Switch Erlang/Elixir scripts

switcherl

#!/bin/bash

ERL_HOME=/opt/erl
if [[ "${ERL_HOME}" != */ ]]; then
  ERL_HOME=${ERL_HOME}/
fi
LINK_DIRS="bin lib man"

find_active() {
  HOME_DEPTH=`echo ${ERL_HOME} | grep -o / | wc -l`
  TOKEN_DEPTH=`expr $HOME_DEPTH + 1`
  if [ -d ${ERL_HOME}/bin ]; then
    ACTIVE=`readlink ${ERL_HOME}/bin | cut -d/ -f${TOKEN_DEPTH}`
    echo $ACTIVE
  fi
}

activate_erlang() {
  if [ ! -d "${ERL_HOME}$1" ]; then
    printf "Erlang version %s not found\n" $1
    exit 1
  fi

  for dir in $LINK_DIRS
  do
    rm -f ${ERL_HOME}$dir
  done

  for dir in $LINK_DIRS
  do
    ln -s ${ERL_HOME}$1/$dir ${ERL_HOME}
  done
  hash -r
  echo "$1 is active"
  hash -r
}

list_available() {
  ACTIVE=`find_active`
  AVAIL=`ls ${ERL_HOME} | grep -er[0-9]`
  echo "Available Erlang versions:"
  for vsn in $AVAIL
  do
    if [ "$vsn" == "$ACTIVE" ]; then
      printf "  *%s*\n" $vsn
    else
      printf "  %s\n" $vsn
    fi
  done
}

if [ "$1" == "" ]; then
  printf "Specify which Erlang version or 'list' to view available versions\n" 1>&2
  exit 1
fi

case $1 in
  list)
    list_available
    ;;
  *)
    activate_erlang $1
    ;;
esac

switchex

#!/bin/bash

EX_HOME=/opt/elixir
if [[ "${EX_HOME}" != */ ]]; then
  EX_HOME=${EX_HOME}/
fi
LINK_DIRS="bin lib share"


find_active() {
  HOME_DEPTH=`echo ${EX_HOME} | grep -o / | wc -l`
  TOKEN_DEPTH=`expr $HOME_DEPTH + 1`
  if [ -d ${EX_HOME}/bin ]; then
    ACTIVE=`readlink ${EX_HOME}/bin | cut -d/ -f${TOKEN_DEPTH}`
    echo $ACTIVE
  fi
}

activate_elixir() {
  if [ ! -d "${EX_HOME}$1" ]; then
    printf "Elixir version %s not found\n" $1
    exit 1
  fi

  for dir in $LINK_DIRS
  do
    rm -f ${EX_HOME}$dir
    if [ -d ${EX_HOME}$1/$dir ]; then
      ln -s ${EX_HOME}$1/$dir ${EX_HOME}
    fi
  done
  hash -r
  echo "$1 is active"

}

list_available() {
  ACTIVE=`find_active`
  AVAIL=`ls ${EX_HOME} | grep -e "[0-9].[0-9].[0-9]"`
  echo "Available Elixir versions:"
  for vsn in $AVAIL
  do
    if [ "$vsn" == "$ACTIVE" ]; then
      printf "  *%s*\n" $vsn
    else
      printf "  %s\n" $vsn
    fi
  done
}

if [ "$1" == "" ]; then
  printf "Specify which Elixir version or 'list' to view available versions\n" 1>&2
  exit 1
fi

case $1 in
  list)
    list_available
    ;;
  *)
    activate_elixir $1
    ;;
esac