internal/rosa: overridable version check

For projects with strange versioning practices.

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

cmd/mbf/main.go

@@ -173,9 +173,11 @@ func main() {
 
 			if v, err := meta.GetVersions(ctx); err != nil {
 				return err
-			} else if current := rosa.Std.Version(p); v.Latest != current {
+			} else if current, latest :=
+				rosa.Std.Version(p),
+				meta.GetLatest(v); current != latest {
 				n++
-				log.Printf("%s %s < %s", meta.Name, current, v.Latest)
+				log.Printf("%s %s < %s", meta.Name, current, latest)
 			} else {
 				msg.Verbosef("%s is up to date", meta.Name)
 			}

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) string
+}
+
+// GetLatest returns the latest version described by v.
+func (meta *Metadata) GetLatest(v *Versions) string {
+	if meta.latest != nil {
+		return meta.latest(v)
+	}
+	return v.Latest
 }
 
 // Unversioned denotes an unversioned [PArtifact].
@@ -188,6 +199,14 @@ type Versions struct {
 	All []string `json:"versions"`
 }
 
+// getStable returns the first Stable version, or Latest if that is unavailable.
+func (v *Versions) getStable() string {
+	if len(v.Stable) == 0 {
+		return v.Latest
+	}
+	return v.Stable[0]
+}
+
 // GetVersions returns versions fetched from Anitya.
 func (meta *Metadata) GetVersions(ctx context.Context) (*Versions, error) {
 	if meta.ID == 0 {