Proposal: add ifM and whenM to Control.Monad

[Oliver Charles]

I'm +1 on whenM and unlessM - those I have wanted and think are very
worthwhile. Regardless of the naming convention stuff (which I have never
even been aware of in my day-to-day coding with Haskell), I think these are
the right names, and they also match the naming with monad-loops (`whileM`,
etc). I'd be -1 on mwhen, munless, etc.

I'm +/-0 on ifM, but that doesn't seem to be in the original proposal
anyway. I can see the value in it, but I've never really needed it. I would
probably use f >>= bool x y in practice.

- ocharles


On Mon, Apr 21, 2014 at 7:34 PM, Brandon Allbery <allbery.b at gmail.com>wrote:

> On Mon, Apr 21, 2014 at 2:26 PM, Evan Laforge <qdunkan at gmail.com> wrote:
>
>> On Mon, Apr 21, 2014 at 11:19 AM, Bardur Arantsson <spam at scientician.net>
>> wrote:
>> > On 2014-04-21 17:47, Edward Kmett wrote:
>> >> I, for one, could get behind just taking ifM, whenM, unlessM for these
>> >> operations, proper naming conventions aside.
>> >>
>> >> They've been independently reinvented in 60+ packages with these exact
>> >> names.
>> >>
>> >> If we do this, over time we'll save another 60+ packages the trouble of
>> >> doing the same thing.
>> >
>> > +1 (for the proposal, based on exactly the above summary)
>>
>> +1 from me too, because I have the same functions with these names in
>> my non-cabal packages.
>>
>> There might be a lot of non-cabal whenM etc. out there.
>
>
> And you're still missing a few with more specific type signatures, e.g.
> xmonad's whenX.
>
> --
> brandon s allbery kf8nh                               sine nomine
> associates
> allbery.b at gmail.com
> ballbery at sinenomine.net
> unix, openafs, kerberos, infrastructure, xmonad
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