Quickly switch direnv env vars

denv

#!/bin/bash
#
# For easily switching between .envrc files.
#
# This allows you to have and use multiple .envrc files in the same 
# directory, like .envrc.test, .envrc.local and .envrc.prod.
#
# Usage: 
#
# denv [extension]
# Replaces the current .envrc file by .envrc.[extension]
#
# Examples: 
#
# denv test
# Replaces the contents of .envrc by those of .envrc.test, then allows it. 
#
# denv +
# Runs direnv allow
#
# denv .
# Runs direnv allow
#
# denv -
# Runs direnv deny
#
# denv
# Runs direnv deny

suffix=$1

if [[ -z "${suffix}" ]]; then
        echo "suffix not given, running deny"
        direnv deny
        exit 0
elif [[ "${suffix}" == '-' ]]; then
        echo "suffix is '-', running deny"
        direnv deny
        exit 0
elif [[ "${suffix}" == '+' ]]; then
        echo "suffix is '+', running allow"
        direnv allow
        exit 0
elif [[ "${suffix}" == '.' ]]; then
        echo "suffix is '.', running allow"
        direnv allow
        exit 0
fi

envrc_filename=".envrc.$suffix"

if [[ -f "${envrc_filename}" ]]; then
        cp "${envrc_filename}" .envrc
        echo "running direnv allow with file ${envrc_filename}"
        direnv allow
else
        echo ".envrc file with suffix $suffix does not exist"
fi