void-packages/common/environment/setup/vsed.sh
Doan Tran Cong Danh bbce69f036 vsed: reduce number of digest cmd call
For a vsed call to `nf' files and `nr' regex,
the old code will make `2 * nf * nr' digest calls.
the new code will make `nf * (nr + 1)' digest calls.

Refereance: https://github.com/void-linux/void-packages/issues/11238
2019-05-14 16:33:30 +02:00

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# Helper function for calling sed on files and checking if the
# file is actually changed
#
# NOTE: this will not check if the input is valid, you can problably
# make it execute arbirtrary commands via passing '; cmd' to a vsed
# call.
vsed() {
local files=() regexes=() OPTIND OPTSTRING="ie:" has_inline=
eval set -- $(getopt -s bash "$OPTSTRING" "$@");
while getopts "$OPTSTRING" opt; do
case $opt in
i) has_inline=1 ;;
e) regexes+=("$OPTARG") ;;
*) ;;
esac
done
if ! [ "$has_inline" ]; then
msg_red "$pkgver: vsed: you must specify -i.\n"
return 1
fi
shift $(($OPTIND - 1))
if [ ${#regexes[@]} -eq 0 ] && [ $# -ge 2 ]; then
regexes+=("$1")
shift
fi
if [ ${#regexes[@]} -eq 0 ]; then
msg_red "$pkgver: vsed: no regexes specified.\n"
return 1
fi
for i; do
files+=("$i")
done
if [ ${#files[@]} -eq 0 ]; then
msg_red "$pkgver: vsed: no files specified.\n"
return 1
fi
for f in "${files[@]}"; do
olddigest="$($XBPS_DIGEST_CMD "$f")"
olddigest="${olddigest%% *}"
for rx in "${regexes[@]}"; do
sed -i "$f" -e "$rx" || {
msg_red "$pkgver: vsed: sed call failed with regex \"$rx\" on file \"$f\"\n"
return 1
}
newdigest="$($XBPS_DIGEST_CMD "$f")"
newdigest="${newdigest%% *}"
if [ "$olddigest" = "$newdigest" ]; then
msg_warn "$pkgver: vsed: regex \"$rx\" didn't change file \"$f\"\n"
fi
olddigest="${newdigest}"
done
done
}