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#!/usr/bin/env bash
# Make sure file has a trailing newline
f="$1"
if [ -z "$f" ]; then
echo "usage: $0 <file>"
exit 1
fi
if [ ! -f "$f" ]; then
exit 0
fi
if [[ $(tail -c1 "$f") ]]; then
echo "$f: No newline at end of file"
echo '' >> "$f"
exit 1
fi
if [[ ! $(tail -c2 "$f") ]]; then
echo "$f: Extra trailing newline"
exit 1
fi
if grep -q $'\r' "$f"; then
echo "$f: DOS-style newlines"
dos2unix "$f" &> /dev/null
exit 1
fi
if grep -q $'[\t ]$' "$f"; then
echo "$f: Trailing whitespace"
sed -i $'s/[ \t]*$//' "$f"
exit 1
fi
exit 0
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