Fix Calibre on macOS

Fix #2192
Changed path to calibre executable file on macOS

lncrawl/binders/calibre.py

@@ -1,9 +1,9 @@
 import logging
 import os
+import platform
 import subprocess
 from typing import Union, List
 logger = logging.getLogger(__name__)
-EBOOK_CONVERT = "ebook-convert"
 CALIBRE_LINK = "https://calibre-ebook.com/download"
 
 
@@ -12,11 +12,17 @@ def run_ebook_convert(*args) -> bool:
     Calls `ebook-convert` with given args
     Visit https://manual.calibre-ebook.com/generated/en/ebook-convert.html for argument list.
     """
+    os_name = platform.platform()
+    if "macOS" in os_name:
+        ebook_convert = "/Applications/calibre.app/Contents/MacOS/ebook-convert"
+    else:
+        ebook_convert = "ebook-convert"
+
     try:
         isdebug = os.getenv("debug_mode")
         with open(os.devnull, "w", encoding="utf8") as dumper:
             subprocess.run(
-                args=[EBOOK_CONVERT] + list(args),
+                args=[ebook_convert] + list(args),
                 stdout=None if isdebug else dumper,
                 stderr=None if isdebug else dumper,
                 check=True