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#! /bin/bash
set -eu
set-serial-number()
{
sed >"$1.tmp" -e '/^$/q' "$1"
echo >>"$1.tmp" "#serial $2"
echo >>"$1.tmp" ""
sed >>"$1.tmp" -e '1,/^$/d' -e '/^#serial .*/,+1d' "$1"
mv "$1.tmp" "$1"
}
for n in "$@"; do
echo "$n ... "
# Determine the number of revisions that have occurred to the macro.
revision=$(git log --oneline -- "$n" | wc -l)
# Update the serial number in the m4 file.
set-serial-number "$n" "$revision"
# Check whether git regards the file as "modified" now. If it does,
# the serial nmuber needs to be bumped one more time.
if ! git diff --quiet --exit-code -- "$n"; then
set-serial-number "$n" "$((revision + 1))"
fi
done
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