#!/bin/sh

# Update patch set for GNU Bash or Readline.

if [ $# -ne 2 ]
then
    echo "Usage: $(basename $0) PROJECT VERSION"
    echo ""
    echo "Update the patch set for PROJECT (one of \`bash' or \`readline') for"
    echo "the given version (e.g., \`4.0').  Produce \`PROJECT-patches.nix'."
    exit 1
fi

PROJECT="$1"
VERSION="$2"
VERSION_CONDENSED="$(echo $VERSION | sed -es/\\.//g)"

GPG="$(if $(type -P gpg2 > /dev/null); then echo gpg2; else echo gpg; fi)"
PATCH_LIST="$PROJECT-$VERSION-patches.nix"

set -e

start=1
end=100 # must be > 99 for correct padding

rm -vf "$PATCH_LIST"

( echo "# Automatically generated by \`$(basename $0)'; do not edit." ;	\
  echo "" ;								\
  echo "patch: [" )							\
>> "$PATCH_LIST"

for i in `seq -w $start $end`
do
    wget ftp.gnu.org/gnu/$PROJECT/$PROJECT-$VERSION-patches/$PROJECT$VERSION_CONDENSED-$i || break
    wget ftp.gnu.org/gnu/$PROJECT/$PROJECT-$VERSION-patches/$PROJECT$VERSION_CONDENSED-$i.sig
    "$GPG" --verify $PROJECT$VERSION_CONDENSED-$i.sig
    echo "(patch \"$i\" \"$(nix-hash --flat --type sha256 --base32 $PROJECT$VERSION_CONDENSED-$i)\")"	\
    >> "$PATCH_LIST"

    rm -f $PROJECT$VERSION_CONDENSED-$i{,.sig}
done

echo "]" >> "$PATCH_LIST"

echo "Got $(expr $i - 1) patches."
echo "Patch list has been written to \`$PATCH_LIST'."