All good thoughts, but hold the phone.

I think I have a mishmash a lot of old deprecated info plist keys and outright 
misapprehensions in my Info.plist, especially under CFBundleDocumentTypes and 
UTExportedTypeDeclarations. I think the file extension swapping will behave 
correctly once I've gotten it fixed. I will post an update tomorrow.

I don't think your number 2 will be workable, since we're sandboxed/PowerBoxed 
here. If the NSSavePanel gives me a security scoped URL to a give file system 
path, I may not be able to write to a variant of that path.

-Tom

On Jan 17, 2013, at 4:57 PM, Quincey Morris 
<quinceymor...@rivergatesoftware.com> wrote:

> On Jan 17, 2013, at 16:20 , Thomas Bunch <t...@omnigroup.com> wrote:
> 
>> Yes, in fact, I do exactly this. It's kind of suboptimal, in that 
>> NSSavePanel will first give you a warning:
>> 
>> 
>> “Foo.oplx” already exists. Do you want to replace it?” and so on… the user 
>> will probably reflexively accept that one.
>> 
>> Then we check and see that you're asking to dump a folder of web stuff, that 
>> the folder exists, that its contents don't look like a bucket of HTML and we 
>> pop up a second “That seems like a really bad idea, really really blow that 
>> away?” sheet.
> 
> Working backwards, it seems to me you really, really want to retain this last 
> behavior in any situation where you're writing a folder to replace a folder. 
> Even if the extensions behaved the way they should, you could easily get a 
> situation where the user selected an entirely unrelated folder, and 
> "reflexively" accepted the warning about that replacement.
> 
> If that's so, the extension behavior is somewhat a red herring. When you're 
> exporting multiple types via a single dialog, writing one of the types on top 
> of one of the other types is probably something you should always check for.
> 
> A couple of other thoughts:
> 
> 1. Is there any value in configuring your save panel to hide the "show/hide 
> extension" checkbox, and to always display extensions. That will, 
> incidentally, ensure that the saved item will show its extension in the 
> Finder, regardless of what the user normally does. You could then go ahead 
> and use '.htmld' without ever misleading the user that it wasn't there.
> 
> 2. You could probably arrange to keep the "htmld" behavior in the dialog, and 
> rename the folder to remove the "htmld" at the end of the save. (You'd have 
> to use a NSDocument "perform…" method to ensure you re-set the document's 
> fileURL at the right time afterwards.) The drawback, of course, is that the 
> un-extensioned folder may already exist, and you don't know what the user 
> wants you to do about that. You *might* be able to mitigate that problem via 
> the save panel delegate's validate method.
> 
> 3. Is there any value in the idea of exporting folders of stuff (that is, 
> exporting things that don't have a unique UTI) via a separate menu item that 
> doesn't involve choosing a type in its save panel?
> 

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