#!/usr/bin/env bash

shopt -s nullglob

remove_empty_directories() {
    find . -depth -type d |
        sed 's|^\./||' |
        grep -Ev '^\.$|^\.svn/|/\.svn/|/\.svn$|^\.hg/|^\.hg$|^\.git/|^\.git$' |
        while read -r d; do
	    for f in "$d"/{*,.*}; do
		if ! [ -e "$f" ]; then
		    rmdir "$d"
		fi
		break
	    done
	done
}

if [ $# = 0 ]; then
  # shellcheck source=clean-source-tree
  . "$0" .
else
  for d in "$@"; do
  (
    if cd "$d"; then
      if [ -e .svn ]; then
        if ! type -p svn >&/dev/null; then
          echo "$0: svn: not found."
          exit 0
        fi
        "$(dirname "$0")"/list-non-source-files |
          while read -r f; do
	    if [ "$f" != "TAGS" ]; then rm -rf -- "$f"; fi;
	  done
      elif [ -e .git ] || [ -e ../.git ]; then
        if ! type -p git >&/dev/null; then
          echo "$0: git: not found."
          exit 0
        fi
        git clean -f -d -x -e TAGS >/dev/null
        remove_empty_directories
      elif [ -e .hg ] || [ -e ../.hg ]; then
        if ! type -p hg >&/dev/null; then
          echo "$0: hg: not found."
          exit 0
        fi
        hg purge --all
      else
        echo "$0: $d: not administered by Subversion, Git or Mercurial."
      fi
    fi
  )
  done
fi