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Useful when you have large project with lots of files and packages

New! Now available athttps://go-cover-treemap.io 🎉

$ go install github.com/nikolaydubina/go-cover-treemap@latest$ go test -coverprofile cover.out ./...$ go-cover-treemap -coverprofile cover.out > out.svg

github.com/gohugoio/hugo

..also available in 1080x360

..and even 1080x180

github.com/gin-gonic/gin

github.com/go-chi/chi

github.com/nikolaydubina/treemap

github.com/nikolaydubina/go-featureprocessing

In all examples above I rungo test -coverprofile <my-file> ./....I did not do any special setup.Some projects may require additional steps to properly run test and generate full coverprofile.What you see is "lower bound" of coverage for those projects.All profiles generated onmain branch of each project in GitHub on 2021-12-07.

Welcomed! Add pretty color palettes! Add interesting examples!

• Official Go tool to make HTML from cover profile:https://github.com/golang/go/blob/master/src/cmd/cover/html.go#L97
• Official Go parser of cover profilegolang.org/x/tools/cover:https://github.com/golang/tools/tree/master/cover
• Go SVG Treemap renderer with treemap:https://github.com/nikolaydubina/treemap

You can see that structure and heat changes forgithub.com/gohugoio/hugo.Subtrees that look bad for files no longer look as bad for statements.Lots of red boxes for files become very small and unnoticeable.This can be because they contain non-testable constructs like constants.It is more accurate to use statments, since heat is percentage of covered statements, and we compute heat by weighting sum by sizes of children.In short, you are more likely want to use statements for size.

files

statements

It is common to have root and first few children to have only one child.Each takes margin and wastes space.We can collapse these into longer name, and use that space for visualizing higher depth of boxes.This is particularly useful for narrow dimensions, which makes feasible useful narrow dimension.

1080x360 with root collapsing

1080x360 without root collapse

1080x180 with root collapsing

1080x180 without root collapse

Web UI is maintained in dedicated repository:https://github.com/nikolaydubina/go-cover-treemap-web

This is to isolate web (WASM/JS/HTML) needed dependencies, likesyscall/js from minimal CLI package.

It turns out interactive UI is very helpful. Brower can be utilized as effective input source for:

• changing dimensions of window -> changing dimensions of SVG
• drag and drop file
• slider to increase granularity of treemap

Projects that have lots of files may benefit from not displaying filesbut only folders.This is also useful when you want to see impact of immediate files in folder to overall folder heat.Hierarchical properties of size (sum of sizes of children) and heat (weighted heat of children) are preserved.Immediate children.go files in folder are aggregated into single child*.If there is only one* child, then it is skipped— suggested byherlon214

files

only folders

only folders without aggregation (heat and size property not preserved)

Is is important that everyone can use this tool.Such we are providing color-blind option Red-Blue alternative.— suggested byBr3nda

normal

color-blind

$ cat testdata/treemap.cover| ./go-cover-treemap> docs/go-cover-treemap-stdin.svg$ ./go-cover-treemap -coverprofile testdata/treemap.cover> docs/go-cover-treemap.svg$ ./go-cover-treemap -coverprofile testdata/go-featureprocessing.cover> docs/go-featureprocessing.svg$ ./go-cover-treemap -coverprofile testdata/gin.cover> docs/gin.svg$ ./go-cover-treemap -coverprofile testdata/chi.cover> docs/chi.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover> docs/hugo.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover -w 1080 -h 360> docs/hugo-1080x360.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover -w 1080 -h 180> docs/hugo-1080x180.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover -statements=false> docs/hugo-files.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover -collapse-root=false> docs/hugo-long-root.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover -collapse-root=false -w 1080 -h 360> docs/hugo-long-root-1080x360.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover -collapse-root=false -w 1080 -h 180> docs/hugo-long-root-1080x180.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover -only-folders> docs/hugo-only-folders.svg$ ./go-cover-treemap -coverprofile testdata/hugo.cover --color-blind> docs/hugo-color-blind.svg