stale.sh

#!/bin/bash

branchlist() {
    git for-each-ref -s --format '%(refname:short)' refs/heads/
}

filter_stale() {
    while read branch; do
        (git rev-parse --verify --quiet "$branch"@{u} > /dev/null 2>&1 && git merge-base --is-ancestor "$branch"@{u} "$branch") || echo "$branch"
    done
}

filter_unmerged() {
    xargs git merge-base --independent ${1:-} | xargs git name-rev --name-only
}

filter_by_type() {
    fgrep "$1"
}

TYPE="${1-feature}"

BRANCHES=$(branchlist | filter_by_type $TYPE | filter_unmerged | filter_stale)
if [ "$BRANCHES" == "" ]; then
    echo No stale branches
    exit 0
fi

CURRENT=$(git rev-parse --abbrev-ref HEAD)

echo Rebasing stale branches...
for BRANCH in $BRANCHES; do
    echo -n Rebasing branch ""$BRANCH""..." "
    git checkout "$BRANCH" > /dev/null 2>&1 && git pull --rebase --no-tags > /dev/null 2>&1
    if [[ $? != 0 ]]; then
        echo 'KO!'
        exit 1
    else
        echo 'OK'
    fi
done

git checkout $CURRENT > /dev/null 2>&1