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proposal: cmd/cover: add flag to print total coverage number #47398

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matrixik opened this issue Jul 26, 2021 · 7 comments
Closed

proposal: cmd/cover: add flag to print total coverage number #47398

matrixik opened this issue Jul 26, 2021 · 7 comments
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@matrixik
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@matrixik matrixik commented Jul 26, 2021

I would like cover tool to have flag outputing total coverage that could be then later used in some custom scripts (like in CI).

Example:

λ go tool cover -func=coverage.out
slug/slug.go:43:		fooA		100.0%
slug/slug.go:49:		fooB		100.0%
slug/slug.go:106:		fooC		100.0%
total:				(statements)	100.0%

# now in script (could break if output format change)
λ go tool cover -func=coverage.out | grep total | grep -Eo '[0-9]+\.[0-9]+'
100.0

# some flag idea
λ go tool cover -total-number -func=coverage.out
100.0
$ go version
go version go1.16.6 linux/amd64
λ go tool cover -V
cover version go1.16.6
@gopherbot gopherbot added this to the Proposal milestone Jul 26, 2021
@carlmjohnson
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@carlmjohnson carlmjohnson commented Jul 26, 2021

ISTM, a -json flag would be more general and useful.

@ianlancetaylor ianlancetaylor added this to Incoming in Proposals Jul 28, 2021
@bcmills
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@bcmills bcmills commented Aug 3, 2021

See previously #16888.

@rsc rsc moved this from Incoming to Active in Proposals Aug 4, 2021
@rsc
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@rsc rsc commented Aug 4, 2021

This proposal has been added to the active column of the proposals project
and will now be reviewed at the weekly proposal review meetings.
— rsc for the proposal review group

@matrixik
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@matrixik matrixik commented Aug 4, 2021

See previously #16888.

#16888 wanted to change existing output (reason for abandonment), here I'm asking about new and always stable output.

@rsc
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@rsc rsc commented Aug 11, 2021

I think at this point we are happy to say that the output format of go tool cover -func=coverage.out is not going to change.
That seems like a better solution than a separate flag that prints a single number.
(Printing the single number puts too much emphasis on that one metric.)

@rsc
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@rsc rsc commented Aug 18, 2021

Based on the discussion above, this proposal seems like a likely decline.
— rsc for the proposal review group

@rsc rsc moved this from Active to Likely Decline in Proposals Aug 18, 2021
@rsc rsc moved this from Likely Decline to Declined in Proposals Aug 25, 2021
@rsc
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@rsc rsc commented Aug 25, 2021

No change in consensus, so declined.
— rsc for the proposal review group

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