textobj: add incremental node selection

autoload/nvim_treesitter.vim

@@ -0,0 +1,16 @@
+function! s:visual_node(node_range)
+  let [l:cursor_start, l:cursor_end] = a:node_range
+  if !empty(l:cursor_start) && !empty(l:cursor_end)
+    call cursor(l:cursor_start[0]+1, l:cursor_start[1]+1)
+    normal v
+    call cursor(l:cursor_end[0]+1, l:cursor_end[1])
+  endif
+endfunction
+
+function! nvim_treesitter#select_node_incr()
+  call s:visual_node(luaeval('require"nvim-treesitter.textobj".node_incremental()'))
+endfunction
+
+function! nvim_treesitter#select_context_incr()
+  call s:visual_node(luaeval('require"nvim-treesitter.textobj".context_incremental()'))
+endfunction

lua/nvim-treesitter/locals.lua

@@ -68,8 +68,8 @@ function M.get_definitions(bufnr)
   local defs = {}
 
   for _, loc in ipairs(locals) do
-    if loc.definition then
-      table.insert(defs, {definition=loc.definition, kind=loc.kind})
+    if loc.definition and loc.definition.node then
+      table.insert(defs, {node=loc.definition.node, kind=loc.kind})
     end
   end
 
@@ -82,8 +82,8 @@ function M.get_scopes(bufnr)
   local scopes = {}
 
   for _, loc in ipairs(locals) do
-    if loc.scope then
-      table.insert(scopes, loc.scope)
+    if loc.scope and loc.scope.node then
+      table.insert(scopes, loc.scope.node)
     end
   end
 
@@ -96,8 +96,8 @@ function M.get_references(bufnr)
   local refs = {}
 
   for _, loc in ipairs(locals) do
-    if loc.reference then
-      table.insert(refs, loc.reference)
+    if loc.reference and loc.reference.node then
+      table.insert(refs, loc.reference.node)
     end
   end
 

lua/nvim-treesitter/textobj.lua

@@ -0,0 +1,36 @@
+local api = vim.api
+local utils = require'nvim-treesitter.utils'
+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()
+
+    return {{start_row, start_col}, {end_row, end_col}}
+  else
+    return {{}, {}}
+  end
+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("'>"))
+
+  if parsers.has_parser() then
+    local root = parsers.get_parser():parse():root()
+    local 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
+      return node_range_to_vim(node:parent() or node)
+    else
+      return node_range_to_vim(node)
+    end
+  else
+    return node_range_to_vim()
+  end
+end
+
+return M