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diff --git a/src/field_overlay_source.hh b/src/field_overlay_source.hh
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+/**
+ * Copyright (c) 2015, 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 LNAV_FIELD_OVERLAY_SOURCE_H
+#define LNAV_FIELD_OVERLAY_SOURCE_H
+
+#include <utility>
+#include <vector>
+
+#include "listview_curses.hh"
+#include "log_data_helper.hh"
+#include "logfile_sub_source.hh"
+#include "textfile_sub_source.hh"
+
+class field_overlay_source : public list_overlay_source {
+public:
+    explicit field_overlay_source(logfile_sub_source& lss,
+                                  textfile_sub_source& tss)
+        : fos_lss(lss), fos_tss(tss), fos_log_helper(lss)
+    {
+    }
+
+    void add_key_line_attrs(int key_size, bool last_line = false);
+
+    bool list_value_for_overlay(const listview_curses& lv,
+                                int y,
+                                int bottom,
+                                vis_line_t row,
+                                attr_line_t& value_out) override;
+
+    void build_field_lines(const listview_curses& lv);
+    void build_meta_line(const listview_curses& lv,
+                         std::vector<attr_line_t>& dst,
+                         vis_line_t row);
+
+    struct context {
+        context(std::string prefix, bool show, bool show_discovered)
+            : c_prefix(std::move(prefix)), c_show(show),
+              c_show_discovered(show_discovered)
+        {
+        }
+
+        std::string c_prefix;
+        bool c_show{false};
+        bool c_show_discovered{true};
+    };
+
+    bool fos_show_status{true};
+    std::stack<context> fos_contexts;
+    logfile_sub_source& fos_lss;
+    textfile_sub_source& fos_tss;
+    log_data_helper fos_log_helper;
+    int fos_known_key_size{0};
+    int fos_unknown_key_size{0};
+    std::vector<attr_line_t> fos_lines;
+    vis_line_t fos_meta_lines_row{0_vl};
+    std::vector<attr_line_t> fos_meta_lines;
+};
+
+#endif  // LNAV_FIELD_OVERLAY_SOURCE_H