allow using relative path in args

affects the following args:
[ file, sync-dir, file-basename, state-dir, cache-dir ]

peru/runtime.py

@@ -61,9 +61,13 @@ async def _init_cache(self):
  self.cache = await cache.Cache(self.cache_dir)
 
  def _set_paths(self, args, env):
- explicit_peru_file = args['--file']
- explicit_sync_dir = args['--sync-dir']
- explicit_basename = args['--file-basename']
+ explicit_peru_file = os.path.abspath(
+ args['--file']) if args['--file'] else None
+ explicit_sync_dir = os.path.abspath(
+ args['--sync-dir']) if args['--sync-dir'] else None
+ explicit_basename = os.path.abspath(
+ args['--file-basename']) if args['--file-basename'] else None
+
  if explicit_peru_file and explicit_basename:
  raise CommandLineError(
  'Cannot use both --file and --file-basename at the same time.')
@@ -77,15 +81,16 @@ def _set_paths(self, args, env):
  basename = explicit_basename or parser.DEFAULT_PERU_FILE_NAME
  self.peru_file = find_project_file(os.getcwd(), basename)
  self.sync_dir = explicit_sync_dir
-
  else:
  basename = explicit_basename or parser.DEFAULT_PERU_FILE_NAME
  self.peru_file = find_project_file(os.getcwd(), basename)
  self.sync_dir = os.path.dirname(self.peru_file)
- self.state_dir = (args['--state-dir']
- or os.path.join(self.sync_dir, '.peru'))
- self.cache_dir = (args['--cache-dir'] or env.get('PERU_CACHE_DIR')
- or os.path.join(self.state_dir, 'cache'))
+
+ self.state_dir = os.path.abspath(
+ args['--state-dir']) if args['--state-dir'] else os.path.join(self.sync_dir, '.peru')
+
+ self.cache_dir = os.path.abspath(
+ args['--cache-dir']) if args['--cache-dir'] else os.path.join(self.state_dir, 'cache')
 
  def tmp_dir(self):
  dir = tempfile.TemporaryDirectory(dir=self._tmp_root)