#!/usr/bin/env bash
# One command, whole answer: is this machine's dotfiles state committed,
# pushed, and does the package manifest still match reality?
#
# With --nag it prints nothing when everything is clean. That silence is the
# point: a login banner that always fires is a banner you stop reading.
set -uo pipefail
REPO="${DOTFILES:-$HOME/.dotfiles}"
HOST="${DOTFILES_HOST:-$(hostname | tr '[:upper:]' '[:lower:]')}"
NAG=0; [[ "${1:-}" == "--nag" ]] && NAG=1
cd "$REPO" 2>/dev/null || exit 0

dirty=$(git status --porcelain 2>/dev/null | wc -l)
ahead=0; behind=0
if git rev-parse --abbrev-ref '@{u}' >/dev/null 2>&1; then
  read -r behind ahead < <(git rev-list --left-right --count '@{u}...HEAD' 2>/dev/null || echo "0 0")
fi

pkgdrift=0
tmp=$(mktemp)
if command -v pacman >/dev/null 2>&1; then
  pacman -Qqen | sort > "$tmp"
  [[ -f "packages/${HOST}.pacman" ]] && ! diff -q "$tmp" "packages/${HOST}.pacman" >/dev/null && pkgdrift=1
elif command -v apt-mark >/dev/null 2>&1; then
  apt-mark showmanual | sort > "$tmp"
  [[ -f "packages/${HOST}.apt" ]] && ! diff -q "$tmp" "packages/${HOST}.apt" >/dev/null && pkgdrift=1
fi
rm -f "$tmp"

if (( NAG )); then
  (( dirty == 0 && ahead == 0 && behind == 0 && pkgdrift == 0 )) && exit 0
  printf '\033[33mdotfiles:\033[0m'
  (( dirty ))    && printf ' %d uncommitted' "$dirty"
  (( ahead ))    && printf ' %d to push' "$ahead"
  (( behind ))   && printf ' %d to pull' "$behind"
  (( pkgdrift )) && printf ' packages changed'
  printf '  \033[2m(dots)\033[0m\n'
  exit 0
fi

echo "repo:     $REPO  [$HOST]"
echo "branch:   $(git rev-parse --abbrev-ref HEAD)  ahead $ahead, behind $behind"
echo "dirty:    $dirty file(s)"
echo "packages: $( ((pkgdrift)) && echo 'manifest is stale — run pkg-snapshot' || echo 'manifest matches' )"
(( dirty )) && { echo; git status --short; }
exit 0