Make --accept-nth and --with-nth support templates

test/test_core.rb

@@ -1772,4 +1772,13 @@ class TestCore < TestInteractive
       assert_equal ['bar,bar,foo  :,:bazfoo'], File.readlines(tempname, chomp: true)
     end
   end
+
+  def test_accept_nth_template
+    tmux.send_keys %(echo "foo  ,bar,baz" | #{FZF} -d, --accept-nth '1st: {1}, 3rd: {3}, 2nd: {2}' --sync --bind start:accept > #{tempname}), :Enter
+    wait do
+      assert_path_exists tempname
+      # Last delimiter and the whitespaces are removed
+      assert_equal ['1st: foo, 3rd: baz, 2nd: bar'], File.readlines(tempname, chomp: true)
+    end
+  end
 end

test/test_filter.rb

@@ -59,6 +59,13 @@ class TestFilter < TestBase
       `#{FZF} -f"^he hehe" -x -n 2.. --with-nth 2,1,1 < #{tempname}`.chomp
   end
 
+  def test_with_nth_template
+    writelines(['hello world ', 'byebye'])
+    assert_equal \
+      'hello world ',
+      `#{FZF} -f"^he he.he." -x -n 2.. --with-nth '{2} {1}. {1}.' < #{tempname}`.chomp
+  end
+
   def test_with_nth_ansi
     writelines(["\x1b[33mhello \x1b[34;1mworld\x1b[m ", 'byebye'])
     assert_equal \