#!/bin/bash

function runcommand {
    "$@"
    local status=$?
    if [ $status -ne 0 ]; then
        echo "error with $1" >&2
    fi
    return $status
}

PROGRAMNAME=$(basename $0)
if [ $# -ne 2 ] ; 
    then echo "Usage $PROGRAMNAME <gitusername> <svndirname>"
	echo "$PROGRAMNAME creates a <svndirname>_svnbackup Dir"
	echo "and a <svndirname>_unversioned Dir"
	echo "then it clones your Github repository by 'clone https://github.com/<gitusername>/<svndirname>.git'"
	echo "and finally copies all unversioned files from the old svn data into the new git directory"
	exit
fi
if [ -d $2_svnbackup ] ; 
    then echo "$2_svnbackup does already exist !"
	echo "Did the program maybe run before? Please check before try $PROGRAMNAME again"
	exit
fi
if [ -d $2_unversioned ] ; 
    then echo "$2_unversioned does already exist."
	echo "For security, this need to be removed manually before try $PROGRAMNAME again"
	exit
fi
echo "Create directory copies:"
runcommand cp -r $2 $2_unversioned
runcommand mv $2 $2_svnbackup
echo "Clone repostitory:"
runcommand git clone https://github.com/$1/$2.git
echo "remove svn artifacts:"
runcommand cd $2_unversioned
runcommand svn list -R | xargs rm
find . -name ".svn" -exec  rm -rf {}  \; 2>/dev/null
runcommand cd ..
echo "copy remaining unversioned files into new git repository:"
runcommand cp -r $2_unversioned/* $2
echo "Check results between old svn directory and new git repository:"
diff -r -q $2_svnbackup $2