Prevent wercker cli from polluting project directories

wercker_rc.sh

# Prevent wercker from polluting repositories
#
# Usage:
# Add this to your .bashrc or .zshrc
function wercker() {
  # To prevent collisions between projects (i.e., directories) with the same
  # name in different locations in your file system, we append a SHA of the
  # project path to the project name.
  project_name=$(basename $(pwd))-$(shasum <(pwd)|awk '{print $1}')
  wercker_dir=~/.wercker/projects/$project_name

  # Capture global options.
  global_opts=()
  # Use environment from `.env` file if it exists
  if [ -f .env ]; then
    global_opts+=(--environment <(sed -e '/^[ ]*#/d' -e '/^[:space:]*$/d' -e 's/^[ ]*export \(.*\)$/export X_\1/g' .env))
  fi

  while [[ "$1" =~ '^--' ]]; do
    if [[ "$1" = "--environment" ]]; then
      global_opts+=($1)
      shift
    fi
    global_opts+=($1)
    shift
  done

  if [[ "$#" -ge 1 ]]; then
    command=$1
    shift
  fi

  # Write wercker artifacts to `$wercker_dir`.
  command_opts=()
  if [[ "$command" =~ '^(b|build|dev|d|deploy|check-config)$' ]]; then
    command_opts+=(--working-dir $wercker_dir)
  fi
  
  command wercker $global_opts $command $command_opts $@
}