dotfiles/modules/programs/nvim/new_plugins/cmp.nix

{ config, lib, pkgs, inputs, ... }:

let
  inherit (lib) mkEnableOption mkIf readFile;
in
{
  home-manager.users.moritz.programs.nixvim = {
    extraConfigLuaPre = ''
      local has_words_before = function()
        if vim.api.nvim_buf_get_option(0, "buftype") == "prompt" then
          return false
        end
        local line, col = unpack(vim.api.nvim_win_get_cursor(0))
        return col ~= 0 and vim.api.nvim_buf_get_text(0, line-1, 0, line-1, col, {})[1]:match("^%s@*$") == nil
      end
    '';
    plugins.cmp = {
      autoEnableSources = true;
      enable = true;
      settings.sources = [
        { priority = 1; name = "async_path"; }
        { priority = 1; name = "buffer"; }
        { priority = 2; name = "nvim_lsp"; }
        { priority = 3; name = "nvim_lsp_signature_help"; }
        { priority = 4; name = "luasnip"; }
        { priority = 4; name = "vimtex"; }
      ];
      settings.mapping = {
        __raw = ''
          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 }),
              ["<Tab>"] = cmp.mapping(function(fallback)
                if cmp.visible() then
                  cmp.select_next_item({ behavior = cmp.SelectBehavior.Select })
                elseif require("luasnip").locally_jumpable(1) and has_words_before() then
                  require("luasnip").jump(1)
                else
                  fallback()
                end
              end, { "i", "s" }),
              ["<S-Tab>"] = cmp.mapping(function(fallback)
                if cmp.visible() then
                  cmp.select_prev_item({ behavior = cmp.SelectBehavior.Select })
                elseif require("luasnip").locally_jumpable(-1) then
                  require("luasnip").jump(-1)
                else
                  fallback()
                end
              end, { "i", "s" }),
              ["<C-n>"] = cmp.mapping(function(fallback)
                if require("luasnip").choice_active() then
                  require("luasnip").change_choice(1)
                elseif require("luasnip").locally_jumpable(1) then
                  require("luasnip").jump(1)
                else
                  fallback()
                end
              end, { "i", "s" }),
              ["<C-p>"] = cmp.mapping(function(fallback)
                if require("luasnip").choice_active() then
                  require("luasnip").change_choice(-1)
                elseif require("luasnip").locally_jumpable(-1) then
                  require("luasnip").jump(-1)
                else
                  fallback()
                end
              end, { "i", "s" }),
          })
        '';
      };
    };
  };
}