+/* Exit status code indicating temporary failure; user is invited to
+ * retry.
+ *
+ * For example, file(s) in the mail store were removed or renamed
+ * after notmuch new scanned the directories but before indexing the
+ * file(s). If the file was renamed, the indexing might not be
+ * complete, and the user is advised to re-run notmuch new.
+ */
+#define NOTMUCH_EXIT_TEMPFAIL EX_TEMPFAIL
+
+/* Exit status code indicating the requested format version is too old
+ * (support for that version has been dropped). CLI code should use
+ * notmuch_exit_if_unsupported_format rather than directly exiting
+ * with this code.
+ */
+#define NOTMUCH_EXIT_FORMAT_TOO_OLD 20
+/* Exit status code indicating the requested format version is newer
+ * than the version supported by the CLI. CLI code should use
+ * notmuch_exit_if_unsupported_format rather than directly exiting
+ * with this code.
+ */
+#define NOTMUCH_EXIT_FORMAT_TOO_NEW 21
+
+/* The current structured output format version. Requests for format
+ * versions above this will return an error. Backwards-incompatible
+ * changes such as removing map fields, changing the meaning of map
+ * fields, or changing the meanings of list elements should increase
+ * this. New (required) map fields can be added without increasing
+ * this.
+ */
+#define NOTMUCH_FORMAT_CUR 4
+/* The minimum supported structured output format version. Requests
+ * for format versions below this will return an error. */
+#define NOTMUCH_FORMAT_MIN 1
+/* The minimum non-deprecated structured output format version.
+ * Requests for format versions below this will print a stern warning.
+ * Must be between NOTMUCH_FORMAT_MIN and NOTMUCH_FORMAT_CUR,
+ * inclusive.
+ */
+#define NOTMUCH_FORMAT_MIN_ACTIVE 1
+
+/* The output format version requested by the caller on the command
+ * line. If no format version is requested, this will be set to
+ * NOTMUCH_FORMAT_CUR. Even though the command-line option is
+ * per-command, this is global because commands can share structured
+ * output code.
+ */
+extern int notmuch_format_version;
+
+typedef struct _notmuch_config notmuch_config_t;
+
+/* Commands that support structured output should support the
+ * following argument
+ * { NOTMUCH_OPT_INT, ¬much_format_version, "format-version", 0, 0 }
+ * and should invoke notmuch_exit_if_unsupported_format to check the
+ * requested version. If notmuch_format_version is outside the
+ * supported range, this will print a detailed diagnostic message for
+ * the user and exit with NOTMUCH_EXIT_FORMAT_TOO_{OLD,NEW} to inform
+ * the invoking program of the problem.
+ */
+void
+notmuch_exit_if_unsupported_format (void);
+
+#if (GMIME_MAJOR_VERSION <3)
+notmuch_crypto_context_t *
+notmuch_crypto_get_context (notmuch_crypto_t *crypto, const char *protocol);
+#endif
+
+int
+notmuch_crypto_cleanup (notmuch_crypto_t *crypto);
+
+int
+notmuch_count_command (notmuch_config_t *config, int argc, char *argv[]);
+
+int
+notmuch_dump_command (notmuch_config_t *config, int argc, char *argv[]);
+