Self-contained, plain Go implementation of calendar heatmap inspired by Github contribution activity.
$ go build
$ echo '{
"2020-05-16": 8,
"2020-05-17": 13,
"2020-05-18": 5,
"2020-05-19": 8,
"2020-05-20": 5
}' | ./calendarheatmap > chart.png
Basic
Colorscales 
UTF-8 
SVG
Without month separator 
Without labels 
Without labels, without separator 
Well, I just followed the install instructions from the readme:
![[BUG] can not open file with colorscales](https://avatars.githubusercontent.com/u/77340376?v=4)
go install github.com/nikolaydubina/calendarheatmap@latest
and then:
cat my_file.json | calendarheatmap > my_heatmap.png
to only receive a fatal error:
2021/07/15 10:58:42 can not open file: open assets/colorscales/green-blue-9.csv: no such file or directory
I wanted to use this to visualize my habit tracking data, and so I needed to specify the maximum possible count manually (instead of it being the max of counts present in input data).
Sample usage:
echo '{
"2020-05-16": 2,
"2020-05-17": 6,
"2020-05-18": 1,
"2020-05-19": 10,
"2020-05-20": 30
}' | calendarheatmap -maxcount 10 > chart.png
I wanted to make the counts be float instead of int, but I had doubts on whether your code assumes that they are ints. floats are more general and usable.
PS: I have also fixed os.Setenv("CALENDAR_HEATMAP_ASSETS_PATH", "charts/assets") with a default value for the actual Getenv.
PPS: Take a look at https://github.com/NightMachinary/calendarheatmap/blob/master/tests2.org for the later commits' effects.
It would be great if we can detect clicks on any given box and get the corresponding date and react to the click. To do that, it'd be great to get the coordinates of each box.
Some folks signaled interest before in making divergent color schemes with something like Excel red - green style. Add support.
Also, may need support negative values in map.
Removed filename argument. Instead pass data using stdin and get data using stdout. This will make script plugable with other utilities like jq. Maybe you can fetch data from Github and render it in single line?
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