[Bug 46441] sh(1): Does not support PS1, PS2, PS4 parameter expansion

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=46441

Matthew Phillips <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]
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--- Comment #18 from Matthew Phillips <[email protected]> ---
I've implemented parameter expansion support for PS1/PS2/PS4 prompts.

The patch adds support for:
- Simple variables: $USER, $PWD, $HOSTNAME
- Braced variables: ${USER}, ${HOME}
- Special parameters: $$, $?, $!
- Positional parameters: $0, $1, etc.

Tested via some shell scripts. The tests in tests/ weren't interactive and PS1
requires it. Please advice if some test cases are needed and how to add them.

Note: This implements parameter expansion only. Command substitution $(cmd) is
not yet supported and would require additional work.

Attachment below.

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