| #!/usr/bin/env bash | |
| # This script verifies that the non-binary files tracked in the Git index do | |
| # not contain any Unicode directional formatting: such formatting could be used | |
| # to deceive reviewers into interpreting code differently from the compiler. | |
| # This is intended to run on an Ubuntu agent in a GitHub workflow. | |
| # | |
| # To allow translated messages to introduce such directional formatting in the | |
| # future, we exclude the `.po` files from this validation. | |
| # | |
| # Neither GNU grep nor `git grep` (not even with `-P`) handle `\u` as a way to | |
| # specify UTF-8. | |
| # | |
| # To work around that, we use `printf` to produce the pattern as a byte | |
| # sequence, and then feed that to `git grep` as a byte sequence (setting | |
| # `LC_CTYPE` to make sure that the arguments are interpreted as intended). | |
| # | |
| # Note: we need to use Bash here because its `printf` interprets `\uNNNN` as | |
| # UTF-8 code points, as desired. Running this script through Ubuntu's `dash`, | |
| # for example, would use a `printf` that does not understand that syntax. | |
| # U+202a..U+2a2e: LRE, RLE, PDF, LRO and RLO | |
| # U+2066..U+2069: LRI, RLI, FSI and PDI | |
| regex='(\u202a|\u202b|\u202c|\u202d|\u202e|\u2066|\u2067|\u2068|\u2069)' | |
| ! LC_CTYPE=C git grep -El "$(LC_CTYPE=C.UTF-8 printf "$regex")" \ | |
| -- ':(exclude,attr:binary)' ':(exclude)*.po' |