Generate code with specified build tag

[nicholascapo]

At $day_job we use mocks for integration testing, which means that the mock needs to be exported but we don't want them to be used in production code.

For our manually written code we add a build constraint (build tag):

//go:build !release

package example

During development we can run a normal go test ./..., but for production we build with go build --tags=release, which excludes this code.

We would like to do the same thing for our moq generated mocks:

package example 

//go:generate moq --tags !release --out moq.go . Example
type Example interface {

[sudo-suhas]

suggestion: From what I understand, we only support specifying a single build tag. If that is correct, should we rename the command line flag?

[nicholascapo]

Actually you could pass as many as you want (it's just a string).
I chose this name to match what the go build command has (although that is setting the tag rather than checking it).

This is valid:

moq -tags '(linux && 386) || (darwin && !cgo)' ...

and should result in:

//go:build (linux && 386) || (darwin && !cgo)

package example