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#!/usr/bin/env bash
if [ $# -ne 2 ]; then
cat << EOS
Use: version_cmp x.y.z m.n.o
or version_cmp-metadata x.y.z m.n.o+metadata
Exit status:
0: v1 = v2
1: v1 < v2
2: v1 > v2
EOS
exit 127
fi
# First argument processing
s1=${1#*[-+]}
f=${1%[-+]*}
c=${f//[^.]/}
f=${f//./}
let "v1 = f * 10 ** ( 2 - ${#c} )"
# Second argument processing
s2=${2#*[-+]}
f=${2%[-+]*}
c=${f//[^.]/}
f=${f//./}
let "v2 = f * 10 ** ( 2 - ${#c} )"
if [ "$v1" -lt "$v2" ]; then
exit 1
elif [ "$v1" -gt "$v2" ]; then
exit 2
else
if [ "$s1" \< "$s2" ]; then
exit 1
elif [ "$s1" \> "$s2" ]; then
exit 2
else
exit 0
fi
fi
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