add statusline option to dedupe or not

doc/nvim-treesitter.txt

@@ -446,7 +446,8 @@ Default options (lua syntax):
     indicator_size = 100,
     type_patterns = {'class', 'function', 'method'},
     transform_fn = function(line, _node) return line:gsub('%s*[%[%(%{]*%s*$', '') end,
-    separator = ' -> '
+    separator = ' -> ',
+    dedupe = true
   }
 <
 - `indicator_size` - How long should the string be. If longer, it is cut from
@@ -456,6 +457,7 @@ Default options (lua syntax):
   default removes opening brackets and spaces from end. Takes two arguments:
   the text of the line in question, and the corresponding treesitter node.
 - `separator` - Separator between nodes.
+- `dedupe` - Whether or not to remove duplicate components.
 
 						  *nvim_treesitter#foldexpr()*
 nvim_treesitter#foldexpr()~

lua/nvim-treesitter/statusline.lua

@@ -21,6 +21,10 @@ function M.statusline(opts)
   local type_patterns = options.type_patterns or { "class", "function", "method" }
   local transform_fn = options.transform_fn or transform_line
   local separator = options.separator or " -> "
+  local dedupe = options.dedupe
+  if dedupe == nil then
+    dedupe = true
+  end
 
   local current_node = ts_utils.get_node_at_cursor()
   if not current_node then
@@ -32,8 +36,10 @@ function M.statusline(opts)
 
   while expr do
     local line = ts_utils._get_line_for_node(expr, type_patterns, transform_fn, bufnr)
-    if line ~= "" and not vim.tbl_contains(lines, line) then
-      table.insert(lines, 1, line)
+    if line ~= "" then
+      if not dedupe or not vim.tbl_contains(lines, line) then
+        table.insert(lines, 1, line)
+      end
     end
     expr = expr:parent()
   end