gitmove

#!/bin/bash

# Back up your repository before using this.

# Usage: cd DIR && gitmove ESCNEWDIR
# That incantation rewrites every path DIR/F to DIR/NEWDIR/F by rewriting every commit.
# ESCNEWDIR is escaped NEWDIR, explained below.

# Note about escaping: Hyphens in ESCNEWDIR must be preceded by a backslash.
# For example, if NEWDIR is foo-bar, then the incantation must be:
#     cd DIR && gitmove 'foo\-bar'
# The single quote makes the shell not interpret the string passed to sed.

# This fragment is copied from man git-filter-branch, and then modified to avoid choking on empty commits.

git filter-branch -f --index-filter '
  git ls-files -s |
  sed "s-\t\"*-&'"$1"'/-" |
  GIT_INDEX_FILE=$GIT_INDEX_FILE.new git update-index --index-info &&
      { mv $GIT_INDEX_FILE.new $GIT_INDEX_FILE; true; }
' master