That did it. Thank you!
- Paul
> On Jun 29, 2018, at 4:11 PM, Martin Morgan <martin.mor...@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
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