Do not import fast_data_types at the top level of utility modules

kitty/cli.py

@@ -9,7 +9,6 @@ from collections import deque
 
 from .conf.utils import resolve_config
 from .constants import appname, defconf, is_macos, is_wayland, str_version
-from .fast_data_types import GLFW_KEY_UNKNOWN, glfw_get_key_name
 
 CONFIG_HELP = '''\
 Specify a path to the configuration file(s) to use. All configuration files are
@@ -641,6 +640,7 @@ def print_shortcut(key_sequence, action):
                 names.append(name)
         if key:
             if is_native:
+                from .fast_data_types import GLFW_KEY_UNKNOWN, glfw_get_key_name
                 names.append(glfw_get_key_name(GLFW_KEY_UNKNOWN, key))
             else:
                 names.append(krmap[key])

kitty/constants.py

@@ -7,7 +7,6 @@ import pwd
 import sys
 from collections import namedtuple
 
-from .fast_data_types import set_boss as set_c_boss
 
 appname = 'kitty'
 version = (0, 11, 3)
@@ -94,6 +93,7 @@ def get_boss():
 
 
 def set_boss(m):
+    from .fast_data_types import set_boss as set_c_boss
     get_boss.boss = m
     set_c_boss(m)
 

kitty/utils.py

@@ -15,16 +15,13 @@ from time import monotonic
 from .constants import (
     appname, is_macos, is_wayland, supports_primary_selection
 )
-from .fast_data_types import (
-    GLSL_VERSION, close_tty, log_error_string, open_tty, redirect_std_streams,
-    x11_display
-)
 from .rgb import Color, to_color
 
 BASE = os.path.dirname(os.path.abspath(__file__))
 
 
 def load_shaders(name):
+    from .fast_data_types import GLSL_VERSION
     vert = open(os.path.join(BASE, '{}_vertex.glsl'.format(name))).read().replace('GLSL_VERSION', str(GLSL_VERSION), 1)
     frag = open(os.path.join(BASE, '{}_fragment.glsl'.format(name))).read().replace('GLSL_VERSION', str(GLSL_VERSION), 1)
     return vert, frag
@@ -38,6 +35,7 @@ def safe_print(*a, **k):
 
 
 def log_error(*a, **k):
+    from .fast_data_types import log_error_string
     try:
         msg = k.get('sep', ' ').join(map(str, a)) + k.get('end', '')
         log_error_string(msg.replace('\0', ''))
@@ -180,6 +178,7 @@ def detach(fork=True, setsid=True, redirect=True):
     if setsid:
         os.setsid()
     if redirect:
+        from .fast_data_types import redirect_std_streams
         redirect_std_streams(os.devnull)
 
 
@@ -195,6 +194,7 @@ def init_startup_notification_x11(window_handle, startup_id=None):
     sid = startup_id or os.environ.pop('DESKTOP_STARTUP_ID', None)  # ensure child processes dont get this env var
     if not sid:
         return
+    from .fast_data_types import x11_display
     display = x11_display()
     if not display:
         return
@@ -369,10 +369,12 @@ def write_all(fd, data):
 class TTYIO:
 
     def __enter__(self):
+        from .fast_data_types import open_tty
         self.tty_fd, self.original_termios = open_tty(True)
         return self
 
     def __exit__(self, *a):
+        from .fast_data_types import close_tty
         close_tty(self.tty_fd, self.original_termios)
 
     def send(self, data):