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#!/usr/bin/env bash
export LANG=C
export LC_ALL=C
[ -n "$TOPDIR" ] && cd $TOPDIR
try_version() {
[ -f version ] || return 1
REV="$(cat version)"
[ -n "$REV" ]
}
try_svn() {
[ -d .svn ] || return 1
REV="$(svn info | awk '/^Last Changed Rev:/ { print $4 }')"
REV="${REV:+r$REV}"
[ -n "$REV" ]
}
try_git() {
[ -d .git ] || return 1
REV="$(git log | grep -m 1 git-svn-id | awk '{ gsub(/.*@/, "", $0); print $1 }')"
REV="${REV:+r$REV}"
[ -n "$REV" ]
}
try_hg() {
[ -d .hg ] || return 1
REV="$(hg log -r-1 --template '{desc}' | awk '{print $2}' | sed 's/\].*//')"
REV="${REV:+$REV}"
[ -n "$REV" ]
}
try_version || try_svn || try_git || try_hg || REV="unknown"
echo "$REV"