[REQUEST] sh filetype quotation highlighting of subshells

[thoughtpatterns]

Feature

The command substitution section of the specification for POSIX shell specifies:

The results of command substitution shall not be processed for further tilde expansion, parameter expansion, command substitution, or arithmetic expansion. If a command substitution occurs inside double-quotes, field splitting and pathname expansion shall not be performed on the results of the substitution.

Currently when syntax highlighting a subshell such as "$(printf "a b c")", the quotation marks will be parsed such that "$(printf " would be quoted, a b c would be unquoted, and ")" would be quoted; the current behavior (to my knowledge) somewhat obscures what is actually quoted.

Would it be possible to show the inside of a quoted subshell as unquoted? For example, "$(printf "a b c")" would show "$( as quoted (outside the subshell), printf as unquoted, "a b c" as quoted (inside the subshell), and )" as quoted (outside the subshell). Thank you!

Usecase

No response

[pjungkamp]

That is a fundamental issue with the current regions highlighter that affects all programming languages with recursive highlighters and substitutions. The only solution I found is to discard the builtin kakoune highlighters all-together and use https://sr.ht/~hadronized/kak-tree-sitter instead.

Some other examples:

• Python:

# python
l = [ "a", "b", "c" ]
print(f"string { "|".join(l) }") # <---

• JavaScript: js: nested template highlighting #1670

let l = [ "a", "b", "c" ]
console.log(`${ l.join(`|`) }`) # <---

• Nix: nix.kak parse a certain nested string expression incorrectly #3865

# nix
let l = [ "a" "b" "c" ];
in "${ lib.concatStringsSep "|" l }" # <---

[alexherbo2]

If you define the subshell region it should be possible no ?