feat: goauth: add ParseOptions(), Options.NewClient()

cli.go

@@ -1,18 +1,40 @@
 package goauth
 
-// Options is a struct to be used with `github.com/jessevdk/go-flags`.
-// It can be embedded in another struct.
+import (
+	"context"
+	"net/http"
+
+	"github.com/grokify/mogo/errors/errorsutil"
+	"github.com/jessevdk/go-flags"
+)
+
+// Options is a struct to be used with `ParseOptions()` or `github.com/jessevdk/go-flags`.
+// It can be embedded in another struct and used directly with `github.com/jessevdk/go-flags`.
 type Options struct {
 	CredsPath string `long:"creds" description:"Environment File Path" required:"true"`
 	Account   string `long:"account" description:"Environment Variable Name"`
 	Token     string `long:"token" description:"Token"`
 	CLI       []bool `long:"cli" description:"CLI"`
 }
 
+func ParseOptions() (*Options, error) {
+	opts := &Options{}
+	_, err := flags.Parse(opts)
+	return opts, err
+}
+
 func (opts *Options) Credentials() (Credentials, error) {
 	return ReadFileCredentialsFromCredentialsSet(opts.CredsPath, opts.Account)
 }
 
+func (opts *Options) NewClient(ctx context.Context) (*http.Client, error) {
+	if creds, err := opts.Credentials(); err != nil {
+		return nil, errorsutil.Wrap(err, "error in `goauth.Options.NewClient() call to self as `goauth.Options.Credentials()`")
+	} else {
+		return creds.NewClient(ctx)
+	}
+}
+
 func (opts *Options) UseCLI() bool {
 	return len(opts.CLI) > 0
 }