Add support for Linux clipboard reading (#44)

* Allow clipboard reading on Linux using Pillow 10

* Update README.md to reflect Pillow changes

* Update README.md with Linux clipboard requirements

* Fix "Using CUDA;Using CPU" console output

* Add verbose option to help with debugging

* Restore wayland codepath for writing text to clipboard

README.md

@@ -23,7 +23,7 @@ See also:
 
 # Installation
 
-You need Python 3.6, 3.7, 3.8 or 3.9. Unfortunately, PyTorch does not support Python 3.10 yet.
+You need Python 3.8, 3.9, 3.10 or 3.11.
 
 If you want to run with GPU, install PyTorch as described [here](https://pytorch.org/get-started/locally/#start-locally),
 otherwise this step can be skipped.
@@ -66,10 +66,11 @@ text = mocr(img)
 
 Manga OCR can run in the background and process new images as they appear.
 
-You might use a tool like [ShareX](https://getsharex.com/) to manually capture a region of the screen and let the
+You might use a tool like [ShareX](https://getsharex.com/) or [Flameshot](https://flameshot.org/) to manually capture a region of the screen and let the
 OCR read it either from the system clipboard, or a specified directory. By default, Manga OCR will write recognized text to clipboard,
 from which it can be read by a dictionary like [Yomichan](https://github.com/FooSoft/yomichan).
-Reading images from clipboard works only on Windows and macOS, on Linux you should read from a directory instead.
+
+Clipboard mode on Linux requires `wl-copy` for Wayland sessions or `xclip` for X11 sessions. You can find out which one your system needs by running `echo $XDG_SESSION_TYPE` in the terminal.
 
 Your full setup for reading manga in Japanese with a dictionary might look like this:
 

manga_ocr/ocr.py

@@ -18,7 +18,7 @@ class MangaOcr:
         if not force_cpu and torch.cuda.is_available():
             logger.info('Using CUDA')
             self.model.cuda()
-        if not force_cpu and torch.backends.mps.is_available():
+        elif not force_cpu and torch.backends.mps.is_available():
             logger.info('Using MPS')
             self.model.to('mps')
         else:

manga_ocr/run.py

@@ -48,7 +48,8 @@ def run(read_from='clipboard',
         write_to='clipboard',
         pretrained_model_name_or_path='kha-white/manga-ocr-base',
         force_cpu=False,
-        delay_secs=0.1
+        delay_secs=0.1,
+        verbose=False
         ):
     """
     Run OCR in the background, waiting for new images to appear either in system clipboard, or a directory.
@@ -58,6 +59,7 @@ def run(read_from='clipboard',
     :param write_to: Specifies where to save recognized texts to. Can be either "clipboard", or a path to a text file.
     :param pretrained_model_name_or_path: Path to a trained model, either local or from Transformers' model hub.
     :param force_cpu: If True, OCR will use CPU even if GPU is available.
+    :param verbose: If True, unhides all warnings.
     :param delay_secs: How often to check for new images, in seconds.
     """
 
@@ -76,12 +78,6 @@ def run(read_from='clipboard',
                 raise NotImplementedError(msg)
 
     if read_from == 'clipboard':
-
-        if sys.platform not in ('darwin', 'win32'):
-            msg = 'Reading images from clipboard works only on macOS and Windows. ' \
-                  'On Linux, run "manga_ocr /path/to/screenshot/folder" to read images from a folder instead.'
-            raise NotImplementedError(msg)
-
         from PIL import ImageGrab
         logger.info('Reading from clipboard')
 
@@ -91,15 +87,21 @@ def run(read_from='clipboard',
 
             try:
                 img = ImageGrab.grabclipboard()
-            except OSError:
+            except OSError as error:
-                logger.warning('Error while reading from clipboard')
+                if not verbose and "cannot identify image file" in str(error):
+                    # Pillow error when clipboard hasn't changed since last grab (Linux)
+                    pass
+                elif not verbose and "target image/png not available" in str(error):
+                    # Pillow error when clipboard contains text (Linux, X11)
+                    pass
+                else:
+                    logger.warning('Error while reading from clipboard ({})'.format(error))
             else:
                 if isinstance(img, Image.Image) and not are_images_identical(img, old_img):
                     process_and_write_results(mocr, img, write_to)
 
             time.sleep(delay_secs)
 
-
     else:
         read_from = Path(read_from)
         if not read_from.is_dir():

requirements.txt

@@ -3,7 +3,7 @@ fugashi
 jaconv
 loguru
 numpy
-Pillow
+Pillow>=10.0.0
 pyperclip
 torch>=1.0
 transformers>=4.25.0