Switch all remotes in a git repo from HTTP to SSH (and vice-versa) with a single command. (Doesn't work perfectly right now. Be careful)

git-prot.sh

#!/bin/bash

TO_HTTP="false"
BASE_HOST="github.com"

function help-text() {
    echo "git-protocol-switcher (git-prot)"
    echo "    Switch all remotes in a git repo from HTTP to SSH (and vice-versa) with a single command."
    echo "    This assumes a host of https://github.com"
    echo
    echo "Usage:"
    echo "    git-prot -h        Display this message"
    echo "    git-prot           Switch the current repo from HTTP to SSH"
    echo "    git-prot -p http   Switch the current repo from SSH to HTTP"
    echo
}

while getopts ":hp:" opt; do
    case ${opt} in
        h )
            help-text
            exit 0
            ;;
        p )
            TO_HTTP="true"
            ;;
        \? )
            echo "Unknown option: -$OPTARG" 1>&2
            help-text
            exit 1
    esac
done

# Make sure we're in a valid repo
git rev-parse --git-dir >/dev/null 2>&1
if [ $? -ne 0 ]; then
    echo "This script can only be used inside a git repository."
    help-text
    exit 1
fi

echo

for remote in $(git remote); do
    old_url=$(git remote get-url ${remote})

    if [ "${TO_HTTP}" == "false" ]; then
        # Reject URLs already in SSH
        echo "${old_url}" | grep -iE ".*@${BASE_HOST}" >/dev/null 2>&1
        if [ $? -eq 0 ]; then
            continue
        fi

        tail=${old_url#*.com/}
        new_url="git@${BASE_HOST}:/${tail}"
    else
        # Reject URLs already in HTTP (case-insensitive)
        echo "${old_url}" | grep -iE "http.?://" >/dev/null 2>&1
        if [ $? -eq 0 ]; then
            continue
        fi
        
        tail=${old_url#*:/}
        new_url="https://${BASE_HOST}/${tail}"
    fi

    echo "Switching ${remote} from:"
    echo "    ${old_url}"
    echo "  to"
    echo "    ${new_url}"

    git remote set-url ${remote} ${new_url}

    if [ $? -eq 0 ]; then
        echo "Success"
    else
        echo "Failed. Error code: $?"
    fi

    echo
done