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diff --git a/src/file_collection.hh b/src/file_collection.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 file_collection.hh
+ */
+
+#ifndef lnav_file_collection_hh
+#define lnav_file_collection_hh
+
+#include <forward_list>
+#include <list>
+#include <map>
+#include <set>
+#include <string>
+#include <utility>
+
+#include "archive_manager.hh"
+#include "base/future_util.hh"
+#include "file_format.hh"
+#include "logfile_fwd.hh"
+#include "safe/safe.h"
+#include "tailer/tailer.looper.hh"
+
+struct tailer_progress {
+    std::string tp_message;
+};
+
+struct scan_progress {
+    std::list<archive_manager::extract_progress> sp_extractions;
+    std::map<std::string, tailer_progress> sp_tailers;
+};
+
+using safe_scan_progress = safe::Safe<scan_progress>;
+
+struct other_file_descriptor {
+    file_format_t ofd_format;
+    std::string ofd_description;
+
+    other_file_descriptor(file_format_t format = file_format_t::UNKNOWN,
+                          std::string description = "")
+        : ofd_format(format), ofd_description(std::move(description))
+    {
+    }
+};
+
+struct file_error_info {
+    const time_t fei_mtime;
+    const std::string fei_description;
+};
+
+struct file_collection;
+
+enum class child_poll_result_t {
+    ALIVE,
+    FINISHED,
+};
+
+class child_poller {
+public:
+    explicit child_poller(
+        auto_pid<process_state::running> child,
+        std::function<void(file_collection&,
+                           auto_pid<process_state::finished>&)> finalizer)
+        : cp_child(std::move(child)), cp_finalizer(std::move(finalizer))
+    {
+        ensure(this->cp_finalizer);
+    }
+
+    child_poller(child_poller&& other) noexcept
+        : cp_child(std::move(other.cp_child)),
+          cp_finalizer(std::move(other.cp_finalizer))
+    {
+        ensure(this->cp_finalizer);
+    }
+
+    child_poller& operator=(child_poller&& other) noexcept
+    {
+        require(other.cp_finalizer);
+
+        this->cp_child = std::move(other.cp_child);
+        this->cp_finalizer = std::move(other.cp_finalizer);
+
+        return *this;
+    }
+
+    ~child_poller() noexcept = default;
+
+    child_poller(const child_poller&) = delete;
+
+    child_poller& operator=(const child_poller&) = delete;
+
+    child_poll_result_t poll(file_collection& fc);
+
+private:
+    nonstd::optional<auto_pid<process_state::running>> cp_child;
+    std::function<void(file_collection&, auto_pid<process_state::finished>&)>
+        cp_finalizer;
+};
+
+struct file_collection {
+    bool fc_invalidate_merge{false};
+
+    bool fc_recursive{false};
+    bool fc_rotated{false};
+
+    std::map<std::string, file_error_info> fc_name_to_errors;
+    std::map<std::string, logfile_open_options> fc_file_names;
+    std::vector<std::shared_ptr<logfile>> fc_files;
+    int fc_files_generation{0};
+    std::vector<std::pair<std::shared_ptr<logfile>, std::string>>
+        fc_renamed_files;
+    std::set<std::string> fc_closed_files;
+    std::map<std::string, other_file_descriptor> fc_other_files;
+    std::set<std::string> fc_synced_files;
+    std::shared_ptr<safe_scan_progress> fc_progress;
+    std::vector<struct stat> fc_new_stats;
+    std::list<child_poller> fc_child_pollers;
+    size_t fc_largest_path_length{0};
+
+    file_collection()
+        : fc_progress(std::make_shared<safe::Safe<scan_progress>>())
+    {
+    }
+
+    void clear()
+    {
+        this->fc_name_to_errors.clear();
+        this->fc_file_names.clear();
+        this->fc_files.clear();
+        this->fc_closed_files.clear();
+        this->fc_other_files.clear();
+        this->fc_new_stats.clear();
+    }
+
+    file_collection rescan_files(bool required = false);
+
+    void expand_filename(lnav::futures::future_queue<file_collection>& fq,
+                         const std::string& path,
+                         logfile_open_options& loo,
+                         bool required);
+
+    std::future<file_collection> watch_logfile(const std::string& filename,
+                                               logfile_open_options& loo,
+                                               bool required);
+
+    void merge(file_collection& other);
+
+    void request_close(const std::shared_ptr<logfile>& lf);
+
+    void close_files(const std::vector<std::shared_ptr<logfile>>& files);
+
+    void regenerate_unique_file_names();
+};
+
+#endif