fix(directive): make downcase work on captures

lua/nvim-treesitter/query_predicates.lua

@@ -178,37 +178,25 @@ end, true)
 -- Just avoid some annoying warnings for this directive
 query.add_directive("make-range!", function() end, true)
 
+--- transform node text to lower case (e.g., to make @injection.language case insensitive)
+---
 ---@param match (TSNode|nil)[]
 ---@param _ string
 ---@param bufnr integer
 ---@param pred string[]
----@param metadata table
 ---@return boolean|nil
 query.add_directive("downcase!", function(match, _, bufnr, pred, metadata)
-  local text, key, value ---@type string|string[], string, string|integer
-
-  if #pred == 3 then
-    -- (#downcase! @capture "key")
-    key = pred[3]
-    value = metadata[pred[2]][key]
-  else
-    -- (#downcase! "key")
-    key = pred[2]
-    value = metadata[key]
+  local id = pred[2]
+  local node = match[id]
+  if not node then
+    return
   end
 
-  if type(value) == "string" then
-    text = value
-  else
-    local node = match[value]
-    text = vim.treesitter.get_node_text(node, bufnr) or ""
-  end
-
-  if #pred == 3 then
-    metadata[pred[2]][key] = string.lower(text)
-  else
-    metadata[key] = string.lower(text)
+  local text = vim.treesitter.get_node_text(node, bufnr, { metadata = metadata[id] }) or ""
+  if not metadata[id] then
+    metadata[id] = {}
   end
+  metadata[id].text = string.lower(text)
 end, true)
 
 -- Trim blank lines from end of the region

queries/awk/injections.scm

@@ -3,10 +3,3 @@
 
 ((regex) @injection.content
  (#set! injection.language "regex"))
-
-((redirected_statement
-   (heredoc_redirect
-     (heredoc_start) @injection.language))
- (heredoc_body) @injection.content
- (#offset! @injection.content 0 0 -1 0)
- (#downcase! @injection.language))

queries/ruby/injections.scm

@@ -4,8 +4,7 @@
 (heredoc_body
  (heredoc_content) @injection.content
  (heredoc_end) @injection.language
- (#set! "language" @injection.language)
- (#downcase! "language"))
+ (#downcase! @injection.language))
 
 (regex 
   (string_content) @injection.content