#!/bin/sh -l

slug_ref() {
  echo "$1" |
    tr "[:upper:]" "[:lower:]" |
    sed -r 's#refs/[^\/]*/##;s/[~\^]+//g;s/[^a-zA-Z0-9]+/-/g;s/^-+\|-+$//g;s/^-*//;s/-*$//' |
    cut -c1-63
}

short_sha() {
  echo "$1" |
    cut -c1-8
}

echo ::set-env name=GITHUB_REF_SLUG::"$(slug_ref "$GITHUB_REF")"
echo ::set-env name=GITHUB_HEAD_REF_SLUG::"$(slug_ref "$GITHUB_HEAD_REF")"
echo ::set-env name=GITHUB_BASE_REF_SLUG::"$(slug_ref "$GITHUB_BASE_REF")"
echo ::set-env name=GITHUB_SHA_SHORT::"$(short_sha "$GITHUB_SHA")"