match-diff-lines 0.3.0

Installation

Best to install into a virtual environment with a Python installer like pip or similar.

Usage as tool

Invoke python -m match_diff_lines diff_file tool_output. The diff_file is a file containing the unified diff output you want to check against. The tool_output contains the output of your linter/tool which contains lines in the form of filename:line_num for example:

match_diff_lines.py:59:39: E271 multiple spaces after keyword

If any lines are contained in the diff, then they are printed and exit code 1 is returned.

With bash or zsh you can use temporary named pipes like this:

% python -m match_diff_lines <(git diff HEAD^) <(ruff check)

Usage as library

Call parse_unified_diff with a file like text object or a list of lines of a diff to get a dictionary with filenames as keys and a set of line numbers back.

0.3.0 - 2026-03-24

• Return individually changed line numbers for diffs with context instead of the full block including unchanged lines. [fschulze]

• parse_unified_diff now works with a list of lines from a splitlines call. [fschulze]

• Export type annotations for usage as library. [fschulze]

• Test with Python 3.9 - 3.14. [fschulze]

0.2.0 - 2024-07-21

• Add match-diff-lines script on installation. [fschulze]

0.1.0 - 2024-07-21

• Initial release. [fschulze]