[racket] a problem with image.rkt teachpack

Okay, I've pushed this change to our git repository and it is available to
be tried out in our snapshot builds (this doesn't affect 5.3.6 and will
affect, at earliest our next release in a few months):

  http://plt.eecs.northwestern.edu/snapshots/
  http://www.cs.utah.edu/plt/snapshots/

Choose a line labelled "Racket" (not Minimal Racket) and then one with your
platform to give this a try. You should be able to install it without
disrupting your other installations of Racket.

In addition to what was suggested in the screenshot, there is a button that
offers to remove the conflicting teachpack when adding a new one, so
hopefully no one will fall into the bad error message trap going forward.

If you get a chance to try it out, feedback would be welcome.

Robby



On Sun, Sep 8, 2013 at 7:52 PM, Elena Machkasova <elenam at morris.umn.edu>wrote:

>  This would alleviate the confusion, thank you! But I agree that now is
> an awkward time to push the change: many schools are just starting their
> semester, and a change at this point may make some notes obsolete right at
> the beginning of the semester.
>
> My students should be ok at this point: we have sorted out the confusion
> already, so no need for an upgrade on our behalf (but we will get it once
> it becomes available).
>
> Thanks!
>
> Elena
>
>
> On 9/8/2013 7:32 PM, Robby Findler wrote:
>
> Okay, I've made a first attempt on two changes aimed at fixing these
> problems.
>
>  1) change the "image.rkt" to "htdp/image.rkt" and "2htdp/image.rkt" so
> there are no names that are exactly the same
>
>  2) have the teachpack dialog be sensitive to the already installed
> teachpacks and give a warning when a new one would conflict with an old.
>
>  Here's a screenshot:
>
>    http://oi40.tinypic.com/v4b9l4.jpg
>
>  showing what I imagine happening when you click on the 2htdp/image.rkt
> teachpack when you have the htdp/image.rkt one already installed.
>
>  (I would have pushed this already, but there are a few GUI niceties that
> I want to do before pushing.)
>
>  I'm slightly worried about 1) because there may be course notes out
> there that tell people "choose the image.rkt teachpack in the left column"
> that would have to be changed and thus would annoy instructors. Your
> opinions on this point welcome.
>
>  Robby
>
>
>
> On Sun, Sep 8, 2013 at 2:34 PM, Elena Machkasova <elenam at morris.umn.edu>wrote:
>
>>  Thanks, Robby and Marco!
>>
>> Yes, such things may be difficult to change - that's totally
>> understandable! I think a significant part of the confusion is that these
>> teachpacks are listed under "Pre-installed" which seems to mean that they
>> are already there when DrRacket is installed, and that there are two
>> teachpacks with the same name. Perhaps using wording other than
>> "pre-installed" and renaming one of the taechpacks (if possible; I know
>> that sometimes there are dependencies that make it very difficult) would
>> help.
>>
>> I posted a detailed clarification for my students, and hopefully they are
>> all set.
>>
>> And I generally don't ask them to remove teachpacks either, but once
>> they've added the wrong one (and many of them added both), it's easier at
>> this point to just clear all and add it again than to make sure that they
>> remove the one they should.
>>
>> Thanks!
>>
>> Elena
>>
>>
>> On 9/6/2013 9:49 PM, Robby Findler wrote:
>>
>> Unfortunately, this is the way things work. Those are actually two
>> different teachpacks and the error message that you are getting is a poorly
>> worded "these two teachpacks conflict with each other".
>>
>>  Is there perhaps some other behavior you'd prefer?
>>
>>  And, I should also point that even if we do find some fix, there is
>> little chance that our release schedule can be adjusted to respond to your
>> lab installation schedule, I'm sorry to say.
>>
>>  Robby
>>
>>
>> On Fri, Sep 6, 2013 at 9:29 PM, Elena Machkasova <elenam at morris.umn.edu>wrote:
>>
>>> Good evening,
>>>
>>> this may've come up before, but I looked through the last few messages
>>> and did a bit of searching, and couldn't find anything about this problem.
>>> My apologies if this is already a known issue.
>>>
>>> When DrRacket is installed, it comes with 3 pre-installed teachpacks,
>>> including image.rkt. However, image functions (rotate, square, etc) are
>>> undefined. Installing the teachpack from the middle column in the "add
>>> teachpack" list fixes the issue.
>>>
>>> However, if the user then tries to add the teachpack and happens to
>>> click on it in the first column, they get an error message "module:
>>> identifier already imported from a different source". The solution that
>>> seems to work then is to clear both teachpacks and then install the one in
>>> the middle column.
>>>
>>> This behavior takes place for both Racket 5.3.4 and 5.3.6, for Windows
>>> and Linux (Fedora 18). I don't know if it's happening on a Mac as well.
>>>
>>> If there is a plan to fix it in the next release, could you let me know?
>>> We might wait a couple of weeks to upgrade our lab to 5.3.6 is we can get
>>> an upgrade with this issue fixed.
>>>
>>> Many thanks!
>>>
>>> Elena
>>> University of Minnesota, Morris
>>>
>>>
>>> ____________________
>>>  Racket Users list:
>>>  http://lists.racket-lang.org/users
>>>
>>
>>
>>
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>>
>>
>
>
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