bitcut

A simple CLI for slicing and splicing binary bit ranges. Aimed at embedded style bit‑field hacking and quick validation against datasheets.

• Ever been annoyed with double checking if the hexadecimal value you are writing to a register actually set specifc bits you want to set?

• Tired of decoding hex/decimals to see which bits are actually set and triple checking with a datasheet?

Look no further! Bitcut makes it easy to go from binary strings to hex and vice versa.

• slice a value into bit ranges,
• splice a value from ranges.

For bit‑field hacking, protocol specs and embedded.

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Example Usage

Slice a value into bit ranges:

$ bitcut slice 0x42 6:4 3:0
[6:0] - b'1000010' # Full Slice
[6:4] - b'100'
[3:0] - b'0010'

Splice a value from bit ranges:

$ bitcut splice 6:4=100 3:0=0010
[6:4] - b'100'
[3:0] - b'0010'
Binary String: 01000010
Hexadecimal  : 0x42
Unsigned int : 66

See full help:

$ bitcut --help
$ bitcut slice --help
$ bitcut splice --help

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Installation

From PyPI:

pip install bitcut

From a local checkout:

pip install .

(Requires Python ≥3.10.)

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Development

This repo uses uv for development

uv venv
uv sync              # installs dependencies + dev deps
uv pip install -e .

Run tests (coverage via pytest.ini):

uv run pytest

Coverage HTML report is written to htmlcov/index.html.

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License

MIT