But I am progressing.
I've read the area51 discussion and most of the things mentioned there are things I have already stated as potential problems in my extension.
I think I will at first do a first version of the extension without many special cases. I'll add ACP configs for example later.
I also want to give different possibilities for users who want it. The [mention] bbcode for example.
I am currently thinking about a way to deal with names with spaces or @ character. Spaces would be fixed by either use
@"Name with spaces"or
@[Name with spaces].
And then there is the problem what to do with mentions on post edit But I'll deal with that later. At first there will be only mentions on new posts.