Remove unused extract_headers

Author: josevalim

lib/ex_doc/doc_ast.ex

@@ -109,19 +109,6 @@ defmodule ExDoc.DocAST do
   def extract_title([{:h1, _attrs, inner, _meta} | ast]), do: {:ok, inner, ast}
   def extract_title(_ast), do: :error
 
-  @doc """
-  Extracts headers (h2) from the given AST.
-
-  Returns the header text.
-  """
-  def extract_headers(doc_ast, headers) do
-    for {tag, _, _, _} = node <- doc_ast,
-        tag in headers,
-        text = ExDoc.DocAST.text(node),
-        text != "",
-        do: text
-  end
-
   @doc """
   Extracts the headers which have anchors (aka ids) in them.
   """

test/ex_doc/doc_ast_test.exs

@@ -131,31 +131,6 @@ defmodule ExDoc.DocASTTest do
     end
   end
 
-  describe "extract_headers" do
-    test "extracts h2 headers" do
-      assert extract_headers("""
-             # h1
-             ## h2-a
-             ### h3
-             ## h2-b
-             ##
-             """) == ["h2-a", "h2-b"]
-    end
-
-    test "trims whitespace and preserve HTML entities" do
-      assert extract_headers("""
-             # h1
-             ##\s\s\s**h2**\s<&>\s`h2`\s\s\s
-             """) == ["h2 <&> h2"]
-    end
-
-    defp extract_headers(markdown) do
-      markdown
-      |> DocAST.parse!("text/markdown")
-      |> DocAST.extract_headers([:h2])
-    end
-  end
-
   describe "headers" do
     test "adds and extracts anchored headers" do
       assert """