a commit filter for a git-svn'd repository (maps author and removes git-svn id but revision number)

rewrite-author.sh

git filter-branch --commit-filter '
  case "$GIT_AUTHOR_NAME" in
  *suzuki*) 
    GIT_AUTHOR_NAME="suzu"
    GIT_AUTHOR_EMAIL="[email protected]"
    ;;
  *)
    GIT_AUTHOR_NAME="someone"
    GIT_AUTHOR_EMAIL="[email protected]"
    ;;
  esac
  GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME
  GIT_COMMITTER_EMAIL=$GIT_AUTHOR_EMAIL
  git commit-tree "$@"
' --msg-filter '
    ruby -e \'
      head = STDIN.gets.strip
      rest = STDIN.read
      rev = (head+rest)[/@\d+/][1..-1]
      msg = head if head !~ /git-svn/
      print "r#{rev}#{': ' if !msg.empty?}#{msg}"
    \'    
'