use treesitter-textobjects instead (#380)

Note that we should keep the branch of nvim-treesitter and nvim-treesitter-textobjects the same. `main` is targeted at nightly neovim and `master` is for stable neovim. See also https://github.com/nvim-treesitter/nvim-treesitter/issues/4767

lua/config/treesitter-textobjects.lua

@@ -0,0 +1,44 @@
+require("nvim-treesitter.configs").setup {
+  textobjects = {
+    select = {
+      enable = true,
+
+      -- Automatically jump forward to textobj, similar to targets.vim
+      lookahead = true,
+
+      keymaps = {
+        -- You can use the capture groups defined in textobjects.scm
+        ["af"] = "@function.outer",
+        ["if"] = "@function.inner",
+        ["ac"] = "@class.outer",
+        -- You can optionally set descriptions to the mappings (used in the desc parameter of
+        -- nvim_buf_set_keymap) which plugins like which-key display
+        ["ic"] = { query = "@class.inner", desc = "Select inner part of a class region" },
+      },
+      -- You can choose the select mode (default is charwise 'v')
+      --
+      -- Can also be a function which gets passed a table with the keys
+      -- * query_string: eg '@function.inner'
+      -- * method: eg 'v' or 'o'
+      -- and should return the mode ('v', 'V', or '<c-v>') or a table
+      -- mapping query_strings to modes.
+      selection_modes = {
+        ["@function.inner"] = "V", -- linewise
+        ["@function.outer"] = "V", -- linewise
+        ["@class.outer"] = "V", -- linewise
+        ["@class.inner"] = "V", -- linewise
+        ["@parameter.outer"] = "v", -- charwise
+      },
+      -- If you set this to `true` (default is `false`) then any textobject is
+      -- extended to include preceding or succeeding whitespace. Succeeding
+      -- whitespace has priority in order to act similarly to eg the built-in
+      -- `ap`.
+      --
+      -- Can also be a function which gets passed a table with the keys
+      -- * query_string: eg '@function.inner'
+      -- * selection_mode: eg 'v'
+      -- and should return true or false
+      include_surrounding_whitespace = false,
+    },
+  },
+}

lua/plugin_specs.lua

@@ -61,10 +61,14 @@ local plugin_specs = {
       require("config.treesitter")
     end,
   },
-
-  -- Python-related text object
-  { "jeetsukumaran/vim-pythonsense", ft = { "python" } },
-
+  {
+    "nvim-treesitter/nvim-treesitter-textobjects",
+    event = "VeryLazy",
+    branch = "master",
+    config = function()
+      require("config.treesitter-textobjects")
+    end,
+  },
   { "machakann/vim-swap", event = "VeryLazy" },
 
   -- IDE for Lisp