secret version list no longer shows a version without NOT_AFTER as expired (closes #150)

STATUS was `expired` for every version other than the current one, so after
a promote the newest version, which has no NOT_AFTER, read `expired`. STATUS
is now `current` for the current version, `expired` for another version
whose NOT_AFTER has passed, and `inactive` for any other version. README
describes the three.

Judgement call: the issue left the third word to the owner; `inactive` is
the word the plan comment on the issue chose.

Model: opus-5-5

README.md

@@ -193,6 +193,12 @@ Moves or renames a secret within the current vault.
 Lists all versions of a secret showing creation time, status, and validity
 period.
 
+STATUS is `current` for the secret's current version, `expired` for another
+version whose NOT_AFTER has passed, and `inactive` for any other version. Adding
+a version sets NOT_AFTER on the version that was current;
+`secret version promote` sets no times, so after promoting an older version the
+newest version shows `inactive`.
+
 #### `secret version promote <secret-name> <version>`
 
 Promotes a specific version to current by rewriting the secret's `current` file

internal/cli/version.go

@@ -229,9 +229,13 @@ func printVersionRow(
 	}
 
 	// Determine status
-	status := "expired"
+	status := "inactive"
-	if version == currentVersion {
+
+	switch {
+	case version == currentVersion:
 		status = "current"
+	case sv.Metadata.NotAfter != nil && sv.Metadata.NotAfter.Before(time.Now()):
+		status = "expired"
 	}
 
 	// Format timestamps

internal/cli/version_test.go

@@ -5,6 +5,8 @@
 // - TestListVersionsCommand: Tests `secret version list` command output
 // - TestListVersionsNonExistentSecret: Tests error handling for missing secrets
 // - TestPromoteVersionCommand: Tests `secret version promote` command
+// - TestListVersionsStatusAfterPromote: Tests each version's status after
+//   promoting an older version
 // - TestPromoteNonExistentVersion: Tests error handling for invalid promotion
 // - TestGetSecretWithVersion: Tests `secret get --version` flag functionality
 // - TestGetSecretWritesBinaryValue: Tests `secret get` output of binary values
@@ -242,6 +244,66 @@ func TestPromoteVersionCommand(t *testing.T) {
 	assert.Equal(t, []byte("version-1"), promoted.Bytes())
 }
 
+func TestListVersionsStatusAfterPromote(t *testing.T) {
+	t.Parallel()
+
+	fs := afero.NewMemMapFs()
+	cli := NewCLIInstanceWithStateDir(fs, testStateDir)
+	cli.Mnemonic = testMnemonicBuffer(t)
+
+	setupTestVault(t, fs)
+
+	vlt, err := vault.GetCurrentVault(fs, testStateDir)
+	require.NoError(t, err)
+
+	vlt.Mnemonic = cli.Mnemonic
+
+	addTestSecret(t, vlt, []byte("version-1"), false)
+	addTestSecret(t, vlt, []byte("version-2"), true)
+	addTestSecret(t, vlt, []byte("version-3"), true)
+
+	vaultDir, err := vlt.GetDirectory()
+	require.NoError(t, err)
+
+	// Newest first
+	versions, err := secret.ListVersions(fs,
+		filepath.Join(vaultDir, "secrets.d", "test%secret"))
+	require.NoError(t, err)
+	require.Len(t, versions, 3)
+
+	newest, middle, oldest := versions[0], versions[1], versions[2]
+
+	cmd := newRootCmd()
+
+	var buf bytes.Buffer
+	cmd.SetOut(&buf)
+	cmd.SetErr(&buf)
+
+	err = cli.PromoteVersion(cmd, "test/secret", oldest)
+	require.NoError(t, err)
+
+	buf.Reset()
+
+	err = cli.ListVersions(cmd, "test/secret")
+	require.NoError(t, err)
+
+	// STATUS is the fourth field of a row, since CREATED is a date and a time
+	statuses := map[string]string{}
+
+	for line := range strings.SplitSeq(buf.String(), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) > 3 {
+			statuses[fields[0]] = fields[3]
+		}
+	}
+
+	assert.Equal(t, "current", statuses[oldest])
+	// Its NOT_AFTER was set when the newest version was added
+	assert.Equal(t, "expired", statuses[middle])
+	// It has no NOT_AFTER
+	assert.Equal(t, "inactive", statuses[newest])
+}
+
 func TestPromoteNonExistentVersion(t *testing.T) {
 	t.Parallel()