Add development environment using packrat

.Rprofile

@@ -0,0 +1,3 @@
+#### -- Packrat Autoloader (version 0.4.8-1) -- ####
+source("packrat/init.R")
+#### -- End Packrat Autoloader -- ####

.gitignore

@@ -7,3 +7,4 @@ UD.zip
 inst
 *.Rproj
 packrat/lib*/
+packrat/src*/

packrat/init.R

@@ -0,0 +1,217 @@
+local({
+
+  ## Helper function to get the path to the library directory for a
+  ## given packrat project.
+  getPackratLibDir <- function(projDir = NULL) {
+    path <- file.path("packrat", "lib", R.version$platform, getRversion())
+
+    if (!is.null(projDir)) {
+
+      ## Strip trailing slashes if necessary
+      projDir <- sub("/+$", "", projDir)
+
+      ## Only prepend path if different from current working dir
+      if (!identical(normalizePath(projDir), normalizePath(getwd())))
+        path <- file.path(projDir, path)
+    }
+
+    path
+  }
+
+  ## Ensure that we set the packrat library directory relative to the
+  ## project directory. Normally, this should be the working directory,
+  ## but we also use '.rs.getProjectDirectory()' if necessary (e.g. we're
+  ## rebuilding a project while within a separate directory)
+  libDir <- if (exists(".rs.getProjectDirectory"))
+    getPackratLibDir(.rs.getProjectDirectory())
+  else
+    getPackratLibDir()
+
+  ## Unload packrat in case it's loaded -- this ensures packrat _must_ be
+  ## loaded from the private library. Note that `requireNamespace` will
+  ## succeed if the package is already loaded, regardless of lib.loc!
+  if ("packrat" %in% loadedNamespaces())
+    try(unloadNamespace("packrat"), silent = TRUE)
+
+  if (suppressWarnings(requireNamespace("packrat", quietly = TRUE, lib.loc = libDir))) {
+
+    # Check 'print.banner.on.startup' -- when NA and RStudio, don't print
+    print.banner <- packrat::get_opts("print.banner.on.startup")
+    if (print.banner == "auto" && is.na(Sys.getenv("RSTUDIO", unset = NA))) {
+      print.banner <- TRUE
+    } else {
+      print.banner <- FALSE
+    }
+    return(packrat::on(print.banner = print.banner))
+  }
+
+  ## Escape hatch to allow RStudio to handle bootstrapping. This
+  ## enables RStudio to provide print output when automagically
+  ## restoring a project from a bundle on load.
+  if (!is.na(Sys.getenv("RSTUDIO", unset = NA)) &&
+      is.na(Sys.getenv("RSTUDIO_PACKRAT_BOOTSTRAP", unset = NA))) {
+    Sys.setenv("RSTUDIO_PACKRAT_BOOTSTRAP" = "1")
+    setHook("rstudio.sessionInit", function(...) {
+      # Ensure that, on sourcing 'packrat/init.R', we are
+      # within the project root directory
+      if (exists(".rs.getProjectDirectory")) {
+        owd <- getwd()
+        setwd(.rs.getProjectDirectory())
+        on.exit(setwd(owd), add = TRUE)
+      }
+      source("packrat/init.R")
+    })
+    return(invisible(NULL))
+  }
+
+  ## Bootstrapping -- only performed in interactive contexts,
+  ## or when explicitly asked for on the command line
+  if (interactive() || "--bootstrap-packrat" %in% commandArgs(TRUE)) {
+
+    message("Packrat is not installed in the local library -- ",
+            "attempting to bootstrap an installation...")
+
+    ## We need utils for the following to succeed -- there are calls to functions
+    ## in 'restore' that are contained within utils. utils gets loaded at the
+    ## end of start-up anyhow, so this should be fine
+    library("utils", character.only = TRUE)
+
+    ## Install packrat into local project library
+    packratSrcPath <- list.files(full.names = TRUE,
+                                 file.path("packrat", "src", "packrat")
+    )
+
+    ## No packrat tarballs available locally -- try some other means of installation
+    if (!length(packratSrcPath)) {
+
+      message("> No source tarball of packrat available locally")
+
+      ## There are no packrat sources available -- try using a version of
+      ## packrat installed in the user library to bootstrap
+      if (requireNamespace("packrat", quietly = TRUE) && packageVersion("packrat") >= "0.2.0.99") {
+        message("> Using user-library packrat (",
+                packageVersion("packrat"),
+                ") to bootstrap this project")
+      }
+
+      ## Couldn't find a user-local packrat -- try finding and using devtools
+      ## to install
+      else if (requireNamespace("devtools", quietly = TRUE)) {
+        message("> Attempting to use devtools::install_github to install ",
+                "a temporary version of packrat")
+        library(stats) ## for setNames
+        devtools::install_github("rstudio/packrat")
+      }
+
+      ## Try downloading packrat from CRAN if available
+      else if ("packrat" %in% rownames(available.packages())) {
+        message("> Installing packrat from CRAN")
+        install.packages("packrat")
+      }
+
+      ## Fail -- couldn't find an appropriate means of installing packrat
+      else {
+        stop("Could not automatically bootstrap packrat -- try running ",
+             "\"'install.packages('devtools'); devtools::install_github('rstudio/packrat')\"",
+             "and restarting R to bootstrap packrat.")
+      }
+
+      # Restore the project, unload the temporary packrat, and load the private packrat
+      packrat::restore(prompt = FALSE, restart = TRUE)
+
+      ## This code path only reached if we didn't restart earlier
+      unloadNamespace("packrat")
+      requireNamespace("packrat", lib.loc = libDir, quietly = TRUE)
+      return(packrat::on())
+
+    }
+
+    ## Multiple packrat tarballs available locally -- try to choose one
+    ## TODO: read lock file and infer most appropriate from there; low priority because
+    ## after bootstrapping packrat a restore should do the right thing
+    if (length(packratSrcPath) > 1) {
+      warning("Multiple versions of packrat available in the source directory;",
+              "using packrat source:\n- ", shQuote(packratSrcPath))
+      packratSrcPath <- packratSrcPath[[1]]
+    }
+
+
+    lib <- file.path("packrat", "lib", R.version$platform, getRversion())
+    if (!file.exists(lib)) {
+      dir.create(lib, recursive = TRUE)
+    }
+    lib <- normalizePath(lib, winslash = "/")
+
+    message("> Installing packrat into project private library:")
+    message("- ", shQuote(lib))
+
+    surround <- function(x, with) {
+      if (!length(x)) return(character())
+      paste0(with, x, with)
+    }
+
+    ## The following is performed because a regular install.packages call can fail
+    peq <- function(x, y) paste(x, y, sep = " = ")
+    installArgs <- c(
+      peq("pkgs", surround(packratSrcPath, with = "'")),
+      peq("lib", surround(lib, with = "'")),
+      peq("repos", "NULL"),
+      peq("type", surround("source", with = "'"))
+    )
+    installCmd <- paste(sep = "",
+                        "utils::install.packages(",
+                        paste(installArgs, collapse = ", "),
+                        ")")
+
+    fullCmd <- paste(
+      surround(file.path(R.home("bin"), "R"), with = "\""),
+      "--vanilla",
+      "--slave",
+      "-e",
+      surround(installCmd, with = "\"")
+    )
+    system(fullCmd)
+
+    ## Tag the installed packrat so we know it's managed by packrat
+    ## TODO: should this be taking information from the lockfile? this is a bit awkward
+    ## because we're taking an un-annotated packrat source tarball and simply assuming it's now
+    ## an 'installed from source' version
+
+    ## -- InstallAgent -- ##
+    installAgent <- 'InstallAgent: packrat 0.4.8-1'
+
+    ## -- InstallSource -- ##
+    installSource <- 'InstallSource: source'
+
+    packratDescPath <- file.path(lib, "packrat", "DESCRIPTION")
+    DESCRIPTION <- readLines(packratDescPath)
+    DESCRIPTION <- c(DESCRIPTION, installAgent, installSource)
+    cat(DESCRIPTION, file = packratDescPath, sep = "\n")
+
+    # Otherwise, continue on as normal
+    message("> Attaching packrat")
+    library("packrat", character.only = TRUE, lib.loc = lib)
+
+    message("> Restoring library")
+    restore(restart = FALSE)
+
+    # If the environment allows us to restart, do so with a call to restore
+    restart <- getOption("restart")
+    if (!is.null(restart)) {
+      message("> Packrat bootstrap successfully completed. ",
+              "Restarting R and entering packrat mode...")
+      return(restart())
+    }
+
+    # Callers (source-erers) can define this hidden variable to make sure we don't enter packrat mode
+    # Primarily useful for testing
+    if (!exists(".__DONT_ENTER_PACKRAT_MODE__.") && interactive()) {
+      message("> Packrat bootstrap successfully completed. Entering packrat mode...")
+      packrat::on()
+    }
+
+    Sys.unsetenv("RSTUDIO_PACKRAT_BOOTSTRAP")
+
+  }
+
+})