Luke Granger-Brown
57725ef3ec
git-subtree-dir: third_party/nixpkgs git-subtree-split: 76612b17c0ce71689921ca12d9ffdc9c23ce40b2
118 lines
3.8 KiB
Python
118 lines
3.8 KiB
Python
"""Copy Noto Color Emoji PNGs into an extracted Signal ASAR archive.
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Signal loads small Apple emoji PNGs directly from
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`node_modules/emoji-datasource-apple/img/apple/64`, and downloads and
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caches large Apple emoji WebP files in `.proto` bundles on the fly. The
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latter are not a copyright concern for the Nixpkgs cache, but would
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result in inconsistent presentation between small and large emoji.
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We skip the complexity and buy some additional privacy by replacing the
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`emoji://jumbo?emoji=` URL prefix with a `file://` path to the copied
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PNGs inside the ASAR archive, and linking the `node_modules` PNG paths
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directly to them.
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"""
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import json
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import shutil
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import sys
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from pathlib import Path
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def signal_name_to_emoji(signal_emoji_name: str) -> str:
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r"""Return the emoji corresponding to a Signal emoji name.
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Signal emoji names are concatenations of UTF‐16 code units,
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represented in lowercase big‐endian hex padded to four digits.
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>>> signal_name_to_emoji("d83dde36200dd83cdf2bfe0f")
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'😶🌫️'
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>>> b"\xd8\x3d\xde\x36\x20\x0d\xd8\x3c\xdf\x2b\xfe\x0f".decode("utf-16-be")
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'😶🌫️'
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"""
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hex_bytes = zip(signal_emoji_name[::2], signal_emoji_name[1::2])
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emoji_utf_16_be = bytes(
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int("".join(hex_pair), 16) for hex_pair in hex_bytes
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)
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return emoji_utf_16_be.decode("utf-16-be")
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def emoji_to_noto_name(emoji: str) -> str:
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r"""Return the Noto emoji name of an emoji.
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Noto emoji names are underscore‐separated Unicode scalar values,
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represented in lowercase big‐endian hex padded to at least four
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digits. Any U+FE0F variant selectors are omitted.
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>>> emoji_to_noto_name("😶🌫️")
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'1f636_200d_1f32b'
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>>> emoji_to_noto_name("\U0001f636\u200d\U0001f32b\ufe0f")
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'1f636_200d_1f32b'
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"""
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return "_".join(
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f"{ord(scalar_value):04x}"
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for scalar_value in emoji
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if scalar_value != "\ufe0f"
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)
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def emoji_to_emoji_data_name(emoji: str) -> str:
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r"""Return the npm emoji-data emoji name of an emoji.
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emoji-data emoji names are hyphen‐minus‐separated Unicode scalar
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values, represented in lowercase big‐endian hex padded to at least
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four digits.
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>>> emoji_to_emoji_data_name("😶🌫️")
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'1f636-200d-1f32b-fe0f'
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>>> emoji_to_emoji_data_name("\U0001f636\u200d\U0001f32b\ufe0f")
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'1f636-200d-1f32b-fe0f'
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"""
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return "-".join(f"{ord(scalar_value):04x}" for scalar_value in emoji)
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def _main() -> None:
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noto_png_path, asar_root = (Path(arg) for arg in sys.argv[1:])
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asar_root = asar_root.absolute()
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out_path = asar_root / "images" / "nixpkgs-emoji"
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out_path.mkdir(parents=True)
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emoji_data_out_path = (
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asar_root
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/ "node_modules"
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/ "emoji-datasource-apple"
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/ "img"
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/ "apple"
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/ "64"
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)
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emoji_data_out_path.mkdir(parents=True)
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jumbomoji_json_path = asar_root / "build" / "jumbomoji.json"
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with jumbomoji_json_path.open() as jumbomoji_json_file:
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jumbomoji_packs = json.load(jumbomoji_json_file)
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for signal_emoji_names in jumbomoji_packs.values():
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for signal_emoji_name in signal_emoji_names:
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emoji = signal_name_to_emoji(signal_emoji_name)
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try:
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shutil.copy(
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noto_png_path / f"emoji_u{emoji_to_noto_name(emoji)}.png",
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out_path / emoji,
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)
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except FileNotFoundError:
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print(
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f"Missing Noto emoji: {emoji} {signal_emoji_name}",
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file=sys.stderr,
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)
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continue
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(
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emoji_data_out_path / f"{emoji_to_emoji_data_name(emoji)}.png"
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).symlink_to(out_path / emoji)
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print(out_path.relative_to(asar_root))
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if __name__ == "__main__":
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_main()
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