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Andrey Esipov
5e20b41743
In many macOS shells the default locale (e.g. en_US.UTF-8) makes bash glob brackets like `[A-Z]` match lowercase letters too, so the existing `case "$name" in [A-Z_][A-Z0-9_]*)` branch lets names like `lower-case` through validation. The function then trips `printf -v "$varname"` and `export "$varname"` with `not a valid identifier` errors that surface mid-prompt, which is exactly what the validator was supposed to prevent. Pinning `LC_ALL=C` inside the function gives ASCII-only bracket semantics on both macOS and Linux, matching the documented `[A-Z_][A-Z0-9_]*` contract. Declared `local` so it doesn't leak to the calling shell — `gstack-gbrain-lib.sh` is documented as a sourced helper, so a bare assignment would mutate the caller's locale for the rest of the process (silently affecting downstream `sort`, `tr`, locale-aware globs in the same shell, etc.). The existing regression test `test/gbrain-lib-verify.test.ts:'rejects invalid var names'` already covers the macOS repro shape (passes `lower-case` and expects the validator to reject + emit `invalid var name`). On Linux CI the test silently passed because `LC_ALL=C` is the typical default; on macOS dev boxes it fails. Verified: - `bun test test/gbrain-lib-verify.test.ts`: 22 pass, 0 fail (on macOS). - `_gstack_gbrain_validate_varname lower-case; echo $?` → 2. - `_gstack_gbrain_validate_varname FOO_BAR; echo $?` → 0. - Caller's LC_ALL preserved across calls (confirmed via sourced bash).