#!/usr/bin/env sh
# Sync mail and give notification if there is new mail.

# Run only if user logged in (prevent cron errors)
pgrep -u "$USER" >/dev/null || exit
# Run only if not already running in other instance
pgrep -x mbsync >/dev/null && exit

# Checks for internet connection and set notification script.
ping -q -c 1 1.1.1.1 > /dev/null || exit
command -v notify-send >/dev/null || echo "Note that \`libnotify\` or \`libnotify-send\` should be installed for pop-up mail notifications with this script."

export DISPLAY=:0.0

notify() { notify-send "mutt" "📬 $2 new mail(s) in \`$1\` account." ;}

# Check account for new mail. Notify if there is new content.
syncandnotify() {
    acc="$(echo "$account" | sed "s/.*\///")"
    mbsync "$acc"
    new=$(find "$HOME/.local/share/mail/$acc/INBOX/new/" "$HOME/.local/share/mail/$acc/Inbox/new/" "$HOME/.local/share/mail/$acc/inbox/new/" -type f -newer "$HOME/.config/mutt/.mailsynclastrun" 2> /dev/null)
    newcount=$(echo "$new" | sed '/^\s*$/d' | wc -l)
    if [ "$newcount" -gt "0" ]; then
        notify "$acc" "$newcount" &
        for file in $new; do
            # Extract subject and sender from mail.
            from=$(awk '/^From: / && ++n ==1,/^\<.*\>:/' "$file" | perl -CS -MEncode -ne 'print decode("MIME-Header", $_)' | awk '{ $1=""; if (NF>=3)$NF=""; print $0 }' | sed 's/^[[:blank:]]*[\"'\''\<]*//;s/[\"'\''\>]*[[:blank:]]*$//')
            subject=$(awk '/^Subject: / && ++n == 1,/^\<.*\>: / && ++i == 2' "$file" | head -n-1 | perl -CS -MEncode -ne 'print decode("MIME-Header", $_)' | sed 's/^Subject: //' | sed 's/^{[[:blank:]]*[\"'\''\<]*//;s/[\"'\''\>]*[[:blank:]]*$//' | tr -d '\n')
            notify-send "﯍ $from:" "$subject" &
        done
    fi
}

# Sync accounts passed as argument or all.
if [ "$#" -eq "0" ]; then
    accounts="$(awk '/^Group/ {print $2}' "$HOME/.mbsyncrc")"
else
    accounts=$*
fi

# Parallelize multiple accounts
for account in $accounts
do
    syncandnotify &
done

wait

notmuch new 2>/dev/null

mu index --muhome=~/.cache/mu --maildir=~/.local/share/mail 2>/dev/null

#Create a touch file that indicates the time of the last run of mailsync
touch "$HOME/.config/mutt/.mailsynclastrun"