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#!/bin/bash
# Reads stdin and periodically report the most recently seen output.
#
# Copyright (C) 2019 Peter Wu <peter@lekensteyn.nl>
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Like "travis_wait", it prevents a build timeout due to lack of progress.
# Additionally:
# - During execution it reports the most recent line instead of some fixed text.
# - It does not write the full output at the end of execution.
# - It does not impose a command timeout.
set -eu
# Default to a 60 seconds interval between printing messages.
PERIOD=${1:-60}
nexttime=$PERIOD
msg=
count=0
# Reset timer (SECONDS is a special Bash variable).
SECONDS=0
while true; do
# Periodically report the last read line.
timeleft=$((nexttime-SECONDS))
while [ $timeleft -le 0 ]; do
((nexttime+=PERIOD))
((timeleft+=PERIOD))
printf "[progress] %3d %s\n" $SECONDS "${msg:-(no output)}"
msg=
done
if read -r -t $timeleft line; then
# Save line for later.
((count+=1))
msg="Line $count: $line"
continue
elif [ $? -le 128 ]; then
# EOF (as opposed to a timeout)
[ -z "$msg" ] || printf "[progress] %3d %s\n" $SECONDS "$msg"
printf "[progress] %3d done (read %d lines).\n" $SECONDS $count
break
fi
done
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