update homebrew formulae from sha1 to sha256

fix-sig.sh

#!/bin/sh

if grep -q 'sha256' "$1"
then
  echo "$1 is already up to date, not verifying."
  exit 0
fi

FILE=$1
URL=`grep 'url' "$1" | cut -d' ' -f 4 | sed "s/\'//g" | sed 's/"//g'`
SHA1=`grep 'sha1' "$1" | cut -d' ' -f 4 | sed "s/\'//g" | sed 's/"//g'`
FNAME=`basename $URL`

pushd /tmp >/dev/null
curl -s -O $URL

if [ ! -f $FNAME ]
then
  echo "File not found"; exit 1
  popd > /dev/null
fi

FILESHA1=`shasum -a 1 -b $FNAME | cut -d' ' -f 1`
FILESHA256=`shasum -a 256 -b $FNAME | cut -d' ' -f 1`
rm $FNAME
popd > /dev/null

if [ ! "$SHA1" == "$FILESHA1" ]
then
  echo "original signatures don't match: $FILE"
  echo "  original: $SHA1 $FNAME"
  echo "  new: $FILESHA1 $FNAME"
  echo "changing anyway."
fi

sed -i .bak s/sha1/sha256/ $FILE
sed -i .bak s/$SHA1/$FILESHA256/ $FILE

Run find . -maxdepth 1 -type f -not -name "." -name "*.rb" -print0 | xargs -I{} -0 sh -c './fix-sig.sh $1' -- {}