feat: expose ocr-lang in CLI

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

docling/cli/main.py

@@ -129,6 +129,12 @@ def export_documents(
     )
 
 
+def _comma_split(raw: Optional[str]) -> Optional[List[str]]:
+    if raw is None:
+        return None
+    return raw.split(",")
+
+
 @app.command(no_args_is_help=True)
 def convert(
     input_sources: Annotated[
@@ -163,6 +169,13 @@ def convert(
     ocr_engine: Annotated[
         OcrEngine, typer.Option(..., help="The OCR engine to use.")
     ] = OcrEngine.EASYOCR,
+    ocr_lang: Annotated[
+        Optional[str],
+        typer.Option(
+            ...,
+            help="Provide a comma-separated list of languages used by the OCR engine. Note that each OCR engine has different values for the language names.",
+        ),
+    ] = None,
     pdf_backend: Annotated[
         PdfBackend, typer.Option(..., help="The PDF backend to use.")
     ] = PdfBackend.DLPARSE_V1,
@@ -248,6 +261,10 @@ def convert(
         case _:
             raise RuntimeError(f"Unexpected OCR engine type {ocr_engine}")
 
+    ocr_lang_list = _comma_split(ocr_lang)
+    if ocr_lang_list is not None:
+        ocr_options.lang = ocr_lang_list
+
     pipeline_options = PdfPipelineOptions(
         do_ocr=ocr,
         ocr_options=ocr_options,

docling/datamodel/pipeline_options.py

@@ -22,6 +22,7 @@ class TableStructureOptions(BaseModel):
 
 class OcrOptions(BaseModel):
     kind: str
+    lang: List[str]
     force_full_page_ocr: bool = False  # If enabled a full page OCR is always applied
     bitmap_area_threshold: float = (
         0.05  # percentage of the area for a bitmap to processed with OCR