sync

#!/bin/sh

dot="$(cd "$0/.." && pwd)"
tmp=$(mktemp -d); trap "rm -r $tmp" EXIT
dir=$tmp/dir
sym=$tmp/sym
vim=$tmp/vim
git="$(for cfg in attributes config; do echo "-o -name .git$cfg"; done)"

cd "$HOME"

sync()
{
  if ! insync_dir; then
    comm -13z $dir/actual $dir/expect \
      | xargs -0r -n1 mkdir -pv | sed "s:^.\+ ':created ':"
  fi

  if ! insync_sym; then
    comm -23z $sym/actual $sym/expect \
      | cut -d: -f1 -z | xargs -0r rm -fv
    comm -13z $sym/actual $sym/expect \
      | cut -d: -f2 -z | xargs -0r -n1 ln -sv | sed "s:^'./:linked  ':"
  fi

  if ! insync_vim; then
    test -t 1 && printf '%s' "syncing '.vim/bundle/' ..."
    vim +PluginClean! +PluginInstall +qa -esu "$dot/.vimrc"
    test -t 1 && printf '\r\e[K'
    printf '%s\n' "synced  '.vim/bundle/'"
  fi
}

reset()
{
  git -C "$dot" clean -dffX .vim/bundle \
    | awk '$1 == "Removing" { print "removed \x27" $2 "\x27" }'

  insync_sym
  cat $sym/actual | cut -d: -f1 -z | xargs -0r rm -fv
}

check()
{
  insync_dir && insync_sym && insync_vim
}

insync_dir()
{
  which vim > /dev/null || return 0
  mkdir $dir

  for sub in swap temp undo; do printf %s\\0 .cache/vim/$sub; done \
    | sort -z > $dir/expect
  find .cache/vim -maxdepth 1 -mindepth 1 -type d -print0 2> /dev/null \
    | sort -z > $dir/actual

  diff $dir/actual $dir/expect > /dev/null
}

insync_sym()
{
  mkdir $sym

  find . -mindepth 1 -prune \
    -type l -lname "${dot#$HOME/}/*" \
    -printf '%f:%l\0' | sort -z > $sym/actual
  find "${dot#$HOME/}" -mindepth 1 -prune \
    \( -name '.*' ! -name '.git*' $git \) \
    -printf '%f:%p\0' | sort -z > $sym/expect

  diff $sym/actual $sym/expect > /dev/null
}

insync_vim()
{
  which vim > /dev/null || return 0
  mkdir $vim

  vim +PluginList +%p +qa -esu "$dot/.vimrc" \
    | awk -F "[/']" '$3 { print $3 }' | sort > $vim/expect
  find "$dot/.vim/bundle" -mindepth 1 -prune \
    -type d -printf '%f\n' | sort > $vim/actual

  diff $vim/actual $vim/expect > /dev/null
}

cmd="${1:-sync}"
case "$cmd" in
  check|reset|sync) $cmd ;;
  *) printf '%s\n' 'invalid subcommand'; exit 1 ;;
esac