functions

#!/bin/bash

script_path() {
    pushd . > /dev/null
    local script_path="$1";
    while([ -h "${script_path}" ]) do 
        cd "`dirname "${script_path}"`"
        script_path="$(readlink "`basename "${script_path}"`")"; 
    done
    cd "`dirname "${script_path}"`" > /dev/null
    script_path="`pwd`";
    popd  > /dev/null
    echo $script_path
}


source_directories() {
    local _directories=${@:1}

    for _directory in $_directories; do
        if [ -d $_directory ]; then
            for file in $_directory/*; do
                if [ -x $file ] && $(file $file | grep -q 'shell script'); then
                    source $file
                fi
            done
        fi
    done
}

register_alias() {
  local _alias=$1
  local _command=$2
  alias "$_alias=$_command"
  REGISTERED_ALIASES+=( $_alias )
}

unregister_alias() {
  local _alias=$1
  if [[ " ${REGISTERED_ALIASES[@]} " =~ " ${_alias} " ]]; then
    unalias $_alias
    REGISTERED_ALIASES=( ${REGISTERED_ALIASES[@]/$_alias} )
  fi
}

unregister_aliases() {
  for registered_alias in ${REGISTERED_ALIASES[@]}; do
    unalias $registered_alias
  done
  unset REGISTERED_ALIASES
}