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#!/usr/bin/env bash
# vim: ts=4 sw=4 noet ft=sh
#
# Example script to process Fangfrisch News.
declare -r MAILFROM="noreply"
declare -r MAILTO="alice@example.com"
declare -r SUBJECT="Fangfrisch News are available"
# Pick one of the following options and uncomment the 'declare'
# statements. Otherwise, the script will not run otherwise.
# Option 1: Mutt
#declare -r MAILAPP="mutt"
#declare -r MAILAPP_OPT=( "-s" "$SUBJECT" "$MAILTO" )
# Option 2: sendmail
#declare -r MAILAPP="sendmail"
#declare -r MAILAPP_OPT=( "-t" )
#export PATH="$PATH:/usr/sbin"
# Option 3: swaks
#declare -r MAILAPP="swaks"
#declare -r MAILAPP_OPT=( "-d" "-" "-f" "$MAILFROM" "-t" "$MAILTO" )
### No changes required below this line ###
set -euo pipefail
die() {
echo >&2 "$@"
exit 1
}
usage() {
die "Usage: $(basename "$0") {directory}"
}
gen_header() {
cat <<EOT
From: Fangfrisch News <$MAILFROM>
To: $MAILTO
Subject: $SUBJECT
EOT
# Mail header must end with an empty line!
}
declare -a NEWSITEMS=()
report_news() {
local dir=$1 ni
[ -d "$dir" ] || die "$dir is not a directory"
while IFS= read -r -d '' ni; do
if [ ${#NEWSITEMS[*]} -eq 0 ] && [ "$MAILAPP" != mutt ]; then
# Mutt does not need the header, others do.
gen_header
fi
NEWSITEMS+=( "$ni" )
echo -e "\n### $(basename "$ni"):\n"
cat "$ni"
done < <(find "$dir" -maxdepth 1 -type f -name "fangfrisch*.txt" -print0)
}
main() {
local t
[ -n "$MAILAPP" ] || die "MAILAPP is undefined, exiting."
if tty -s; then
# Running in a terminal session
t=$(mktemp)
# shellcheck disable=SC2064
trap "rm $t" EXIT
report_news "$@" | tee "$t" || exit 1
[ ! -s "$t" ] || "$MAILAPP" "${MAILAPP_OPT[@]}" >/dev/null <"$t"
else
report_news "$@" 2>&1 | "$MAILAPP" "${MAILAPP_OPT[@]}" >/dev/null
[ ${#NEWSITEMS[*]} -eq 0 ] || rm -v "${NEWSITEMS[@]}"
fi
}
[ $# -ge 1 ] || usage
main "$@"
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