Prompt to select openstack environment

osauth.sh

#!/usr/bin/env bash

function osauth() {
    osauth_dir="~/.osauth"

    # List files in ~/.osauth
    tenant_paths=(~/.osauth/*.sh)
    # Strip the leading path
    tenant_files=(${tenant_paths[@]#~/.osauth/})
    # Strip the trailing file name
    tenants=(${tenant_files[@]/-openrc.sh/})

    if [ ${#tenants[@]} -eq 1 ]; then
        mytenant=${tenants[0]}
    else
        osauth_chooser
    fi

    echo "$mytenant selected"

    for file in ${tenant_paths[@]}; do
        # Determine if $file contains $mytenant
        if contains "$file" "$mytenant"; then
            source $file
        fi
    done
}

function osauth_chooser() {
    PS3="Select an Openstack tenant: "
    select option in ${tenants[@]}; do
        mytenant=$option
        break
    done
}

function contains() {
    string="$1"
    substring="$2"
    if test "${string#*$substring}" != "$string"
    then
        return 0    # $substring is in $string
    else
        return 1    # $substring is not in $string
    fi
}