env/bin/screenshot.sh

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#!/bin/sh
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# screenshot
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# Written in 2019-2020 by Lucas
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# CC0 1.0 Universal/Public domain - No rights reserved
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty. You should have received a copy of the CC0 Public Domain
# Dedication along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
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usage()
{
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cat - <<. >&2
Usage:
${0##*/}
${0##*/} -id id
${0##*/} -name name
${0##*/} -window
.
exit 1
}
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err()
{
printf "%s: %s\n" "${0##*/}" "$*" >&2
exit 1
}
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case $# in
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0)
set -- -root
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;;
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1)
[ "$1" = "-window" ] || err "unknown option $1"
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set --
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;;
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2)
[ "$1" = "-id" ] || [ "$1" = "-name" ] || err "unknown option $1"
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[ -n "$2" ] || err "$1 expects a non-empty parameter"
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;;
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*)
usage
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;;
esac
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: ${SCREENSHOTS:=~/media/ss}
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xwd -silent "$@" |
xwdtopnm |
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pnmtopng >"$SCREENSHOTS/$(date +%Y%m%d-%H%M%S).png"