Function convert_images

build_ebook.py:25–57

Convert all SVG images to PNGs.

(images_dir: Path, converted_image_dir: Path)

def convert_images(images_dir: Path, converted_image_dir: Path) -> None:
    """Convert all SVG images to PNGs."""

    if not converted_image_dir.exists():
        converted_image_dir.mkdir()

    for source_file in images_dir.glob("*"):
        if source_file.suffix == ".svg":
            dest_file = converted_image_dir / source_file.with_suffix(".png").name

            try:
                subprocess.check_output(
                    [
                        "inkscape",
                        f"--export-filename={dest_file.as_posix()}",
                        source_file.as_posix(),
                    ],
                    stderr=subprocess.STDOUT,
                )
            except FileNotFoundError:
                raise RuntimeError(
                    f"failed to convert {source_file.name} to {dest_file.name}: "
                    "inkscape not installed"
                )
            except CalledProcessError as e:
                raise RuntimeError(
                    f"failed to convert {source_file.name} to {dest_file.name}: "
                    f"inkscape failed: {e.output.decode()}"
                )
        else:
            shutil.copy(source_file, converted_image_dir / source_file.name)

    return converted_image_dir


@dataclass