52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
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// Port of Sindre Sorhus' Sparkly to Rescript
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// reference implementation: https://github.com/sindresorhus/sparkly
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// Omitting rgb "fire" style, so no `chalk` dependency
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type sparklyConfig = {
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minimum: option<float>,
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maximum: option<float>
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}
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let sparkly = (
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numbers: list<float>,
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~options = {minimum: None, maximum: None}
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) => {
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// if not numbers is not an array, throw typeerror "Expected an array"
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// Unlike reference impl, we assume that all numbers are finite, i.e. no NaN.
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let ticks = ["▁", "▂", "▃", "▄", "▅", "▆", "▇", "█"]
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let minimum = switch options.minimum {
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| None => Js.Math.minimum(numbers)
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| Some(x) => x
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}
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let maximum = switch options.maximum {
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| None => Js.Math.maximum(numbers)
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| Some(x) => x
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}
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// Use a high tick if data is constant and max is not equal
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let ticks = if minimum == maximum && maximum != 0.0 {
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[ticks[4]]
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} else {
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ticks
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}
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let toMapWith = number => {
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let ret = if (! Js.Number.isFinite(number)) {
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" "
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} else {
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let tickIndex = Js.Math.ceil((number / maximum) * ticks.length) - 1
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let tickIndex = if maximum == 0.0 || tickIndex < 0 {
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0
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} else {
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tickIndex
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}
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ticks[tickIndex]
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}
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ret
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}
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let ret = map(toMapWith, numbers)
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Js.Array.joinWith("", ret)
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}
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