#!/usr/bin/env bash

###############################################################################
#  Install dotfiles as a bare git repository. Conflicting files found during  #
#              installation are moved to $HOME/dotfiles.backup.               #
#                              Dependencies: git                              #
###############################################################################

set -o errexit
export GIT_WORK_TREE="$HOME"
export GIT_DIR="$GIT_WORK_TREE/.dotfiles"
backupdir="$GIT_WORK_TREE/dotfiles.backup"
repository="https://github.com/potamides/dotfiles.git"
exclude=(".gitmodules" "README.md" "LICENSE" ".local/bin/install-*")

function clone(){
  cd "$GIT_WORK_TREE"
  git clone --bare "$repository" "$GIT_DIR"
}

function backup(){
  for file in $(git ls-tree -r --name-only HEAD); do
    if [[ -e "$file" ]]; then
      mkdir -p "$backupdir"
      mv "$file" "$backupdir"
    fi
  done
}

function install(){
  git checkout
  git submodule update --init
  git config status.showUntrackedFiles no
  git config core.worktree "$GIT_WORK_TREE"
  git config alias.edit '!env -C "${GIT_PREFIX:-.}" $EDITOR'
  git sparse-checkout set "*" "${exclude[@]/#/\!}" --no-cone
}

clone
backup
install