refactor(textobj): use configs and don't use VimL

2 files changed, 73 insertions, 41 deletions

diff --git a/lua/nvim-treesitter/configs.lua b/lua/nvim-treesitter/configs.lua
index 64d4170e2..2761f0be8 100644
--- a/lua/nvim-treesitter/configs.lua
+++ b/lua/nvim-treesitter/configs.lua
@@ -157,12 +157,15 @@ local config = {
       return queries.get_query(ft, 'highlights') ~= nil
     end
   },
-  -- selection = {
-  --   enable = false,
-  --   disable = {},
-  --   keymaps = {},
-  --   is_supported = function() return false end
-  -- },
+  textobj = {
+    enable = false,
+    disable = {},
+    keymaps = {
+      node_incremental="grn",
+      scope_incremental="grc"
+    },
+    is_supported = function() return true end
+  },
   -- folding = {
   --   enable = false,
   --   disable = {},
diff --git a/lua/nvim-treesitter/textobj.lua b/lua/nvim-treesitter/textobj.lua
index 8ba20d793..a373e4146 100644
--- a/lua/nvim-treesitter/textobj.lua
+++ b/lua/nvim-treesitter/textobj.lua
@@ -4,54 +4,83 @@ local parsers = require'nvim-treesitter.parsers'
 local M = {}
 
 local function node_range_to_vim(node)
-  if node then
-    local start_row, start_col, end_row, end_col = node:range()
+  if not node then return end
 
-    return {{start_row, start_col}, {end_row, end_col}}
-  else
-    return {{}, {}}
-  end
+  local start_row, start_col, end_row, end_col = node:range()
+
+  local select_range = [[
+  call cursor(%d, %d)
+  normal v
+  call cursor(%d, %d)
+  ]]
+  local exec_command = string.format(select_range,
+    start_row+1, start_col+1,
+    end_row+1, end_col+1)
+
+  api.nvim_exec(exec_command, false)
 end
 
-function M.node_incremental()
-  local buf, sel_start_line, sel_start_col, _ = unpack(vim.fn.getpos("'<"))
-  local buf, sel_end_line, sel_end_col, _ = unpack(vim.fn.getpos("'>"))
+local function select_incremental(increment_func)
+  return function()
+    local buf, sel_start_line, sel_start_col, _ = unpack(vim.fn.getpos("'<"))
+    local buf, sel_end_line, sel_end_col, _ = unpack(vim.fn.getpos("'>"))
 
-  local node = nil
-  if parsers.has_parser() then
-    local root = parsers.get_parser():parse():root()
-    node = root:named_descendant_for_range(sel_start_line-1, sel_start_col-1, sel_end_line-1, sel_end_col)
-    local node_start_row, node_start_col, node_end_row, node_end_col = node:range()
+    local node = nil
+    if parsers.has_parser() then
+      local root = parsers.get_parser():parse():root()
+      node = root:named_descendant_for_range(sel_start_line-1, sel_start_col-1, sel_end_line-1, sel_end_col)
+      local node_start_row, node_start_col, node_end_row, node_end_col = node:range()
 
-    if (sel_start_line-1) == node_start_row and (sel_start_col-1) == node_start_col
-      and (sel_end_line-1) == node_end_row and sel_end_col == node_end_col then
-      -- TODO(vigoux): actually it is not really the parent here
-      -- it might be needed to climb more than only one parent, but a strictly growing node
-      node = node:parent() or node
+      if (sel_start_line-1) == node_start_row and (sel_start_col-1) == node_start_col
+        and (sel_end_line-1) == node_end_row and sel_end_col == node_end_col then
+        node = increment_func(node)
+      end
     end
-  end
 
-  return node_range_to_vim(node)
+    return node_range_to_vim(node)
+  end
 end
 
-function M.scope_incremental()
-  local _, sel_start_line, sel_start_col, _ = unpack(vim.fn.getpos("'<"))
-  local _, sel_end_line, sel_end_col, _ = unpack(vim.fn.getpos("'>"))
+M.node_incremental = select_incremental(function(node)
+  if node then
+    return node:parent() or node
+  end
+end)
 
-  local node = nil
-  if parsers.has_parser() then
-    local root = parsers.get_parser():parse():root()
-    node = utils.smallest_containing_scope(
-      root:named_descendant_for_range(sel_start_line-1, sel_start_col-1, sel_end_line-1, sel_end_col))
+M.scope_incremental = select_incremental(function(node)
+  if node then
+    return utils.smallest_containing_scope(node:parent() or node)
+  end
+end)
 
-    local node_start_row, node_start_col, node_end_row, node_end_col = node:range()
+function M.attach(bufnr)
+  local buf = bufnr or api.nvim_get_current_buf()
 
-    if (sel_start_line-1) == node_start_row and (sel_start_col-1) == node_start_col
-      and (sel_end_line-1) == node_end_row and sel_end_col == node_end_col then
-      node = utils.smallest_containing_scope(node:parent() or node)
-    end
+  local function textobj_create(mapping, funcname)
+    api.nvim_buf_set_keymap(buf, 'v', mapping,
+      string.format(":lua require'nvim-treesitter.textobj'.%s()<CR>", funcname), { silent = true })
+    api.nvim_buf_set_keymap(buf, 'o', mapping,
+      string.format(":normal v%s<CR>", mapping), { silent = true })
+  end
+
+  local config = require'nvim-treesitter.configs'.get_config().textobj
+  for funcname, mapping in pairs(config.keymaps) do
+    textobj_create(mapping, funcname)
+  end
+end
+
+function M.detach(bufnr)
+  local buf = bufnr or api.nvim_get_current_buf()
+
+  local function textobj_delete(mapping)
+    api.nvim_buf_del_keymap(buf, 'v', default_mapping)
+    api.nvim_buf_del_keymap(buf, 'o', default_mapping)
+  end
+
+  local config = require'nvim-treesitter.configs'.get_config().textobj
+  for _, mapping in pairs(config.keymaps) do
+    textobj_delete(mapping)
   end
-  return node_range_to_vim(node)
 end
 
 return M