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package data
import (
"context"
"io"
"io/ioutil"
"os"
"github.com/pkg/errors"
)
func readStdin(ctx context.Context, source *Source, args ...string) ([]byte, error) {
stdin := stdinFromContext(ctx)
b, err := ioutil.ReadAll(stdin)
if err != nil {
return nil, errors.Wrapf(err, "Can't read %s", stdin)
}
return b, nil
}
type stdinCtxKey struct{}
func ContextWithStdin(ctx context.Context, r io.Reader) context.Context {
return context.WithValue(ctx, stdinCtxKey{}, r)
}
func stdinFromContext(ctx context.Context) io.Reader {
if r, ok := ctx.Value(stdinCtxKey{}).(io.Reader); ok {
return r
}
return os.Stdin
}
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