isMerged

#! /usr/bin/env bash

# check branches created from and merged to this branch
REMOTE=upstream
COMPAREBRANCH=develop
MASTER=refs/remotes/$REMOTE/$COMPAREBRANCH
git fetch $REMOTE
# for each remote branch...
for BRANCH in $(git for-each-ref --format='%(refname)' refs/heads/); do
    # ...except the $MASTER branch and the current HEAD
    [[ $BRANCH == $MASTER || $BRANCH =~ /HEAD$ ]] && continue

    # get the hash for the head of the branch
    BRANCH_HEAD=$(git show-ref --head --hash $BRANCH)

    # returns the first shared commit among $MASTER and $BRANCH commits
    BRANCH_POINT=$(fgrep -m 1 -f <(git rev-list --first-parent $BRANCH) \
                                 <(git rev-list --first-parent $MASTER))

    # find the best merge point
    BRANCH_MERGE=$(git merge-base $MASTER $BRANCH)

    # determine the type of branch
    if [[ $BRANCH_POINT == $BRANCH_HEAD ]]; then
        echo -e "$BRANCH: \t\t\tnew branch with 0 commits"
    elif [[ $BRANCH_MERGE == $BRANCH_HEAD ]]; then
        echo -e "$BRANCH: \t\tfully merged into $REMOTE/$COMPAREBRANCH"
    else
        echo -e "$BRANCH: \t\tbranch with changes"
    fi
done