[Bioc-devel] installed, system.file(package="RCyjs") is "/Users/biocbuild/bbs-3.8-bioc/meat/RCyjs.buildbin-libdir/RCyjs"

[Paul Shannon]

That did it.   Thank you!

 - Paul

> On Jun 29, 2018, at 4:11 PM, Martin Morgan <martin.morgan using roswellpark.org> wrote:
> 
> 
> 
> On 06/29/2018 06:44 PM, Paul Shannon wrote:
>> My package RCyjs reads an html/js/css file when the constructor is called, then sends that file to the user’s browser.
>> The actual path to that file is calculated at global scope in RCyjs-class.R:
>>    cyjsBrowserFile <- system.file(package="RCyjs", "browserCode", "dist", "rcyjs.html”)
>> That file cannot be found at runtime.  Using
>>   options(error=recover)
>> I can trap that error, finding these two different interpretations of system.file(package=“RCyjs”):
>>    cyjsBrowserFile:
>>        "/Users/biocbuild/bbs-3.8-bioc/meat/RCyjs.buildbin-libdir/RCyjs/browserCode/dist/rcyjs.html”
>>     system.file(package="RCyjs")
>>       "/Library/Frameworks/R.framework/Versions/3.5/Resources/library/RCyjs”
>> It appears that cyjsBrowserFile is assigned at the build system’s package construction time, not at the package load and use time.
>> Maybe this is new behavior?   Any suggestions on how to defer the calculation of system.file(package=“RCyjs”) till run time?
> 
> you have the assignment at the 'top' level of your package R code
> 
> cyjsBrowserFile <- system.file(package="RCyjs", ...)
> 
> so that it gets evaluated when R source()s the file (approximately) to create the package. The correct paradigm would be to create the reference when the package is loaded, using .onLoad
> 
> cyjsBrowserFile <- NULL     # create symbol when built
> 
> .onLoad <- function(...) {
>    cyjsBrowserFile <<- system.file(...  # assign symbol (using <<-) on load
> }
> 
> Martin
> 
>> Thanks!
>>  - Paul
>> _______________________________________________
>> Bioc-devel using r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/bioc-devel
> 
> 
> This email message may contain legally privileged and/or confidential information.  If you are not the intended recipient(s), or the employee or agent responsible for the delivery of this message to the intended recipient(s), you are hereby notified that any disclosure, copying, distribution, or use of this email message is prohibited.  If you have received this message in error, please notify the sender immediately by e-mail and delete this email message from your computer. Thank you.