Synchronizes current branch with remote's master

git_sync.sh

#!/bin/bash
##
# Synchronizes current branch with remote's master.
#
#   `./git_sync.sh`      – updates current branch with changes from remote/master
#   `./git_sync.sh push` – updates remote/master with changes from current branch
##

count_stashes () {
  # `wc` generates a value with whitespace
  # `bc` converts it to a number
  git stash list | wc -l | bc
}

(echo ''; set -x; git status)

original_stashes_count=$(count_stashes)

(echo ''; set -x; git stash)

stashes_count_after_stash=$(count_stashes)

original_branch=$(git branch --show-current)

(echo ''; set -x; git checkout master)

(echo ''; set -x; git pull -r)

(echo ''; set -x; git checkout "${original_branch}")

(echo ''; set -x; git rebase master)

if [ "push" == "${1}" ]; then
  (echo ''; set -x; git checkout master)

  (echo ''; set -x; git merge "${original_branch}")

  (echo ''; set -x; git push origin master)

  (echo ''; set -x; git checkout "${original_branch}")

  (echo ''; set -x; git rebase master)
fi

if [ "$original_stashes_count" != "$stashes_count_after_stash" ]; then
  (echo ''; set -x; git stash pop)
else
  (echo ''; set -x; git status)
fi