[Hat] problem specifying location of imported module

[Olaf Chitil]

You are right that hat-trans and hmake have to agree on the directory 
structure (although duplicating this information is not nice).

Is not the point of the -i option to set the *base* search paths? Such a 
path should always point to the base of a possibly hierachical 
namespace. So extending the base with "/Hat" would be correct.

This also suggests that hat-trans should always be called with the full 
hierarchical name of a module. Otherwise hat-trans would need to find 
out to which hierarchy (given several search paths) the module to be 
transformed belongs.

The guessing method used by hmake and now also by hat-trans based on 
occurrence of "." or ".." is rather brittle.

Ciao,
Olaf


Malcolm Wallace wrote:

>Olaf Chitil <O.Chitil at kent.ac.uk> writes:
>
>  
>
>>>Above it looks like the wrong directory was created. Hat created the
>>>directory Hat/../Code when I think it should have created the
>>>directory ../Code/Hat.
>>>      
>>>
>>I agree. The directory Hat should be put at the end of the import path, 
>>not at the begining.
>>    
>>
>
>The placement of the Hat directory (at the beginning or end of
>a path) is dependent on how the directory name is to be interpreted.
>A path corresponding to the hierarchical module namespace, like
>    Code/Pictures/Jpg.hs
>should become
>    Hat/Code/Pictures/Jpg.hs
>whereas a mere relative pathname with a flat namespace should be the
>opposite, e.g.
>    ../Code/Pictures/Jpg.hs
>becomes
>    ../Code/Pictures/Hat/Jpg.hs
>
>
>  
>
>>This is a problem with hmake, not with the Hat tools themselves. 
>>Malcolm, could you modify hmake accordingly?
>>    
>>
>
>Actually, in this instance hmake guessed the directory correctly.
>The fault was with hat-trans, which simply assumed all paths were
>strictly hierarchical.  The attached patch should fix it.
>  
>