#!/bin/bash

### Usage

usage()
{
  echo "Usage: `basename $0` [-u userName] [-e UserEmail] [-l userLogin] [-m svnLocation] [-r fromRevision] [-s] [-g gitname=cgal.git] [-v] [-h]" >&2
  echo >&2
  echo "  -r gives revision to start from. Other options than a number: LAST, BASE" >&2
  echo "  -s skip fetch" >&2
  echo "  -v the version" >&2
  echo "  -h this info screen" >&2
  echo  >&2
}

### Config

userName="Eric Berberich"
userEmail=eric@mpi-inf.mpg.de
userLogin=eric
svnGforge=svn+ssh://$userLogin@scm.gforge.inria.fr/svn/cgal
fromSvn=file://$HOME/CGAL/gforge/cgal-m
#fromSvn=$svnGforge
fromRev=63050
gitName=cgal.git
skipFetch=0

# parse command line arguments
while getopts u:e:l:r:m:g:sh OPT; do
  case "$OPT" in
    u)  userName=$OPTARG
        ;;

    e)  userEmail=$OPTARG
        ;;

    l)  userLogin=$OPTARG
        ;;

    m)  fromSvn=$OPTARG
        ;;

    r)  fromRev=$OPTARG
        ;;

    s)  skipFetch=1
        ;;

    r)  gitName=$OPTARG
        ;;

    h)  usage
        exit 0
        ;;

    v)  echo "`basename $0` version 0.1"
        exit 0
        ;;

    \?) # getopts issues an error message
        usage
        exit 1
        ;;
  esac
done

#shift `expr $OPTIND - 1`

### Create repo

echo "Create new directory $gitname"
rm -fr $gitName
mkdir $gitName
cd $gitName
echo

# rewrite root
rewriteRoot=--rewrite-root=$svnGforge
rewriteRoot=

# options to speedup

# TODO internal-releases only >= 3.7
internalReleasesTags="--tags tags/internal-releases"
internalReleasesTags=

debianTags="--tags tags/debian"
debianTags=

CMD="git svn init $fromSvn $rewriteRoot --trunk branches/next --branches branches/features --branches branches/releases --tags tags/releases $internalReleasesTags $debianTags"
echo "Init repository: $CMD"
$CMD
echo

### Modify repo/.git/config 

# rename remotes -> remotes/svn
CMD="sed -e s|remotes|remotes/svn| < .git/config > .git/config.altered"
echo "Rename 'remotes' to 'remotes/svn' in $gitName/.git/config: $CMD"
sed -e 's|remotes|remotes/svn|' -e 's|svn/trunk|svn/next|' < .git/config > .git/config.altered
echo


# add 'stable' branch
#CMD=
echo "Add 'stable' branch to $gitName/.git/config"
echo '        fetch = trunk:refs/remotes/svn/stable' >> .git/config.altered
# TODO git branch --track release git-svn-release-branch?
#$CMD
echo

CMD="mv -f .git/config.altered .git/config"
#echo "Activate new config: $CMD"
$CMD
#echo

# add author
CMD="git config user.name \"$userName\"; git config user.email \"$userEmail\""
echo "Add author to $gitName/.git/config: $CMD"
pwd
#$CMD
git config user.name  "$userName"
git config user.email "$userEmail"
echo

echo "Using config $gitName/.git/config:"
cat .git/config

### Fetch

if [ $skipFetch = 0 ]; then

  ### Authors file
  echo "Get authors file with svn"
  svn cat $fromSvn/branches/next/Maintenance/git/authors-file.txt > /tmp/cgal-authors-file.txt
  echo 

  # fetch from svn server
  echo "Fetch from SVN repository: git svn fetch -r$fromRev:HEAD "
  if [ "$fromRev" = "LAST" ]; then
    # last revision on next
    fromRev=$(svn info $fromSvn/branches/next | grep "Last Changed Rev: " | tr -d 'Last Changed Rev: ')
    echo "Last Revision: $fromRev"
  fi
  git svn fetch --authors-file=/tmp/cgal-authors-file.txt -r$fromRev:HEAD 
  # TODO fetch each branch from its creation-revision only
  echo

  rm -f /tmp/cgal-authors-files.txt

  ### Branch names

  # rename master next
  echo "Rename main branch to local/next"
  git branch -m master local/next

fi


# What about? 
## git config svn-remote.svn.url $svncgal    (or $svncgal/trunk if you are doing trunk only)
### http://translate.org.za/blogs/wynand/en/content/changing-your-svn-repository-address-git-svn-setup
## unhandled.log (which lists all svn properties, such as svn:eol, that has not been converted).