Re: Normalising file names on macOS
Re: Normalising file names on macOS
- Subject: Re: Normalising file names on macOS
- From: John Brownie <email@hidden>
- Date: Thu, 22 Sep 2016 15:15:13 +0300
Thanks, that sounds like a couple of good options. I'll try some options
with the second one, and fall back on the first if necessary.
Alastair Houghton wrote:
My recommendation would be as follows:
1. If possible, don’t base the filename on the user’s input. Instead, generate your own filename (one option might be to use a UUID) and then store a dictionary mapping the user’s input to the filename somewhere in your bundle. This avoids any problems with filename encoding completely. You will still have to worry about normalising the user’s input, but that’s then just a matter of choosing a normalisation.
2. If you must base the filename on user input, do so by stripping out non-ASCII characters and replacing them with e.g. ‘_’s. You’ll also need to make sure that the result is unique, otherwise a user might specify two names that both map to the same ASCIIfied name. You’ll still want to store the dictionary mapping the user’s input.
The benefit of the second approach is that your bundle is more easily understood by a human being. The downside is that it’s more complicated to implement.
Both will work, whatever the filesystem is, as they don’t rely on filesystem encoding behaviour.
(You might also then ponder whether you want things to be case-sensitive or not; the above will be. Making it not case-sensitive is a little tricky in that just converting to upper or lower case doesn’t*quite* work; the correct approach would be to use CFStringFold() to case-fold the string,*after* normalising, before using it as a dictionary key.)
John
--
John Brownie
In Finland on furlough from SIL Papua New Guinea
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