#!/bin/bash
# Pending updates for xmobar from update-notify's pending list, e.g. " 15/3 | " (repo/AUR), empty when none
# Entries already installed are dropped, so the count falls right after an upgrade. Orange from the threshold
# on, red "K" when a custom kernel needs a rebuild.
# With "list": show the pending packages in a notification (for a click on the bar)

file="${XDG_STATE_HOME:-$HOME/.local/state}/update-notify/pending"
[[ -r $file ]] || exit 0

mapfile -t entries < "$file"
names=()
for e in "${entries[@]}"; do
    read -r src pkg _ <<< "$e"
    [[ $src != threshold ]] && names+=("$pkg")
done

declare -A installed
if (( ${#names[@]} )); then
    while read -r pkg ver; do
        installed[$pkg]=$ver
    done < <(pacman -Q "${names[@]}" 2>/dev/null)
fi

threshold=0 repo=() aur=() kernel=()
for e in "${entries[@]}"; do
    read -r src pkg new <<< "$e"
    [[ $src == threshold ]] && { threshold=$pkg; continue; }
    have=${installed[$pkg]:-}
    [[ -z $have ]] && continue    # removed since the last run
    case $src in
        repo)   (( $(vercmp "$have" "$new") < 0 )) && repo+=("$pkg $new") ;;
        aur)    (( $(vercmp "$have" "$new") < 0 )) && aur+=("$pkg $new") ;;
        kernel) (( $(vercmp "${have%-*}" "${new%-*}") < 0 )) && kernel+=("$pkg (stock $new)") ;;
    esac
done

if [[ ${1:-} == list ]]; then
    body=""
    (( ${#repo[@]} )) && { printf -v l '%s\n' "${repo[@]}"; body+="Repo:"$'\n'"$l"; }
    (( ${#aur[@]} )) && { printf -v l '%s\n' "${aur[@]}"; body+="AUR:"$'\n'"$l"; }
    (( ${#kernel[@]} )) && { printf -v l 'Rebuild %s\n' "${kernel[@]}"; body+="$l"; }
    body=${body%$'\n'}
    notify-send "Pending updates" "${body:-None}"
    exit
fi

total=$(( ${#repo[@]} + ${#aur[@]} ))
(( total + ${#kernel[@]} )) || exit 0
text=$'\xef\x92\x87'" ${#repo[@]}/${#aur[@]}"    # nf-oct-package, as UTF-8 bytes so the locale doesn't matter
(( total >= threshold )) && text="<fc=#ffb86c>$text</fc>"
(( ${#kernel[@]} )) && text+=" <fc=#f7768e>K</fc>"
echo "$text | "