R/open_dashboard.R

In YuLab-SMU/nCov2019: Exploring 'COVID'-19 Statistics

##' @title Shiny app
##' @rdname dashboard
##' @title Dashboard for nCov2019
##' @description A dashboard app for nCov2019 package
##' @return No return value, open shiny app
#' @examples
#' \dontrun{
#' dashboard()
#' # or
#' open_dashboard()
#'}
##' @importFrom downloader download
##' @export 
open_dashboard <- function() {
        package_need <- c('scales','shinycssloaders','shinydashboard', 'plotly', 'ggplot2', 
                'shiny', 'shinyBS', 'DT', 'tidyr', 'reshape2')
        package_no <-  package_need[!is.installed(package_need)]
        
        if(length(package_no) != 0 ) {
            ## pa <- paste0(package_no,"\t")
            ## messages2 <- "Running this shiny app requires some additional R packages, download them? (Y/N): "
            ## ## button2 <- tcltk::tkmessageBox(title='Message', message=messages2, type='yesno')
            ## ## button2 <- tcltk::tclvalue(button2)
            ## button2 <- toupper(readline(prompt = messages2))
            ## if(button2 == 'N'){
            ##     stop("Running this shiny app requires some additional R packages,",
            ##         pa, ",please install them")
            ##     } else {
            ##     message("Running this shiny app requires some additional R packages,",
            ##         pa, ",this will take some time")
            ##     # install packages from CRAN
            ##     ## sapply(package_no, utils::install.packages)
            ##     utils::install.packages(package_no)
            ## }
            msg <- paste0("Running this shiny app requres several additional R packages to be installed:",
                          "\n\t", paste0(package_no, collapse = ","))
            stop(msg)
         }
        pos <- 1
        envir <- as.environment(pos)
        if (!exists("nCov2019Env", envir = .GlobalEnv)) {
            assign("nCov2019Env", new.env(), envir = envir)
        }
        nCov2019Env <- get("nCov2019Env", envir = .GlobalEnv)
        options(nCov2019_dashboard = TRUE)

    # run shinyApp
    shiny::runApp(appDir = system.file("shinyapp" ,package="nCov2019") )
}

##' @rdname dashboard
##' @export 
dashboard <- open_dashboard

is.installed <- function(packages) {
    vapply(packages, function(pkg) {
        system.file(package = pkg) != ""
    }, logical(1))
}