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diff --git a/gitstatus/src/options.h b/gitstatus/src/options.h
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+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_OPTIONS_H_
+#define ROMKATV_GITSTATUS_OPTIONS_H_
+
+#include <chrono>
+#include <string>
+
+#include "logging.h"
+#include "time.h"
+
+namespace gitstatus {
+
+struct Limits {
+  // Truncate commit summary if it's longer than this many bytes.
+  size_t max_commit_summary_length = 256;
+  // Report at most this many staged changes.
+  size_t max_num_staged = 1;
+  // Report at most this many unstaged changes.
+  size_t max_num_unstaged = 1;
+  // Report at most this many conflicted changes.
+  size_t max_num_conflicted = 1;
+  // Report at most this many untracked files.
+  size_t max_num_untracked = 1;
+  // If a repo has more files in its index than this, override max_num_unstaged and
+  // max_num_untracked (but not max_num_staged) with zeros.
+  size_t dirty_max_index_size = -1;
+  // If true, report untracked files like `git status --untracked-files`.
+  bool recurse_untracked_dirs = false;
+  // Unless true, report zero untracked files for repositories with
+  // status.showUntrackedFiles = false.
+  bool ignore_status_show_untracked_files = false;
+  // Unless true, report zero untracked files for repositories with
+  // bash.showUntrackedFiles = false.
+  bool ignore_bash_show_untracked_files = false;
+  // Unless true, report zero staged, unstaged and conflicted changes for repositories with
+  // bash.showDirtyState = false.
+  bool ignore_bash_show_dirty_state = false;
+};
+
+struct Options : Limits {
+  // Use this many threads to scan git workdir for unstaged and untracked files. Must be positive.
+  size_t num_threads = 1;
+  // If non-negative, check whether the specified file descriptor is locked when not receiving any
+  // requests for one second; exit if it isn't locked.
+  int lock_fd = -1;
+  // If non-negative, send signal 0 to the specified PID when not receiving any requests for one
+  // second; exit if signal sending fails.
+  int parent_pid = -1;
+  // Don't write entries to log whose log level is below this. Log levels in increasing order:
+  // DEBUG, INFO, WARN, ERROR, FATAL.
+  LogLevel log_level = INFO;
+  // Close git repositories that haven't been used for this long. This is meant to release resources
+  // such as memory and file descriptors. The next request for a repo that's been closed is much
+  // slower than for a repo that hasn't been. Negative value means infinity.
+  Duration repo_ttl = std::chrono::seconds(3600);
+};
+
+Options ParseOptions(int argc, char** argv);
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_OPTIONS_H_