Use ListOptions for parameters instead of functional options

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

reddit.go

@@ -360,6 +360,68 @@ type ListOptions struct {
 	Before string `url:"before,omitempty"`
 }
 
+// Value returns the value stored in the pointer.
+func (o *ListOptions) Value() ListOptions {
+	if o == nil {
+		return ListOptions{}
+	}
+	return *o
+}
+
+// GetLimit returns the limit option.
+func (o *ListOptions) GetLimit() int {
+	if o == nil {
+		return 0
+	}
+	return o.Limit
+}
+
+// GetAfter returns the after option.
+func (o *ListOptions) GetAfter() string {
+	if o == nil {
+		return ""
+	}
+	return o.After
+}
+
+// GetBefore returns the before option.
+func (o *ListOptions) GetBefore() string {
+	if o == nil {
+		return ""
+	}
+	return o.Before
+}
+
+// ListSubredditOptions defines possible options used when searching for subreddits.
+type ListSubredditOptions struct {
+	ListOptions
+	// One of: relevance, activity.
+	Sort string `url:"sort,omitempty"`
+}
+
+// ListPostOptions defines possible options used when getting posts from a subreddit.
+type ListPostOptions struct {
+	ListOptions
+	// One of: hour, day, week, month, year, all.
+	Time string `url:"t,omitempty"`
+}
+
+// ListPostSearchOptions defines possible options used when searching for posts within a subreddit.
+type ListPostSearchOptions struct {
+	ListPostOptions
+	// One of: relevance, hot, top, new, comments.
+	Sort string `url:"sort,omitempty"`
+}
+
+// ListUserOverviewOptions defines possible options used when getting a user's post and/or comments.
+type ListUserOverviewOptions struct {
+	ListOptions
+	// One of: hot, new, top, controversial.
+	Sort string `url:"sort,omitempty"`
+	// One of: hour, day, week, month, year, all.
+	Time string `url:"t,omitempty"`
+}
+
 func addOptions(s string, opt interface{}) (string, error) {
 	v := reflect.ValueOf(opt)
 	if v.Kind() == reflect.Ptr && v.IsNil() {