WIP replace with image

Author: FlorentinD

scripts/nb2doc/convert.sh

@@ -1,28 +1,5 @@
 #!/bin/bash
 
-DOC_DIR=doc/modules/ROOT/pages/tutorials
-NB_DIR=examples
-
-for notebook in ${NB_DIR}/*.ipynb
-do
-  docfile=$(basename ${notebook} | cut -d. -f1)
-  echo "${notebook} -> ${DOC_DIR}/${docfile}.adoc"
-
-  # --noprompt
-  #   Skips the "In/Out" lines before each cell
-  # --ClearMetadataPreprocessor.enabled=True
-  #   Cleans the "ipython3" language replacing it with "Python"
-  #   (for Asciidoc code cells)
-  # --ASCIIDocExporter.file_extension=.adoc
-  #   If not set, the extension is .asciidoc
-
-  jupyter nbconvert \
-    --to asciidoc \
-    --template=scripts/nb2doc/asciidoc-template \
-    --output-dir ${DOC_DIR} \
-    --ASCIIDocExporter.file_extension=.adoc \
-    --no-prompt \
-    --ClearMetadataPreprocessor.enabled=True \
-    ${notebook}
-done
-
+python ./scripts/nb2doc/convert_notebooks.py \
+  -o "doc/modules/ROOT/pages/tutorials" \
+  -i "examples/"

scripts/nb2doc/convert_notebooks.py

@@ -0,0 +1,104 @@
+# reasons for not using nbconvert cli tool:
+# * cannot keep output based on a given tag
+
+import argparse
+import logging.config
+import re
+import sys
+from pathlib import Path
+
+import nbconvert
+from nbconvert.preprocessors import Preprocessor
+
+REPLACE_CELL_OUTPUT_TAG_PATTTERN = r"replace-output-with\:(.*)"
+METADATA_TAG_KEY = "tags"
+
+TEMPLATE_DIR = Path("scripts/nb2doc/asciidoc-template")
+
+logging.basicConfig()
+handler = logging.StreamHandler(sys.stdout)
+handler.setLevel(logging.DEBUG)
+logger = logging.getLogger()
+
+
+class OutputReplacerPreprocessor(Preprocessor):
+    """
+    Replaces the output from tagged code cell in a notebook.
+    Expected Tag format `replace-with:images/some.png`
+    """
+
+    def __init__(self, replace_base_dir: Path, **kw):
+        self._replace_base_dir = replace_base_dir
+        super().__init__(**kw)
+
+    def preprocess_cell(self, cell, resources, cell_index):
+        """
+        Apply a transformation on each cell. See base.py for details.
+        """
+
+        if replace_tags := [
+            tag for tag in cell["metadata"].get(METADATA_TAG_KEY, []) if re.match(REPLACE_CELL_OUTPUT_TAG_PATTTERN, tag)
+        ]:
+            if len(replace_tags) > 1:
+                raise ValueError(
+                    f"Expected one or zero tags matching `{REPLACE_CELL_OUTPUT_TAG_PATTTERN}`. But got `{replace_tags}`"
+                )
+            new_output_file_name = replace_tags[0].split(":")[1].strip()
+            new_ouput_file = self._replace_base_dir.joinpath(new_output_file_name)
+            logger.info(f"Replace output with content from: {new_ouput_file}")
+            with new_ouput_file.open("r") as new_output:
+                # TODO: figure-out schema of cell outputs
+                # TODO Implement according to https://nbformat.readthedocs.io/en/latest/format_description.html#display-data
+                cell.outputs = [
+                    {
+                        "output_type": "display_data",
+                        "data": {"text/plain": str(new_output)},
+                        "metadata": {},
+                    }
+                ]
+                cell.execution_count = None
+        return cell, resources
+
+
+def to_output_file(input_file: Path, output_dir: Path) -> Path:
+    return output_dir.joinpath(input_file.name.replace(".ipynb", ".adoc"))
+
+
+def main(input_path: Path, output_dir: Path) -> None:
+    if input_path.is_file():
+        notebooks = [input_path]
+    else:
+        notebooks = [f for f in input_path.iterdir() if f.is_file() and f.suffix == ".ipynb"]
+
+    exporter = nbconvert.ASCIIDocExporter(template_file=str(TEMPLATE_DIR.joinpath("index.adoc.j2")))
+    # Skips the "In/Out" lines before each cell
+    exporter.exclude_input_prompt = True
+    exporter.exclude_output_prompt = True
+
+    metadata_cleaner = nbconvert.preprocessors.ClearMetadataPreprocessor(preserve_cell_metadata_mask=METADATA_TAG_KEY)
+    output_replacer = OutputReplacerPreprocessor(replace_base_dir=input_path)
+
+    exporter.register_preprocessor(metadata_cleaner, enabled=True)
+    exporter.register_preprocessor(output_replacer, enabled=True)
+
+    logger.info(f"Converting {len(notebooks)} notebooks.")
+
+    for notebook in notebooks:
+        output_file = to_output_file(notebook, output_dir)
+        logger.info(f"Converting notebook from `{input_path}` to: `{output_file}`")
+        output = exporter.from_filename(notebook)
+
+        converted = output[0]
+
+        with output_file.open(mode="w") as out:
+            out.write(converted)
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-o", "--output", required=True, help="directory to write the result to")
+    parser.add_argument("-i", "--input", required=True, help="path to the notebook file")
+
+    args = parser.parse_args()
+
+    main(Path(args.input), Path(args.output))