trailrunner

Walk paths and run things

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trailrunner is a simple library for walking paths on the filesystem, and executing functions for each file found. trailrunner obeys project level .gitignore files, and runs functions on a process pool for increased performance. trailrunner is designed for use by linting, formatting, and other developer tools that need to find and operate on all files in project in a predictable fashion with a minimal API:

walk() takes a single Path, and generates a list of significant files in that tree:

>>> from trailrunner import walk
>>> sorted(walk(Path("trailrunner")))
[
    PosixPath('trailrunner/__init__.py'),
    PosixPath('trailrunner/__version__.py'),
    PosixPath('trailrunner/core.py'),
    PosixPath('trailrunner/tests/__init__.py'),
    PosixPath('trailrunner/tests/__main__.py'),
    PosixPath('trailrunner/tests/core.py'),
]

run() takes a list of Path objects and a function, and runs that function once for each path given. It runs these functions on a process pool, and returns a mapping of paths to results:

>>> from trailrunner import run
>>> paths = [Path('trailrunner/core.py'), Path('trailrunner/tests/core.py')]
>>> run(paths, str)
{
    PosixPath('trailrunner/core.py'): 'trailrunner/core.py',
    PosixPath('trailrunner/tests/core.py'): 'trailrunner/tests/core.py',
}

walk_and_run() does exactly what you would expect:

>>> from trailrunner import walk_and_run
>>> walk_and_run([Path('trailrunner/tests')], str)
{
    PosixPath('trailrunner/tests/__init__.py'): 'trailrunner/tests/__init__.py',
    PosixPath('trailrunner/tests/__main__.py'): 'trailrunner/tests/__main__.py',
    PosixPath('trailrunner/tests/core.py'): 'trailrunner/tests/core.py',
}

Install

trailrunner requires Python 3.6 or newer. You can install it from PyPI:

$ pip install trailrunner

License

trailrunner is copyright John Reese, and licensed under the MIT license. I am providing code in this repository to you under an open source license. This is my personal repository; the license you receive to my code is from me and not from my employer. See the LICENSE file for details.