Extracting sparse array files...

extract_sparse.sh

# http://stackoverflow.com/questions/5998987/splitting-a-set-of-files-within-a-git-repo-into-their-own-repository-preserving
# Takes some while to run 1000s
git filter-branch \
    --prune-empty \
    --index-filter '
        git ls-tree -z -r --name-only --full-tree $GIT_COMMIT \
        | grep -z -v "^base/sparse" \
        | grep -z -v "^test/sparse.jl" \
        | grep -z -v "^doc/manual/linear-algebra.rst" \
        | grep -z -v "^doc/manual/arrays.rst" \
        | xargs -0 -r git rm --cached -r
    ' \
    -- \
    master

Cleanup afterwards:

git filter-branch --prune-empty --parent-filter 'sed "s/-p //g" | xargs -r git show-branch --independent | sed "s/\</-p /g"'
git reset --hard
git gc --aggressive
git prune
git remote rm origin