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diff --git a/src/files_sub_source.hh b/src/files_sub_source.hh
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+/**
+ * Copyright (c) 2020, 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 files_sub_source_hh
+#define files_sub_source_hh
+
+#include "file_collection.hh"
+#include "textview_curses.hh"
+
+class files_sub_source
+    : public text_sub_source
+    , public list_input_delegate {
+public:
+    files_sub_source();
+
+    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;
+
+    size_t fss_last_line_len{0};
+};
+
+struct files_overlay_source : public list_overlay_source {
+    bool list_value_for_overlay(const listview_curses& lv,
+                                int y,
+                                int bottom,
+                                vis_line_t line,
+                                attr_line_t& value_out) override;
+};
+
+namespace files_model {
+
+struct no_selection {
+};
+
+template<typename C, typename T>
+struct selection_base {
+    int sb_index{0};
+    T sb_iter;
+
+    static C build(int index, T iter)
+    {
+        C retval;
+
+        retval.sb_index = index;
+        retval.sb_iter = iter;
+        return retval;
+    }
+};
+
+struct error_selection
+    : public selection_base<error_selection,
+                            std::map<std::string, file_error_info>::iterator> {
+};
+
+struct other_selection
+    : public selection_base<
+          other_selection,
+          std::map<std::string, other_file_descriptor>::iterator> {
+};
+
+struct file_selection
+    : public selection_base<file_selection,
+                            std::vector<std::shared_ptr<logfile>>::iterator> {
+};
+
+using files_list_selection = mapbox::util::
+    variant<no_selection, error_selection, other_selection, file_selection>;
+
+files_list_selection from_selection(vis_line_t sel_vis);
+
+}  // namespace files_model
+
+#endif