#!/usr/bin/env bash
#
# Add a directory to the front of the PATH if it exists and is not already there
# Usage: x-path-prepend <dir>

# Set verbosity with VERBOSE=1
VERBOSE="${VERBOSE:-0}"

# Function to print messages if VERBOSE is enabled
# $1 - message (string)
msg()
{
  [[ "$VERBOSE" -eq 1 ]] && echo "$1"
}

if [ "$#" -ne 1 ]; then
  echo "Usage: $0 <dir>"
  exit 1
fi

dir="$1"

if [ ! -d "$dir" ]; then
  msg "(?) Directory $dir does not exist"
  exit 0
fi

if echo "$PATH" | grep -qE "(^|:)$dir($|:)"; then
  msg "(!) Directory $dir is already in PATH"
else
  export PATH="$dir${PATH:+":$PATH"}"
  msg "(!) Directory $dir has been added to the front of PATH"
fi