Report branches or commits that are not yet merged into master.

git-unmerged.py

#!/usr/bin/python
"""
Report branches or commits that are not yet merged into master.
"""
import subprocess
from os.path import basename

# Merge/environment branches. These will be excluded from the
# "unmerged branches" list.
EXCLUDE_BRANCHES = ['staging', 'uat', 'production', 'master']


def run(args):
    """
    Run command and capture output into list of lines.
    """
    # Run command and split output
    lines = subprocess.check_output(args).strip().split('\n')
    # Strip spaces from each line
    lines = [line.strip() for line in lines if line.strip()]
    return lines


unmerged_branches = []
unmerged_singular_commits = []

# Get list of unmerged commits
unmerged_refs = run(['git', 'log', 'production', '^master', '--no-merges',
                     '--format=%h'])

print 'You have %r unmerged commits.' % len(unmerged_refs)

for ref in unmerged_refs:

    # Get list of branches that contain this commit
    branch_refs = run(['git', 'branch', '-a', '--contains', ref])

    for branch in set(branch_refs):

        # If this branch name is in the list of excludes, remove it
        if basename(branch) in EXCLUDE_BRANCHES:
            branch_refs.remove(branch)

    # If this commit is in a non-deploy branch somewhere, add that branch to
    # the list, otherwise this is a singular commit with no branch
    if branch_refs:
        for branch in branch_refs:
            unmerged_branches.append(basename(branch))
    else:
        unmerged_singular_commits.append(ref)


# Show unmerged branches
if unmerged_branches:
    print '\nUnmerged branches:'
    for branch in set(unmerged_branches):
        print '* %s' % basename(branch)

# Show unmerged singular commits
if unmerged_singular_commits:
    print '\nUnmerged singular commits (with no branch):'
    for commit in set(unmerged_singular_commits):
        print(run(['git', 'log', '-1', '--format=* %h  %an -- %s', commit])[0])

Install this by running:

sudo wget -O /usr/local/bin/git-unmerged https://gist.github.com/dansimau/7232737/raw/git-unmerged.py
sudo chmod +x /usr/local/bin/git-unmerged

Then from within a git repo simply run:

git unmerged

Et voila!