fred-neovim/config/language.nix

let selectOpts = "{behavior = cmp.SelectBehavior.Select}";
in { pkgs, ... }: {
  plugins = {
    cmp = {
      enable = true;
      settings = {
        autoEnableSources = true;
        performance = { debounce = 150; };
        sources = [
          { name = "path"; }
          {
            name = "nvim_lsp";
            keywordLength = 1;
          }
          {
            name = "buffer";
            keywordLength = 3;
          }
          { name = "supermaven"; }
        ];

        snippet.expand =
          "function(args) require('luasnip').lsp_expand(args.body) end";
        formatting = {
          fields = [ "menu" "abbr" "kind" ];
          format = ''
            function(entry, item)
              local menu_icon = {
                nvim_lsp = '[LSP]',
                luasnip = '[SNIP]',
                buffer = '[BUF]',
                path = '[PATH]',
              }

              item.menu = menu_icon[entry.source.name]
              return item
            end
          '';
        };

        mapping = {
          "<Up>" = "cmp.mapping.select_prev_item(${selectOpts})";
          "<Down>" = "cmp.mapping.select_next_item(${selectOpts})";

          "<C-p>" = "cmp.mapping.select_prev_item(${selectOpts})";
          "<C-n>" = "cmp.mapping.select_next_item(${selectOpts})";

          "<C-u>" = "cmp.mapping.scroll_docs(-4)";
          "<C-d>" = "cmp.mapping.scroll_docs(4)";

          "<C-e>" = "cmp.mapping.abort()";
          "<C-y>" = "cmp.mapping.confirm({select = true})";
          "<CR>" = "cmp.mapping.confirm({select = false})";

          "<C-f>" = ''
            cmp.mapping(
              function(fallback)
                if luasnip.jumpable(1) then
                  luasnip.jump(1)
                else
                  fallback()
                end
              end,
              { "i", "s" }
            )
          '';

          "<C-b>" = ''
            cmp.mapping(
              function(fallback)
                if luasnip.jumpable(-1) then
                  luasnip.jump(-1)
                else
                  fallback()
                end
              end,
              { "i", "s" }
            )
          '';

          "<Tab>" = ''
            cmp.mapping(
              function(fallback)
                local col = vim.fn.col('.') - 1

                if cmp.visible() then
                  cmp.select_next_item(select_opts)
                elseif col == 0 or vim.fn.getline('.'):sub(col, col):match('%s') then
                  fallback()
                else
                  cmp.complete()
                end
              end,
              { "i", "s" }
            )
          '';

          "<S-Tab>" = ''
            cmp.mapping(
              function(fallback)
                if cmp.visible() then
                  cmp.select_prev_item(select_opts)
                else
                  fallback()
                end
              end,
              { "i", "s" }
            )
          '';
        };
        window = {
          completion = {
            border = "rounded";
            winhighlight =
              "Normal:Normal,FloatBorder:Normal,CursorLine:Visual,Search:None";
            zindex = 1001;
            scrolloff = 0;
            colOffset = 0;
            sidePadding = 1;
            scrollbar = true;
          };
          documentation = {
            border = "rounded";
            winhighlight =
              "Normal:Normal,FloatBorder:Normal,CursorLine:Visual,Search:None";
            zindex = 1001;
            maxHeight = 20;
          };
        };
      };
    };
    cmp-nvim-lsp.enable = true;
    cmp-buffer.enable = true;
    cmp-path.enable = true;
    cmp-treesitter.enable = true;
    dap.enable = true;
    none-ls = {
      enable = true;
      sources.formatting = {
        black.enable = true;
        hclfmt.enable = true;
        just.enable = true;
        nixfmt = {
          enable = true;
          package = pkgs.nixfmt-rfc-style;
        };
        opentofu_fmt.enable = true;
        prettier.enable = true;
        # rubyfmt is broken on darwin-based systems
        rubyfmt.enable = (pkgs.stdenv.hostPlatform.system != "x86_64-darwin"
          && pkgs.stdenv.hostPlatform.system != "aarch64-darwin");
        sqlformat.enable = true;
        stylua.enable = true;
        yamlfmt.enable = true;
      };
      sources.diagnostics = {
        trivy.enable = true;
        yamllint.enable = true;
      };
    };

    conform-nvim = {
      enable = true;
      settings = {
        format_on_save = {
          lsp_fallback = "fallback";
          timeout_ms = 500;
        };
        notify_on_error = true;

        formatters_by_ft = {
          css = [ "prettier" ];
          html = [ "prettier" ];
          javascript = [ "prettier" ];
          javascriptreact = [ "prettier" ];
          json = [ "prettier" ];
          lua = [ "stylua" ];
          markdown = [ "prettier" ];
          nix = [ "nixfmt" ];
          python = [ "black" ];
          ruby = [ "rubyfmt" ];
          terraform = [ "tofu_fmt" ];
          tf = [ "tofu_fmt" ];
          typescript = [ "prettier" ];
          typescriptreact = [ "prettier" ];
          yaml = [ "yamlfmt" ];
        };
      };
    };

    lsp = {
      enable = true;
      inlayHints = true;
      keymaps = {
        diagnostic = {
          "<leader>E" = "open_float";
          "[" = "goto_prev";
          "]" = "goto_next";
          "<leader>do" = "setloclist";
        };
        lspBuf = {
          "K" = "hover";
          "gD" = "declaration";
          "gd" = "definition";
          "gr" = "references";
          "gI" = "implementation";
          "gy" = "type_definition";
          "<leader>rn" = "rename";
          "<leader>ca" = "code_action";
          "<leader>wl" = "list_workspace_folders";
          "<leader>wr" = "remove_workspace_folder";
          "<leader>wa" = "add_workspace_folder";
        };
      };
      preConfig = ''
        vim.diagnostic.config({
          virtual_text = false,
          severity_sort = true,
          float = {
            border = 'rounded',
            source = 'always',
          },
        })

        vim.lsp.handlers['textDocument/hover'] = vim.lsp.with(
          vim.lsp.handlers.hover,
          {border = 'rounded'}
        )

        vim.lsp.handlers['textDocument/signatureHelp'] = vim.lsp.with(
          vim.lsp.handlers.signature_help,
          {border = 'rounded'}
        )
      '';
      postConfig = ''
        local signs = { Error = " ", Warn = " ", Hint = " ", Info = " " }
        for type, icon in pairs(signs) do
          local hl = "DiagnosticSign" .. type
          vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = "" })
        end
      '';
      servers = {
        jsonls.enable = true;
        marksman.enable = true;
        nil-ls.enable = true;
        nixd.enable = true;
        omnisharp.enable = true;
        yamlls.enable = true;
      };
    };

    trouble = {
      enable = true;
      settings = { use_diagnostic_signs = true; };
    };

  };
}