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diff --git a/src/logfile_fwd.hh b/src/logfile_fwd.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 logfile_fwd.hh
+ */
+
+#ifndef lnav_logfile_fwd_hh
+#define lnav_logfile_fwd_hh
+
+#include <chrono>
+#include <string>
+
+#include "base/auto_fd.hh"
+#include "file_format.hh"
+
+using ui_clock = std::chrono::steady_clock;
+
+class logfile;
+class logline;
+class logline_observer;
+
+using logfile_const_iterator = std::vector<logline>::const_iterator;
+
+enum class logfile_name_source {
+    USER,
+    ARCHIVE,
+    REMOTE,
+};
+
+struct logfile_open_options_base {
+    std::string loo_filename;
+    logfile_name_source loo_source{logfile_name_source::USER};
+    bool loo_temp_file{false};
+    dev_t loo_temp_dev{0};
+    ino_t loo_temp_ino{0};
+    bool loo_detect_format{true};
+    bool loo_include_in_session{true};
+    bool loo_is_visible{true};
+    bool loo_non_utf_is_visible{true};
+    ssize_t loo_visible_size_limit{-1};
+    bool loo_tail{true};
+    file_format_t loo_file_format{file_format_t::UNKNOWN};
+};
+
+struct logfile_open_options : public logfile_open_options_base {
+    logfile_open_options() = default;
+
+    explicit logfile_open_options(const logfile_open_options_base& base)
+        : logfile_open_options_base(base)
+    {
+    }
+
+    logfile_open_options& with_filename(const std::string& val)
+    {
+        this->loo_filename = val;
+
+        return *this;
+    }
+
+    logfile_open_options& with_fd(auto_fd fd)
+    {
+        this->loo_fd = std::move(fd);
+        this->loo_temp_file = true;
+
+        return *this;
+    }
+
+    logfile_open_options& with_stat_for_temp(const struct stat& st)
+    {
+        this->loo_temp_dev = st.st_dev;
+        this->loo_temp_ino = st.st_ino;
+
+        return *this;
+    }
+
+    logfile_open_options& with_source(logfile_name_source src)
+    {
+        this->loo_source = src;
+
+        return *this;
+    }
+
+    logfile_open_options& with_detect_format(bool val)
+    {
+        this->loo_detect_format = val;
+
+        return *this;
+    }
+
+    logfile_open_options& with_include_in_session(bool val)
+    {
+        this->loo_include_in_session = val;
+
+        return *this;
+    };
+
+    logfile_open_options& with_visibility(bool val)
+    {
+        this->loo_is_visible = val;
+
+        return *this;
+    }
+
+    logfile_open_options& with_non_utf_visibility(bool val)
+    {
+        this->loo_non_utf_is_visible = val;
+
+        return *this;
+    };
+
+    logfile_open_options& with_visible_size_limit(ssize_t val)
+    {
+        this->loo_visible_size_limit = val;
+
+        return *this;
+    }
+
+    logfile_open_options& with_tail(bool val)
+    {
+        this->loo_tail = val;
+
+        return *this;
+    }
+
+    logfile_open_options& with_file_format(file_format_t ff)
+    {
+        this->loo_file_format = ff;
+
+        return *this;
+    }
+
+    auto_fd loo_fd;
+};
+
+#endif