Expose a config_changed signal to extensions

1 files changed, 23 insertions, 1 deletions

diff --git a/qutebrowser/extensions/loader.py b/qutebrowser/extensions/loader.py
index 303eda213..e7b93967b 100644
--- a/qutebrowser/extensions/loader.py
+++ b/qutebrowser/extensions/loader.py
@@ -28,7 +28,10 @@ import pathlib
 
 import attr
 
+from PyQt5.QtCore import pyqtSignal, QObject
+
 from qutebrowser import components
+from qutebrowser.config import config
 from qutebrowser.utils import log, standarddir, objreg
 
 
@@ -40,6 +43,14 @@ class InitContext:
     data_dir = attr.ib()  # type: pathlib.Path
     config_dir = attr.ib()  # type: pathlib.Path
     args = attr.ib()  # type: argparse.Namespace
+    signals = attr.ib()  # type: ExtensionSignals
+
+
+class ExtensionSignals(QObject):
+
+    """Signals exposed to an extension."""
+
+    config_changed = pyqtSignal(str)
 
 
 @attr.s
@@ -61,6 +72,12 @@ class ExtensionInfo:
     name = attr.ib()  # type: str
 
 
+# Global extension signals, shared between all extensions.
+# At some point we might want to make this per-extension, but then we'll need
+# to find out what to set as its Qt parent so it's kept alive.
+_extension_signals = ExtensionSignals()
+
+
 def add_module_info(module: types.ModuleType) -> ModuleInfo:
     """Add ModuleInfo to a module (if not added yet)."""
     # pylint: disable=protected-access
@@ -121,7 +138,8 @@ def _get_init_context() -> InitContext:
     """Get an InitContext object."""
     return InitContext(data_dir=pathlib.Path(standarddir.data()),
                        config_dir=pathlib.Path(standarddir.config()),
-                       args=objreg.get('args'))
+                       args=objreg.get('args'),
+                       signals=_extension_signals)
 
 
 def _load_component(info: ExtensionInfo) -> types.ModuleType:
@@ -136,3 +154,7 @@ def _load_component(info: ExtensionInfo) -> types.ModuleType:
         mod_info.init_hook(_get_init_context())
 
     return mod
+
+
+def init() -> None:
+    config.instance.changed.connect(_extension_signals.config_changed)