git-merged-cleanup

#!/bin/bash

if [[ "$1" == "--help" ]]; then
    echo "Find branches which were already merged in."
    echo ""
    echo "$0 [change_with_merges]"
    echo ""
    echo "Those recognized as merged even by git branch --merged"
    echo " will be deleted (-d)."
    echo "Those detected as merged based on Change-Id will be listed"
    echo " and command to remove them (with -D) will be printed out"
    echo " for you to just copy-paste+run."
    echo ""
    echo "You can put name of branches you want to ALWAYS keep"
    echo "in the ~/.git-merged-cleanup.conf (content like KEEP_BRANCHES='my extra branches')"
    exit 0
fi

if ! git log -1 &>/dev/null; then
    echo "You are not in the git repository!"
fi

grep_changeid() {
    sed -nr 's/ *Change-Id: ([A-Za-z0-9])/\1/p'
}
strip_brmark() {
    sed -r 's/[* ] //'
}
contains() {
    local e
    for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done;
    return 1;
}

THEBRANCH="${1:-master}"
KEEP_BRANCHES=""
if [[ -f ~/.git-merged-cleanup.conf ]]; then
    source "$HOME/.git-merged-cleanup.conf"
fi

echo "Using branch $THEBRANCH as the one with merged changes..."
if [[ ! -z "$KEEP_BRANCHES" ]]; then
    echo -n "Should keep the branches: "
    echo $KEEP_BRANCHES
fi

MERGED="$(git branch --merged ${THEBRANCH} | strip_brmark | grep -vE "^${THEBRANCH}$")"
MERGED_CHANGES="$(git log "$THEBRANCH" | grep_changeid)"

if [[ ! -z "$MERGED" ]]; then
    for BRANCH in $MERGED; do
        if contains "$BRANCH" $KEEP_BRANCHES; then
            echo "Keeping branch $BRANCH"
        else
            git branch -d "$BRANCH"
        fi
    done
fi

BRANCHES="$(git branch | strip_brmark | grep -vE "^${THEBRANCH}$")"

MERGED=""
for BRANCH in $BRANCHES; do
    CHID="$(git log -1 "$BRANCH" | grep_changeid)"
    if [[ ! -z "$CHID" ]] && contains $CHID $MERGED_CHANGES; then
        if contains "$BRANCH" $KEEP_BRANCHES; then
            echo "Keeping branch $BRANCH"
            continue
        else
            MERGED="${MERGED} ${BRANCH}"
        fi
    fi
done

if [[ -z "$MERGED" ]]; then
    echo "No already merged branches found"
    exit 0
fi

echo "==Already merged branches based on change-id:=="
for BRANCH in $MERGED; do
    echo "--[ $BRANCH ]--";
    PAGER= git log -1 $BRANCH
done
echo ""
echo ""
echo "if those seems ok you can execute:"
echo " git branch -D $MERGED"