Fixed sleep inhibition error

CHANGELOG.md

@@ -1,6 +1,8 @@
 # 1.1.7 (ğre-release)
 - Added MPS GPU acceleration support for Silicon Mac, mentioned in https://github.com/denizsafak/abogen/issues/32#issuecomment-3155902040 by @jefro108
 - Added word-by-word karaoke highlighting feature by @robmckinnon in PR #65
+- Fixed sleep inhibition error occurring on some Linux systems that do not use systemd, mentioned in #67 by @hendrack
+- Improvements in code and documentation.
 
 # 1.1.6
 - Improved EPUB chapter detection: Now reliably detects chapters from NAV HTML (TOC) files, even in non-standard EPUBs, fixes the issue mentioned by @jefro108 in #33

abogen/utils.py

@@ -3,6 +3,7 @@ import sys
 import json
 import warnings
 import platform
+import shutil
 import subprocess
 import re
 from threading import Thread
@@ -286,6 +287,8 @@ def prevent_sleep_start():
         # Add program name and reason for inhibition
         program_name = PROGRAM_NAME
         reason = "Prevent sleep during abogen process"
+        # Only attempt to use systemd-inhibit if it's available on the system.
+        if shutil.which("systemd-inhibit"):
             _sleep_procs["Linux"] = create_process(
                 [
                     "systemd-inhibit",
@@ -297,6 +300,11 @@ def prevent_sleep_start():
                     "infinity",
                 ]
             )
+        else:
+            # Non-systemd distro or systemd tools not installed: skip inhibition rather than crash
+            print(
+                "systemd-inhibit not found: skipping sleep inhibition on this Linux system."
+            )
 
 
 def prevent_sleep_end():