feat(plan): add plan command to create build plans

pkg/repository/repository.go

@@ -0,0 +1,91 @@
+package repository
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+)
+
+//nolint:golint
+var (
+	Err       = errors.New("repository")
+	ErrGitHub = fmt.Errorf("%w: github", Err)
+)
+
+const GitHubBaseURL = "https://github.com/"
+
+// Type is a repository type
+type Type string
+
+const GitHub Type = "github"
+
+// Repository represents basic information about a repository with helper
+// methods to get various pieces of information from it.
+type Repository struct {
+	Type   Type   `yaml:"type,omitempty"`
+	Source string `yaml:"source,omitempty"`
+}
+
+func NewGitHub(ownerAndName string) (*Repository, error) {
+	parts := strings.Split(ownerAndName, "/")
+	if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
+		return nil, fmt.Errorf(
+			"%w: repository must be give in \"owner/name\" format",
+			ErrGitHub,
+		)
+	}
+
+	return &Repository{
+		Type:   GitHub,
+		Source: ownerAndName,
+	}, nil
+}
+
+func (s *Repository) Owner() string {
+	switch s.Type {
+	case GitHub:
+		return strings.SplitN(s.Source, "/", 2)[0]
+	default:
+		return ""
+	}
+}
+
+func (s *Repository) Name() string {
+	switch s.Type {
+	case GitHub:
+		return strings.SplitN(s.Source, "/", 2)[1]
+	default:
+		return ""
+	}
+}
+
+func (s *Repository) URL() string {
+	switch s.Type {
+	case GitHub:
+		return GitHubBaseURL + s.Source
+	default:
+		return ""
+	}
+}
+
+func (s *Repository) CloneURL() string {
+	switch s.Type {
+	case GitHub:
+		return GitHubBaseURL + s.Source + ".git"
+	default:
+		return ""
+	}
+}
+
+func (s *Repository) TarballURL(ref string) string {
+	if ref == "" {
+		return ""
+	}
+
+	switch s.Type {
+	case GitHub:
+		return GitHubBaseURL + s.Source + "/tarball/" + ref
+	default:
+		return ""
+	}
+}