diff --git a/arguments.py b/arguments.py
new file mode 100644
index 0000000..fa40f7e
--- /dev/null
+++ b/arguments.py
@@ -0,0 +1,82 @@
+import argparse
+import os
+
+
+ACTION = 'action'
+ARCHITECTURES = 'architectures'
+COMPRESSION = 'compression'
+DIRECTORY = 'directory'
+FILESYSTEM = 'filesystem'
+REMOTE = 'remote'
+SUBSYSTEMS = 'subsystems'
+TEMPORARY = 'temporary'
+THREADS = 'threads'
+VERBOSE = 'verbose'
+
+
+class Formatter(argparse.RawTextHelpFormatter,
+                argparse.ArgumentDefaultsHelpFormatter):
+    pass
+
+
+def parse():
+    parser = argparse.ArgumentParser(formatter_class=Formatter)
+
+    parser.add_argument(f'-{VERBOSE[0]}', f'--{VERBOSE}', type=bool, help='''\
+verbose output
+''')
+
+    parser.add_argument(f'-{DIRECTORY[0]}', f'--{DIRECTORY}', type=str,
+                        help='''\
+msys repository's directory
+''')
+    parser.add_argument(f'--{TEMPORARY}', type=str, help='''\
+msys repository's temporary directory
+''')
+    parser.add_argument(f'-{THREADS[0]}', f'--{THREADS}', type=int, help='''\
+number of threads to use
+''')
+    parser.add_argument(f'{ACTION}', type=str, nargs='?',
+                        choices=['build', 'check', 'info', 'sync'], help='''\
+action to perform onto msys repository
+''')
+
+    sync = parser.add_argument_group('sync')
+    sync.add_argument(f'-{REMOTE[0]}', f'--{REMOTE}', type=str, help='''\
+msys remote repository's location
+''')
+    sync.add_argument(f'-{ARCHITECTURES[0]}', f'--{ARCHITECTURES}', type=str,
+                      nargs='+', choices=['x86_64', 'i686'], help='''\
+list of architectures to sync
+''')
+    sync.add_argument(f'-{SUBSYSTEMS[0]}', f'--{SUBSYSTEMS}', type=str,
+                      nargs='+', choices=['msys', 'mingw'], help='''\
+list of subsystems to sync
+''')
+
+    build = parser.add_argument_group('build')
+    parser.add_argument(f'-{FILESYSTEM[0]}', f'--{FILESYSTEM}', type=str,
+                        help='''\
+directory containing modifications applying to filesystem
+''')
+    build.add_argument(f'-{COMPRESSION[0]}', f'--{COMPRESSION}', type=str,
+                       choices=['7z', 'gz', 'xz', 'zst'], help='''\
+compression applying to archive
+''')
+
+    parser.set_defaults(
+        directory=os.curdir,
+        temporary='tmp',
+        threads=2,
+
+        action='info',
+
+        remote='https://repo.msys2.org',
+        architectures=['x86_64'],
+        subsystems=['msys', 'mingw'],
+
+        filesystem='fs',
+        compression='7z',
+    )
+
+    return vars(parser.parse_args())