Make data/ directory automatically accessible to exercises

NAMESPACE

@@ -48,6 +48,7 @@ export(tutorial)
 export(tutorial_html_dependency)
 export(tutorial_options)
 export(tutorial_package_dependencies)
+export(use_data_dir)
 import(curl)
 import(rmarkdown)
 import(shiny)

R/exercise.R

@@ -300,6 +300,9 @@ evaluate_exercise <- function(exercise, envir, evaluate_global_setup = FALSE) {
   dir.create(exercise_dir)
   on.exit(unlink(exercise_dir), add = TRUE)
 
+  # Copy files from data directory into exercise
+  copy_data_dir(exercise_dir)
+
   checker_feedback <- NULL
   # Run the checker pre-evaluation _if_ there is code checking to do
   if (length(exercise$code_check)) {

R/initialize.R

@@ -40,6 +40,13 @@ initialize_tutorial <- function() {
       singleton = TRUE
     )
 
+    # # Make files accessible to tutorial
+    # rmarkdown::shiny_prerendered_chunk(
+    #   'server-start',
+    #   'learnr:::prepare_data_files()',
+    #   singleton = TRUE
+    # )
+
     # Register session stop handler
     rmarkdown::shiny_prerendered_chunk(
       'server',

R/use_data_dir.R

@@ -0,0 +1,44 @@
+#' Make files in a directory accessible to tutorials
+#'
+#' By default, `learnr` tutorials can access files in a `data/` directory within
+#' the same directory as the tutorial's R Markdown file. `use_data_dir()` allows
+#' you to expose files in a different directory (e.g. the `data/` directory of a
+#' different tutorial) to avoid duplicating files.
+#'
+#' @param dir A directory
+#'
+#' @return Invisibly returns the specified directory
+#' @export
+#' @examples \dontrun{
+#' use_data_dir("../other_tutorial/data")
+#' }
+
+use_data_dir <- function(dir = "data") {
+  if (!dir.exists(dir)) {
+    rlang::warn(paste0('The data directory "', dir, '" could not be found.'))
+  }
+
+  options(learnr.data_dir = dir)
+
+  invisible(dir)
+}
+
+copy_data_dir <- function(exercise_dir) {
+  # First check environment variable, then options(), then default to "data/"
+  source_dir <- Sys.getenv(
+    "LEARNR_DATA_DIR", unset = getOption("learnr.data_dir", default = "data")
+  )
+
+  if (!dir.exists(source_dir)) {return(invisible(NULL))}
+
+  dest_dir <- file.path(exercise_dir, "data")
+  dir.create(dest_dir)
+
+  if (!dir.exists(dest_dir)) {
+    rlang::abort('The user-facing data directory was not created successfully.')
+  }
+
+  file.copy(dir(source_dir, full.names = TRUE), dest_dir, recursive = TRUE)
+
+  return(invisible(dest_dir))
+}

sandbox/data_dir/base_dir_test/base_dir_test.Rmd

@@ -0,0 +1,19 @@
+---
+title: "Tutorial"
+output: learnr::tutorial
+runtime: shiny_prerendered
+---
+
+```{r setup, include=FALSE}
+library(learnr)
+knitr::opts_chunk$set(echo = FALSE)
+library(readr)
+
+use_data_dir("../file_test/data")
+```
+
+### This exercise uses files in a different `data/` directory with `options()`
+
+```{r read_mpg, exercise=TRUE}
+read_csv("data/mpg.csv")
+```

sandbox/data_dir/envvar_test/envvar_test.Rmd

@@ -0,0 +1,19 @@
+---
+title: "Tutorial"
+output: learnr::tutorial
+runtime: shiny_prerendered
+---
+
+```{r setup, include=FALSE}
+library(learnr)
+knitr::opts_chunk$set(echo = FALSE)
+library(readr)
+
+Sys.setenv(LEARNR_DATA_DIR = "../file_test/data")
+```
+
+### This exercise uses files in a different `data/` directory with env vars
+
+```{r read_mpg, exercise=TRUE}
+read_csv("data/mpg.csv")
+```

sandbox/data_dir/file_test/data/mpg.csv

@@ -0,0 +1,235 @@
+manufacturer,model,displ,year,cyl,trans,drv,cty,hwy,fl,class
+audi,a4,1.8,1999,4,auto(l5),f,18,29,p,compact
+audi,a4,1.8,1999,4,manual(m5),f,21,29,p,compact
+audi,a4,2,2008,4,manual(m6),f,20,31,p,compact
+audi,a4,2,2008,4,auto(av),f,21,30,p,compact
+audi,a4,2.8,1999,6,auto(l5),f,16,26,p,compact
+audi,a4,2.8,1999,6,manual(m5),f,18,26,p,compact
+audi,a4,3.1,2008,6,auto(av),f,18,27,p,compact
+audi,a4 quattro,1.8,1999,4,manual(m5),4,18,26,p,compact
+audi,a4 quattro,1.8,1999,4,auto(l5),4,16,25,p,compact
+audi,a4 quattro,2,2008,4,manual(m6),4,20,28,p,compact
+audi,a4 quattro,2,2008,4,auto(s6),4,19,27,p,compact
+audi,a4 quattro,2.8,1999,6,auto(l5),4,15,25,p,compact
+audi,a4 quattro,2.8,1999,6,manual(m5),4,17,25,p,compact
+audi,a4 quattro,3.1,2008,6,auto(s6),4,17,25,p,compact
+audi,a4 quattro,3.1,2008,6,manual(m6),4,15,25,p,compact
+audi,a6 quattro,2.8,1999,6,auto(l5),4,15,24,p,midsize
+audi,a6 quattro,3.1,2008,6,auto(s6),4,17,25,p,midsize
+audi,a6 quattro,4.2,2008,8,auto(s6),4,16,23,p,midsize
+chevrolet,c1500 suburban 2wd,5.3,2008,8,auto(l4),r,14,20,r,suv
+chevrolet,c1500 suburban 2wd,5.3,2008,8,auto(l4),r,11,15,e,suv
+chevrolet,c1500 suburban 2wd,5.3,2008,8,auto(l4),r,14,20,r,suv
+chevrolet,c1500 suburban 2wd,5.7,1999,8,auto(l4),r,13,17,r,suv
+chevrolet,c1500 suburban 2wd,6,2008,8,auto(l4),r,12,17,r,suv
+chevrolet,corvette,5.7,1999,8,manual(m6),r,16,26,p,2seater
+chevrolet,corvette,5.7,1999,8,auto(l4),r,15,23,p,2seater
+chevrolet,corvette,6.2,2008,8,manual(m6),r,16,26,p,2seater
+chevrolet,corvette,6.2,2008,8,auto(s6),r,15,25,p,2seater
+chevrolet,corvette,7,2008,8,manual(m6),r,15,24,p,2seater
+chevrolet,k1500 tahoe 4wd,5.3,2008,8,auto(l4),4,14,19,r,suv
+chevrolet,k1500 tahoe 4wd,5.3,2008,8,auto(l4),4,11,14,e,suv
+chevrolet,k1500 tahoe 4wd,5.7,1999,8,auto(l4),4,11,15,r,suv
+chevrolet,k1500 tahoe 4wd,6.5,1999,8,auto(l4),4,14,17,d,suv
+chevrolet,malibu,2.4,1999,4,auto(l4),f,19,27,r,midsize
+chevrolet,malibu,2.4,2008,4,auto(l4),f,22,30,r,midsize
+chevrolet,malibu,3.1,1999,6,auto(l4),f,18,26,r,midsize
+chevrolet,malibu,3.5,2008,6,auto(l4),f,18,29,r,midsize
+chevrolet,malibu,3.6,2008,6,auto(s6),f,17,26,r,midsize
+dodge,caravan 2wd,2.4,1999,4,auto(l3),f,18,24,r,minivan
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+toyota,toyota tacoma 4wd,2.7,2008,4,manual(m5),4,17,22,r,pickup
+toyota,toyota tacoma 4wd,3.4,1999,6,manual(m5),4,15,17,r,pickup
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+toyota,toyota tacoma 4wd,4,2008,6,manual(m6),4,15,18,r,pickup
+toyota,toyota tacoma 4wd,4,2008,6,auto(l5),4,16,20,r,pickup
+volkswagen,gti,2,1999,4,manual(m5),f,21,29,r,compact
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+volkswagen,jetta,2.8,1999,6,manual(m5),f,17,24,r,compact
+volkswagen,new beetle,1.9,1999,4,manual(m5),f,35,44,d,subcompact
+volkswagen,new beetle,1.9,1999,4,auto(l4),f,29,41,d,subcompact
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+volkswagen,new beetle,2,1999,4,auto(l4),f,19,26,r,subcompact
+volkswagen,new beetle,2.5,2008,5,manual(m5),f,20,28,r,subcompact
+volkswagen,new beetle,2.5,2008,5,auto(s6),f,20,29,r,subcompact
+volkswagen,passat,1.8,1999,4,manual(m5),f,21,29,p,midsize
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+volkswagen,passat,3.6,2008,6,auto(s6),f,17,26,p,midsize