#!/usr/bin/env sh

# This script is symlinked to be present as both bin/shoes and bin/shoes-stub
# See ext/install/Rakefile for the full explanation of why we do that.


# What's this noise? For folks who don't have proper paths set up (i.e. not
# using a version manager), they might try to run `jruby -S shoes ...` but then
# Ruby tries to execute this file. This line gives a Ruby syntax error which
# shows our message here, pointing them how to fix things, while still being a
# no-op when run via shell.
: Oops... Try shoes-swt instead of shoes.

# Don't try to cd on an empty $NEXT_DIR (link in same directory)
mac_move_to_link_dir () {
  # Skip if already in link directory
  NEXT_DIR=$(dirname $1)
  if [[ -n "$NEXT_DIR" ]]; then
    cd $NEXT_DIR
  fi
}

mac_readlink_f () {
  # based on http://stackoverflow.com/questions/1055671/how-can-i-get-the-behavior-of-gnus-readlink-f-on-a-mac

  # A relative or absolute path to a file, potentially a symlink
  LINK=$1

  if [ ! -L "$LINK" ] ; then
    # Not a link, all good
    echo $LINK
    return
  fi

  # http://bosker.wordpress.com/2012/02/12/bash-scripters-beware-of-the-cdpath/
  unset CDPATH

  # Look up links until we find something that is not a symlink
  while [ -L "$LINK" ] ; do
    mac_move_to_link_dir $LINK
    RELATIVE_LINK=$(basename $LINK)
    LINK=$(readlink $RELATIVE_LINK)
  done

  # Now PATH is an unqualified file name, but we're in its directory, so turn
  # it into an absolute path by prefixing with the current working directory.

  PHYS_DIR=`pwd -P`
  RESULT=$PHYS_DIR/$LINK
  echo $RESULT
}

case "${MACHTYPE:-}${OSTYPE:-}" in
  (*darwin*)
    SCRIPT=$(mac_readlink_f $0);;
  (*)
    # see http://stackoverflow.com/a/1638397/1810896
    SCRIPT=$(readlink -f "$0");;
esac

SCRIPTPATH=$(dirname "$SCRIPT")

BACKEND_FILE="$SCRIPTPATH/shoes-backend"
if [ ! -e "$BACKEND_FILE" ]; then
  $SCRIPTPATH/shoes-picker $SCRIPTPATH

  STATUS=$?
  if [ $STATUS != 0 ]; then
    exit $STATUS
  fi
fi

BACKEND_COMMAND=$(cat $BACKEND_FILE)
SHOES_BIN_DIR=$SCRIPTPATH $BACKEND_COMMAND $@