Re: About `M-C-e` expand result `'` failed

[A4-Tacks]

I think the results can be processed through methods such as `printf %q` or 
`"${result@Q}"`



---- Replied Message ----
| From | Zachary Santer<zsanter@gmail.com> |
| Date | 01/30/2024 22:11 |
| To | A4-Tacks<wdsjxhno1001@163.com> |
| Cc | bug-bash@gnu.org |
| Subject | Re: About `M-C-e` expand result `'` failed |
On Tue, Jan 30, 2024 at 6:48 AM Zachary Santer <zsanter@gmail.com> wrote:

Would it be unreasonable to expect that the argument to the outermost echo 
after M-C-e still be in double-quotes? Or potentially placed in single-quotes. 
That way, the line would be evaluated the same way as it would've been without 
M-C-e.
Double-quoting is probably the way to go in that case, but then the M-C-e logic 
has to also be smart enough to backslash escape things so the line gets 
evaluated the same way as it otherwise would've been. And single-quotes should 
be left in place as well.


$ var='foo'
$ echo "$( echo '${var}' )" # enter
${var}
$ echo "$( echo '${var}' )" # M-C-e
$ echo ${var} # enter
foo
# Would've expected: echo "\${var}"
$ echo $( echo '${var}' ) # enter
${var}
$ echo $( echo '${var}' ) # M-C-e
$ echo ${var} # enter
foo
# Would've expected: echo \${var}
$ echo '${var}' # enter
${var}
$ echo '${var}' # M-C-e
$ echo ${var} # enter
foo
# Would've expected: echo '${var}'
$ echo "${var}" # enter
foo
$ echo "${var}" # M-C-e
$ echo foo
foo

# Would've expected: echo "foo"


From the manual:
> shell-expand-line (M-C-e)
>      Expand the line as the shell does. This performs alias and history 
> expansion as well as all of the shell word expansions. See HISTORY EXPANSION 
> below for a description of history expansion.

Doesn't list quote removal.