version

#!/bin/sh

# borrowed from ffmpeg

# check for git short hash
if ! test "$revision"; then
    if (cd "$1" && grep git RELEASE 2> /dev/null >/dev/null) ; then
        revision=$(cd "$1" && git describe --tags --match N 2> /dev/null)
    else
        revision=$(cd "$1" && git describe --tags --always 2> /dev/null)
    fi
fi

# Shallow Git clones (--depth) do not have the N tag:
# use 'git-YYYY-MM-DD-hhhhhhh'.
test "$revision" || revision=$(cd "$1" &&
  git log -1 --pretty=format:"git-%cd-%h" --date=short 2> /dev/null)

# Snapshots from gitweb are in a directory called libdrift-hhhhhhh or
# libdrift-HEAD-hhhhhhh.
if [ -z "$revision" ]; then
  srcdir=$(cd "$1" && pwd)
  case "$srcdir" in
    */libdrift-[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f])
      git_hash="${srcdir##*-}";;
    */libdrift-HEAD-[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f])
      git_hash="${srcdir##*-}";;
  esac
fi

# no revision number found
test "$revision" || revision=$(cd "$1" && cat RELEASE 2> /dev/null)

# Append the Git hash if we have one
test "$revision" && test "$git_hash" && revision="$revision-$git_hash"

echo $revision