git_branch_cmd_diff.sh

#!/bin/bash
 set -e

function cmd() {
    branch=$(git branch --show-current)

    out_dir=.output/${branch}
    mkdir -p ${out_dir}

    targets=("dev" "stg" "prod")

    for target in ${targets[@]}; do
	echo 'kustomize build' ${branch}/${target} > ${out_dir}/${target}.yaml
    done
}

base_branch=main
current_branch=$(git branch --show-current)

git switch ${base_branch}

cmd 

git switch ${current_branch}

cmd

diff <(cat .output/${base_branch}/*.yaml)  <(cat .output/${current_branch}/*.yaml)