Re: [feature request] parameter transformation to safely add strings to PS1, &c.

[Alex fxmbsw7 Ratchev]

i meant this with removing quotes

~ $ shopt -s extglob ; a=( . a \' \$var $'\e[1m' ) ps='$ ' a=( "${a[@]@Q}"
) ; for i in ${!a[@]} ; do a[i]=${a[i]#?(\$)\'} a[i]=${a[i]%\'} ; done ;
ps+=${a[*]} ; printf %s\\n "$ps"
$ . a \ $var \E[1m
~ $

On Mon, Aug 23, 2021, 00:02 Emanuele Torre <torreemanuele6@gmail.com> wrote:

> Emanuele Torre <torreemanuele6@gmail.com> wrote:
> >   ~ --${@Q}-> '~' --${#\'}-> ~' --${%\'}-> ~
>
> Sorry, that was a bad example. Still, it does not accomplish anything:
>
>   \w --${@Q}-> '\w' --${#\'}-> \w' --${%\'}-> \w
>
> On Sun, 22 Aug 2021 at 23:56, Emanuele Torre <torreemanuele6@gmail.com>
> wrote:
> >
> > Alex fxmbsw7 Ratchev <fxmbsw7@gmail.com> wrote:
> > > and renoving the beginning and ending ' s
> >
> > even if you remove the first and last ':
> > 1) that is 3 PEs as the solution i described (${a//\\/\\\\}
> > ${a//\`/\\\`} ${a//$/\\$} vs ${a@Q} ${a#\'} ${a%\'} )
> > 2) it doesn't actually accomplish anything:
> >
> >   ~ --${@Q}-> '~' --${#\'}-> ~' --${%\'}-> ~
> >
> > On Sun, 22 Aug 2021 at 23:14, Alex fxmbsw7 Ratchev <fxmbsw7@gmail.com>
> wrote:
> > >
> > > what about @Q
> > > and renoving the beginning and ending ' s
> > >
> > >
> > > On Sun, Aug 22, 2021, 23:13 Emanuele Torre <torreemanuele6@gmail.com>
> wrote:
> > >>
> > >> It would be nice to have a parameter transformation (e.g. "${par@p}")
> > >> that expands $par to a string that will not be expanded by PS1, PS2,
> &c.
> > >>
> > >> example:
> > >>
> > >>   tmp_var=$(blabla) # this variable will not exist when PS1 is
> expanded
> > >>   PS1="blabla ${tmp_var@p} blabla"
> > >>
> > >> I think a valid way to achieve the same behaviour in the currenct
> > >> version of bash:
> > >>
> > >>   tmp_var=$(blabla)
> > >>   tmp_var=${tmp_var//\\/\\\\}
> > >>   tmp_var=${tmp_var//\`/\\\`}
> > >>   tmp_var=${tmp_var//$/\\$}
> > >>   PS1="blabla $tmp_var blabla"
> > >>
> > >> But a parameter transformation would be nicer.
> > >>
> > >> This parameter transformation should also make sure to not cause an
> > >> expansion when concatenated.
> > >>
> > >>   var='$'
> > >>   printf '%s\n' "${var@p}" # should not expand to `$'.
> > >>   PS1="${var@P}(date)" # because this should expand to `$(date)'
> > >>                        # and not to the output of `date'.
> > >>
> > >> Cheers,
> > >>   emanuele6
> > >>
>