rules: only use X11 code when X11 is available

docs/installation.md

@@ -20,20 +20,17 @@ and `hid-logitech-hidpp` loaded. Also, the `udev` package must be installed
 and its daemon running. If you have a recent Linux distribution, you are
 most likely good to go.
 
-Solaar requires Python 3.6+
-and the `python3-pyudev` package.
-To run the GUI Solaar also requires Gtk3, its GObject
-introspection bindings.
+Solaar requires Python 3.6+ and the
+`python3-pyudev` package.
+The Solaar GUI requires the
+`python3-psutil`, `python3-xlib`, and `python3-pyyaml` packages.
+To run the GUI Solaar also requires Gtk3 and its GObject introspection bindings.
 The Debian/Ubuntu packages that need to be installed are
 `python3-gi` and `gir1.2-gtk-3.0`;
 in Fedora you need `gtk3` and `python3-gobject`;
 if you're using another
 distribution the required packages are most likely named something similar.
-The Solaar GUI also requires Python packages
-`PyYAML` (>= 5.1), `python-xlib` (>= 0.27), and `psutil` (>= 5.7.3).
-These are best installed using `pip` via `pip install --user <package>`
-if they are not already available.
-You may have to install the `gcc` and the Python development package (`python3-dev` or `python3-devel`,
+You may have to install `gcc` and the Python development package (`python3-dev` or `python3-devel`,
 depending on your distribution).
 
 If desktop notifications bindings are also installed

lib/logitech_receiver/diversion.py

@@ -53,13 +53,14 @@ except Exception:
     XK_KEYS = {}
     x11 = False
 
-# determine name of active process
+if x11:
+    # determine name of active process
+    disp_prog = Display()
+    NET_ACTIVE_WINDOW = disp_prog.intern_atom('_NET_ACTIVE_WINDOW')
+    NET_WM_PID = disp_prog.intern_atom('_NET_WM_PID')
+    root2 = disp_prog.screen().root
+    root2.change_attributes(event_mask=Xlib.X.PropertyChangeMask)
 
-disp_prog = Display()
-NET_ACTIVE_WINDOW = disp_prog.intern_atom('_NET_ACTIVE_WINDOW')
-NET_WM_PID = disp_prog.intern_atom('_NET_WM_PID')
-root2 = disp_prog.screen().root
-root2.change_attributes(event_mask=Xlib.X.PropertyChangeMask)
 active_process_name = None
 
 
@@ -82,13 +83,15 @@ def determine_active_program():
             active_process_name = active_program()
 
 
-_thread.start_new_thread(determine_active_program, ())
+if x11:
+    _thread.start_new_thread(determine_active_program, ())
 
 # determine current key modifiers
 # there must be a better way to do this
 
-display = Display()
-context = display.record_create_context(
+if x11:
+    display = Display()
+    context = display.record_create_context(
         0, [record.AllClients], [{
             'core_requests': (0, 0),
             'core_replies': (0, 0),
@@ -100,10 +103,9 @@ context = display.record_create_context(
             'client_started': False,
             'client_died': False,
         }]
-)
-
-modifier_keycodes = display.get_modifier_mapping()
-current_key_modifiers = 0
+    )
+    modifier_keycodes = display.get_modifier_mapping()
+    current_key_modifiers = 0
 
 
 def modifier_code(keycode):
@@ -162,7 +164,8 @@ TESTS = {
 
 COMPONENTS = {}
 
-displayt = Display()
+if x11:
+    displayt = Display()
 
 
 class RuleComponent(object):

setup.py

@@ -63,7 +63,7 @@ battery status, and show and modify some of the modifiable features of devices.
         'pyudev (>= 0.13)',
         'PyYAML (>= 5.1)',
         'python-xlib (>= 0.27)',
-        'psutil (>= 5.7.3)',
+        'psutil (>= 5.6.0)',
     ],
     package_dir={'': 'lib'},
     packages=['hidapi', 'logitech_receiver', 'solaar', 'solaar.ui', 'solaar.cli'],