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a55327c7ef
Adds a sparkline(array|map) built-in that renders numeric values as a Unicode block-character string (▁▂▃▄▅▆▇█), plus a new `mlr sparkline` verb that summarizes each field's values in record order -- useful for eyeballing trends without external plotting tools. Also adds `-s` to `mlr histogram` to sparkline a field's binned counts (its distribution shape) rather than emitting one record per bin. This is a different chart from `mlr sparkline` (order-independent binning vs. record-order values), and the docs for each cross-reference the other to avoid conflating them. Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
package bifs
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/johnkerl/miller/v6/pkg/mlrval"
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)
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func TestBIF_sparkline(t *testing.T) {
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// Needs array or map
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input := mlrval.FromInt(3)
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output := BIF_sparkline(input)
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assert.True(t, output.IsError())
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// Non-numeric element
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input = mlrval.FromArray([]*mlrval.Mlrval{
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mlrval.FromInt(1),
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mlrval.FromString("abc"),
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})
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output = BIF_sparkline(input)
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assert.True(t, output.IsError())
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// Empty array is void
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input = mlrval.FromArray([]*mlrval.Mlrval{})
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output = BIF_sparkline(input)
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assert.True(t, output.IsVoid())
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// Ascending values span the full tick range, low to high
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input = mlrval.FromArray([]*mlrval.Mlrval{
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mlrval.FromInt(1),
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mlrval.FromInt(2),
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mlrval.FromInt(3),
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mlrval.FromInt(4),
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mlrval.FromInt(5),
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mlrval.FromInt(6),
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mlrval.FromInt(7),
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mlrval.FromInt(8),
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})
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output = BIF_sparkline(input)
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assert.True(t, mlrval.Equals(output, mlrval.FromString("▁▂▃▄▅▆▇█")))
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// Same value throughout maps to the lowest tick
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input = mlrval.FromArray([]*mlrval.Mlrval{
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mlrval.FromInt(3),
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mlrval.FromInt(3),
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mlrval.FromInt(3),
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})
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output = BIF_sparkline(input)
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assert.True(t, mlrval.Equals(output, mlrval.FromString("▁▁▁")))
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// Map input follows insertion order
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input = array_to_map_for_test(mlrval.FromArray([]*mlrval.Mlrval{
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mlrval.FromInt(1),
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mlrval.FromInt(8),
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}))
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output = BIF_sparkline(input)
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assert.True(t, mlrval.Equals(output, mlrval.FromString("▁█")))
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}
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