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Add options for units in number_to_human #55

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Add options for units in number_to_human #55

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43 changes: 36 additions & 7 deletions lib/number/human.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,30 @@ defmodule Number.Human do
iex> Number.Human.number_to_human(Decimal.new("5000.0"))
"5.00 Thousand"

iex> Number.Human.number_to_human(123, units: ["B", "KB", "MB", "GB", "TB", "PB"])
"123.00 B"

iex> Number.Human.number_to_human(1234, units: ["B", "KB", "MB", "GB", "TB", "PB"])
"1.23 KB"

iex> Number.Human.number_to_human(999001, units: ["B", "KB", "MB", "GB", "TB", "PB"])
"999.00 KB"

iex> Number.Human.number_to_human(1234567, units: ["B", "KB", "MB", "GB", "TB", "PB"])
"1.23 MB"

iex> Number.Human.number_to_human(1234567890, units: ["B", "KB", "MB", "GB", "TB", "PB"])
"1.23 GB"

iex> Number.Human.number_to_human(1234567890123, units: ["B", "KB", "MB", "GB", "TB", "PB"])
"1.23 TB"

iex> Number.Human.number_to_human(1234567890123456, units: ["B", "KB", "MB", "GB", "TB", "PB"])
"1.23 PB"

iex> Number.Human.number_to_human(1234567890123456789, units: ["B", "KB", "MB", "GB", "TB", "PB"])
"1,234.57 PB"

iex> Number.Human.number_to_human('charlist')
** (ArgumentError) number must be a float, integer or implement `Number.Conversion` protocol, was 'charlist'

Expand All @@ -58,23 +82,28 @@ defmodule Number.Human do
end

def number_to_human(number, options) do
units = Keyword.get(options, :units, [])

cond do
compare(number, ~d(999)) == :gt && compare(number, ~d(1_000_000)) == :lt ->
delimit(number, ~d(1_000), "Thousand", options)
compare(number, ~d(1_000)) == :lt ->
delimit(number, ~d(1), Enum.at(units, 0, ""), options)

compare(number, ~d(1_000)) in [:gt, :eq] && compare(number, ~d(1_000_000)) == :lt ->
delimit(number, ~d(1_000), Enum.at(units, 1, "Thousand"), options)

compare(number, ~d(1_000_000)) in [:gt, :eq] and compare(number, ~d(1_000_000_000)) == :lt ->
delimit(number, ~d(1_000_000), "Million", options)
delimit(number, ~d(1_000_000), Enum.at(units, 2, "Million"), options)

compare(number, ~d(1_000_000_000)) in [:gt, :eq] and
compare(number, ~d(1_000_000_000_000)) == :lt ->
delimit(number, ~d(1_000_000_000), "Billion", options)
delimit(number, ~d(1_000_000_000), Enum.at(units, 3, "Billion"), options)

compare(number, ~d(1_000_000_000_000)) in [:gt, :eq] and
compare(number, ~d(1_000_000_000_000_000)) == :lt ->
delimit(number, ~d(1_000_000_000_000), "Trillion", options)
delimit(number, ~d(1_000_000_000_000), Enum.at(units, 4, "Trillion"), options)

compare(number, ~d(1_000_000_000_000_000)) in [:gt, :eq] ->
delimit(number, ~d(1_000_000_000_000_000), "Quadrillion", options)
delimit(number, ~d(1_000_000_000_000_000), Enum.at(units, 5, "Quadrillion"), options)

true ->
number_to_delimited(number, options)
Expand Down Expand Up @@ -126,6 +155,6 @@ defmodule Number.Human do
|> Decimal.div(divisor)
|> number_to_delimited(options)

number <> " " <> label
String.trim(number <> " " <> label)
end
end