#!/bin/sh

# merge directory contents with its parent directory.
# duplicates are renamed.

unique_path() {
  old="$1"
  new="$1"
  counter=0
  while test -e "$new"
  do
    counter=$(($counter + 1))
    new="$old.$(($counter + 1))"
  done
  printf "$new"
}

for a in "$@"
do
  if test -d "$a"
  then
    for b in "$a"/* "$a"/.*
    do
      name="$(basename "$b")"
      if ! echo "$name" | grep -qE '(\.|\.\.|\*)$'
      then
        target="$(unique_path "$a/../$name")"
        mv "$b" "$target"
      fi
    done
    rmdir "$a"
  fi
done