Good rebase on master and flake8 check for python project

rebase-git-i.sh

#!/bin/bash
function confirm() {
    # call with a prompt string or use a default
    read -r -p "$(echo -e $1) Are you sure? [y/N] " response
    case "$response" in
        [yY][eE][sS]|[yY]) 
            true
            ;;
        *)
            false
            ;;
    esac
}

function flake8master(){
    local flake8=$(git diff origin/master | python -m flake8 --diff --tee --output flake8.out.txt ; rm -rf flake8.out.txt)

    if [[ $flake8 ]]; then
        echo -e '\e[31mError\e[39m'
        echo $flake8
    else
        echo -e '\e[32mgood code\e[39m'
    fi
}

function rebasei(){
    if [ -z $1 ]; then
        BRANCH=$(git branch | grep \* | cut -d ' ' -f2-)
    else
        BRANCH=$1
    fi
    echo -e '\e[1m'$BRANCH'\e[21m'
    git fetch --all -q
    git checkout master -q
    git pull -q
    git checkout $BRANCH -q
    git status 
    git rebase -i master
    flake8master

    text='\e[1mforce push to '$BRANCH'?\e[21m'
    confirm "$text" && git push origin $BRANCH -f
}