VIM highlights valid POSIX shell syntax as errorneous

[andrewshadura]

As I noted in [1], POSIX specifies both $(…) syntax and $((…)), see §2.6.3 and §2.6.4.

However, the current VIM version highlights both of those as invalid syntax when #!/bin/sh shebang is used.

[jamessan]

:help ft-sh-syntax describes how to make the sh syntax default to POSIX.

When you see the erroneous highlighting, does :echo b:is_sh show 1? If so, then the auto-detection of whether /bin/sh is a POSIX shell didn't get triggered and you don't have let g:is_posix = 1 in your vimrc, so the highlighting is defaulting to Bourne syntax.

[chrisbra]

Closing, as this behaviour is documented. Please ask user questions on the appropriate forums. Thanks.

[andrewshadura]

@chrisbra, why have you closed it? It is documented, yet it is wrong, and has to be changed.

[chrisbra]

I think it is configurable, so please read the relevant help section :h ft-sh-syntax

[andrewshadura]

I did read it, it didn’t answer my question. Korn shell isn’t the same as POSIX shell, and it’s 2016, there probably are very few machines having the original Bourne shell as /bin/sh. Is it good to still assume /bin/sh is non-POSIX-compliant?

[chrisbra]

I don't know. You might want to discuss this issue with Charles as maintainer of the file.