function(client)
-          ${cfg.onAttach}
-        end
+        do
+          ${cfg.preConfig}
+          local __lspServers = ${helpers.toLuaObject cfg.enabledServers}
+          local __lspOnAttach = function(client)
+            ${cfg.onAttach}
+          end
 
-        for i,server in ipairs(__lspServers) do
-          if type(server) == "string" then
-            require('lspconfig')[server].setup {
-              on_attach = __lspOnAttach
-            }
-          else
-            require('lspconfig')[server.name].setup(server.extraOptions)
+          local __setup = ${runWrappers cfg.setupWrappers "{
+            on_attach = __lspOnAttach
+          }"}
+
+          for i,server in ipairs(__lspServers) do
+            if type(server) == "string" then
+              require('lspconfig')[server].setup(__setup)
+            else
+              local options = ${runWrappers cfg.setupWrappers "server.extraOptions"}
+              require('lspconfig')[server.name].setup(options)
+            end
           end
         end
         -- }}}