brewtility

A Clojure(Script) utility library for all of your brewing needs.

Installation

A deployed copy of the most recent version of brewtility can be found on clojars. To use it, add the following as a dependency in your project.clj file:

The next time you build your application, Leiningen or deps.edn should pull it automatically. Alternatively, you may clone or fork the repository to work with it directly.

Expectations

This library is designed to work in conjunction with the common-beer-format. The functions within the library make one main assumptions based on that fact:

1. All measurements are expected to be in the International System of Units, also known as the modern metric system. Since many brewing applications, especially those based in America, operate on Imperial Measurements, conversion utilities have been provided in the brewtility.units namespace.

Provided Functionality

Below are examples of provided functionality for each namespace. The library does provide access to other functions, but those primarily exist in support of those outlined here.

Calculations

Beer Color Calculation

Given a collection of common-beer-format conforming fermentables, and a conformed batch-size in liters, return the projected color of the beer in one of the following color scales:

• Malt Color Units (MCU)
• Standard Reference Method (SRM)
• European Brewery Convention (EBC)
• Lovibond
• Red/Green/Blue/Alpha (RGBA)

(:require [brewtility.calculations :refer :all]
          [common-beer-format.data.fermentables.grains :as grains]
          [common-beer-format.data.fermentables.adjuncts :as adjuncts])

(def recipe-fermentables
  [(assoc (:rye-malt grains/grains) :amount 7)
   (assoc (:pale-malt-2-row-us grains/grains) :amount 3)
   (assoc (:rice-hulls adjuncts/adjuncts) :amount 2)
   (assoc (:grits adjuncts/adjuncts) :amount 4)])

(def batch-size 15)

(calculate-malt-color-units recipe-fermentables batch-size)
;; => 20.784

(calculate-srm-color recipe-fermentables batch-size)
;; => 21.273

(calculate-ebc-color recipe-fermentables batch-size)
;; => 20.41.907

(calculate-lovibond-color recipe-fermentables batch-size)
;; => 41.907

(calculate-rgba-color recipe-fermentables batch-size)
;; => "rgba(149,45,0,1)"

Gravity and ABV Calculation

Given a collection of common-beer-format conforming fermentables and a conformed batch-size in liters, project the original gravity and estimate the ABV.

(:require [brewtility.calculations :refer :all]
          [common-beer-format.data.fermentables.grains :as grains]
          [common-beer-format.data.fermentables.adjuncts :as adjuncts])

(def recipe-fermentables
  [(assoc (:rye-malt grains/grains) :amount 7)
   (assoc (:pale-malt-2-row-us grains/grains) :amount 3)
   (assoc (:rice-hulls adjuncts/adjuncts) :amount 2)
   (assoc (:grits adjuncts/adjuncts) :amount 4)])

(def batch-size 19)

(calculate-potential-gravity fermentables batch-size)
;; => 1.146

(calculate-potential-final-gravity fermentables batch-size)
;; => 1.036

;; Reminder: All percentages are treated as decimals
(calculate-potential-abv fermentables batch-size)
;; => 0.147

(def my-yeast-attenuation 1.00)

;; Reminder: All percentages are treated as decimals
(calculate-potential-abv fermentables batch-size my-yeast-attenuation)
;; => 0.197

IBU Calculation

Given a collection of common-beer-format conforming hops, batch-size, and potential-gravity, calculate the number of IBUs generated.

(:require [brewtility.calculations :refer :all]
          [common-beer-format.data.hops.both :as hops])

(def hops
  [(assoc (:el-dorado hops/both) :amount 0.01 :time 60)]
   (assoc (:horizon hops/both) :amount 0.02 :time 10)])

(def batch-size 15)
(def potential-gravity 1.03)

(calculate-recipe-ibus hops batch-size potential-gravity)
;; => 42.795

Color

Color Unit Conversion

Given a color measurement in one of the three most common systems, convert between each system of measure. Supported color systems are as follows:

• Standard Reference Method (SRM)
• European Brewery Convention (EBC)
• Lovibond

(:require [brewtility.color :refer :all])

(lovibond->srm 7.94)
;; => 10.0

(srm->ebc 23.1)
;; => 45.51

(ebc->lovibond 60.38)
;; => 23.2

Display Color Lookup

Given a color measurement in one of the three most common systems, look up a corresponding RGBA color. These functions are opinionated, and support and normalize down to the most common SRM scale: 1-40. Supported color systems are as follows:

• Standard Reference Method (SRM)
• European Brewery Convention (EBC)
• Lovibond

(:require [brewtility.color :refer :all])

(lovibond->rgba 0.56)
;; => "rgba(255,230,153,1)"

(srm->rgba 6.2)
;; => "rgba(248,166,0,1)"

(ebc->rgba 25.61)
;; => "rgba(203,98,0,1)"

Precision

Approximation

Returns true iff n2 approximates n1 within variance percent.

(:require [brewtility.precision :refer :all])

(approximates? 100 90 0.1)
;; => true

(approximates? 100 90 0.01)
;; => false

Decimal Place Rounding

Given a number, round it to a set number of places after the decimal point.

(:require [brewtility.precision :refer :all])

(->1dp 5.05)
;; => 5.1

(->2dp -100.005)
;; => -100.01

(->3dp 404.0004654)
;; => 404.0

Units

Volume Conversion

Given a volume in source-measurement, convert it to the target-measurement. Supported measurements are:

• Teaspoon
• Tablespoon
• Imperial Fluid Ounce
• American Fluid Ounce
• Cup
• Imperial Pint
• American Pint
• Imperial Quart
• American Quart
• Imperial Gallon
• American Gallon
• Litre (Or Liter, depending on regional convention)
• Millilitre (Or Milliliter, depending on regional convention)

(:require [brewtility.units :refer :all])

(convert-volume 1.0 :liter :litre)
;; => 1.0

(convert-volume 20 :teaspoon :liter)
;; => 0.099

(convert-volume 9.99209 :imperial-pint :american-pint)
;; => 12.0

Weight Conversion

Given a weight in source-measurement, convert it to the target-measurement. Supported measurements are:

• Ounce
• Pound
• Milligram
• Gram
• Kilogram

(:require [brewtility.units :refer :all])

(convert-weight 1.0 :kilogram :kilogram)
;; => 1.0

(convert-weight 15.0 :pound :ounce)
;; => 240.0

(convert-weight 1205.5 :milligram :pound)
;; => 0.003

Temperature Conversion

Given a temperature in source-measurement, convert it to the target-measurement. Supported measurements are:

• Celsius (Or Centigrade, depending on regional convention. Or C, for convenience)
• Kelvin (Or K, for convenience)
• Fahrenheit (Or F, for convenience)

(:require [brewtility.units :refer :all])

(convert-temperature 32.0 :fahrenheit :fahrenheit)
;; => 32.0

(convert-temperature 0.0 :c :f)
;; => 32.0

(convert-temperature 2016.3 :kelvin :c)
;; => 1743.15

Testing

doo, a Leiningen plugin used to run ClojureScript tests in many JS environments, is already in project.clj. Karma is used as the test runner, and is included in package.json.

To install Karma, simply install the Node package:

npm install

Then build the application and run the tests:

lein test-build

The tests will also execute on the JVM, to ensure the library is compatible for apps in both deployment environments.

License

Copyright © 2020 - Wall Brew Co

This software is provided for free, public use as outlined in the MIT License