pickjdk shell function refactored from Nick Sieger's script

gistfile1.txt

#!/bin/bash
#
# Quicky Waynification of Nick's pickjdk
#

#
# pickjdk: for switching between Java versions:
# From Nick Sieger: http://pastie.org/170326
#   "I just symlink soylatte to:
#    /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0-soylatte/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0-soylatte"
#
pickjdk()
{
  : \
    "${SOYLATTE_HOME:="${HOME}/dev/java/src/soylatte/control/build/bsd-amd64"}" \
    "${SOYLATTE_32_HOME:="/usr/local/soylatte16-i386-1.0.3"}" \
    "${JAVA_1_7_0_HOME:="/usr/local/java-1.7.0"}"

  if [[ -z "${JDKS_ROOT:-}" ]]
  then
    if [[ -d "/System/Library/Frameworks/JavaVM.framework/Versions" ]]
    then
      JDKS_ROOT="/System/Library/Frameworks/JavaVM.framework/Versions"
    else
      echo "JDKS_ROOT must be set in order to use pickjdk."
      return 1
    fi
  fi

  local n=1 jdk total_jdks choice=0 current="$JAVA_HOME" explicit_jdk="" jdks=()

  local jdk_dirs=($(
    find "${JDKS_ROOT}" -iname '[0-9]*' -mindepth 1 -maxdepth 1 -type d
  ))

  for jdk in "${jdk_dirs[@]}"
  do
    echo -n " $n) ${jdk} ${jdk##*/}"

    if [[ "$OSTYPE" =~ *darwin* ]]
    then
      jdk="$jdk/Home"
    fi

    if [[ $jdk == "$current" ]]
    then
      echo " < CURRENT"
    else
      echo
    fi

    jdks[$n]="$jdk"
    (( n++ ))
    total_jdks=$n
  done

  echo " $n) Soylatte-amd64"
  jdks[$n]="$SOYLATTE_HOME"
  (( n++ ))

  echo " $n) Soylatte16-i386-1.0.3"
  jdks[$n]="$SOYLATTE_32_HOME"
  (( n++ ))

  echo " $n) 1.7.0"
  jdks[$n]="$JAVA_1_7_0_HOME"
  (( n++ ))

  echo " $n) None"
  jdks[$n]=None
  total_jdks=$n

  if (( total_jdks > 1 ))
  then
    while [[ -z "${jdks[$choice]}" ]]
    do
      echo -n "Choose one of the above [1-$total_jdks]: "
      read choice
    done
  else
    choice=1
  fi

  if [[ -z "$current" ]]
  then
    current=$(dirname $(dirname $(type -path java)))
  fi

  if [[ "${jdks[$choice]}" != None ]]
  then
    export JAVA_HOME="${jdks[$choice]}"
  else
    unset JAVA_HOME
  fi

  for jdk in "${jdks[@]}"
  do
    if [[ "$current" == "$jdk" ]]
    then
      explicit_jdk="$jdk"
      break # Found it!!! w00t!
    fi
  done

  if [[ "$explicit_jdk" ]]
  then
    if [[ -z "$JAVA_HOME" ]]
    then
      PATH="$(printf "$PATH" | sed "s|$explicit_jdk/bin:*||g")"
    else
      PATH="$(printf "$PATH" | sed "s|$explicit_jdk|$JAVA_HOME|g")"
    fi

  elif [[ -n "$JAVA_HOME" ]]
  then
    PATH="$JAVA_HOME/bin:$PATH"
  fi

  hash -r
}