NAME

black-primer - CI tool to check a number of projects in parallel using black

DESCRIPTION

black-primer is a tool built for CI (and humans) to have black --check a number of Git accessible projects in parallel. Projects are configured in primer.json

RUN FLOW

Ensure we have black + git installed
Load projects from primer.json
Run projects in parallel with --worker workers (defaults to CPU count / 2)

Checkout projects
Run black and record result
Clean up repository checkout _(can optionally be disabled via --keep)

Display results summary to screen
Default to cleaning up --work-dir (which defaults to tempfile schematics)
Return - 0 for successful run - < 0 for environment / internal error - > 0 for each project with an error

SPEED UP RUNS

If you're running locally yourself to test black on lots of code try:

•: Using -k / --keep + -w / --work-dir so you don't have to re-checkout the repo each run

CLI ARGUMENTS

Usage: black-primer [OPTIONS]
 primer - prime projects for blackening...
Options:
 -c, --config PATH      JSON config file path  [default: /Users/cooper/repos/
                        black/src/black_primer/primer.json]
 --debug                Turn on debug logging  [default: False]
 -k, --keep             Keep workdir + repos post run  [default: False]
 -L, --long-checkouts   Pull big projects to test  [default: False]
 -R, --rebase           Rebase project if already checked out  [default:
                        False]
 -w, --workdir PATH     Directory path for repo checkouts  [default: /var/fol
                        ders/tc/hbwxh76j1hn6gqjd2n2sjn4j9k1glp/T/primer.20200
                        517125229]
 -W, --workers INTEGER  Number of parallel worker coroutines  [default: 2]
 -h, --help             Show this message and exit.

## Primer config file

The config file is in JSON format. Its main element is the "projects" dictionary and each parameter is explained below:

{
 "projects": {
   "00_Example": {
     "cli_arguments": "List of extra CLI arguments to pass Black for this project",
     "expect_formatting_changes": "Boolean to indicate that the version of Black is expected to cause changes",
     "git_clone_url": "URL you would pass `git clone` to check out this repo",
     "long_checkout": "Boolean to have repo skipped by default unless `--long-checkouts` is specified",
     "py_versions": "List of major Python versions to run this project with - all will do as you'd expect - run on ALL versions"
   },
   "aioexabgp": {
     "cli_arguments": [],
     "expect_formatting_changes": true,
     "git_clone_url": "https://github.com/cooperlees/aioexabgp.git",
     "long_checkout": false,
     "py_versions": ["all", "3.8"]
   }
 }
}

An example primer config file is used by Black [here](https://github.com/psf/black/blob/master/src/black_primer/primer.json)

EXAMPLE RUN

cooper-mbp:black cooper$ ~/venvs/b/bin/black-primer
[2020-05-17 13:06:40,830] INFO: 4 projects to run Black over (lib.py:270)
[2020-05-17 13:06:44,215] INFO: Analyzing results (lib.py:285)
-- primer results 📊 --
3 / 4 succeeded (75.0%) ✅
1 / 4 FAILED (25.0%) 💩
 - 0 projects disabled by config
 - 0 projects skipped due to Python version
 - 0 skipped due to long checkout
Failed projects:
## flake8-bugbear:
 - Returned 1
 - stdout:
--- tests/b303_b304.py      2020-05-17 20:04:09.991227 +0000
+++ tests/b303_b304.py      2020-05-17 20:06:42.753851 +0000
@@ -26,11 +26,11 @@
     maxint = 5  # this is okay
     # the following should not crash
     (a, b, c) = list(range(3))
     # it is different than this
     a, b, c = list(range(3))
-    a, b, c, = list(range(3))
+    a, b, c = list(range(3))
     # and different than this
     (a, b), c = list(range(3))
     a, *b, c = [1, 2, 3, 4, 5]
     b[1:3] = [0, 0]
would reformat tests/b303_b304.py
Oh no! 💥 💔 💥
1 file would be reformatted, 22 files would be left unchanged.

COPYRIGHT

2018 Łukasz Langa