Drop dependency on psutil + fix a linux crash requesting gnome-screenshot

pyproject.toml

@@ -11,7 +11,6 @@ dependencies = [
   "numpy >=2.1", # Python 3.13 support
   "opencv-python-headless >=4.10", # NumPy 2 support
   "packaging >=20.0", # py.typed
-  "psutil >=6.0.0", # Python 3.13 support
   # When needed, dev builds can be found at https://download.qt.io/snapshots/ci/pyside/dev?C=M;O=D
   "PySide6-Essentials <6.8.1", # Has typing issue with QMessageBox.warning https://bugreports.qt.io/browse/PYSIDE-2939
   # "PySide6-Essentials >=6.8.2", # Fixed typing issue with QMessageBox.warning
@@ -60,7 +59,6 @@ dev = [
   "types-PyAutoGUI",
   "types-PyScreeze; sys_platform == 'linux'",
   "types-keyboard",
-  "types-psutil",
   "types-pyinstaller",
   "types-python-xlib; sys_platform == 'linux'",
   "types-pywin32 >=306.0.0.20240130; sys_platform == 'win32'",

src/AutoSplit.py

@@ -23,6 +23,8 @@
 if sys.platform == "linux":
     # Fixes "undefined symbol: wl_proxy_marshal_flags": https://bugreports.qt.io/browse/QTBUG-114635
     os.environ.setdefault("QT_QPA_PLATFORM", "xcb")
+    # Useful for debugging missing system packages
+    # os.environ.setdefault("QT_DEBUG_PLUGINS", "1")
 
 import signal
 from collections.abc import Callable
@@ -33,7 +35,6 @@
 
 import cv2
 from cv2.typing import MatLike
-from psutil import process_iter
 from PySide6 import QtCore, QtGui
 from PySide6.QtTest import QTest
 from PySide6.QtWidgets import QApplication, QFileDialog, QLabel, QMainWindow, QMessageBox
@@ -82,6 +83,7 @@
     flatten,
     imwrite,
     is_valid_image,
+    list_processes,
     open_file,
 )
 
@@ -1061,18 +1063,12 @@ def seconds_remaining_text(seconds: float):
     return f"{seconds:.1f} second{'' if 0 < seconds <= 1 else 's'} remaining"
 
 
-# TODO: Add Linux support
 def is_already_open():
     # When running directly in Python, any AutoSplit process means it's already open
     # When bundled, we must ignore itself and the splash screen
     max_processes = 3 if FROZEN else 1
-    process_count = 0
-    for process in process_iter():
-        if process.name() == "AutoSplit.exe":
-            process_count += 1
-        if process_count >= max_processes:
-            return True
-    return False
+    process_name = "AutoSplit.exe" if sys.platform == "win32" else "AutoSplit.elf"
+    return list_processes().count(process_name) >= max_processes
 
 
 def main():

src/capture_method/__init__.py

@@ -139,7 +139,9 @@ def get(self, key: CaptureMethodEnum, default: object = None, /):
         CAPTURE_METHODS[CaptureMethodEnum.XCB] = XcbCaptureMethod
     try:
         pyscreeze.screenshot()
-    except UnidentifiedImageError:
+    except (UnidentifiedImageError, pyscreeze.PyScreezeException):
+        # TODO: Should we show a specific warning for, or document:
+        # pyscreeze.PyScreezeException: Your computer uses the Wayland window system. Scrot works on the X11 window system but not Wayland. You must install gnome-screenshot by running `sudo apt install gnome-screenshot` # noqa: E501
         pass
     else:
         # TODO: Investigate solution for Slow Scrot:

src/utils.py

@@ -301,6 +301,22 @@ def run_tesseract(png: bytes):
     )
 
 
+def list_processes():
+    if sys.platform == "win32":
+        return [
+            # The first row is the process name
+            line.split()[0]
+            for line in subprocess.check_output(  # noqa: S603 # Known input
+                "C:/Windows/System32/tasklist.exe", text=True
+            ).splitlines()[3:]  # Skip the table header lines
+            if line
+        ]
+
+    return subprocess.check_output(  # noqa: S603 # Known input
+        ("ps", "-eo", "comm"), text=True
+    ).splitlines()[1:]  # Skip the header line
+
+
 # Environment specifics
 WINDOWS_BUILD_NUMBER = int(version().split(".")[-1]) if sys.platform == "win32" else -1
 FIRST_WIN_11_BUILD = 22000