README.md

A javascript library for homebrew beer calculations both in the browser and on the server. Features include:

• Support for multiple Javascript runtimes
  • Node.js 0.6.x, 0.8.x, 0.10.x, 0.11.x
  • Chrome, Firefox, Internet Explorer 9+, Safari, Opera, etc
• Calculate estimated OG, FG, IBU, ABV, SRM color, calories, and more
• Tinseth and Rager IBU calculation formula support
  • Pellets vs. whole hops support
  • Late addition boil support
  • Dry hopping support
• Automatically generated recipe instructions and timeline
• Estimate monetary recipe cost in USD based on ingredients
• Grade recipes based on recipe completeness
• Built-in unit conversions (kg <-> lb/oz, liter <-> gallon, temps, etc)
• Color in °SRM to name, °EBC, °Lovibond, RGB conversions, CSS color, etc
• Plugin support to add additional features
• Lightweight - about 28kb when minified

Plugins provide the following features:

• BeerXML import / export (brauhaus-beerxml)
• BJCP style catalog (brauhaus-styles)
• Recipe diffs (brauhaus-diff)

Brauhaus.js was developed with and for Malt.io, a community website for homebrewers to create recipes and share their love of homebrewing beer.

Interactive Examples

• Basic Example (Javascript)
• Basic Example (Coffeescript)
• Recipe Timeline (Coffeescript)
• BeerXML import (Coffeescript)
• BJCP Styles (Coffeescript)

Installation

There are two ways to use Brauhaus.js - either in a web browser (client-side) or on e.g. Node.js (server-side).

Web Browser (client-side use)

To use Brauhaus.js in a web browser, simply download the following file and include it as you would any other script:

• Download the latest brauhaus.min.js

Plugins:

• Download the latest brauhaus-beerxml.min.js
• Download the latest brauhaus-styles.min.js
• Download the latest brauhaus-diff.min.js

<script type="text/javascript" src="/scripts/brauhaus.min.js"></script>
<!-- Plugins go here... -->
<script type="text/javascript">
    // Your code goes here!
    // See below for an example...
</script>

Node.js (server-side use)

For Node.js, you can easily install Brauhaus.js and plugins using npm:

npm install brauhaus

Quick Example (CoffeeScript)

Here is an example of how to use the library from CoffeeScript:

# The following line is NOT required for web browser use
Brauhaus = require 'brauhaus'

# Import plugins here, e.g.
require 'brauhaus-beerxml'

# Create a recipe
r = new Brauhaus.Recipe
    name: 'My test brew'
    description: 'A new test beer using Brauhaus.js!'
    batchSize: 20.0
    boilSize: 10.0

# Add ingredients
r.add 'fermentable',
    name: 'Extra pale malt'
    color: 2.5
    weight: 4.2
    yield: 78.0

r.add 'hop',
    name: 'Cascade hops'
    weight: 0.028
    aa: 5.0
    use: 'boil'
    form: 'pellet'

r.add 'yeast'
    name: 'Wyeast 3724 - Belgian Saison'
    type: 'ale'
    form: 'liquid'
    attenuation: 80

# Set up a simple infusion mash
r.mash = new Brauhaus.Mash
    name: 'My mash'
    ph: 5.4

r.mash.addStep
    name: 'Saccharification'
    type: 'Infusion'
    time: 60
    temp: 68
    waterRatio: 2.75

# Calculate values
r.calculate()

# Print out calculated values
console.log "Original Gravity: #{ r.og.toFixed 3 }"
console.log "Final Gravity: #{ r.fg.toFixed 3 }"
console.log "Color: #{ r.color.toFixed 1 }° SRM (#{ r.colorName() })"
console.log "IBU: #{ r.ibu.toFixed 1 }"
console.log "Alcohol: #{ r.abv.toFixed 1 }% by volume"
console.log "Calories: #{ Math.round r.calories } kcal"

Quick Example (Javascript)

Here is an example of how to use the library form Javascript:

// The following line is NOT required for web browser use
var Brauhaus = require('brauhaus');

// Import plugins here, e.g.
require('brauhaus-beerxml');

// Create a recipe
var r = new Brauhaus.Recipe({
    name: 'My test brew',
    description: 'A new test beer using Brauhaus.js!',
    batchSize: 20.0,
    boilSize: 10.0
});

// Add ingredients
r.add('fermentable', {
    name: 'Extra pale malt',
    color: 2.5,
    weight: 4.2,
    yield: 78.0
});

r.add('hop', {
    name: 'Cascade hops',
    weight: 0.028,
    aa: 5.0,
    use: 'boil',
    form: 'pellet'
});

r.add('yeast', {
    name: 'Wyeast 3724 - Belgian Saison',
    type: 'ale',
    form: 'liquid',
    attenuation: 80
});

// Set up a simple infusion mash
r.mash = new Brauhaus.Mash({
    name: 'My mash',
    ph: 5.4
});

r.mash.addStep({
    name: 'Saccharification',
    type: 'Infusion',
    time: 60,
    temp: 68,
    waterRatio: 2.75
});

// Calculate values
r.calculate();

// Print out calculated values
console.log('Original Gravity: ' + r.og.toFixed(3));
console.log('Final Gravity: ' + r.fg.toFixed(3));
console.log('Color: ' + r.color.toFixed(1) + '° SRM (' + r.colorName() + ')');
console.log('IBU: ' + r.ibu.toFixed(1));
console.log('Alcohol: ' + r.abv.toFixed(1) + '% by volume');
console.log('Calories: ' + Math.round(r.calories) + ' kcal');

Brauhaus Configuration

The following values may be configured and will apply to all recipes, ingredients, etc.

Property	Type	Default	Description
BURNER_ENERGY	number	9000	Heat source output in kilojoules per hour
COLOR_NAMES	array	...	An array of color names for °SRM color ranges
MASH_HEAT_LOSS	number	5	Degrees C lost per hour during mash
RELATIVE_SUGAR_DENSITY	object	...	Keys are types of sugar, values are relative density
ROOM_TEMP	number	23	Room temperature in degrees C

Duration Functions

The following functions are available to parse and display durations of time:

Brauhaus.parseDuration (value)

Parse a string value into a duration in minutes. Supports many optional suffixes like w, wk, wks, week, weeks, d, day, days, h, hr, hrs, hour, hours, m, min, mins, minute, minutes, s, sec, second, and seconds.

>>> Brauhaus.parseDuration('2 days')
2880
>>> Brauhaus.parseDuration('1hr 3 minutes')
63
>>> Brauhaus.parseDuration('12')
12

Brauhaus.displayDuration (minutes, [approximate])

Generates a human-friendly display string from a number of minutes. Approximate, if set, determines the maximum number of units to return, rounding the last unit. For example, a setting of 2 would return days and hours; or hours and minutes; but never days, hours, and minutes.

>>> Brauhaus.displayDuration(65)
'1 hour 5 minutes'
>>> Brauhaus.displayDuration(2833)
'1 day 23 hours 13 minutes'
>>> Brauhaus.displayDuration(2833, 2)
'1 day 23 hours'
>>> Brauhaus.displayDuration(2833, 1)
'2 days'

Conversion Functions

The following functions are available to convert between various forms:

Brauhaus.kgToLb (number)

Convert kilograms to pounds.

>>> Brauhaus.kgToLb(2.5)
5.51155

Brauhaus.lbToKg (number)

Convert pounds to kilograms.

>>> Brauhaus.lbToKg(5.51155)
2.5

Brauhaus.kgToLbOz (number)

Convert kilograms to pounds and ounces.

>>> Brauhaus.kgToLbOz(2.5)
{
    lb: 5,
    oz: 8.184799999999996
}

Brauhaus.lbOzToKg (numberLbs, numberOz)

Convert pounds and ounces to kilograms.

>>> Brauhaus.lbOzToKg(5, 8.184799999999996)
2.5

Brauhaus.litersToGallons (number)

Convert liters to gallons.

>>> Brauhaus.litersToGallons(20.0)
5.283440000000001

Brauhaus.gallonsToLiters (number)

Convert gallons to liters.

>>> Brauhaus.gallonsToLiters(5.283440000000001)
20.0

Brauhaus.litersPerKgToQuartsPerLb (number)

Convert l/kg to qt/lb.

>>> Brauhaus.litersPerKgToQuartsPerLb(5.0)
2.3965285450000002

Brauhaus.quartsPerLbToLitersPerKg (number)

Convert qt/lb to l/kg.

>>> Brauhaus.quartsPerLbToLitersPerKg(2.3965285450000002)
5.0

Brauhaus.cToF (number)

Convert a temperature from celcius to fahrenheit.

>>> Brauhaus.cToF(20.0)
68.0

Brauhaus.fToC (number)

Convert a temperature from fahrenheit to celcius.

>>> Brauhaus.fToC(68.0)
20.0

Brauhaus.yieldToPpg (number)

Convert a yield percentage to parts per gallon.

>>> Brauhaus.yieldToPpg(75)
34.6605

Brauhaus.ppgToYield (number)

Convert parts per gallon to a yield percentage.

>>> Brauhaus.ppgToYield(34.6605)
75.0001

Color Conversions

Colors can be easily converted into various useful formats for the screen and web.

Brauhaus.srmToEbc (number)

Convert a color in °SRM to °EBC.

>>> Brauhaus.srmToEbc(10)
19.7

Brauhaus.ebcToSrm (number)

Convert a color in °EBC to °SRM.

>>> Brauhaus.ebcToSrm (20)
10.16

Brauhaus.srmToLovibond (number)

Convert a color in °SRM to °Lovibond.

>>> Brauhaus.srmToLovibond(10)
7.9433042964712826

Brauhaus.lovibondToSrm (number)

Convert a color in °Lovibond to °SRM.

>>> Brauhaus.lovibondToSrm(3.5)
3.9811000000000005

Brauhaus.srmToRgb (number)

Convert a color in °SRM to a RGB triplet.

>>> Brauhaus.srmToRgb(8)
[208, 88, 13]

Brauhaus.srmToCss (number)

Convert a color in °SRM to a form usable in a CSS color string.

>>> Brauhaus.srmToCss(8)
'rgb(208, 88, 14)'

Brauhaus.srmToName (number)

Convert a color in °SRM to a human-readable color.

>>> Brauhaus.srmToName(8)
'deep gold'

Other Utilities

Brauhaus.timeToHeat (liters, degrees)

Get the time in minutes to heat a volume of water in liters by a number of degrees C given the heat source defined by Brauhaus.BURNER_ENERGY.

>>> Brauhaus.timeToHeat(10.0, 80.0)
22.34666666666667

Brauhaus Objects

The following list of objects are available within Brauhaus:

• Fermentable
• Spice
• Yeast
• MashStep
• Mash
• Recipe

Serialization

A Brauhaus object can be easily serialized and deserialized from a JSON format. Deserialization can be from a JSON string or an object (i.e. the value given by JSON.parse(...)). For example, to serialize and deserialize a recipe object:

var r, serialized;

// Serialize
r = new Brauhaus.Recipe(...);
serialized = JSON.stringify(r);

// Deserialize from JSON string
serialized = '...';
r = new Brauhaus.Recipe(serialized);

// Deserialize from parsed object
serialized = JSON.parse('...');
r = new Brauhaus.Recipe(serialized);

Note: there is also a BeerXML plugin available which can serialize / deserialize BeerXML 1.0.

Brauhaus.Fermentable

A fermentable is some kind of a sugar that yeast can metabolize into CO2 and alcohol. Fermentables can be malts, malt extracts, honey, sugar, etc. Each fermentable can have the following properties:

Property	Type	Default	Description
color	number	2.0	Color in °SRM
late	bool	false	Late addition
name	string	New fermentable	Name of the fermentable
weight	number	1.0	Weight in kilograms
yield	number	75.0	Percentage yield

Fermentable.prototype.addition ()

Get the addition type of fermentable, one of mash, steep, or boil.

>>> f.addition()
'steep'

Fermentable.prototype.colorRgb ()

Get the color triplet for this fermentable. Shortcut for Brauhaus.srmToRgb(f.color).

>>> f.colorRgb()
[233, 157, 63]

Fermentable.prototype.colorCss ()

Get the CSS-friendly color string for this fermentable. Shortcut for Brauhaus.srmToCss(f.color).

>>> f.colorCss()
'rgb(233, 157, 63)'

Fermentable.prototype.colorName ()

Get the human-readable name for the color of this fermentable. Shortcut for Brauhaus.srmToName(f.color).

>>> f.colorName()
'deep gold'

Fermentable.prototype.gu (number)

Get the gravity units of this fermentable for a number of liters, based on the weight and yield. These units make the original gravity when divided by 1000 and added to one.

>>> f.gu(20.0)
32

Fermentable.prototype.plato (number)

Get the gravity in degrees plato for this fermentable for a number of liters, based on the weight and yield.

>>> f.plato(20.0)
7.5301

Fermentable.prototype.ppg ()

Get the parts per gallon from the yield percentage.

>>> f.ppg()
36

Fermentable.prototype.price ()

Guess the price in USD per kilogram of this fermentable, based on the name. Prices are an approximation based on multiple online homebrew supply store prices. You should use toFixed(2) to display these.

>>> f.price()
13.5025

Fermentable.prototype.type ()

Get the type of fermentable, either extract or grain.

>>> f.type()
'grain'

Fermentable.prototype.weightLb ()

A shortcut for Brauhaus.kgToLb(f.weight) to get the weight in pounds.

>>> f.weightLb()
2.2

Fermentable.prototype.weightLbOz ()

A shortcut for Brauhaus.kgToLbOz(f.weight) to get the weight in pounds and ounces.

>>> f.weightLbOz()
{
    lb: 2,
    oz: 4.3
}

Brauhaus.Spice

A spice is some kind of substance added to flavor or protect a brew. Spices can be hops, coriander, orange peel, cinnamon, whirlfloc, Irish moss, rose hips, etc. Each spice can have the following properties:

Property	Type	Default	Description
aa	number	0.0	Alpha-acid percentage (0 - 100)
form	string	pellet	Form, like pellet, whole, ground, crushed, etc
name	string	New spice	Name of the spice
time	number	60	Time in minutes to add the spice
use	string	boil	When to use the spice (mash, boil, primary, etc)
weight	number	1.0	Weight in kilograms

Spice.prototype.bitterness (ibuMethod, earlyOg, batchSize)

Calculate the IBU of a spice for the given method, early OG, and batch size in liters. Available methods are 'tinseth' and 'rager'. The early OG is usually calculated as the sum of gravity values for all non-late fermentables.

>>> s.bitterness('tinseth', 1.045, 19)
12.4

Spice.prototype.dry ()

True if the spice is added after the boil, otherwise false. This is useful for determining if dry hopping is taking place.

>>> s.dry()
false

Spice.prototype.price ()

Guess the price in USD per kilogram of this spice, based on the name. Prices are an approximation based on multiple online homebrew supply store prices. You should use toFixed(2) to display these.

>>> s.price()
2.5318

Spice.prototype.utilizationFactor ()

Get the utilization factor based on the form of a spice. For example, pellets are easier to utilize than whole leaf hops.

>>> s.utilizationFactor()
1.15

Spice.prototype.weightLb ()

A shortcut for Brauhaus.kgToLb(s.weight) to get the weight in pounds.

>>> s.weightLb()
0.0625

Spice.prototype.weightLbOz ()

A shortcut for Brauhaus.kgToLbOz(s.weight) to get the weight in pounds and ounces.

>>> s.weightLbOz()
{
    lb: 0,
    oz: 1
}

Brauhaus.Yeast

Yeast are the biological workhorse that transform sugars into alcohol. Yeast can be professional strains like Wyeast 3068, harvested from bottles, harvested from the air, or other bugs like bacteria that produce acid.

Property	Type	Default	Description
attenuation	number	75.0	Percentage of sugars the yeast can convert
form	string	liquid	Liquid or dry
name	string	New yeast	Name of the yeast
type	string	ale	Ale, lager, or other

Yeast.prototype.price ()

Guess the price in USD per packet of this yeast, based on the name. Prices are an approximation based on multiple online homebrew supply store prices. You should use toFixed(2) to display these.

>>> y.price()
7

Brauhaus.MashStep

A single step in a multi-step mash, such as infusing water, changing the temperature, or decocting mash to boil.

Property	Type	Default	Description
endTemp	number	unset	Temperature in degrees C after this step
name	string	Saccharification	A name to give this step
rampTime	number	unset	Time in minutes to ramp to the given temperature
temp	number	68	Temperature in degrees C to hold the mash
time	number	60	Duration of this step in minutes
type	string	Infusion	Type of mash step: Infusion, Temperature, or Decoction
waterRatio	number	3.0	Ratio in liters per kg of water to infuse or decoct

MashStep.types

An array of available mash step types: Infusion, Temperature, and Decoction. They can generally be broken down as follows:

• Infusion: adding hot water to the mash to raise its overall temperature
• Temperature: usually adding heat via some source, like a stovetop or gas burner
• Decoction: removing and boiling some of the mash, then adding it back to raise the overall temperature

---

MashStep.prototype.description ([boolean], [number])

An automatically generated description of the step. If the first argument is true, then use SI units (liters, kilograms, celcius). If it is false, then use quarts, pounds and fahrenheit. If a second argument is passed, then it is used as the total grain weight of the recipe to determine the exact amount of water or mash to add/remove.

>>> mashStep.description()
'Infuse 3.0l per kg of grain for 60 minutes at 68C'
>>> mashStep.description(false)
'Infuse 1.44qt per lb of grain for 60 minutes at 154.4F'
>>> mashStep.description(true, 3.3)
'Infuse 10.0l for 60 minutes at 68C'
>>> mashStep.description(false, 3.3)
'Infuse 10.57qt for 60 minutes at 154.4F'

MashStep.prototype.endTempF ()

Get the step end temperature in degrees F. Shortcut for Brauhaus.cToF(mashStep.endTemp).

>>> mashStep.endTempF()
150.0

MashStep.prototype.tempF ()

Get the step temperature in degrees F. Shortcut for Brauhaus.cToF(mashStep.temp).

>>> mashStep.tempF()
154.0

MashStep.prototype.waterRatioQtPerLb ()

Get the water ratio in quarts per pound of grain. Shortcut for Brauhaus.litersPerKgToQtPerLb(mashStep.waterRatio).

>>> mashStep.waterRatioQtPerLb()
1.5

Brauhaus.Mash

A recipe mash description for all-grain or partial-mash recipes. The mash includes information like a name, notes for the brewer, grain temperature, PH, etc.

Property	Type	Default	Description
grainTemp	number	23	Grain temperature in degrees C
name	string	unset	Name of the mash, e.g. Single step infusion @68C
notes	string	unset	Notes for the brewer
ph	number	unset	Target PH of the mash
spargeTemp	number	76	Sparge temperature in degrees C
steps	array	[]	A list of Brauhaus.MashStep objects

Mash.prototype.addStep (object)

Add a new mash step with the passed options.

>>> mash.prototype.addStep({
    name: 'Test step',
    type: 'Infusion',
    waterRatio: 3.0,
    temp: 68,
    time: 60
})

Mash.prototype.grainTempF ()

Get the grain temperature in degrees F. Shortcut for Brauhaus.cToF(mash.grainTemp).

>>> mash.grainTempF()
75.0

Mash.prototype.spargeTempF ()

Get the sparge temperature in degrees F. Shortcut for Brauhaus.cToF(mash.spargeTemp).

>>> mash.spargeTempF()
170.0

Brauhaus.Recipe

A beer recipe, containing ingredients like fermentables, spices, and yeast. Calculations can be made for bitterness, alcohol content, color, and more. Many values are unset by default and will be calculated when the Recipe.prototype.calculate() method is called. The brewDayDuration, boilStartTime and boilEndTime are unset until the Recipe.prototype.timeline() method is called.

Property	Type	Default	Description
abv	number	unset	Alcohol percentage by volume
abw	number	unset	Alcohol percentage by weight
agingDays	number	14.0	Number of days to age keg/bottles
agingTemp	number	20.0	Temperature during aging in °C
author	string	Anonymous Brewer	Recipe author
batchSize	number	20.0	Total size of batch in liters
boilSize	number	10.0	Size of wort that will be boiled in liters
boilStartTime	number	unset	Time in minutes when the boil starts
boilEndTime	number	unset	Time in minutes when the boil ends
bottlingPressure	number	0.0	Bottle pressure in volumes of CO2
bottlingTemp	number	0.0	Bottling temperature in °C
brewDayDuration	number	unset	Duration in minutes for the brew day
buToGu	number	unset	Bitterness units to gravity units ratio
bv	number	unset	Balance value (bitterness / sweetness ratio)
calories	number	unset	Calories per serving (kcal)
color	number	unset	Color in °SRM
description	string	Recipe description	Recipe description text
fermentables	array	[]	Array of Brauhaus.Fermentable objects
fg	number	unset	Final gravity (e.g. 1.012)
fgPlato	number	unset	Final gravity in °Plato
ibu	number	unset	Bitterness in IBU
ibuMethod	string	tinseth	IBU calculation method, tinseth or rager
mashEfficiency	number	75.0	Efficiency percentage for the mash
name	number	New recipe	Recipe name text
og	number	unset	Original gravity (e.g. 1.048)
ogPlato	number	unset	Original gravity in °Plato
price	number	unset	Approximate price in USD
primaryDays	number	14.0	Number of days in primary fermenter
primaryTemp	number	20.0	Temperature of primary fermenter in °C
primingCornSugar	number	unset	Kg of corn sugar to prime
primingDme	number	unset	Kg of dry malt extract to prime
primingHoney	number	unset	Kg of honey to prime
primingSugar	number	unset	Kg of (table) sugar to prime
realExtract	number	unset	Real extract of the recipe
secondaryDays	number	0.0	Number of days in secondary fermenter
secondaryTemp	number	0.0	Temperature of secondary fermenter in °C
servingSize	number	0.355	Serving size in liters
steepTime	number	20	Time in minutes to steep ingredients
spices	array	[]	Array of Brauhaus.Spice objects
steepEfficiency	number	50.0	Efficiency percentage for steeping
steepTime	number	20.0	Time to steep in minutes
style	object	null	Recipe style (see Brauhaus.STYLES)
tertiaryDays	number	0.0	Number of days in tertiary fermenter
tertiaryTemp	number	0.0	Temperature of tertiary fermenter in °C
timelineMap	object	null	Map used to generate a brew timeline
yeast	array	[]	Array of Brauhaus.Yeast objects

Recipe.prototype.add (type, data)

Add a new ingredient to the recipe. type can be one of fermentable, hop, spice, or yeast. The data is what will be sent to the constructor of the ingredient defined by type.

>>> r.add('fermentable', {
    name: 'Pale malt',
    weight: 4.0,
    yield: 75,
    color: 3.5
});
>>> r.fermentables
[<Brauhaus.Fermentable object 'Pale malt'>]

>>> r.add('hop', {
   name: 'Cascade',
   weight: 0.028,
   time: 60,
   aa: 5.3,
   form: 'pellet'
});

>>> r.add('spice', {
    name: 'Coriander',
    weight: 0.014
    time: 5
    form: 'ground'
});

>>> r.add('yeast', {
   name: 'Wyeast 3056'
   type: 'ale'
   form: 'liquid'
   attenuation: 75
});

Recipe.prototype.batchSizeGallons ()

Get the recipe batch size in gallons. Shortcut for Brauhaus.litersToGallons(r.batchSize).

>>> r.batchSizeGallons()
5.025

Recipe.prototype.boilSizeGallons ()

Get the recipe boil size in gallons. Shortcut for Brauhaus.litersToGallons(r.boilSize).

>>> r.boilSizeGallons()
3.125

Recipe.prototype.bottleCount ()

Get the total number of whole bottles (i.e. servings) for this recipe. This is a shortcut that is equivalent to Math.floor(r.batchSize / r.servingSize).

>>> r.bottleCount()
56

Recipe.prototype.calculate ()

Calculate alcohol, bitterness, color, gravities, etc. This method must be called before trying to access those values. See the quick examples above for a more complete example of calculate() usage.

>>> r.calculate()
>>> r.ibu
28.5

Recipe.prototype.grade ()

Grade this recipe's completeness. Returned is a Number, where a completely blank recipe is zero and the higher the number, the higher the recipe completeness / quality. Some items carry more weight than others.

>>> r.grade()
4.5

Recipe.prototype.grainWeight ()

Get the total grain weight in kg. Note that this only includes fermentables that are mashed or steeped. Things like malt extract syrup are excluded.

>>> r.grainWeight()
4.0

Recipe.prototype.scale (newBatchSize, newBoilSize)

Scale a recipe and its ingredients to a new batch size and boil size in liters. Gravity and bitterness units are preserved. This does not recalculate the recipe, it merely adjusts various weights and volumes.

>>> r.scale(10, 6.5)
>>> r.calculate()
>>> r.ibu
28.5

Recipe.prototype.timeline (siUnits=true)

Generate a brew timeline from a recipe. If siUnits is true, then generate the timeline in metric units, otherwise output imperial units. Returns a list of [duration, description] items where duration is a time in minutes from the start of the recipe and description is the step description text.

>>> r.timeline()
[
    [0, 'Heat 10l of water to 68C (about 20 minutes)'],
    [20, 'Add 1kg CaraMunich (10 GU) and steep for 20 minutes'],
    [40.16, 'Remove grains. This is now your wort. Top up to 10l and bring to a boil (about 12 minutes)'],
    [62.52, 'Add 28g of Cascade hops (30 IBU)'],
    ...
]

It's possible to display a human-friendly version of this information with some utility methods used in a loop. For example:

>>> timeline = r.timeline()
>>> for (var x = 0; x < timeline.length; x++) {
>>>     var duration = timeline[x][0];
>>>     var description = timeline[x][1];
>>>     console.log(Brauhaus.displayDuration(duration, 2) + ': ' + description);
>>> }
start: Heat 10l of water to 68C (about 20 minutes)
20 minutes: Add 1kg CaraMunich (10 GU) and steep for 20 minutes
40 minutes: Remove grains. This is now your wort. Top up to 10l and bring to a boil (about 12 minutes)
63 minutes: Add 28g of Cascade hops (30 IBU)
...

It is also possible to determine the hop additions relative to the start and end of the boil. This allows you to nicely display the boil additions as relative times (e.g. -60 minutes, -45 minutes, -5 minutes to the end of the boil). Anything before the boilStartTime is the mash, steep, or heating to boil, while anything after the boilEndTime is chilling, fermentation and bottling. The brewDayDuration ends when fermentation begins. The exact point of bottling can be determined with a combination of brewDayDuration, primaryDays, secondaryDays, and tertiaryDays.

>>> timeline = r.timeline()
>>> console.log(r.boilStartTime)
62.52
>>> console.log(r.boilEndTime)
122.52

Contributing

Contributions are welcome - just fork the project and submit a pull request when you are ready!

Getting Started

First, create a fork on GitHub. Then:

git clone ...
cd brauhausjs
npm install

Also, if you do not have Gulp installed:

sudo npm install -g gulp

Style Guide

Brauhaus uses the CoffeeScript Style Guide with the following exceptions:

1. Maximum line length is 120 characters

When building brauhaus.js with gulp compile or npm test you will see the output of CoffeeLint, a static analysis code quality tool for CoffeeScript. Please adhere to the warnings and errors to ensure your changes will build.

Unit Tests

Before submitting a pull request, please add any relevant tests and run them via:

gulp test

If you have PhantomJS installed and on your path then you can use:

CI=true gulp test

Pull requests will automatically be tested by Travis CI both in Node.js 0.10+ and in a headless webkit environment (PhantomJS). Changes that cause tests to fail will not be accepted. New features should be tested to be accepted.

New tests can be added in the test directory. If you add a new file there, please don't forget to update the test.html to include it!

Code Coverage

You can generate a unit test code coverage report for unit tests using the following:

gulp coverage

You can find an HTML report in the coverage directory that is created. This report will show line-by-line code coverage information.

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Please note that all contributions will be licensed under the MIT license in the following section.

License

http://dgt.mit-license.org/