Static sync to memory fails with Norwegian "å"

[bep]

• Image with Norwegian character "å", aka "ål.jpg" fails to sync in hugo server
• --renderToDisk works fine, as do regular hugo builds.
• Curious enough, files with "ø" (another special Norwegian character) works fine ...

[ks888]

I think it is normalization problem.

https://blog.golang.org/normalization

As well as é, there are several ways to represent å. In NFC, å is \xc3\xa5. In NFD, it is \x61\xcc\x8a.

NFC is used in most cases, but in Mac OS's HFS+ file system, a file name is automatically normalized to NFD. Even if we save a file name in NFC, we need to use NFD to open the file.

In this issue's case, Hugo server is able to serve ål.jpg file, but we need to use NFD to access it. Since å character in markdown/html file are represented in NFC, we are unable to access ål.jpgfile.

I think this issue can be fixed by normalizing a file name to NFC when files are added to Hugo's filesystem, so that we can use NFC to access files in any cases.

[bep]

@ks888 thanks for this. It would be nice, though, if this fix could be applied to Afero (the VFS in use). I will look into this a little bit later.

/cc @spf13

[ks888]

I understand afero as the abstraction layer of various filesystems, and I wonder if normalizing a file name is out of scope.
But, in practice, it sounds very useful if afero normalizes a file name in NFD to NFC.

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