[Rd] Link to pdf documentation from other package ?

[Ulrike Grömping]

Duncan Murdoch schrieb:
> Ulrike Groemping wrote:
>>
>> Duncan Murdoch-2 wrote:
>>  
>>> Ulrike Groemping wrote:
>>>    
>>>> Dear developeRs,
>>>>
>>>> I have not found anything recent about how to link to a vignette or 
>>>> other
>>>> documentation from within Rd-files. Is this now possible with the new
>>>> help
>>>> system ? For example, I would like to link to the file AlgDesign.pdf
>>>> provided within the doc directory of package AlgDesign.
>>>>
>>>>         
>>> Yes, you can do it with a \url{} macro.  Use a relative link, acting 
>>> as though the starting page is located in 
>>> /library/AlgDesign/html/*.  So \url{../doc/AlgDesign.pdf}
>>> should work from the same package, 
>>> \url{../../AlgDesign/doc/AlgDesign.pdf} from elsewhere.  Please let 
>>> me know if this doesn't work, I haven't tested.
>>>
>>> Duncan Murdoch
>>>
>>>     
>>
>> Yes, this works, thanks! Is it also possible to display an 
>> alternative text
>> instead of the URL itself, like with other links (e.g. show text 
>> "Open pdf"
>> that operates the link) ?
>>
>>   
>
> There's no optional text in the \url{} tag, but you could embed it in 
> an \ifelse tag, e.g.
>
> \ifelse{html}{\url{ ....  }}{ [open pdf ...] }
>
> might work.  Using the \ifelse tag will make your package depend on R 
> >= 2.10.0.
>
> Duncan Murdoch
>>   
Another thought: the link only works, if the two packages are installed 
in the same library, doesn't it ? Would there be a way to make it work 
independently of this restriction ?

Regards, Ulrike