feat(neovim): set up nvim-treesitter

home/editors/neovim/default.nix

@@ -21,7 +21,10 @@ let
     EOF
   '';
 in {
-  home.packages = with pkgs; [ graphviz ];
+  home.packages = with pkgs; [
+    gcc # required for nvim-treesitter
+    graphviz
+  ];
 
   programs.neovim = {
     enable = true;
@@ -36,7 +39,6 @@ in {
       lightline-vim
       nerdtree
       vim-startify
-      vim-polyglot
       vim-visual-multi
       vim-surround
       vim-commentary
@@ -49,9 +51,14 @@ in {
       vim-closetag
       auto-pairs
       camelcasemotion
-      argtextobj-vim
       wmgraphviz-vim
 
+      # use :TSInstall & :TSUpdate to manage parsers
+      nvim-treesitter
+      nvim-treesitter-context
+      nvim-treesitter-refactor
+      nvim-treesitter-textobjects
+
       nvim-lspconfig
       # nvim-dap
 
@@ -63,10 +70,11 @@ in {
       readFile ./init.vim # + readFile ./vim-surround-fix.vim
       + readFile ./which-key.vim + readFile ./test.vim
       + vimLua (readFile ./lsp/extensions.lua) + readFile ./lsp/lsp.vim
-      + vimLua (readFile ./lsp/lsp.lua);
+      + vimLua (readFile ./lsp/lsp.lua) + vimLua (readFile ./treesitter.lua);
     withNodeJs = true;
     withPython = false;
   };
 
+  xdg.configFile."nvim/filetype.vim".source = ./filetype.vim;
   xdg.configFile."nvim/scripts.vim".source = ./scripts.vim;
 }

home/editors/neovim/filetype.vim

@@ -0,0 +1,2 @@
+au BufRead,BufNewFile *.nix set filetype=nix
+

home/editors/neovim/treesitter.lua

@@ -0,0 +1,47 @@
+-- TODO install parsers declaratively instead of :TSInstall & :TSUpdate
+
+require'nvim-treesitter.configs'.setup {
+  ensure_installed = 'all',
+  highlight = {
+    enable = true,
+  },
+  indent = {
+    enable = true,
+  },
+  refactor = {
+    highlight_definitions = { enable = true },
+    highlight_current_scope = { enable = true },
+    navigation = {
+      enable = true,
+      keymaps = {
+        goto_definition_lsp_fallback = "gnd",
+        list_definitions = "gnD",
+        list_definitions_toc = "gO",
+        goto_next_usage = "<a-*>",
+        goto_previous_usage = "<a-#>",
+      },
+    },
+  },
+  incremental_selection = {
+    enable = true,
+    keymaps = {
+      init_selection = "<CR>",
+      scope_incremental = "<CR>",
+      node_incremental = "<TAB>",
+      node_decremental = "<S-TAB>",
+    },
+  },
+  textobjects = {
+    select = {
+      enable = true,
+      keymaps = {
+        ["af"] = "@function.outer",
+        ["if"] = "@function.inner",
+        ["ac"] = "@class.outer",
+        ["ic"] = "@class.inner",
+        ["aa"] = "@parameter.outer",
+        ["ia"] = "@parameter.inner",
+      },
+    },
+  },
+}