#!/bin/sh

# check for SVN revision number

revision=$(cat snapshot_version 2> /dev/null)

test $revision || revision=$(cd "$1" && LC_ALL=C svn info 2> /dev/null | grep Revision | cut -d' ' -f2)

test $revision || revision=$(cd "$1" && grep revision .svn/entries 2>/dev/null | cut -d '"' -f2)

test $revision || revision=$(cd "$1" && sed -n -e '/^dir$/{n

p

q

}' .svn/entries 2>/dev/null)

test $revision && revision=SVN-r$revision

# check for git svn revision number

if ! test $revision; then

    revision=$(cd "$1" && git svn find-rev HEAD)

    test $revision && revision=git-svn-r$revision

fi

# check for git short hash

if ! test $revision; then

    revision=$(cd "$1" && git log -1 --pretty=format:%h)

    test $revision && revision=git-$revision

fi

# no revision number found

test $revision || revision=UNKNOWN

# releases extract the version number from the VERSION file

version=$(cat VERSION 2> /dev/null)

test $version || version=$revision

test -n "$3" && version=$version-$3

NEW_REVISION="#define FFMPEG_VERSION \"$version\""

OLD_REVISION=$(cat version.h 2> /dev/null)

# Update version.h only on revision changes to avoid spurious rebuilds

if test "$NEW_REVISION" != "$OLD_REVISION"; then

    echo "$NEW_REVISION" > "$2"

fi