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diff --git a/src/filter_sub_source.hh b/src/filter_sub_source.hh
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+/**
+ * Copyright (c) 2018, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef filter_sub_source_hh
+#define filter_sub_source_hh
+
+#include "base/injector.hh"
+#include "plain_text_source.hh"
+#include "readline_curses.hh"
+#include "textview_curses.hh"
+
+class filter_sub_source
+    : public text_sub_source
+    , public list_input_delegate {
+public:
+    filter_sub_source(std::shared_ptr<readline_curses> editor);
+
+    using injectable
+        = filter_sub_source(std::shared_ptr<readline_curses> editor);
+
+    filter_sub_source(const filter_sub_source*) = delete;
+
+    ~filter_sub_source() override = default;
+
+    bool list_input_handle_key(listview_curses& lv, int ch) override;
+
+    void list_input_handle_scroll_out(listview_curses& lv) override;
+
+    size_t text_line_count() override;
+
+    size_t text_line_width(textview_curses& curses) override;
+
+    void text_value_for_line(textview_curses& tc,
+                             int line,
+                             std::string& value_out,
+                             line_flags_t flags) override;
+
+    void text_attrs_for_line(textview_curses& tc,
+                             int line,
+                             string_attrs_t& value_out) override;
+
+    size_t text_size_for_line(textview_curses& tc,
+                              int line,
+                              line_flags_t raw) override;
+
+    void rl_change(readline_curses* rc);
+
+    void rl_perform(readline_curses* rc);
+
+    void rl_abort(readline_curses* rc);
+
+    void rl_display_matches(readline_curses* rc);
+
+    void rl_display_next(readline_curses* rc);
+
+    readline_context fss_regex_context{"filter-regex", nullptr, false};
+    readline_context fss_sql_context{"filter-sql", nullptr, false};
+    std::shared_ptr<readline_curses> fss_editor;
+    plain_text_source fss_match_source;
+    textview_curses fss_match_view;
+
+    bool fss_editing{false};
+    bool fss_filter_state{false};
+};
+
+#endif