#!/bin/bash

if [ $# -eq 0 ]; then
          echo "Usage: $0 SVNURL" 1>&2
          exit 1
fi

if ! command -v svn2git >/dev/null 2>&1 ; then
    echo "Cannot find svn2git.  Please install the svn2git Ruby gem"
    exit 1
fi

git svn --version > /dev/null 2>&1
if [ $? -ne 0 ]; then
    echo "git-svn not found.  Please install git-svn to continue."
    exit 1
fi

SVN_URL="$1"
REPO_NAME=`basename $1`
GIT_EDITOR=`git config --get --global core.editor`

echo "Retrieving authors from $SVN_URL..."
svn log -q ${SVN_URL} | awk -F '|' '/^r/ {sub("^ ", "", $2); sub(" $", "", $2); print $2" = "$2" <"$2">"}' | sort -u > authors-transform.txt
printf "\n\nIn order to properly map svn committers to git, you will have to manually edit the list.\n"
printf "For example, youre  going to replace lines like: \n\twildcatw = wildcatw <wildcatw> \nwith: \n\twildcatw = Wilbur Wildcat <wilbur@arizona.edu>\n\n"
read -p "Press [Enter] key to start $GIT_EDITOR to edit the list and make sure to SAVE THE FILE BEFORE EXITING..."
$GIT_EDITOR authors-transform.txt

mkdir ${REPO_NAME}
cd ${REPO_NAME}
svn2git ${SVN_URL} --authors=../authors-transform.txt

if [ $? -eq 0 ]; then
    echo "Cleaning up..."
    rm ../authors-transform.txt
    echo "Created git repo in $REPO_NAME"
    exit 0
else
    echo "Conversion failed.  Leaving authors-transform.txt in place"
    exit 1
fi