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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
muffle [--] COMMAND...
muffle -h
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help show this message
COMMAND the COMMAND to be muffled
Conditionally omit STDOUT and STDERR of COMMAND:
if command exits with an error, print its original output to the
corresponding streams, but when there is no error, throw the
output away, "muffling" the COMMAND.
Examples:
Only print anything if the test fails:
$ muffle sh tests/assert-makefile.sh
EOF
}
for flag in "$@"; do
case "$flag" in
(--)
break
;;
(--help)
usage
help
exit
;;
(*)
;;
esac
done
while getopts 'h' flag; do
case "$flag" in
(h)
usage
help
exit
;;
(*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
OUT="$(mkstemp)"
ERR="$(mkstemp)"
STATUS_F="$(mkstemp)"
trap 'rm -f "$OUT" "$ERR" "$STATUS_F"' EXIT
timed() {
ts -s -m '%.s'
}
echo 0 > "$STATUS_F"
{
{ "$@" || echo $? > "$STATUS_F"; } | timed | pre out > "$OUT"
} 2>&1 | timed | pre err > "$ERR"
STATUS="$(cat "$STATUS_F")"
if [ "$STATUS" != 0 ]; then
cat "$OUT" "$ERR" |
sort -k2 | while read -r line; do
if [ "$(echo "$line" | cut -d' ' -f1)" = 'out:' ]; then
echo "$line" | cut -d' ' -f3- >&1
else
echo "$line" | cut -d' ' -f3- >&2
fi
done
exit "$STATUS"
fi
|
