GitLab

Use `mapc' rather than `mapcar'.

(sh-font-lock-syntactic-keywords): Use them to distinguish the
different possible cases for \'.
(sh-font-lock-paren): Mark the relevant text with font-lock-multiline.

whole $( rather than just the $.  Rename from sh-quoted-subshell.
(sh-font-lock-syntactic-keywords): Adjust call accordingly.

(sh-quoted-subshell): Rewrite to handle nested mixes of `...` and $(...).
(sh-apply-quoted-subshell): Remove.
(sh-font-lock-syntactic-keywords): Adjust call to sh-quoted-subshell.

(sh-font-lock-syntactic-keywords): Use them to distinguish the
different possible cases for \'.

that it's been made unnecessary by removing narrowing.

control flow a bit, simplify another bit, and add comments.

(sh-quoted-subshell): New helper function to search for a possibly nested
subshell (like `` or $()) within a "" quoted string.
(sh-font-lock-keywords-var): Add sh-quoted-exec for Bash.
(sh-apply-quoted-subshell): Flag quote characters inside a subshell, which is
itself already in a quoted region, as punctuation, since this is the closest
to what they actually are.
(sh-font-lock-syntactic-keywords): Add sh-quoted-subshell and
sh-apply-quoted-subshell.
(sh-font-lock-syntactic-face-function): Apply the new face for text inside ``
instead of the old font-lock-string-face.

the default shell if filename is not available.

(sh-here-doc-open-re, sh-font-lock-close-heredoc): Use it.
(sh-font-lock-open-heredoc): Try to properly handle heredoc starters
whose line is either continued or ends with a comment.