feat: add support for ocrmac OCR engine on macOS (#276)

* feat: add support for `ocrmac` OCR engine on macOS

- Integrates `ocrmac` as an OCR engine option for macOS users.
- Adds configuration options and dependencies for `ocrmac`.
- Updates documentation to reflect new engine support.

This change allows macOS users to utilize `ocrmac` for improved OCR performance and compatibility.

Signed-off-by: Suhwan Seo <nuridol@gmail.com>

* updated the poetry lock

Signed-off-by: Suhwan Seo <nuridol@gmail.com>

* Fix linting issues, update CLI docs, and add error for ocrmac use on non-Mac systems

- Resolved formatting and linting issues
- Updated `--ocr-engine` CLI option documentation for `ocrmac`
- Added RuntimeError for attempts to use `ocrmac` on non-Mac platforms

Signed-off-by: Suhwan Seo <nuridol@gmail.com>

* feat: add support for `ocrmac` OCR engine on macOS

- Integrates `ocrmac` as an OCR engine option for macOS users.
- Adds configuration options and dependencies for `ocrmac`.
- Updates documentation to reflect new engine support.

This change allows macOS users to utilize `ocrmac` for improved OCR performance and compatibility.

Signed-off-by: Suhwan Seo <nuridol@gmail.com>

* docs: update examples and installation for ocrmac support

- Added `OcrMacOptions` to `custom_convert.py` and `full_page_ocr.py` examples.
- Included usage comments and examples for `OcrMacOptions` in OCR pipelines.
- Updated installation guide to include instructions for installing `ocrmac`, noting macOS version requirements (10.15+).
- Highlighted that `ocrmac` leverages Apple's Vision framework as an OCR backend.

This enhances documentation for users working on macOS to leverage `ocrmac` effectively.

Signed-off-by: Suhwan Seo <nuridol@gmail.com>

* fix: update `ocrmac` dependency with macOS-specific marker

- Added `sys_platform == 'darwin'` marker to the `ocrmac` dependency in `pyproject.toml` to specify macOS compatibility.
- Updated the content hash in `poetry.lock` to reflect the changes.

This ensures the `ocrmac` dependency is only installed on macOS systems.

Signed-off-by: Suhwan Seo <nuridol@gmail.com>

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Signed-off-by: Suhwan Seo <nuridol@gmail.com>
Co-authored-by: Suhwan Seo <nuridol@gmail.com>

docs/examples/custom_convert.py

@@ -7,6 +7,7 @@ from docling.backend.pypdfium2_backend import PyPdfiumDocumentBackend
 from docling.datamodel.base_models import InputFormat
 from docling.datamodel.pipeline_options import PdfPipelineOptions
 from docling.document_converter import DocumentConverter, PdfFormatOption
+from docling.models.ocr_mac_model import OcrMacOptions
 from docling.models.tesseract_ocr_cli_model import TesseractCliOcrOptions
 from docling.models.tesseract_ocr_model import TesseractOcrOptions
 
@@ -122,6 +123,20 @@ def main():
     #     }
     # )
 
+    # Docling Parse with ocrmac(Mac only)
+    # ----------------------
+    # pipeline_options = PdfPipelineOptions()
+    # pipeline_options.do_ocr = True
+    # pipeline_options.do_table_structure = True
+    # pipeline_options.table_structure_options.do_cell_matching = True
+    # pipeline_options.ocr_options = OcrMacOptions()
+
+    # doc_converter = DocumentConverter(
+    #     format_options={
+    #         InputFormat.PDF: PdfFormatOption(pipeline_options=pipeline_options)
+    #     }
+    # )
+
     ###########################################################################
 
     start_time = time.time()