#!/usr/bin/env bash
# Installs system-level config that stow can't manage (needs root).
set -euo pipefail

repo="$(cd "$(dirname "$0")" && pwd)"

# pacman: shared [options] snippet
if cmp -s "$repo/pacman/options.conf" /etc/pacman.d/options.conf; then
    echo "pacman: /etc/pacman.d/options.conf already up to date"
else
    sudo install -m644 "$repo/pacman/options.conf" /etc/pacman.d/options.conf
    echo "pacman: installed /etc/pacman.d/options.conf"
fi

# The Include goes at the end of [options] (just before the first repo section,
# commented or not), so later-wins options like ParallelDownloads override
# pacman.conf's own defaults. Any old copy (e.g. straight after [options]) is
# removed first, along with the blank line written after it, so re-running this
# moves it into place without piling up blank lines.
include='Include = /etc/pacman.d/options.conf'
tmp="$(mktemp)"
awk -v inc="$include" '
    $0 == inc { drop_blank = 1; next }
    drop_blank && $0 == "" { drop_blank = 0; next }
    { drop_blank = 0 }
    seen && !done && /^#?\[/ { print inc; print ""; done = 1 }
    /^\[options\]/ { seen = 1 }
    { print }
' /etc/pacman.conf >"$tmp"
if cmp -s "$tmp" /etc/pacman.conf; then
    echo "pacman: /etc/pacman.conf already includes it at the end of [options]"
else
    sudo install -m644 "$tmp" /etc/pacman.conf
    echo "pacman: added the Include to the end of [options] in /etc/pacman.conf"
fi
rm -f "$tmp"

# What pacman actually ends up using
echo "pacman: now using: $(pacman-conf Color ILoveCandy VerbosePkgLists ParallelDownloads | paste -sd, - | sed 's/,/, /g')"