Fix cases like
eval my-cmd (commandline -o)
complete -C "my-cmd $(commandline -o)"
In both cases, we spuriously evaluate tokens like "(inside-quoted-string)"
as command substitutions. Fix this by escaping the strings. The momentarily
regresses the intended purpose of "eval" -- to expand variables -- but the
next commit will fix that.
This used `realpath -eq`, which for GNU realpath:
1. Suppresses "most error messages" (-q)
2. Requires that all parts exist (rather than allowing the last not
to)
Since we don't actually need a real path here, just filter.
Fixes#9099
If $xdg_chache_home is empty, this is not a valid fish expression:
[ \( -z \) -o \( ! -d \) ]
and results into an error.
While at it, also use $XDG_CACHE_HOME if that directory does not exist.
This seems better than falling back to $HOME/.cache, which the user has
explicitly overridden via $XDG_CACHE_HOME.
