Merge pull request 'feature/1-focus-greeter-when-taking-control' (#2) from feature/1-focus-greeter-when-taking-control into master

Reviewed-on: #2

main.py

@@ -21,6 +21,7 @@ logging.basicConfig(
     )]
 )
 log = logging.getLogger("rich")
+log.setLevel("DEBUG")
 
 
 # Vars
@@ -53,6 +54,70 @@ log.debug(f"Printing environment vars ...")
 log.debug(os.environ)
 
 
+def x_focus_window(window_id: str) -> bool:
+    log.debug(f"Focusing window ID {window_id} ...")
+    try:
+        subprocess.run(
+            ["xdotool", "windowfocus", window_id],
+            check=True,
+            stdout=subprocess.PIPE,
+            encoding="utf-8")
+        log.info(f"Two 'sddm-greeter' windows detected one of which had focus, changed focus to the other one.")
+        return True
+    except subprocess.CalledProcessError as x_focus_window_error:
+        log.warning(f"Failed to focus window ID {window_id}, we'll not try again")
+        log.warning(x_focus_window_error)
+        return False
+
+
+def sddm_greeter_window_ids() -> list:
+    log.debug(f"Checking if an 'sddm-greeter' window exists ...")
+    try:
+        dm_windows = subprocess.run(
+            ["xdotool", "search", "--onlyvisible", "--classname", "sddm-greeter"],
+            check=True,
+            stdout=subprocess.PIPE,
+            encoding="utf-8")
+        return dm_windows.stdout.splitlines()
+    except subprocess.CalledProcessError as xdotool_error:
+        log.debug(f"No 'sddm-greeter' window exists, doing nothing")
+        log.debug(xdotool_error)
+        return []
+
+
+def sddm_change_focus_if_two_windows() -> bool:
+    dm_windows = sddm_greeter_window_ids()
+    if not dm_windows:
+        return False
+    else:
+        log.debug(f"Checking if 'sddm-greeter' window has focus ...")
+        try:
+            x_window_focus = subprocess.run(
+                ["xdotool", "getwindowfocus"],
+                check=True,
+                stdout=subprocess.PIPE,
+                encoding="utf-8")
+            x_window_id_has_focus = x_window_focus.stdout.splitlines()[0]
+            if x_window_id_has_focus in dm_windows:
+                log.debug(f"An 'sddm-greeter' window has focus")
+                if len(dm_windows) > 1:
+                    if len(dm_windows) == 2:
+                        log.debug(f"We're assuming we have to focus the other one")
+                        log.debug(f"From list of 'sddm-greeter' window IDs ({dm_windows}) remove the one that has "
+                                  f"focus ({x_window_id_has_focus})")
+                        dm_windows.remove(x_window_id_has_focus)
+                        x_focus_window(dm_windows[0])
+                    else:
+                        log.warning(f"Number of 'sddm-greeter' windows ({len(dm_windows)}) is unexpected, not doing "
+                                    f"anything")
+                else:
+                    log.debug(f"No other 'sddm-greeter' windows exist, no need to focus anything")
+        except subprocess.CalledProcessError as xdotool_error:
+            log.warning(f"Unable to get ID of focused window")
+            log.warning(xdotool_error)
+            return False
+
+
 def propagate_keypress(cec_key_id: int) -> None:
     log.info(f"""Key press '{xdo_map[cec_key_id]["human_readable"]}' detected (CEC key ID '{cec_key_id}')""")
     subprocess.run(["xdotool", "key", xdo_map[cec_key_id]["xdo"]], check=True)
@@ -135,6 +200,7 @@ cec.add_callback(keypress_handler, cec.EVENT_KEYPRESS)
 cec.add_callback(log_handler, cec.EVENT_LOG)
 log.debug(f"Event handlers active")
 log.info(f"Open for business on adapter '{use_adapter}'!")
+sddm_change_focus_if_two_windows()
 
 
 while True: