devos/users/modules/neovim/nvim-lsp.nix

{ lib, pkgs, config, ... }:
with lib;
let
  cfg = config.mae.nvim;
  lspLangConfigType = types.submodule {
    options = {
      enable = mkEnableOption "Enable named lsp lang config";
      script = mkOption {
        type = types.lines;
        default = "{}";
      };
    };
  };
  mkLspLangConfig = name: cfg: ''
    local cfg = ${cfg.script}
    cfg["capabilities"] = require('cmp_nvim_lsp').default_capabilities()
    require'lspconfig'["${name}"].setup(cfg)
  '';
  mkLspLangConfigs = cfgs: lib.strings.concatStringsSep "\n" ((lib.attrsets.mapAttrsToList mkLspLangConfig cfgs));
in
{
  options.mae.nvim.lsp = {
    enable = mkEnableOption "Enable lsp support in nvim with nvim-lspconfig and cmp-nvim";
    servers = mkOption {
      type = types.attrsOf lspLangConfigType;
      default = [ ];
    };
  };

  config = mkIf cfg.lsp.enable {
    programs.neovim = {
      plugins = with pkgs.vimPlugins; [
        nvim-snippy
        cmp-nvim-lsp
        cmp-buffer
        cmp-path
        cmp-tmux
        cmp-snippy
        {
          plugin = nvim-cmp;
          config = ''
            local cmp = require'cmp'

            cmp.setup({
              snippet = {
                -- REQUIRED - you must specify a snippet engine
                expand = function(args)
                  require('snippy').expand_snippet(args.body)
                end,
              },
              window = {},
              mapping = cmp.mapping.preset.insert({
                ['<C-b>'] = cmp.mapping.scroll_docs(-4),
                ['<C-f>'] = cmp.mapping.scroll_docs(4),
                ['<C-Space>'] = cmp.mapping.complete(),
                ['<C-e>'] = cmp.mapping.abort(),
                ['<CR>'] = cmp.mapping.confirm({ select = true }),
              }),
              sources = cmp.config.sources({
                { name = 'nvim_lsp' },
                { name = 'snippy' }, 
                { name = 'path' }
              }, {
                { name = 'buffer' },
                { name= 'tmux' }
              })
            })

            -- Set configuration for specific filetype.
            cmp.setup.filetype('gitcommit', {
              sources = cmp.config.sources({
                { name = 'cmp_git' }, -- You can specify the `cmp_git` source if you were installed it.
              }, {
                { name = 'buffer' },
              })
            })
          '';
          type = "lua";
        }
        {
          plugin = nvim-lspconfig;
          config = mkLspLangConfigs cfg.lsp.servers;
          type = "lua";
        }
      ];
    };
  };
}