internal/rosa: overridable version check

For projects with strange version practices.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/all.go

@@ -166,6 +166,17 @@ type Metadata struct {
 	//
 	// [Anitya]: https://release-monitoring.org/
 	ID int `json:"-"`
+
+	// Optional custom version checking behaviour.
+	latest func(v *Versions, cur string) bool
+}
+
+// IsLatest returns whether cur is the latest version described by v.
+func (meta *Metadata) IsLatest(v *Versions, cur string) bool {
+	if meta.latest != nil {
+		return meta.latest(v, cur)
+	}
+	return v.Latest == cur
 }
 
 // Unversioned denotes an unversioned [PArtifact].
@@ -188,6 +199,14 @@ type Versions struct {
 	All []string `json:"versions"`
 }
 
+// checkStable returns whether cur is the latest version described by Stable.
+func (v *Versions) checkStable(cur string) bool {
+	if len(v.Stable) == 0 {
+		return v.Latest == cur
+	}
+	return v.Stable[0] == cur
+}
+
 // GetVersions returns versions fetched from Anitya.
 func (meta *Metadata) GetVersions(ctx context.Context) (*Versions, error) {
 	if meta.ID == 0 {