for R <= 3.2.2, Unicode chars don't work for shiny mainly because we want to
preserve the source reference, and unfortunately srcfilecopy() fails because of
the bug https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=16264
here I use lines = '' to get around the bug, and assign the source lines to
the srcfile object later, so there is no grep("\n", multibyte_chars) occuring
I also replaced source() with a custom version, which is much simpler and works
better with Unicode chars
This is so that, when a single-file app returns a shinyApp with a blank
`ui` argument, Shiny will not error out, and instead it can search for
a www/ subdirectory.
knitr::asis_output() will decide whether x is cacheable by checking length(meta) == 0. Some shiny tags are cacheable, such as numericInput(), because it is pure HTML without dependencies, whereas selectizeInput() is not cacheable due to the dependency on selectize.js.
All render functions need to call markRenderFunction on their
return values for this mechanism to work.
Also:
- Remove runRmdContainer (it's moved to rmarkdown)
- Remove some bad .Rbuildignore entries
- Make height/width in shinyApp respected
- shinyUI and shinyServer calls are no longer required in ui.R and server.R
- shinyAppObj renamed to shinyApp
- runApp can take pathname, list(ui=..., server=...), shinyApp, and shinyAppDir
as appDir argument
- Unify all Shiny app representations around shiny.appobj
- BREAKING CHANGE: shinyUI no longer has a "path" argument
- Instead of returning UI, ui.R can return a function that returns UI; it will
be invoked each time the page is requested. (Note that this is NOT the same
as saying ui.R will be run each time the page is requested.) The function can
take either no args or a single "req" arg which is the request.
