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diff --git a/src/view_helpers.hh b/src/view_helpers.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.
+ *
+ * @file view_helpers.hh
+ */
+
+#ifndef lnav_view_helpers_hh
+#define lnav_view_helpers_hh
+
+#include "bookmarks.hh"
+#include "help_text.hh"
+#include "logfile_fwd.hh"
+#include "vis_line.hh"
+
+class textview_curses;
+class hist_source2;
+class logfile_sub_source;
+
+/** The different views available. */
+typedef enum {
+    LNV_LOG,
+    LNV_TEXT,
+    LNV_HELP,
+    LNV_HISTOGRAM,
+    LNV_DB,
+    LNV_SCHEMA,
+    LNV_PRETTY,
+    LNV_SPECTRO,
+
+    LNV__MAX
+} lnav_view_t;
+
+/** The command modes that are available while viewing a file. */
+enum class ln_mode_t : int {
+    PAGING,
+    BREADCRUMBS,
+    FILTER,
+    FILES,
+    SPECTRO_DETAILS,
+    SEARCH_SPECTRO_DETAILS,
+    COMMAND,
+    SEARCH,
+    SEARCH_FILTERS,
+    SEARCH_FILES,
+    CAPTURE,
+    SQL,
+    EXEC,
+    USER,
+    BUSY,
+};
+
+extern const char* lnav_view_strings[LNV__MAX + 1];
+extern const char* lnav_view_titles[LNV__MAX];
+
+nonstd::optional<lnav_view_t> view_from_string(const char* name);
+
+bool ensure_view(textview_curses* expected_tc);
+bool ensure_view(lnav_view_t expected);
+bool toggle_view(textview_curses* toggle_tc);
+bool handle_winch();
+void layout_views();
+void update_hits(textview_curses* tc);
+
+nonstd::optional<vis_line_t> next_cluster(
+    nonstd::optional<vis_line_t> (bookmark_vector<vis_line_t>::*f)(vis_line_t)
+        const,
+    const bookmark_type_t* bt,
+    vis_line_t top);
+bool moveto_cluster(nonstd::optional<vis_line_t> (
+                        bookmark_vector<vis_line_t>::*f)(vis_line_t) const,
+                    const bookmark_type_t* bt,
+                    vis_line_t top);
+void previous_cluster(const bookmark_type_t* bt, textview_curses* tc);
+vis_line_t search_forward_from(textview_curses* tc);
+textview_curses* get_textview_for_mode(ln_mode_t mode);
+
+#endif