fix(versioning): wrong next version if repo only has prereleases

versioning.go

@@ -24,7 +24,12 @@ func (r Releases) NextVersion(versionBump conventionalcommits.VersionBump, nextV
 		return "", fmt.Errorf("failed to parse stable version: %w", err)
 	}
 
-	next := stable // Copy all fields
+	// If there is a previous stable release, we use that as the version anchor. Falling back to any pre-releases
+	// if they are the only tags in the repo.
+	next := latest
+	if r.Stable != nil {
+		next = stable
+	}
 
 	switch versionBump {
 	case conventionalcommits.UnknownVersion:

versioning_test.go

@@ -246,6 +246,48 @@ func TestReleases_NextVersion(t *testing.T) {
 			want:    "v0.0.1",
 			wantErr: assert.NoError,
 		},
+		{
+			name: "nil stable release (major)",
+			releases: Releases{
+				Latest: &Tag{Name: "v1.1.1-rc.0"},
+				Stable: nil,
+			},
+			args: args{
+				versionBump:     conventionalcommits.MajorVersion,
+				nextVersionType: NextVersionTypeUndefined,
+			},
+			want:    "v2.0.0",
+			wantErr: assert.NoError,
+		},
+		{
+			name: "nil stable release (minor)",
+			releases: Releases{
+				Latest: &Tag{Name: "v1.1.1-rc.0"},
+				Stable: nil,
+			},
+			args: args{
+
+				versionBump:     conventionalcommits.MinorVersion,
+				nextVersionType: NextVersionTypeUndefined,
+			},
+			want:    "v1.2.0",
+			wantErr: assert.NoError,
+		},
+		{
+			name: "nil stable release (patch)",
+			releases: Releases{
+				Latest: &Tag{Name: "v1.1.1-rc.0"},
+				Stable: nil,
+			},
+			args: args{
+
+				versionBump:     conventionalcommits.PatchVersion,
+				nextVersionType: NextVersionTypeUndefined,
+			},
+			// TODO: Is this actually correct our should it be v1.1.1?
+			want:    "v1.1.2",
+			wantErr: assert.NoError,
+		},
 		{
 			name: "error on invalid tag semver",
 			releases: Releases{