Find branches that are removed/deleted from remote

git_branches.sh

#!/bin/zsh

#
# Checks local branches to see if the branch is on remote and tracking remote that is still there.
#
# Does not delete branches automatically, but will provide a command in cases where you have a local
# branch that is not on remote and is tracking a now-gone remote branch.
#

main() {
    current_branch=$(git branch-name)
    git fetch &> /dev/null

    # check if this repo has a development branch
    # git show-ref --verify --quiet refs/heads/development
    # has_development=$?

    # # check if this repo has a master branch
    # git show-ref --verify --quiet refs/heads/master
    # has_master=$?

    git branch --all | grep -vE "(remote|master|development)" | tr -d " *" | while read branch; do
        has_remote_branch=$(git branch --remotes | grep $branch | wc -l)
        if [[ $has_remote_branch -eq "0" ]]; then
            git checkout $branch &> /dev/null
            ref=$(git symbolic-ref -q HEAD)
            is_tracking=$(git for-each-ref --format='%(upstream:short)' "$ref" | sed '/^\s*$/d' | wc -l)
            if [[ $is_tracking -eq "1" ]]; then
                echo "Remote does not exist and tracking branch is gone: git branch --delete --force $branch"
            else
                echo "Branch $branch does not exist on remote"
            fi
        fi
    done

    git checkout $current_branch &> /dev/null
}

main