Finds branches that can be safely merged

update_branches.ipy

#!ipython
# to use this run these two steps
# curl https://gist.githubusercontent.com/tianhuil/a6675835a7a0c157fbcb296a743f52d4/raw/704a20201dd4362928f6e39ab0ab0bc0784b2af9/update_branches.ipy
# ipython merged_branches.ipy

!git checkout master
branches = !git branch
other_branches = [b.lstrip() for b in branches if b != '* master']

results = {}

for branch in other_branches:
  !git checkout {branch}
  r = !git rebase master
  r_str = ''.join(r)
  if 'CONFLICT' in r_str:
    !git rebase --abort
  else:
    d = !git diff {branch} master
    if len(d) == 0:
      !echo "Can delete {branch}"