Add HTML5 escape sequence for '

[sc68cal]

This is based off a bug report and discussion in the mastodon plugin for Bitlbee, where mastodon sends ' for single quotes in toots.

[sc68cal]

Looks like this needs some work, since it's turning ' into '#39;

[jelmer]

It would probably make sense to support numbered entities across the board, rather than specifically #39.

[sc68cal]

@jelmer I'm fine with adding numbered entities, but I'd like some feedback on structure. Do I just add more entries to ent and keep the structure as is? Or are you thinking that the htmlentity struct needs changing, to hold the numeric representation?

typedef struct htmlentity {
	char code[7];
	char is[3];
	char numeric[7];
} htmlentity_t;

[sc68cal]

Ah, the numbers for the numeric representation map directly to their ASCII values, so maybe capture the whole string that represents the number, atoi it then back to char ?

[sc68cal]

I think for now i'll just add more to the list, rather than make large changes. Let me know if this is sufficient

[jelmer]

Hmm. I think I've just changed my mind here. Supporting arbitrary numbers opens us up to a whole can of worms (do we allow you to insert � ?).

Maybe we can just support ' for now, and reevaluate if we end up with a long list of numbered entities here. (also, perhaps there's a library we're already depending on that has this functionality?)

[sc68cal]

That works for me.