Query: allow to pass a list to get_capture_matches (#1693)

lua/nvim-treesitter/query.lua

@@ -195,22 +195,35 @@ end
 
 --- Return all nodes corresponding to a specific capture path (like @definition.var, @reference.type)
 -- Works like M.get_references or M.get_scopes except you can choose the capture
--- Can also be a nested capture like @definition.function to get all nodes defining a function
+-- Can also be a nested capture like @definition.function to get all nodes defining a function.
-function M.get_capture_matches(bufnr, capture_string, query_group, root, lang)
+--
-  if not string.sub(capture_string, 1, 1) == "@" then
+-- @param bufnr the buffer
-    print 'capture_string must start with "@"'
+-- @param captures a single string or a list of strings
-    return
+-- @param query_group the name of query group (highlights or injections for example)
+-- @param root (optional) node from where to start the search
+-- @param lang (optional) the language from where to get the captures.
+--             Root nodes can have several languages.
+function M.get_capture_matches(bufnr, captures, query_group, root, lang)
+  if type(captures) == "string" then
+    captures = { captures }
+  end
+  local strip_captures = {}
+  for i, capture in ipairs(captures) do
+    if not capture:sub(1, 1) == "@" then
+      error 'Captures must start with "@"'
+      return
+    end
+    -- Remove leading "@".
+    strip_captures[i] = capture:sub(2)
   end
-
-  --remove leading "@"
-  capture_string = string.sub(capture_string, 2)
 
   local matches = {}
   for match in M.iter_group_results(bufnr, query_group, root, lang) do
-    local insert = utils.get_at_path(match, capture_string)
+    for _, capture in ipairs(strip_captures) do
-
+      local insert = utils.get_at_path(match, capture)
-    if insert then
+      if insert then
-      table.insert(matches, insert)
+        table.insert(matches, insert)
+      end
     end
   end
   return matches