Message sort order when using maildir as storage.

[cspencer49519]

When using maildir as my storage medium, all messages are sorted ascending, how can I get them to sort descending(most recent first)?

[ian-kent]

That'd be a bug, of sorts. The maildir implementation returns messages in the order they're returned by the file system without any sorting.

Having just looked at the code, its even more basic than that - it returns all messages regardless of the start or limit values passed in.

Adding a sort would be easy, though inefficient for large numbers of messages (not that what's there now could be considered efficient). Start and limit would be a bit tougher, so maildir might only ever be useful for capturing message data rather than accessing it from the API or web UI.

[staabm]

we also experience this problem with the maildir-based storage

[koshatul]

Just something as simple as:

	sort.Slice(n, func(i, j int) bool {
		return !n[i].ModTime().Before(n[j].ModTime())
	})

	if start < 0 {
		start = 0
	}

	if len(n) < start+limit {
		limit = len(n) - start
	}

	if len(n) > start && start > 0 {
		n = n[start:]
	}

	if len(n) > limit {
		n = n[:limit]
	}

in the storage/maildir.go would add date sorting by default and start/limit support, the overhead isn't that much more than what it currently has.