improve hashtags

lib/auto_linker/builder.ex

@@ -125,16 +125,15 @@ defmodule AutoLinker.Builder do
     |> format_mention(name, opts)
   end
 
-  def create_hashtag_link(tag, _buffer, opts) do
+  def create_hashtag_link("#" <> tag, _buffer, opts) do
     hashtag_prefix = opts[:hashtag_prefix]
 
     url = hashtag_prefix <> tag
 
-    []
+    [href: url]
     |> build_attrs(url, opts, :rel)
     |> build_attrs(url, opts, :target)
     |> build_attrs(url, opts, :class)
-    |> build_attrs(url, opts, :scheme)
     |> format_hashtag(tag, opts)
   end
 

lib/auto_linker/parser.ex

@@ -45,7 +45,7 @@ defmodule AutoLinker.Parser do
   # https://www.w3.org/TR/html5/forms.html#valid-e-mail-address
   @match_email ~r/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/u
 
-  @match_hashtag ~r/^\#(?<tag>\w+)/u
+  @match_hashtag ~r/^(?<tag>\#\w+)/u
 
   @prefix_extra [
     "magnet:?",

test/auto_linker_test.exs

@@ -98,7 +98,7 @@ defmodule AutoLinkerTest do
       assert result_text ==
                "<a href=\"https://example.com/user/hello\">#hello</a> <a href=\"https://example.com/user/world\">#world</a>"
 
-      assert MapSet.to_list(tags) == ["hello", "world"]
+      assert MapSet.to_list(tags) == ["#hello", "#world"]
     end
   end