#!/bin/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

# Needed fo notify-send to work properly when called fron cronjob
DISPLAY=":0.0"

# Sync accounts passed as argument or all.
if [ "$#" -eq "0" ]; then
    accounts="$(awk '/^Group/ {print $2}' "$HOME/.config/mbsync/mbsyncrc")"
else
    for arg in "$@"; do
        [ "${arg%${arg#?}}" = '-' ] && opts="${opts:+${opts} }${arg}" && shift 1
    done
    accounts=$*
fi

pkill -RTMIN+6 "${STATUSBAR:-dwmblocks}"
# Parallelize multiple accounts
for account in $accounts; do
    # Check account for new mail. Notify if there is new content.
    acc="$(echo "$account" | sed "s/.*\///")"
    mbsync -c ~/.config/mbsync/mbsyncrc "$acc"
    new="$(find "$HOME/.local/share/mail/$acc/INBOX/new/" "$HOME/.local/share/mail/$acc/Inbox/new/" "$HOME/.local/share/mail/$acc/inbox/new/" -type f -newer "/tmp/.mailsynclastrun" 2>/dev/null)"
    newcount="$(echo "$new" | sed '/^\s*$/d' | wc -l)"
    if [ "$newcount" -gt "0" ]; then
        # notify-send -i mutt -c mailtotal "Mail" "$newcount new mail(s) in \`$acc\` account." &
        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 -i mutt "$from:" "$subject" &
        done
    fi
done

wait

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 "/tmp/.mailsynclastrun"
pkill -RTMIN+6 "${STATUSBAR:-dwmblocks}"