Re: Strange re-initialization of array. Bug or feature?
On 11/27/12 7:37 PM, Tim Friske wrote: If sourced at least twice from another script I get the following output printed: AAA BBB declare -A ONCE='()' CCC declare -A ONCE='([std.bash]=1 )' BBB declare -Ai ONCE='()' CCC declare -Ai ONCE='([std.bash]=1 )' If I remove the initialization =() from declare -gAi ONCE I get the following output printed: AAA BBB declare -Ai ONCE='()' CCC declare -Ai ONCE='([std.bash]=1 )' BBB declare -Ai ONCE='([std.bash]=1 )' The declare -gAi ONCE=() seems to get executed every time although surrounded by [[ ! -v ONCE ]] whereas echo AAA within the same if-block only the first time. Is this a bug or feature? This is the same bug I described earlier today, with the same fix. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, ITS, CWRUc...@case.eduhttp://cnswww.cns.cwru.edu/~chet/
Strange re-initialization of array. Bug or feature?
Hi folks,
I execute the following code with Bash version GNU bash, Version
4.2.39(1)-release (x86_64-redhat-linux-gnu) on Fedora 17:
# Returns 0 else 1 if the sourcing (source) script isn't keyed by its base
name in the global ONCE array yet.
#
# A script should include this script near the top with source me_once ||
return 0 in order to get sourced itself only
# once.
#
# @return 0 on success, n != 0 on failure.
#
function me_once {
unset -f me_once
if [[ ! -v ONCE ]]; then
echo AAA
declare -gAi ONCE=()
fi
echo BBB
declare -p ONCE
declare -r a=${BASH_SOURCE[2]##*/}
if (( ${ONCE[$a]:+1} )); then
return 1
else
ONCE+=([$a]=1)
echo CCC
declare -p ONCE
fi
}
me_once
If sourced at least twice from another script I get the following output
printed:
AAA
BBB
declare -A ONCE='()'
CCC
declare -A ONCE='([std.bash]=1 )'
BBB
declare -Ai ONCE='()'
CCC
declare -Ai ONCE='([std.bash]=1 )'
If I remove the initialization =() from declare -gAi ONCE I get the
following output printed:
AAA
BBB
declare -Ai ONCE='()'
CCC
declare -Ai ONCE='([std.bash]=1 )'
BBB
declare -Ai ONCE='([std.bash]=1 )'
The declare -gAi ONCE=() seems to get executed every time although
surrounded by [[ ! -v ONCE ]] whereas echo AAA within the same if-block
only the first time.
Is this a bug or feature?
Cheers,
Tim
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