#!/bin/sh

function usage() {
  echo "Usage: $0 <source-icon> <output-directory>"
}

IN_FILE="$1"
OUT_DIR="$2"

if [[ ! -r "$IN_FILE" ]]; then
  echo "Source icon not found: $IN_FILE"
  usage
  exit 1
fi
if [[ ! -d "$OUT_DIR" ]]; then
  echo "Output directory not found: $OUT_DIR"
  usage
  exit 2
fi

for SIZE in 29 40 60 76; do
  echo "* Generating app icons at $SIZE points"
  retina-scale $SIZE "$IN_FILE" "$OUT_DIR"
done