Swap php versions automatically using phpbrew

swap_php.bash

#
# Find up a file in a directory hierarchy.
#
# @param $1 File to find
#
# @return Path to the nearest file location.
#
# @see http://unix.stackexchange.com/questions/6463/find-searching-in-parent-directories-instead-of-subdirectories
#
find_up() {
  DIR=$(pwd)
  while [[ "$DIR" != "" && ! -e "$DIR/$1" ]]; do
    DIR=${DIR%/*}
  done
  [ ! -z "$DIR" ] && echo "$DIR/$1"
}

# Keep track of last swapped php version
LAST_PHP_VERSION="off"

# Set these to 1 to print messages when swapping php versions
SWAP_PHP_VERBOSE=0
SWAP_PHP_DEBUG=0

#
# Swaps php versions using phpbrew
#
# If there's a ".php-version" file in the current dir or in any of its parents, this function will
# swap the current php version to the one specified in the file. If there are multiple
# ".php-version" files among the directory hierarchy, the nearest file is used.
#
# @see https://github.com/phpbrew/phpbrew
#
# @param $1 Current working dir
#
swap_php_version() {
  [ $SWAP_PHP_DEBUG -eq 1 ] && echo "Running swap_php_version()..."
  FILE=$(find_up .php-version)
  [ $SWAP_PHP_DEBUG -eq 1 ] && echo "FILE=$FILE"

  if [ ! -z "$FILE" ]; then
    VERSION=$(<$FILE)

    if [ "$VERSION" != "$LAST_PHP_VERSION" ]; then
      phpbrew use $VERSION
      LAST_PHP_VERSION=$VERSION
      [ $SWAP_PHP_VERBOSE -eq 1 ] && echo "PHP version swapped to $VERSION"
    fi

  elif [ "$LAST_PHP_VERSION" != "off" ]; then
    phpbrew off > /dev/null
    LAST_PHP_VERSION="off"
    [ $SWAP_PHP_VERBOSE -eq 1 ] && echo "PHP version swapped to system default"
  fi
}

# Keep track of last dir
LAST_PHP_DIR=""

swap_php_version_when_cd() {
  [ $SWAP_PHP_DEBUG -eq 1 ] && echo "Running swap_php_version_when_cd()..."

  CURRENT_DIR=$(pwd)

  if [ "$LAST_PHP_DIR" != "$CURRENT_DIR" ]; then
    LAST_PHP_DIR=$CURRENT_DIR
    swap_php_version $@
  fi
}

PROMPT_COMMAND="swap_php_version_when_cd"