Merge branch 'dev'

* dev:
  Skip test if offline
  Rebuild documentation
  Make lines shorter
  Reorganize code; Delete code no longer used
  Use markdown for documentation #235
  Use markdown for documentation #235
  Document newly exposed functions #209, #235
  Use markdown in roxygen docs #235
  Use markdown in roxygen docs #235

.gitignore

@@ -4,3 +4,4 @@
 checkpoint.Rproj
 .RData
 inst/doc
+tests/testthat/framed.sty

DESCRIPTION

@@ -32,4 +32,5 @@ Suggests:
     testthat(>= 0.9),
     MASS
 VignetteBuilder: knitr
-RoxygenNote: 5.0.1
+RoxygenNote: 6.0.1
+Roxygen: list(markdown = TRUE)

NAMESPACE

@@ -4,6 +4,7 @@ export(checkpoint)
 export(checkpointArchives)
 export(checkpointRemove)
 export(getValidSnapshots)
+export(mranUrl)
 export(setSnapshot)
 importFrom(utils,Stangle)
 importFrom(utils,available.packages)

R/checkpoint-package.R

@@ -2,15 +2,17 @@
 #'
 #' The goal of checkpoint is to solve the problem of package reproducibility in R. Specifically, checkpoint allows you to install packages as they existed on CRAN on a specific snapshot date as if you had a CRAN time machine.
 #'
-#' To achieve reproducibility, the checkpoint() function installs the packages required or called by your project and scripts to a local library exactly as they existed at the specified point in time. Only those packages are available to your project, thereby avoiding any package updates that came later and may have altered your results. In this way, anyone using the checkpoint checkpoint() function can ensure the reproducibility of your scripts or projects at any time.
+#' To achieve reproducibility, the [checkpoint()] function installs the packages required or called by your project and scripts to a local library exactly as they existed at the specified point in time. Only those packages are available tot your project, thereby avoiding any package updates that came later and may have altered your results. In this way, anyone using the checkpoint [checkpoint()] function can ensure the reproducibility of your scripts or projects at any time.
 #'
-#' To create the snapshot archives, once a day (at midnight UTC) we refresh the Austria CRAN mirror, on the checkpoint server (https://mran.microsoft.com/).  Immediately after completion of the rsync mirror process, we take a snapshot, thus creating the archive.  Snapshot archives exist starting from 2014-09-17.
+#' To create the snapshot archives, once a day (at midnight UTC) we refresh the Austria CRAN mirror, on the checkpoint server (https://mran.microsoft.com/).  Immediately after completion of the `rsync`` mirror process, we take a snapshot, thus creating the archive.  Snapshot archives exist starting from 2014-09-17.
 #'
-#' checkpoint exposes only a single function:
+#' checkpoint exposes functions for:
 #'
-#' \describe{
-#' \item{\code{\link{checkpoint}}}{Configures R session to use packages as they existed on CRAN at time of snapshot.}
-#' }
+#' * [checkpoint()]: Configures R session to use packages as they existed on CRAN at time of snapshot.
+#' * [checkpointArchives()]: List checkpoint archives on disk.
+#' * [checkpointRemove()]: Remove checkpoint archive from disk.
+#' * [setSnapshot()]: Set default CRAN repository to MRAN snapshot date.
+#' * [getValidSnapshots()]: Read list of available snapshot dates from MRAN.
 #'
 #' @name checkpoint-package
 #' @docType package

R/checkpoint_remove.R

@@ -4,7 +4,7 @@
 #' 
 #' @inheritParams checkpoint
 #' @export
-#' @seealso checkpointRemove
+#' @family checkpoint functions
 #' @example inst/examples/example_remove.R
 checkpointArchives <- function(checkpointLocation = "~/"){
   z <- list.files(path = paste0(normalizePath(checkpointLocation), ".checkpoint"), 
@@ -13,11 +13,12 @@ checkpointArchives <- function(checkpointLocation = "~/"){
   normalizePath(z, winslash = "/")
 }
 
+
 #' Remove checkpoint archive from disk.
 #' 
 #' @inheritParams checkpoint
 #' @export
-#' @seealso checkpointArchives
+#' @family checkpoint functions
 #' @example inst/examples/example_remove.R
 checkpointRemove <- function(snapshotDate, checkpointLocation = "~/"){
   z <- list.files(path = paste0(normalizePath(checkpointLocation), ".checkpoint"), 

R/mranUrl.R

@@ -3,44 +3,27 @@ stopIfInvalidDate <- function(snapshotDate, verbose = TRUE){
   if(missing(snapshotDate) || is.null(snapshotDate))
     stop("You have to specify a snapshotDate", call. = FALSE)
   if(!grepl("^\\d{4}-\\d{2}-\\d{2}$", snapshotDate))
-    stop("snapshotDate must be a valid date using format YYYY-MM-DD", call. = FALSE)
+    stop("snapshotDate must be a valid date using format YYYY-MM-DD", 
+         call. = FALSE)
   if(as.Date(snapshotDate) < as.Date("2014-09-17"))
     stop("Snapshots are only available after 2014-09-17", call. = FALSE)
   if(as.Date(snapshotDate) > Sys.Date())
     stop("snapshotDate can not be in the future!", call. = FALSE)
 
-
   validSnapshots <- tryCatch(as.Date(getValidSnapshots()), error=function(e)e)
   if(inherits(validSnapshots, "error")){
     mssg(verbose, "Unable to connect to MRAN. Skipping some date validations.") 
   } else {
     if(!as.Date(snapshotDate) %in% validSnapshots) {
       i <- findInterval(as.Date(snapshotDate), validSnapshots)
       suggestions <- validSnapshots[c(i, i+1)]
-      stop(sprintf("Snapshot does not exist on MRAN. Try %s or %s.", validSnapshots[i], validSnapshots[i+1]))
+      stop(sprintf("Snapshot does not exist on MRAN. Try %s or %s.", 
+                   validSnapshots[i], 
+                   validSnapshots[i+1]))
     }
   }
-
-
 }
 
-# testHttps <- function(https){
-#   tf = tempfile()
-#   dir.create(tf)
-#   on.exit(unlink(tf))
-#   testpkg = "memoise"
-#   repos <- paste0(https, "snapshot/2014-09-12/")
-#   tryCatch(suppressWarnings(utils::install.packages(testpkg, lib = tf, 
-#                                    repos = repos ,
-#                                    dependencies = FALSE, 
-#                                    type = "source",
-#                                    quiet = TRUE)))
-#   if(testpkg %in% installed.packages(lib.loc = tf)[, "Package"]) {
-#     TRUE
-#   } else {
-#     FALSE
-#   }
-# }
 
 mranUrlDefault <- function(){
   http = "http://mran.microsoft.com/"
@@ -63,30 +46,15 @@ isHttpsUrl <- function(url){
   grepl("^https://", url)
 }
 
-# setDownloadOption <- function(mranUrl){
-#   
-#   download.method <- switch(
-#     .Platform$OS.type,
-#     windows = "wininet",
-#     unix    = if(capabilities("libcurl")) "libcurl" else "curl"
-#   )
-#   url.method <- switch(
-#     .Platform$OS.type,
-#     windows = "wininet",
-#     unix    = if(capabilities("libcurl")) "libcurl" else "internal"
-#   )
-#   
-#   options(download.file.method = download.method, 
-#           url.method = url.method)
-# }
-# 
-# resetDownloadOption <- function(opts){
-#   options(opts)
-# }
-
-
-#  ------------------------------------------------------------------------
 
+#' Returns MRAN URL by querying options and defaults.
+#' 
+#' The default MRAN URL is `http(s)://mran.microsoft.com/`, but you can override this by setting the `checkpoint.mranUrl` option.
+#' 
+#' 
+#' @export
+#' @return Character string with URL
+#' @family checkpoint functions
 mranUrl <- function(){
   url <- getOption("checkpoint.mranUrl")
   url <- if(is.null(url)) mranUrlDefault() else url
@@ -107,6 +75,9 @@ setCheckpointUrl <- function(url){
 
 
 tryUrl <- function(url){
+  timeout <- getOption("timeout")
+  on.exit(options(timeout = timeout))
+  options(timeout = 5)
   con <- suppressWarnings(tryCatch(url(url), error = function(e)e))
   msg <- paste0(
     "Invalid value for mranRootUrl.\n", 
@@ -118,29 +89,6 @@ tryUrl <- function(url){
   con
 }
 
-#' Read list of available snapshot dates from MRAN url.
-#' 
-#' @param mranRootUrl URL of MRAN root, e.g. \code{"https://mran.microsoft.com/snapshot/"} or \code{"file:///local/path"}
-#' 
-#' @export
-getValidSnapshots <- function(mranRootUrl = mranUrl()){
-  con <- tryUrl(mranRootUrl)
-  on.exit(close(con))
-  text <- if (inherits(con, "file")) {
-    dir(summary(con)$description)
-  } else {
-    suppressWarnings(tryCatch(readLines(con, warn = TRUE), error = function(e) e))
-  }
-  if (inherits(text, "error")) {
-    stop(sprintf("Unable to download from MRAN: %s", 
-                 text$message))
-  }
-  ptn <- "\\d{4}-\\d{2}-\\d{2}"
-  idx <- grep(ptn, text)
-  gsub(sprintf("^<a href=.*?>(%s).*?</a>.*$", ptn), 
-       "\\1", text[idx])
-}
-
 
 #  ------------------------------------------------------------------------
 

R/setSnapshot.R

@@ -4,6 +4,8 @@
 #'
 #' @export
 #' @example /inst/examples/example_setSnapshot.R
+#' 
+#' @family checkpoint functions
 #'
 setSnapshot <- function(snapshotDate){
   if (missing(snapshotDate) || is.null(snapshotDate)) return(getOption("repos"))
@@ -14,3 +16,32 @@ setSnapshot <- function(snapshotDate){
   options(repos = c(CRAN = repoDate))
   message(paste("Using CRAN mirror at", repoDate))
 }
+
+
+#' Read list of available snapshot dates from MRAN.
+#' 
+#' Returns vector of available dates from MRAN or local MRAN repository.
+#' 
+#' @param mranRootUrl MRAN root. This can be a URL, e.g. `https://mran.microsoft.com/snapshot/` or the path to a local MRAN repository, e.g.`file:///local/path`
+#' 
+#' @export
+#' @return Character vector with dates of valid snapshots
+#' @family checkpoint functions
+getValidSnapshots <- function(mranRootUrl = mranUrl()){
+  con <- tryUrl(mranRootUrl)
+  on.exit(close(con))
+  text <- if (inherits(con, "file")) {
+    dir(summary(con)$description)
+  } else {
+    suppressWarnings(tryCatch(readLines(con, warn = TRUE), error = function(e) e))
+  }
+  if (inherits(text, "error")) {
+    stop(sprintf("Unable to download from MRAN: %s", 
+                 text$message))
+  }
+  ptn <- "\\d{4}-\\d{2}-\\d{2}"
+  idx <- grep(ptn, text)
+  gsub(sprintf("^<a href=.*?>(%s).*?</a>.*$", ptn), 
+       "\\1", text[idx])
+}
+