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proposal: cmd/generate: Be able to run directives that *don't* match a specified expression #38687

xtonyjiang opened this issue Apr 27, 2020 · 0 comments


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@xtonyjiang xtonyjiang commented Apr 27, 2020

We currently have the -run flag, but I believe it is currently impossible to supply a regular expression that would allow for excluding a certain expression (due to no lookaheads in Go's regex syntax). Being able to exclude expressions would be useful if we want to exclude certain directives that are time-consuming and are not needed in the moment, and we want to run a large amount of other directives, so that it would be impractical to simply run go generate multiple times with different -run flags.

I think one way to implement this could be an additional flag. Similar to grep's --invert-match flag, we could do something like:

go generate -invertmatch -run="my excluded pattern" ./...

Alternatively, we could also have a different flag that is used instead of -run, like:

go generate -runexcept="my excluded pattern" ./...

Here, supplying both -runexcept and -run would be invalid.

@gopherbot gopherbot added this to the Proposal milestone Apr 27, 2020
@ianlancetaylor ianlancetaylor added this to Incoming in Proposals Jan 6, 2021
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