#!/bin/sh
  # Print additional version information for non-release trees.

  usage() {
  	echo "Usage: $0 [srctree]" >&2
  	exit 1

  }

  cd "${1:-.}" || usage

  # Check for git and a git repo.

  if head=`git rev-parse --verify --short HEAD 2>/dev/null`; then

  	# Do we have an untagged version?

  	if git name-rev --tags HEAD | grep -E '^HEAD[[:space:]]+(.*~[0-9]*|undefined)$' > /dev/null; then

  		if tag=`git describe 2>/dev/null`; then
  			echo $tag | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'

  		else
  			printf '%s%s' -g $head

  		fi

  	fi

  	# Is this git on svn?
  	if git config --get svn-remote.svn.url >/dev/null; then
  	        printf -- '-svn%s' "`git-svn find-rev $head`"
  	fi

  	# Are there uncommitted changes?

  	git update-index --refresh --unmerged > /dev/null

  	if git diff-index --name-only HEAD | grep -v "^scripts/package" \
  	    | read dummy; then

  		printf '%s' -dirty

  	fi

  
  	# All done with git
  	exit
  fi
  
  # Check for mercurial and a mercurial repo.
  if hgid=`hg id 2>/dev/null`; then
  	tag=`printf '%s' "$hgid" | cut -d' ' -f2`
  
  	# Do we have an untagged version?
  	if [ -z "$tag" -o "$tag" = tip ]; then
  		id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`
  		printf '%s%s' -hg "$id"
  	fi
  
  	# Are there uncommitted changes?
  	# These are represented by + after the changeset id.
  	case "$hgid" in
  		*+|*+\ *) printf '%s' -dirty ;;
  	esac
  
  	# All done with mercurial
  	exit

  fi

  
  # Check for svn and a svn repo.

  if rev=`svn info 2>/dev/null | grep '^Last Changed Rev'`; then

  	rev=`echo $rev | awk '{print $NF}'`
  	changes=`svn status 2>/dev/null | grep '^[AMD]' | wc -l`
  
  	# Are there uncommitted changes?
  	if [ $changes != 0 ]; then

  		printf -- '-svn%s%s' "$rev" -dirty

  	else
  		printf -- '-svn%s' "$rev"
  	fi
  
  	# All done with svn
  	exit
  fi