CLI tool for merging dependabot PRs

dependabot-merge.sh

#! /usr/bin/env bash
set -eu

_usage(){
    cat<<EOF
Usage:
    ./dependabot-merge.sh get_branches | ./dependabot-merge.sh checkout_merge_push_delete

EOF
    _funcs | sed $'1i Functions:\n; s/^/    /'
}

function get_branches(){
    git branch --all | sed '/^ *remotes\/origin\/dependabot\//!d; s/ *remotes\/origin\///'
}

function checkout(){
    _branches_from_stdin_or_args "$@"
    for branch in "${branches[@]}"; do
        branch="$1"
        git fetch origin
        git checkout -b $branch origin/$branch
        #git merge master   # the github suggested way
        git merge --no-edit -s recursive -Xtheirs master
        #git rebase master  # github doesn't make the connection to the PR this way
    done
}

function merge_and_push(){
    _branches_from_stdin_or_args "$@"
    for branch in "${branches[@]}"; do
        git checkout master
        git merge --no-edit --no-ff $branch  # the github suggested way
        #git merge --ff-only $branch         # github doesn't make the connection to the PR this way
        git push origin master
    done
}

function delete(){
    _branches_from_stdin_or_args "$@"
    for branch in "${branches[@]}"; do
        git branch --delete --force $branch
    done
}

function delete_remote(){
    _branches_from_stdin_or_args "$@"
    for branch in "${branches[@]}"; do
        git branch --delete --remotes $branch
        git push --delete origin $branch
    done
}

function checkout_merge_push_delete(){
    _branches_from_stdin_or_args "$@"
    echo "branches2: ${branches[@]}"
    for branch in "${branches[@]}"; do
        for cmd in checkout merge_and_push delete delete_remote; do
            $cmd "$branch"
        done
    done
}

_branches_from_stdin_or_args(){
    if [[ -n "${branches[@]}" ]]; then
        return
    elif [[ -p /dev/stdin ]] || ! [[ -t 0 ]]; then
        echo "pipe"
        mapfile -t branches
    else
        echo "args"
        branches=("$@")
    fi
    echo "branches1: ${branches[@]}"
}

_funcs(){
    declare -F | awk '$2=="-f" && $3~/^[^_]/{print $3}'
}

_main(){
    if [[ -n "$@" ]]; then
        cmd="$1"; shift
        $cmd "$@"
    else
        _usage
    fi
}

_main "$@"