heroku-buildpack-hello/bin/compile

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#!/bin/bash
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indent() {
sed -u 's/^/ /'
}
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echo "-----> [bash] Found a hello.txt"
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# if hello.txt is empty, abort the build
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if [ ! -s $1/hello.txt ]; then
echo "hello.txt was empty" | indent
exit 1
fi
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# replace hello with goodbye in a new file
cat $1/hello.txt | sed -e "s/[Hh]ello/Goodbye/g" > $1/goodbye.txt