1 files changed, 71 insertions, 0 deletions
diff --git a/internal/config/yaml.go b/internal/config/yaml.go
new file mode 100644
index 0000000..335dede
--- /dev/null
+++ b/internal/config/yaml.go
@@ -0,0 +1,71 @@
+package config
+
+import "fmt"
+
+type Group struct {
+	Group string
+	Feeds []configGroupFeed
+}
+
+type configGroupFeed struct {
+	Target *string
+	Feed   `yaml:",inline"`
+	Group  `yaml:",inline"`
+}
+
+func (grpFeed *configGroupFeed) isGroup() bool {
+	return grpFeed.Group.Group != ""
+}
+
+func (grpFeed *configGroupFeed) isFeed() bool {
+	return grpFeed.Name != ""
+}
+
+func (grpFeed *configGroupFeed) target() string {
+	if grpFeed.Target != nil {
+		return *grpFeed.Target
+	}
+	if grpFeed.Name != "" {
+		return grpFeed.Name
+	}
+
+	return grpFeed.Group.Group
+}
+
+func appTarget(target, app string) string {
+	if target == "" {
+		return app
+	}
+
+	if app == "" {
+		return target
+	}
+
+	return target + "/" + app
+}
+
+// Parse the group structure and populate the `Target` fields in the feeds
+func buildFeeds(cfg []configGroupFeed, target string, feeds Feeds) error {
+	for _, f := range cfg {
+		target := appTarget(target, f.target())
+		switch {
+		case f.isFeed() && f.isGroup():
+			return fmt.Errorf("Entry with Target %s is both a Feed and a group", target)
+
+		case f.isFeed():
+			name := f.Feed.Name
+			if _, ok := feeds[name]; !ok {
+				return fmt.Errorf("Duplicate Feed Name '%s'", name)
+			}
+			f.Feed.Target = target
+			feeds[name] = &f.Feed
+
+		case f.isGroup():
+			if err := buildFeeds(f.Group.Feeds, target, feeds); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}