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#!/bin/sh
# $1 - os name {linux|darwin|win}
# $2 - [optional] raw version string "vX.Y-patchN-sha1". as from `git describe'
# (see below)
set -eu
#set -x
croak() {
echo "$0: $*" >&2
exit 1
}
[ $# -ge 1 ] || croak "missing OS argument"
os=$1
if [ $# -eq 2 ] && [ "$2" ]; then
v0=$2
else
cmd="git describe --tags --abbrev=12"
v0=$($cmd) || croak "odd; command '$cmd' failed"
fi
# strip off the 'v' prefix, if any
v0=${v0#v}
case $os in
linux)
v=$v0
;;
darwin|win)
# just the dots in the version string - this way we can
# count them
IFS=.
set -- $v0 # split $v0 using $IFS separator
dots=$(($# - 1)) # use positional argument count
# split version string using a '-' separator
IFS='-'
set -- $v0
v=$1
# do we need to add another digit?
# We know there are 1 or 2 dots in $v, so if it's just one
# or we are trying to get to 4, add one digit
if [ $dots -eq 1 ] || [ $os = win ]; then
if [ $# -gt 1 ]; then
v=$v.$2
else
v=$v.0
fi
fi
# and if it was just one dot and we want 4, at another 0
if [ $dots -eq 1 ] && [ $os = win ]; then
v=$v.0
fi
;;
*)
v='git.missing.please.hardcode.version'
;;
esac
printf '%s' $v
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