Fix more mypy errors

src/ocrmypdf/_concurrent.py

@@ -84,7 +84,7 @@ def exec_progress_pool(
     task_arguments: Optional[Iterable] = None,
     task_finished: Optional[Callable] = None,
 ):
-    log_queue = multiprocessing.Queue(-1)
+    log_queue: multiprocessing.Queue = multiprocessing.Queue(-1)
     listener = threading.Thread(target=log_listener, args=(log_queue,))
 
     if use_threads:

src/ocrmypdf/_exec/ghostscript.py

@@ -25,6 +25,7 @@ from os import fspath
 from pathlib import Path
 from shutil import which
 from subprocess import PIPE, CalledProcessError
+from typing import Optional, cast
 
 from PIL import Image
 
@@ -34,12 +35,12 @@ from ocrmypdf.subprocess import get_version, run
 
 log = logging.getLogger(__name__)
 
-GS = 'gs'
+_gswin = None
 if os.name == 'nt':
-    GS = which('gswin64c')
-    if not GS:
-        GS = which('gswin32c')
-        if not GS:
+    _gswin = which('gswin64c')
+    if not _gswin:
+        _gswin = which('gswin32c')
+        if not _gswin:
             raise MissingDependencyError(
                 """
                 ---------------------------------------------------------------------
@@ -52,7 +53,10 @@ if os.name == 'nt':
                 ---------------------------------------------------------------------
                 """
             )
-    GS = Path(GS).stem
+    _gswin = Path(_gswin).stem
+
+GS = _gswin if _gswin else 'gs'
+del _gswin
 
 
 def version():
@@ -77,7 +81,7 @@ def jpeg_passthrough_available() -> bool:
 
 
 def _gs_error_reported(stream) -> bool:
-    return re.search(r'error', stream, flags=re.IGNORECASE)
+    return True if re.search(r'error', stream, flags=re.IGNORECASE) else False
 
 
 def rasterize_pdf(

src/ocrmypdf/_exec/tesseract.py

@@ -123,7 +123,7 @@ def get_languages():
     return set(lang.strip() for lang in rest)
 
 
-def tess_base_args(langs: List[str], engine_mode) -> List[str]:
+def tess_base_args(langs: List[str], engine_mode: int) -> List[str]:
     args = ['tesseract']
     if langs:
         args.extend(['-l', '+'.join(langs)])
@@ -132,7 +132,7 @@ def tess_base_args(langs: List[str], engine_mode) -> List[str]:
     return args
 
 
-def get_orientation(input_file: Path, engine_mode, timeout: float):
+def get_orientation(input_file: Path, engine_mode: int, timeout: float):
     args_tesseract = tess_base_args(['osd'], engine_mode) + [
         '--psm',
         '0',
@@ -229,9 +229,9 @@ def generate_hocr(
     input_file: Path,
     output_hocr: Path,
     output_text: Path,
-    languages: list,
-    engine_mode,
-    tessconfig: list,
+    languages: List[str],
+    engine_mode: int,
+    tessconfig: List[str],
     timeout: float,
     pagesegmode: int,
     user_words,
@@ -290,7 +290,7 @@ def generate_pdf(
     output_pdf: Path,
     output_text: Path,
     languages: List[str],
-    engine_mode,
+    engine_mode: int,
     tessconfig: List[str],
     timeout: float,
     pagesegmode: int,

src/ocrmypdf/api.py

@@ -18,7 +18,6 @@
 import logging
 import os
 import sys
-from argparse import ArgumentParser
 from enum import IntEnum
 from pathlib import Path
 from typing import BinaryIO, Iterable, Union
@@ -27,7 +26,8 @@ from ocrmypdf._logging import PageNumberFilter, TqdmConsole
 from ocrmypdf._plugin_manager import get_plugin_manager
 from ocrmypdf._sync import run_pipeline
 from ocrmypdf._validation import check_options
-from ocrmypdf.cli import get_parser
+from ocrmypdf.cli import ArgumentParser, get_parser
+from ocrmypdf.helpers import is_iterable_notstr
 
 try:
     import coloredlogs
@@ -153,7 +153,7 @@ def create_options(
                 cmdline.append(f"--{cmd_style_arg}")
             continue
 
-        if isinstance(val, Iterable) and not isinstance(val, str):
+        if is_iterable_notstr(val):
             for elem in val:
                 cmdline.append(f"--{cmd_style_arg}")
                 cmdline.append(elem)

src/ocrmypdf/helpers.py

@@ -113,6 +113,7 @@ def samefile(f1: os.PathLike, f2: os.PathLike):
 
 
 def is_iterable_notstr(thing: Any) -> bool:
+    """Is this is an iterable type, other than a string?"""
     return isinstance(thing, Iterable) and not isinstance(thing, str)