R/app_server.R

In yonicd/shinycarbon: shinycarbon

#' @title FUNCTION_TITLE
#' @description FUNCTION_DESCRIPTION
#' @param input PARAM_DESCRIPTION
#' @param output PARAM_DESCRIPTION
#' @param session PARAM_DESCRIPTION
#' @return OUTPUT_DESCRIPTION
#' @details DETAILS
#' @examples 
#' \dontrun{
#' if(interactive()){
#'  #EXAMPLE1
#'  }
#' }
#' @rdname app_server
#' @export 
#' @importFrom shiny observeEvent eventReactive renderUI h6 stopApp
#' @importFrom slickR renderSlickR settings slickR `%synch%`
#' @importFrom glue glue
#' @importFrom rtweet lookup_statuses
#' @importFrom magick image_read
app_server <- function(input, output,session) {

  carb <- load_carbonate(td = file.path(tempdir(),'carbonshiny'))
  td <- carb$download_path

  shiny::observeEvent(input$myEditor,{
    carb$code <- input$myEditor
  })
  
  shiny::observeEvent(c(input$local,input$get),{

    output$carbons <- slickR::renderSlickR({
      
      imgs <- list.files(td,full.names = TRUE,pattern = '^(img|local)')

      idx <- htmlwidgets::JS("function(slick,index) {return '<a>'+(index+1)+'</a>';}")
      
      opts <- slickR::settings(adaptiveHeight = TRUE)
      
      if(length(imgs)>1){
        opts <- slickR::settings(adaptiveHeight = TRUE, dots = TRUE, customPaging = idx)
      }

      slickR::slickR(imgs, slideId = 'up',width = '80%') + opts
      
    })
    
  })
  
  observeEvent(input$local,{
    inFile <- input$local
    idx <- length(list.files(td,pattern = '^local')) + 1
    if(!is.null(inFile$datapath)){
      file.copy(inFile$datapath,file.path(td,glue::glue('local_{idx}.png')))
      
      shiny::updateSelectizeInput(
        session = session,
        label = 'select images to tweet',
        inputId = 'tweet_imgs',
        choices = list.files(td, pattern = '^(img|local)'),
        selected = input$tweet_imgs,
        options = list(
          placeholder = 'Select Images to Tweet',
          plugins = list('remove_button', 'drag_drop')
        )
      )
      
    }
  })
  
  shiny::observeEvent(input$get,{
    
    ret <- carb$carbonate(
      file = glue::glue('img_{length(list.files(td)) + 1}.png'),
      path = td
    )
    
    shiny::updateSelectizeInput(
      session = session,
      label = 'select images to tweet',
      inputId = 'tweet_imgs',
      choices = list.files(td, pattern = '^(img|local)'),
      selected = input$tweet_imgs,
      options = list(
        placeholder = 'Select Images to Tweet',
        plugins = list('remove_button', 'drag_drop')
      )
    )
    
  })
  
  # Tweet Status + Reply
  
  reply_handles <- shiny::eventReactive(input$reply_status_id,{
    
    if(!nzchar(input$reply_status_id))
      return('')
    
    reply <- rtweet::lookup_statuses(input$reply_status_id)
    
    parse_handles(text = reply$text, name = reply$screen_name)
    
  })
  
  shiny::observeEvent(c(input$status,input$reply_status_id),{
    
    carb$tweet_status <- glue::glue('{reply_handles()} {input$status}')
    
    output$chars <- shiny::renderUI({
      shiny::h6(glue::glue('Characters: {nchar(carb$tweet_status) -1 }'))
    })
    
  })
  
  shiny::observeEvent(input$post,{

    if( length(list.files(td,pattern = '^local'))>0 ){
      
      local_imgs <- lapply(list.files(td,pattern = '^local',full.names = TRUE), magick::image_read)
      
      carb$carbons <- append(carb$carbons, local_imgs)
      
    }
    
    imgs <- carb$carbons
    names(imgs) <- list.files(td, pattern = '^(img|local)')
    imgs <- imgs[input$tweet_imgs]
    
    media_format <- ifelse(length(imgs)>4,'gif','png')

    carb$rtweet(media = imgs,
                media_format = media_format,
                in_reply_to_status_id = input$reply_status_id)
    
  })
  
  #Close and Cleanup App
  
  shiny::observeEvent(input$cancel, {
    if(input$get>0)
      carb$stop_all()
    unlink(td,recursive = TRUE,force = TRUE)
    shiny::stopApp(invisible())
  })
  
  shiny::observeEvent(input$done, {
    if(input$get>0)
      carb$stop_all()
    unlink(td,recursive = TRUE,force = TRUE)
    shiny::stopApp(invisible())
  })
}