#! /bin/sh

if [ -z "$1" ]; then
   echo "Usage: $0 svn_url [dir]" >&2
   exit 1
fi

url="$1"

if [ ! -f authors.txt ]; then
   echo "Run \"get-authors $1\" first" >&2
   exit 2
fi

if [ -z "$2" ]; then
   dir="`basename $url`"
else
   dir="$2"
fi

if [ -z "$dir" ]; then
   echo "Usage: $0 $url dir" >&2
   exit 1
fi

# init + fetch
git svn clone "$url" --authors-file=authors.txt --prefix=svn/ --stdlayout "$dir" &&
cd "$dir" &&

# Convert branches and tags

# See https://jessitron.com/2013/08/17/converting-from-svn-to-git/

git for-each-ref --format="%(refname:short)" refs/remotes/svn |
   sed 's#svn/##' | grep -v '^tags' |
      while read aBranch; do git branch $aBranch svn/$aBranch || exit 1; done

# See http://thomasrast.ch/git/git-svn-conversion.html

git for-each-ref --format="%(refname:short)" refs/remotes/svn/tags/ |
while read tag; do
    GIT_COMMITTER_DATE="`git log -1 --pretty=format:\"%ad\" \"$tag\"`" \
    GIT_COMMITTER_EMAIL="`git log -1 --pretty=format:\"%ce\" \"$tag\"`" \
    GIT_COMMITTER_NAME="`git log -1 --pretty=format:\"%cn\" \"$tag\"`" \
    git tag -a -m "`git for-each-ref --format=\"%(contents)\" \"$tag\"`" \
        "`echo \"$tag\" | sed 's#svn/tags/##'`" "$tag" || exit 1
done

# convert svn:ignore to .gitignore
git svn create-ignore &&
git commit -m "Add .gitignore"

# preserve authors.txt
cp -p ../authors.txt .git/info &&
git config --local --path svn.authorsfile .git/info/authors.txt

git svn gc &&
git gc --aggressive &&
echo "Cloned from $url using git-svn" >.git/description &&
exec `git var GIT_EDITOR` .git/description