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bitcoin-bips/scripts/diffcheck.sh

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#!/bin/bash
diff README.mediawiki /tmp/table.mediawiki | grep '^[<>] |' >/tmp/after.diff || true
if git checkout HEAD^ && scripts/buildtable.pl >/tmp/table.mediawiki 2>/dev/null; then
diff README.mediawiki /tmp/table.mediawiki | grep '^[<>] |' >/tmp/before.diff || true
newdiff=$(diff -s /tmp/before.diff /tmp/after.diff -u | grep '^+')
if [ -n "$newdiff" ]; then
echo "$newdiff"
exit 1
fi
else
echo 'Cannot build previous commit table for comparison'
fi