convert a SVN revision number to a Git hash

svn2git

commit_hash_pattern="[0-9a-z]{30,40}"
svn_revision_pattern="/.+@([0-9]+)"

git_log="$(git log 2> /dev/null)"

current_git_hash=""

# loop over all given SVN revision numbers
for svnRevisionNumber in "$@" 
do
	for line in $git_log
	do 
		# see if the current line is a git commit hash
		if [[ ${line}} =~ ${commit_hash_pattern} ]]; then
			current_git_hash=$line 
		fi

		# see if the current line is the SVN url with revision number
		if [[ ${line}} =~ ${svn_revision_pattern} ]]; then
			svn_revision=${BASH_REMATCH[1]}
			if [[ "$svn_revision" = "$svnRevisionNumber" ]]; then
				echo "SVN: $svnRevisionNumber Git: $current_git_hash"
				break
			fi
		fi
	done
	
done