dots

#!/usr/bin/env bash

shopt -s nullglob
declare -a ignored=("." ".." "README.md" ".git" "dots")
declare -al commands=("sync" "install" "link" "backup" "clean")
declare DOTS_DIR

if [ -z "$DOTS_DIR" ]; then
  if [ -e "$(pwd)/dots" ]; then
    DOTS_DIR="$(pwd)"
  else
    echo "Install 'dots' using $(dirname "$0")/install script"
    exit
  fi
fi

declare -a files=($DOTS_DIR/.*)

function __copy_dotfile_to_home { "/usr/bin/rsync" "-a" "$DOTS_DIR/$(basename "$1")" "$HOME"; }
function __symlink_dotfile_to_home { "/bin/ln" "-s" "$DOTS_DIR/$(basename "$1")" "$HOME/$(basename "$1")"; }
function __create_backup_dotfile { mv "$HOME/$(basename "$1")" "$HOME/$(basename "$1").bak"; }
function __remove_backup_dotfile { "/bin/rm" "-r" "$HOME/$(basename "$1").bak"; }
function __sync_existing_dotfile {
  if [ -L "$HOME/$(basename "$1")" ]; then
    echo "$1 is the symlink… skipping"
  else
    "/usr/bin/rsync" "-a" "$HOME/$(basename "$1")" "$DOTS_DIR/";
  fi
}

function __loop {
  for file in "${files[@]}"; do
    if ! [[ ${ignored[*]} =~ $(basename "$file") ]]; then
      $1 "$file"
    fi
  done
}

function __exec_command { echo "$2"; __loop "$1"; echo "$3"; }

function __install { __exec_command __copy_dotfile_to_home "copying dotfiles…" "dotfiles copied!"; }
function __sync { __exec_command __sync_existing_dotfile "syncing existing commands…" "dotfiles synced!"; }
function __link { __exec_command __symlink_dotfile_to_home "linking dotfiles…" "dotfiles linked!"; }
function __backup { __exec_command __create_backup_dotfile "creating backups…" "dotfiles backed up as .bak files."; }
function __clean { __exec_command __remove_backup_dotfile "cleaning up backups…" "backups cleaned up!"; }

if [ "$1" == "install" ]; then __install; fi
if [ "$1" == "sync" ]; then __sync ; fi
if [ "$1" == "link" ]; then __link; fi
if [ "$1" == "backup" ]; then __backup; fi
if [ "$1" == "clean" ]; then __clean; fi

if ! [[ ${commands[*]} =~ $1 ]]; then
  exec echo "
  usage: dots [option]

  available options:
    sync     copy dotfiles from $HOME into this repository
    install  copy dotfiles from this repository into $HOME
    link     symlink dotfiles from this repository into $HOME
    backup   create backup files for all dotfiles in $HOME
    clean    remove backup files in $HOME

  dots are located in $DOTS_DIR
"
fi

unset ignored files commands