So basically, we have two choices[1]: * Allow *only* tabs or *only* spaces. * Disallow tabs entirely. Out of curiosity, is any actually using tabs in Hamlet/Cassius? I'm leaning towards the second option if only because it's incredibly simple to implement. Michael [1] In case anyone's worried, this discussion is only relevant for the first whitespace characters on the line, otherwise I don't see any reason to care about tab versus spaces. On Fri, Jun 3, 2011 at 3:56 PM, Greg Weber wrote:

I think the 1 tab = X spaces rule is bad: it implies a mixing of tabs and spaces, which only leads to problems. Ideally one could choose between using either 1 tab or the same multiple of spaces, but never mix the two.

On Fri, Jun 3, 2011 at 5:37 AM, Aristid Breitkreuz wrote:

...

Ban tabs.

Am 03.06.2011 13:58 schrieb "Michael Snoyman" :

...

I don't have a strong opinion on tabs/spaces for Hamlet and Cassius (the discussion isn't relevant for Julius or Lucius). So I thought I'd just throw this to the web-devel list: what do you guys think?

Currently, 1 tab = 4 spaces for indentation purposes. I personally never use hard tabs for Haskell, so the question doesn't affect me.

Michael

---------- Forwarded message ---------- From: Shimuuar Date: Wed, Jun 1, 2011 at 7:33 PM Subject: Re: [hamlet] Clearer error for mixed spaces / tabs nesting in cassius (#2) To: michael@snoyman.com

I'd vote to ban tabs. They may change meaning of program silently. If your editor and hamlet/cassius have different tab width it may lead either to error or it could be parsed not as you expected. Second case is real. I encountered it.

IMHO mixing tabs and significant indentation is generally bad idea™

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