File: patch-to-news

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#!/bin/bash

set -eo pipefail

patch="$1"

sed '
  # delete everything after the first line starting with "--- " (the diff)
  /^--- [^ ]/,$d' < "$patch" \
| tac \
| sed '
  # delete everything up to the first line containing only "---" (the diffstat)
  1,/^---$/d' \
| tac \
| sed '
  # delete everything before the first blank line (git summary line)
  1,/^$/d' \
| sed '
  # convert to our README.Debian NEWS format
  1 s/^/* /
  2,$ s/^/  /'

echo "  Patch: $(basename $patch)"