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#!/usr/bin/env bash
#
# Usage: get-scala-revision [dir]
# Figures out current scala revision of a git clone.
#
# If no dir is given, current working dir is used.
# not like releases come out so often that we are duty-bound
# to recalculate this every time.
# git merge-base v2.8.2 v2.9.1 master
devbase="df13e31bbb"
# reimplementing git describe hopefully in a way which works
# without any particular tags, branches, or recent versions of git.
# this is supposed to generate
# dev-NNNN-g<sha>
# where NNNN is the number of commits since devbase, which
# is the merge-base of the most recent release and master.
# Presently hardcoded to reduce uncertainty, v2.8.2/v2.9.1/master.
commits=$(git --no-pager log --pretty=oneline $devbase..HEAD | wc -l)
sha=$(git rev-list -n 1 HEAD)
datestr=$(date "+%Y-%m-%d")
printf "rdev-%s-%s-g%s\n" $commits $datestr ${sha:0:7}
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