Add -Wswitch-enum and fix warnings.

Having to enumerate all the enum values at every switch is annoying,
but this warning actually found a bug, (missing support for
NOTMUCH_STATUS_OUT_OF_MEMORY in notmuch_status_to_string).

Makefile

@@ -1,6 +1,7 @@
 PROGS=notmuch
 
-CXXWARNINGS_FLAGS=-Wall -Wextra -Wmissing-declarations -Wwrite-strings
+CXXWARNINGS_FLAGS=-Wall -Wextra -Wmissing-declarations -Wwrite-strings \
+-Wswitch-enum
 CWARNINGS_FLAGS=$(CXXWARNINGS_FLAGS)
 
 CDEPENDS_FLAGS=`pkg-config --cflags glib-2.0 talloc`

database.cc

@@ -152,6 +152,8 @@ notmuch_status_to_string (notmuch_status_t status)
     switch (status) {
     case NOTMUCH_STATUS_SUCCESS:
 	return "No error occurred";
+    case NOTMUCH_STATUS_OUT_OF_MEMORY:
+	return "Out of memory";
     case NOTMUCH_STATUS_XAPIAN_EXCEPTION:
 	return "A Xapian exception occurred";
     case NOTMUCH_STATUS_FILE_ERROR:

notmuch.c

@@ -267,10 +267,16 @@ add_files_recursive (notmuch_database_t *notmuch,
 			break;
 		    /* Fatal issues. Don't process anymore. */
 		    case NOTMUCH_STATUS_XAPIAN_EXCEPTION:
-			fprintf (stderr, "A Xapian error was encountered. Halting processing.\n");
+		    case NOTMUCH_STATUS_OUT_OF_MEMORY:
+			fprintf (stderr, "Error: %s. Halting processing.\n",
+				 notmuch_status_to_string (status));
 			ret = status;
 			goto DONE;
 		    default:
+		    case NOTMUCH_STATUS_FILE_ERROR:
+		    case NOTMUCH_STATUS_NULL_POINTER:
+		    case NOTMUCH_STATUS_TAG_TOO_LONG:
+		    case NOTMUCH_STATUS_LAST_STATUS:
 			INTERNAL_ERROR ("add_message returned unexpected value: %d",  status);
 			goto DONE;
 		}