#!/bin/bash

declare -a paths_prepend=(
    "/usr/local/bin"
    "/usr/local/sbin"
    "$HOME/.dotfiles/bin"
    "$HOME/.rbenv/shims"
    "$HOME/.pyenv/shims"
    "$HOME/.rbenv/bin"
    "$HOME/.pyenv/bin"
    "$(brew --prefix coreutils)/libexec/gnubin"
)

declare -a paths_append=(
    # ...
)

# Prepend directories to PATH
for index in ${!dirs_to_prepend[*]}; do
    if [ -d ${dirs_to_prepend[$index]} ]; then
        # If these directories exist, then prepend them to existing PATH
        PATH="${dirs_to_prepend[$index]}:$PATH"
    fi
done

# Append directories to PATH
for index in ${!dirs_to_append[*]}; do
    if [ -d ${dirs_to_append[$index]} ]; then
        # If these bins exist, then append them to existing PATH
        PATH="$PATH:${dirs_to_append[$index]}"
    fi
done

unset paths_prepend paths_append
export PATH