wire: specify output file to generator

[myyk]

I would like to be able to generate wire files to something not called wire_gen.go. In my code base the convention for generated files is z_foo.go, so being able to specify the name would give me flexibility without extra commands to move the file after generation each time.

If the generator could be run with an extra argument like -o z_wire.go which would put the file in the same directory as the input wire.go that would work for me.

Other alternatives may be to use something like a --prefix "z_" argument.

[shantuo]

Thanks @myyk for the feature request! This is definitely useful. However, -o might not be feasible if wire is generating more than one files (when there is injector in the test files). --prefix might be the way to go.

[vangent]

Fixed with PR #213, thanks for the contribution! Use --output_file_prefix.