Change choose codespace prompt

- Repo + branch is favored
- Codespace name is included to disambiguate between two codespaces
- Move Codespace model out of out API into its own package
- Update call sites and group behavior under codespace.Codespace

internal/codespaces/codespace/codespace.go

@@ -0,0 +1,76 @@
+package codespace
+
+import "fmt"
+
+type Codespace struct {
+	Name           string      `json:"name"`
+	CreatedAt      string      `json:"created_at"`
+	LastUsedAt     string      `json:"last_used_at"`
+	GUID           string      `json:"guid"`
+	Branch         string      `json:"branch"`
+	RepositoryName string      `json:"repository_name"`
+	RepositoryNWO  string      `json:"repository_nwo"`
+	OwnerLogin     string      `json:"owner_login"`
+	Environment    Environment `json:"environment"`
+}
+
+// DisplayName returns the repository nwo and branch.
+// If includeName is true, the name of the codespace is included.
+// If includeGitStatus is true, the branch will include a star if
+// the codespace has unsaved changes.
+func (c *Codespace) DisplayName(includeName, includeGitStatus bool) string {
+	branch := c.Branch
+	if includeGitStatus {
+		branch = c.BranchWithGitStatus()
+	}
+
+	if includeName {
+		return fmt.Sprintf(
+			"%s: %s [%s]", c.RepositoryNWO, branch, c.Name,
+		)
+	}
+	return c.RepositoryNWO + ": " + branch
+}
+
+// BranchWithGitStatus returns the branch with a star
+// if the branch is currently being worked on.
+func (c *Codespace) BranchWithGitStatus() string {
+	if c.HasUnsavedChanges() {
+		return c.Branch + "*"
+	}
+
+	return c.Branch
+}
+
+// HasUnsavedChanges returns whether the environment has
+// unsaved changes.
+func (c *Codespace) HasUnsavedChanges() bool {
+	return c.Environment.GitStatus.HasUncommitedChanges || c.Environment.GitStatus.HasUnpushedChanges
+}
+
+type Environment struct {
+	State      string                `json:"state"`
+	Connection EnvironmentConnection `json:"connection"`
+	GitStatus  EnvironmentGitStatus  `json:"gitStatus"`
+}
+
+type EnvironmentGitStatus struct {
+	Ahead                int    `json:"ahead"`
+	Behind               int    `json:"behind"`
+	Branch               string `json:"branch"`
+	Commit               string `json:"commit"`
+	HasUnpushedChanges   bool   `json:"hasUnpushedChanges"`
+	HasUncommitedChanges bool   `json:"hasUncommitedChanges"`
+}
+
+const (
+	EnvironmentStateAvailable = "Available"
+)
+
+type EnvironmentConnection struct {
+	SessionID      string   `json:"sessionId"`
+	SessionToken   string   `json:"sessionToken"`
+	RelayEndpoint  string   `json:"relayEndpoint"`
+	RelaySAS       string   `json:"relaySas"`
+	HostPublicKeys []string `json:"hostPublicKeys"`
+}