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#!/usr/bin/env racket
#lang racket/base
;; burn-rate :: A little script to calculate my burn rate.
;;
;; Author: Ben Sima <bensima@gmail.com>
;; License: MIT
(require
(only-in racket/cmdline command-line))
(define (burn safe rate days)
(- safe (* rate days)))
(define (round-off z n) ; http://stackoverflow.com/a/16302176
(let ((power (expt 10 n)))
(/ (round (* power z)) power)))
(define (burn-fmt amount)
(format "You have $~a remaining this pay period!\n" (round-off amount 2)))
;;; CLI
(define safe-to-spend 0)
(define burn-rate 0)
(define days-left 0)
(define main
(command-line
#:usage-help
"Calculates your current burn rate, according to your Simple.com"
"account balances and days until your next paycheck."
#:once-each
[("-s" "--safe-to-spend") s "The amount left in Safe-to-Spend"
(set! safe-to-spend (string->number s))]
[("-b" "--burn-rate") b "How much you spend each day."
(set! burn-rate (string->number b))]
[("-d" "--days-left") d "How many days until next payheck."
(set! days-left (string->number d))]
#:multi
[("-o" "--offsets") o ("Additional money you know you have coming in later. Will simply be added to safe-to-spend.")
(set! safe-to-spend (+ safe-to-spend (string->number o)))]
#:args args
(if (= 0 (length args))
(printf "burn-rate :: A little script to calculate burn rate. Run with --help for instructions.\n")
(printf (burn-fmt (burn safe-to-spend burn-rate days-left))))))
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