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4e3898d0d7
Rewrite the PO file handling logic in Rust and make it available via an
xtask. Replaces the
`build_tools/{update_translations,fish_xgettext}.fish` scripts.
Main benefits:
- Better ergonomics
- Better error handling
- Eliminates the need for a fish executable for updating PO files,
which is particularly useful in CI
- Improved performance, mainly due to concurrent threads working on the
PO files in parallel
The behavior is mostly unchanged, with the minor exception that section
headers for empty sections are now omitted in PO files.
The interface for invoking the tooling is quite different. Instead of
working with flags, `cargo xtask gettext` has 3 subcommands:
- `update` modifies the PO files to match the current sources
- `check` is like update, but instead of modifying the PO files, it
shows diffs between the current version of the PO files and what they
would look like after updating. When there is a difference, the xtask
exits non-zero, making it useful for checks to detect outdated PO
files.
- `new` creates a new PO file for the given language.
Both the `update` and `check` command take any number of file paths to
specify the PO files to consider. If none are specified, all files in
`localization/po/` are considered.
Extracting gettext messages from Rust still requires compiling with the
`gettext-extract` feature active. In situations where compilation is
needed for other purposes as well, it can make sense to only build once
and then tell the gettext xtask about the directory into which the
messages have been extracted. This can be done via the
`--rust-extraction-dir` flag. If we stop having gettext messages in
Rust, this logic can be removed.
Closes #12676