cleanup-gerrit-branches

#!/bin/bash

# Copied from https://blog.mandre.org/2017/10/22/cleanup_local_git_branches_gerrit_case.html

function prompt_for_missing_commit {
    commit=$1
    branch=$2
    current_branch=$3
    git log --oneline -n1 $commit
    read -p "Commit $commit in $branch is missing from $current_branch. Inspect? [Yn] " answer
    if ! [[ "${answer}" =~ ^(n|no)$ ]]; then
        git show $commit
    fi
}

function prompt_for_commit_diff {
    local_commit=$1
    merged_commit=$2
    local_branch=$3
    current_branch=$4
    git log --oneline -n1 $commit
    read -p "Commit $local_commit in $local_branch and $merged_commit in $current_branch differ. Inspect? [Yn] " answer
    if ! [[ "${answer}" =~ ^(n|no)$ ]]; then
        interdiff <(git show $local_commit) <(git show $merged_commit) | colordiff
    fi
}

current_branch=$(git symbolic-ref --short HEAD)

if [ "$current_branch" != "main" ]; then
    echo "This script should be run from the main branch" >&2
    exit 1
fi


for branch in $(git for-each-ref --format='%(refname:short)' refs/heads/); do
    if [ "$branch" == "$current_branch" ]; then
        continue
    fi
    echo
    echo "Checking branch $branch"
    branch_differs=0
    for commit in $(git log --no-merges --pretty=format:"%h" ${current_branch}..${branch}); do
        change_id=$(git log -n1 --pretty=format:%b $commit | awk '/Change-Id:/ {print $0}')
        if [ -z "$change_id" ]; then
            branch_differs=1
            #prompt_for_missing_commit $commit $branch $current_branch
            continue
        fi
        merged_commit=$(git log --pretty=format:%h --grep "$change_id" ${current_branch})
        if [ -z "$merged_commit" ]; then
            branch_differs=1
            #prompt_for_missing_commit $commit $branch $current_branch
            continue
        else
            # Check that the merged patch is similar to what is in local branch
            # NOTE needs interdiff from patchutils and colordiff
            if [[ $(interdiff <(git show $commit) <(git show $merged_commit) 2>&1) ]]; then
                branch_differs=1
                #prompt_for_commit_diff $commit $merged_commit $branch $current_branch
            fi
        fi
    done
    if [ $branch_differs -eq 0 ]; then
        read -p "$branch fully merged. Delete? [yN] " answer
        if [[ "${answer}" =~ ^(y|yes)$ ]]; then
            git branch -D $branch
        fi
    elif [[ "$branch" =~ ^review/[^s][^h].*  ]]; then
        read -p "$branch is a gerrit review branch. Delete? [yN] " answer
        if [[ "${answer}" =~ ^(y|yes)$ ]]; then
            git branch -D $branch
        fi
    else
        continue
        read -p "$branch differs from $current_branch. Delete anyway? [yN] " answer
        if [[ "${answer}" =~ ^(y|yes)$ ]]; then
            git branch -D $branch
        fi
    fi
done