Add overridable parameter

# Changes:
- Add options to NewParams method to allow overriding certain parameters. This can benefit other projects to import this CLI as library.

Signed-off-by: Sayan Biswas <sayan-biswas@live.com>

Author: sayan-biswas

pkg/shp/params/params.go

@@ -54,6 +54,8 @@ type Params struct {
 	failPollTimeout  *time.Duration
 }
 
+type Options func(params *Params)
+
 // AddFlags accepts flags and adds program global flags to it
 func (p *Params) AddFlags(flags *pflag.FlagSet) {
 	p.configFlags.AddFlags(flags)
@@ -193,12 +195,39 @@ func (p *Params) NewFollower(
 	return p.follower, nil
 }
 
+// WithClientset Use explicit clientset
+func WithClientset(kubeClientset kubernetes.Interface, buildClientset buildclientset.Interface) Options {
+	return func(p *Params) {
+		p.clientset = kubeClientset
+		p.buildClientset = buildClientset
+	}
+}
+
+// WithConfigFlags Use explicit config flags
+func WithConfigFlags(configFlags *genericclioptions.ConfigFlags) Options {
+	return func(p *Params) {
+		p.configFlags = configFlags
+	}
+}
+
+// WithNamespace Use explicit namespace
+func WithNamespace(namespace string) Options {
+	return func(p *Params) {
+		p.namespace = namespace
+	}
+}
+
 // NewParams creates a new instance of ShipwrightParams and returns it as
 // an interface value
-func NewParams() *Params {
+func NewParams(options ...Options) *Params {
 	p := &Params{}
 	p.configFlags = genericclioptions.NewConfigFlags(true)
 
+	// Apply all provided options
+	for _, option := range options {
+		option(p)
+	}
+
 	return p
 }