update_symlinks.sh

#!/usr/bin/env bash
set -e

cd "$(dirname "$0")"
export DOTFILES_PATH=$HOME/perso/dotfiles
export PATH=$DOTFILES_PATH/bin:$PATH

link_file () {
  echo "linking $1 to $2"
  local src=$1 dst=$2
  local overwrite= backup= skip=
  local action=

  if [ -f "$dst" -o -d "$dst" -o -L "$dst" ]
  then
    if [ "$overwrite_all" == "false" ] && [ "$backup_all" == "false" ] && [ "$skip_all" == "false" ]
    then
      local currentSrc="$(readlink $dst)"
      if [ "$currentSrc" == "$src" ]
      then
        skip=true;
      else
        echo "File already exists: $dst ($(basename "$src")), what do you want to do?\n\
        [s]kip, [S]kip all, [o]verwrite, [O]verwrite all, [b]ackup, [B]ackup all?" 1
        read -n 1 action
        case "$action" in
          o )
            overwrite=true;;
          O )
            overwrite_all=true;;
          b )
            backup=true;;
          B )
            backup_all=true;;
          s )
            skip=true;;
          S )
            skip_all=true;;
          * )
            ;;
        esac
      fi
    fi

    overwrite=${overwrite:-$overwrite_all}
    backup=${backup:-$backup_all}
    skip=${skip:-$skip_all}

    if [ "$overwrite" == "true" ]
    then
      rm -rf "$dst"
      echo "removed $dst" 2
    fi

    if [ "$backup" == "true" ]
    then
      mv "$dst" "${dst}.backup"
      announce "moved $dst to ${dst}.backup" 2
    fi

    if [ "$skip" == "true" ]
    then
      announce "skipped $src" 2
    fi
  fi

  if [ "$skip" != "true" ]  # "false" or empty
  then
    ln -s "$1" "$2"
    announce "linked $1 to $2" 2
  fi
}

install_dotfiles () {
  echo 'installing dotfiles' 1
  local overwrite_all=false backup_all=false skip_all=false
  for src in $(find -H "$DOTFILES_PATH/modules" -maxdepth 2 -name '*.symlink' -not -path '*.git*' | grep -v modules/config)
  do
    dst="$HOME/.$(basename "${src%.*}")"
    link_file "$src" "$dst"
  done

  for src in $(find -H "$DOTFILES_PATH/modules/config" -maxdepth 2 -name '*.symlink' -not -path '*.git*')
  do
    dst="$HOME/.config/$(basename "${src%.*}")"
    link_file "$src" "$dst"
  done
}

install_dotfiles