pm-dependencies

#! /usr/bin/env bash

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
if [[ -L "${BASH_SOURCE[0]}" ]]; then
    SCRIPT_DIR="$(readlink "${BASH_SOURCE[0]}")"
    SCRIPT_DIR="$( cd "$( dirname "${SCRIPT_DIR}" )" >/dev/null 2>&1 && pwd )"
fi

# get current package manager, populates 'package_manager'
source ${SCRIPT_DIR}/lib/package-manager.sh

if [[ "$#" -eq 0 || "$1" == "--help" ]]; then
  echo "Usage: pm-dependencies [package]"
  echo "List all dependencies of a package."
  exit 0
fi

bold='\033[1m'
cyan='\033[0;36m'
reset='\033[0m'

if [[ ${package_manager} == 'pacman' ]]; then
  echo "${bold}Dependencies:${reset}"
  output=$(pactree "$@")
  # if output is only a line long (name of package), then it has no dependencies
  if [[ $(echo "$output" | wc -l) -eq 1 ]]; then
    echo "${cyan}N/A${reset}"
  else
    echo "$output"
  fi
  echo "${bold}Reverse dependencies:${reset}"
  output=$(pactree --reverse "$@")
  if [[ $(echo "$output" | wc -l) -eq 1 ]]; then
    echo "${cyan}N/A${reset}"
  else
    echo "$output"
  fi
elif [[ ${package_manager} == 'brew' ]]; then
  brew deps "$@"
fi