On 19 July 2010 20:43, Mike Frysinger <[email protected]> wrote:
> On Monday, July 19, 2010 03:38:39 Ciaran McCreesh wrote:
>> On Sun, 18 Jul 2010 20:17:45 -0700 Alec Warner wrote:
>> > Can we do away with all the extra foo && return bullshit and just set
>> > a trap?
>> >
>> > trap "eshopts pop" RETURN
>> >
>> > ?
>>
>> That strikes me as a horribly fragile way of doing things that's bound
>> to come back and screw things up at some point...
>
> nifty in theory, but i'm inclined to agree with Ciaran
> -mike
Is something like the below function too hideous (not massively
tested, but it seems to work)? Usage is something like:
[dlever...@shiny-one ~] $ foo() { shopt -p extglob; }
[dlever...@shiny-one ~] $ eshopts_need foo -s extglob
[dlever...@shiny-one ~] $ shopt -p extglob
shopt -u extglob
[dlever...@shiny-one ~] $ foo
shopt -s extglob
[dlever...@shiny-one ~] $ shopt -p extglob
shopt -u extglob
eshopts_need() {
[[ $# -ge 1 ]] || die "eshopts_need needs at least one argument"
local func=$1
shift
local opts=( "$...@}" )
if [[ $1 == -[su] ]] ; then
eval "_eshopts_need_shopt_$(declare -f $func)"
eval "$func() {
local old=\$(shopt -p)
$(declare -p opts)
shopt \"\${op...@]}\"
_eshopts_need_shopt_$func \"\...@\"
local status=\$?
eval \"\$old\"
return \$status
}"
else
eval "_eshopts_need_set_$(declare -f $func)"
eval "$func() {
local old=\$-
$(declare -p opts)
set \"\${op...@]}\"
_eshopts_need_set_$func \"\...@\"
local status=\$?
set +\$-
set -\$old
return \$status
}"
fi
}
