>
> Some shells, such as csh, are very syntactically different from
> bash.
>

That should not be a problem for tree-sitter as, once the csh tree-sitter
library is loaded, the queries will only match the particular keywords and
built-in commands of csh.

However, I am able to test other shell variants as there is no tree-sitter
grammar for them. The only one I have access to is for bash, but as I said
I am trying to keep the implementation as generic as possible so, once
those grammars are available the effort to use them should be low.


> So won't you end up, in effect, reproducing the existing font-lock code?
>

That seems to be the case for the keyword fontification generated from the
`sh-font-lock-var*' variables. The only way I found to avoid this is to
explicitly specify the same regex queries for fontification used currently
in sh-mode in the tree-sitter queries. This will create duplication of data
but avoids the undesirable duplication of font-lock code.

-- 
João Paulo L. de Carvalho
Ph.D Computer Science |  IC-UNICAMP | Campinas , SP - Brazil
Postdoctoral Research Fellow | University of Alberta | Edmonton, AB - Canada
joao.carvalho@ic.unicamp.br
joao.carvalho@ualberta.ca