IIRC you need to update go tool dist to tell it that flag depends on math/big;
see src/cmd/dist/deps.go
But if you only need math.Big flags for one project then one thing you could do
is implement a wrapper type of sorts that implements flag.Value. For example,
type BigIntFlag {
big.Int // an embed
}
// big.Int already implements String(); let the embed pass it up
func (b *BigIntFlag) Set(s string) error {
_, ok := b.SetString(s, 10) // or 0, 2, 8, 16
if !ok {
return fmt.Errorf("%q is not a big.Int", s)
}
return nil
}
And then you can just use flag.Var() and/or flag.FlagSet.Var() to add a flag
that understands that type.
(I don't know if the above implementation is perfect.)
> On Oct 15, 2016, at 12:12 AM, Michael Jones <michael.jo...@gmail.com> wrote:
>
> I added an experimental feature to the Flags package in my Go source tree,
> and now when I attempt to build the sequencing of the packages is not
> reflecting the new dependency and the build fails mid-stream with:
>
> Users/mtj/go/src/flag/flag.go:70: can't find import: "math/big"
> go tool dist: FAILED: /Users/mtj/go/pkg/tool/darwin_amd64/compile -pack -o
> /var/folders/6w/y_5pxjsx4h1dhpyrlgq70qt80000gn/T/go-tool-dist-196452509/flag/_go_.a
> -p flag /Users/mtj/go/src/flag/flag.go: exit status 2
> :
>
> What do I need to update to make this work? Advice most welcome.
>
> Michael
>
> P.S. Why? Added big.Int, big.Rat, and big.Float to the types that Flags
> understands…something I need and that seems generally useful.
>
>
>
>
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