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-rw-r--r--bsie/reader/preview/_pillow.py44
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+"""
+
+Part of the bsie module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# standard imports
+from functools import partial
+import typing
+
+# external imports
+import PIL.Image
+
+# bsie imports
+from bsie.utils import errors
+
+# inner-module imports
+from . import utils
+from .. import base
+
+# exports
+__all__: typing.Sequence[str] = (
+ 'PillowPreviewReader',
+ )
+
+
+## code ##
+
+class PillowPreviewReader(base.Reader):
+ """Produce previews for image files using the Pillow library."""
+
+ def __call__(self, path: str) -> typing.Callable[[int], PIL.Image.Image]:
+ try:
+ # open file with PIL
+ img = PIL.Image.open(path)
+ # return callback
+ return partial(utils.resize, img)
+ except PIL.UnidentifiedImageError as err:
+ # failed to open, skip file
+ raise errors.UnsupportedFileFormatError(path) from err
+ except IOError as err:
+ raise errors.ReaderError(path) from err
+
+# EOF ##