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[etc/vim.git] / docs / contributing / gauging_changes.md
1 # Gauging changes
2
3 A lot of the time, your change will affect formatting and/or performance. Quantifying
4 these changes is hard, so we have tooling to help make it easier.
5
6 It's recommended you evaluate the quantifiable changes your _Black_ formatting
7 modification causes before submitting a PR. Think about if the change seems disruptive
8 enough to cause frustration to projects that are already "black formatted".
9
10 ## black-primer
11
12 `black-primer` is a tool built for CI (and humans) to have _Black_ `--check` a number of
13 Git accessible projects in parallel. (configured in `primer.json`) _(A PR will be
14 accepted to add Mercurial support.)_
15
16 ### Run flow
17
18 - Ensure we have a `black` + `git` in PATH
19 - Load projects from `primer.json`
20 - Run projects in parallel with `--worker` workers (defaults to CPU count / 2)
21   - Checkout projects
22   - Run black and record result
23   - Clean up repository checkout _(can optionally be disabled via `--keep`)_
24 - Display results summary to screen
25 - Default to cleaning up `--work-dir` (which defaults to tempfile schemantics)
26 - Return
27   - 0 for successful run
28   - \< 0 for environment / internal error
29   - \> 0 for each project with an error
30
31 ### Speed up runs 🏎
32
33 If you're running locally yourself to test black on lots of code try:
34
35 - Using `-k` / `--keep` + `-w` / `--work-dir` so you don't have to re-checkout the repo
36   each run
37
38 ### CLI arguments
39
40 ```{program-output} black-primer --help
41
42 ```