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[](https://goreportcard.com/report/github.com/nikolaydubina/calendarheatmap)
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[](https://pkg.go.dev/github.com/nikolaydubina/calendarheatmap/charts)
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[](https://codecov.io/gh/nikolaydubina/calendarheatmap)
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[](https://github.com/nikolaydubina/calendarheatmap/actions)
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[](https://github.com/avelino/awesome-go#science -and-data-analysis)
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Self-contained, plain Go implementation of calendar heatmap inspired by GitHub contribution activity available via CLI and [calendarheatmap.io ](https://calendarheatmap.io )
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```
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$ go install github.com/nikolaydubina/calendarheatmap@latest
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$ echo '{
"2020-05-16": 8,
"2020-05-17": 13,
"2020-05-18": 5,
"2020-05-19": 8,
"2020-05-20": 5
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}' | calendarheatmap > chart.png
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```
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Basic
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Colorscales
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UTF-8
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SVG
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Without month separator
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Without labels
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Without labels, without separator
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## GitHub stars over time
[](https://starchart.cc/nikolaydubina/calendarheatmap)
