#!/bin/bash

# Use the script like this:
# . setphp 7.1
# or
# source setphp 5.6
#
# It will look for the path to the current PHP version in your PATH and switch to
# the new PHP version.
# If you do not have a path to a php version, then it will add one.
# If the version you specify does not exist, it will list the versions that are available.
# I wrote this for a Plesk server with various applications running under different versions
# of PHP, allowing me to quickly swicth between them on the command line.

# https://stackoverflow.com/questions/8063228/how-do-i-check-if-a-variable-exists-in-a-list-in-bash
# list_include_item "10 11 12" "2"
function list_include_item {
  local list="$1"
  local item="$2"
  if [[ $list =~ (^|[[:space:]])"$item"($|[[:space:]]) ]] ; then
    # yes, list include item
    result=0
  else
    result=1
  fi
  return $result
}

wrapper_func() {
  # The location of the PHP versions supplied by Plesk.
  local BASEDIR="/opt/plesk/php/"

  # The requested PHP version.
  local VERSION=$1

  # The available PHP versions.
  local VERSIONS=$(ls $BASEDIR)

  if $(list_include_item "$VERSIONS" "$VERSION") ; then
    echo $PATH
    if [[ $PATH = *"$BASEDIR"* ]]; then
       PATH=$(echo $PATH | sed 's#'$BASEDIR'[0-9.]*[^/]/bin#'$BASEDIR$VERSION'/bin#')
       echo "Updated:"
    else
       echo "Added:"
       PATH="$BASEDIR$VERSION/bin:$PATH"
    fi
    echo $PATH
  else
    echo Usage: $(basename $0) php-version
    echo Versions are: $VERSIONS
  fi
}

wrapper_func $1