add a bunch of language servers

config/programs/vim/modules/lsp/lsp.nix

@@ -0,0 +1,42 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
+with builtins;
+with lib; let
+  settingsFormat = pkgs.formats.json {};
+in {
+  config = {
+    extraLua = let
+      json_setup = settingsFormat.generate "nix-neovim-lsp-server-setup.json" config.lspconfig;
+    in
+      if config.isDesktop
+      then ''
+        local from_json = require('nix-neovim.utils').from_json
+        for k, v in pairs(from_json("${json_setup})) do
+          require("lspconfig")[k].setup(v)
+        end
+      ''
+      else "";
+    output.path.path =
+      if config.isDesktop
+      then config.lspconfigPath
+      else [];
+  };
+
+  options.lspconfig = mkOption {
+    type = with types; attrsOf (submodule {freeformType = settingsFormat.type;});
+    default = {};
+    description = ''
+      A set of options to `require("lspconfig").KEY.setup(VALUE)` in lua.
+    '';
+  };
+
+  options.lspconfigPath = mkOption {
+    type = with types; listOf package;
+    default = [];
+    description = "lspconfig binaries.";
+  };
+}

config/programs/vim/modules/lsp/misc.nix

@@ -0,0 +1,46 @@
+{pkgs, ...}: {
+  lspconfigPath = with pkgs; [
+    nodePackages.bash-language-server
+    clang
+    clang-tools
+    cmake-language-server
+    dhall-lsp-server
+    nodePackages.diagnostic-languageserver
+    nodePackages.dockerfile-language-server-nodejs
+    elixir-ls
+    gopls
+    haskell-language-server
+    nodePackages.vscode-css-languageserver-bin
+    nodePackages.vscode-html-languageserver-bin
+    nodePackages.vscode-json-languageserver
+    ltex-ls
+    lua-language-server
+    marksman
+    nil
+    pyright
+    nodePackages.typescript
+    nodePackages.typescript-language-server
+    nodePackages.vim-language-server
+  ];
+  lspconfig = {
+    bashls = {};
+    clangd = {};
+    cmake = {};
+    cssls = {};
+    dhall_lsp_server = {};
+    diagnosticls = {};
+    dockerls = {};
+    elixirls.cmd = "elixir-ls";
+    gopls = {};
+    hls.filetypes = ["haskell" "lhaskell" "cabal"];
+    html = {};
+    jsonls = {};
+    ltex = {};
+    lua_ls = {};
+    marksman = {};
+    nil_ls = {};
+    pyright = {};
+    tsserver = {};
+    vimls = {};
+  };
+}

config/programs/vim/modules/lsp/rust-analyzer.nix

@@ -0,0 +1,8 @@
+{pkgs, ...}: {
+  lspconfigPath = with pkgs; [
+    rust-analyzer
+  ];
+  lspconfig = {
+    rust_analyzer = {};
+  };
+}