refactor(treesitter): rename x_position => x_pos

"pos" has a long precedent as "position" in vim, and there is no reason
to use a verbose name here.

runtime/doc/develop.txt

@@ -251,6 +251,12 @@ Use existing common {action} names if possible:
     list    Get all things
     set     Set a thing (or group of things)
 
+Use existing common {thing} names if possible:
+    buf     Buffer
+    pos     Position
+    tab     Tabpage
+    win     Window
+
 Use consistent names for {thing} in all API functions. E.g. a buffer is called
 "buf" everywhere, not "buffer" in some places and "buf" in others.
 

runtime/doc/treesitter.txt

@@ -434,8 +434,7 @@ get_captures_at_cursor({winnr})                     *get_captures_at_cursor()*
     Return: ~
         string[] List of capture names
 
-                                                  *get_captures_at_position()*
-get_captures_at_position({bufnr}, {row}, {col})
+get_captures_at_pos({bufnr}, {row}, {col})             *get_captures_at_pos()*
     Returns a list of highlight captures at the given position
 
     Each capture is represented by a table containing the capture name as a
@@ -460,8 +459,7 @@ get_node_at_cursor({winnr})                             *get_node_at_cursor()*
     Return: ~
         (string) Name of node under the cursor
 
-                                                      *get_node_at_position()*
-get_node_at_position({bufnr}, {row}, {col}, {opts})
+get_node_at_pos({bufnr}, {row}, {col}, {opts})             *get_node_at_pos()*
     Returns the smallest named node at the given position
 
     Parameters: ~

runtime/lua/vim/treesitter.lua

@@ -202,7 +202,7 @@ end
 ---@param col number Position column
 ---
 ---@return table[] List of captures `{ capture = "capture name", metadata = { ... } }`
-function M.get_captures_at_position(bufnr, row, col)
+function M.get_captures_at_pos(bufnr, row, col)
   if bufnr == 0 then
     bufnr = a.nvim_get_current_buf()
   end
@@ -258,7 +258,7 @@ function M.get_captures_at_cursor(winnr)
   local bufnr = a.nvim_win_get_buf(winnr)
   local cursor = a.nvim_win_get_cursor(winnr)
 
-  local data = M.get_captures_at_position(bufnr, cursor[1] - 1, cursor[2])
+  local data = M.get_captures_at_pos(bufnr, cursor[1] - 1, cursor[2])
 
   local captures = {}
 
@@ -278,7 +278,7 @@ end
 ---             - ignore_injections boolean Ignore injected languages (default true)
 ---
 ---@return userdata |tsnode| under the cursor
-function M.get_node_at_position(bufnr, row, col, opts)
+function M.get_node_at_pos(bufnr, row, col, opts)
   if bufnr == 0 then
     bufnr = a.nvim_get_current_buf()
   end
@@ -302,8 +302,7 @@ function M.get_node_at_cursor(winnr)
   local bufnr = a.nvim_win_get_buf(winnr)
   local cursor = a.nvim_win_get_cursor(winnr)
 
-  return M.get_node_at_position(bufnr, cursor[1] - 1, cursor[2], { ignore_injections = false })
-    :type()
+  return M.get_node_at_pos(bufnr, cursor[1] - 1, cursor[2], { ignore_injections = false }):type()
 end
 
 --- Starts treesitter highlighting for a buffer

test/functional/treesitter/highlight_spec.lua

@@ -607,7 +607,7 @@ describe('treesitter highlighting', function()
     eq({
       {capture='Error', metadata = { priority='101' }};
       {capture='type', metadata = { } };
-    }, exec_lua [[ return vim.treesitter.get_captures_at_position(0, 0, 2) ]])
+    }, exec_lua [[ return vim.treesitter.get_captures_at_pos(0, 0, 2) ]])
     end)
 
   it("allows to use captures with dots (don't use fallback when specialization of foo exists)", function()