make R.cache an import

.travis.yml

@@ -3,7 +3,7 @@
 # Usually you shouldn't need to change the first part of the file
 
 # DO NOT CHANGE THE CODE BELOW
-before_install: R -q -e 'install.packages(c("remotes", "curl", "knitr", "rmarkdown")); remotes::install_github("ropenscilabs/tic"); tic::prepare_all_stages(); remotes::install_deps(dependencies = TRUE); if (isTRUE(as.logical(toupper(Sys.getenv("R_REMOVE_RCACHE"))))) remove.packages("R.cache"); tic::before_install()'
+before_install: R -q -e 'install.packages(c("remotes", "curl", "knitr", "rmarkdown")); remotes::install_github("ropenscilabs/tic"); tic::prepare_all_stages(); remotes::install_deps(dependencies = TRUE); tic::before_install()'
 install: R -q -e 'tic::install()'
 after_install: R -q -e 'tic::after_install()'
 before_script: R -q -e 'tic::before_script()'
@@ -38,9 +38,6 @@ matrix:
   - r: release
     env:
     - BUILD_PKGDOWN: true
-  - r: release
-    env:
-    - R_REMOVE_RCACHE: true
   - r: devel
 
 #env

DESCRIPTION

@@ -21,6 +21,7 @@ Imports:
     cli (>= 1.1.0),
     magrittr (>= 1.0.1),
     purrr (>= 0.2.3),
+    R.cache (>= 0.14.0),
     rematch2 (>= 2.0.1),
     rlang (>= 0.1.1),
     rprojroot (>= 1.1),
@@ -35,7 +36,6 @@ Suggests:
     here,
     knitr,
     prettycode,
-    R.cache (>= 0.14.0),
     rmarkdown,
     rstudioapi (>= 0.7),
     testthat (>= 2.1.0)

NEWS.md

@@ -1,47 +1,48 @@
-
-# styler 1.2.0.9000
+# styler 1.2.9001
 
 ## Breaking changes
 
-* `style_pkg()` and `style_dir()` gain a new argument `exclude_dirs` to exclude 
-  directories from styling, by default `renv` and `packrat`. Note that the 
-  defaults won't change the behavior of `style_pkg()` because it does anyways 
+* `style_pkg()` and `style_dir()` gain a new argument `exclude_dirs` to exclude
+  directories from styling, by default `renv` and `packrat`. Note that the
+  defaults won't change the behavior of `style_pkg()` because it does anyways
   does not style these directories and they were set for consistency.
-  
-* `style_file()` and friends now strip `./` in file paths returned invisibly,
+
+* `style_file()` and friends now strip `./` in file paths returned invisibly, 
   i.e. `./script.R` becomes `script.R` (#568).
 
 ## New features
 
-* ignore certain lines using `# styler: off` and `#styler: on` or custom 
-  markers, see `help("stylerignore")` (#560).
+* ignore certain lines using `# styler: off` and `#styler: on` or custom
+  markers, see `?stylerignore` (#560).
 
 * styler caches results of styling, so applying styler to code it has styled
   before will be instantaneous. This brings large speed boosts in many
   situations, e.g. when `style_pkg()` is run but only a few files have changed
   since the last styling or when using the [styler pre-commit
-  hook](https://github.com/lorenzwalthert/precommit). Because styler caches
-  by expression, you will also get speed boosts in large files with many 
-  expressions when you only change a few o them. See `help("caching")` for 
-  details (#538, #578).
-  
-* `create_style_guide()` gains two arguments `style_guide_name` and 
-  `style_guide_version` that are carried as meta data, in particular to version 
-  third-party style guides and ensure the proper functioning of caching. This 
+  hook](https://github.com/lorenzwalthert/precommit). Because styler caches by
+  expression, you will also get speed boosts in large files with many
+  expressions when you only change a few of them. See `?caching` for details
+  (#538, #578).
+
+* `create_style_guide()` gains two arguments `style_guide_name` and
+  `style_guide_version` that are carried as meta data, in particular to version
+  third-party style guides and ensure the proper functioning of caching. This
   change is completely invisible to users who don't create and distribute their
   own style guide like `tidyverse_style()` (#572).
 
-
 ## Minor changes and fixes
 
 * lines are now broken after `+` in `ggplot2` calls for `strict = TRUE` (#569).
 
 * function documentation now contains many more line breaks due to roxygen2 
   update to version 7.0.1 (#566).
-  
+
 * spaces next to the braces in subsetting expressions `[` and `[[` are now
   removed (#580).
 
+* Adapt to changes in the R parser to make styler pass R CMD check again.
+  (#583).
+
 # styler 1.2.0
 
 ## Breaking changes
@@ -51,33 +52,33 @@
   This is also reflected in the invisible return value of the function (#522).
 
 * `style_file()` and friends do not write content back to a file when styling
-  does not cause any changes in the file. This means the modification date of 
+  does not cause any changes in the file. This means the modification date of
   styled files is only changed when the content is changed (#532).
 
 ## New features
 
-* Aligned function calls are detected and remain unchanged if they match the styler
-  [definition for aligned function
+* Aligned function calls are detected and remain unchanged if they match the
+  styler [definition for aligned function
   calls](https://styler.r-lib.org/articles/detect-alignment.html) (#537).
 
-* curly-curly (`{{`) syntactic sugar introduced with rlang 0.4.0 is now 
-  explicitly handled, where previously it was just treated as two consecutive 
+* curly-curly (`{{`) syntactic sugar introduced with rlang 0.4.0 is now
+  explicitly handled, where previously it was just treated as two consecutive
   curly braces (#528).
 
 * `style_pkg()`, `style_dir()` and the Addins can now style `.Rprofile`, and
   hidden files are now also styled (#530).
 
 ## Minor improvements and fixes
 
-* Brace expressions in function calls are formatted in a less compact way to 
+* Brace expressions in function calls are formatted in a less compact way to
   improve readability. Typical use case: `tryCatch()` (#543).
 
-* Arguments in function declarations in a context which is indented multiple 
+* Arguments in function declarations in a context which is indented multiple
   times should now be correct. This typically affects `R6::R6Class()` (#546).
 
 * Escape characters in roxygen code examples are now correctly escaped (#512).
 
-* Special characters such as `\n` in strings are now preserved in text and not 
+* Special characters such as `\n` in strings are now preserved in text and not
   turned into literal values like a line break (#554).
 
 * Style selection Addin now preserves line break when the last line selected is

R/communicate.R

@@ -34,37 +34,3 @@ assert_data.tree_installation <- function() {
     abort("The package data.tree needs to be installed for this functionality.")
   }
 }
-
-#' Assert the R.cache installation in conjunction with the cache config
-#'
-#' R.cache needs to be installed if caching functionality is enabled
-#' @param installation_only Whether or not to only check if R.cache is
-#'   installed.
-#' @keywords internal
-assert_R.cache_installation <- function(installation_only = FALSE,
-                                        action = "abort") {
-  # fail if R.cache is not installed but feature is actiavted.
-  if (!rlang::is_installed("R.cache") &&
-    ifelse(installation_only, TRUE, cache_is_activated())
-  ) {
-    msg_basic <- paste(
-      "R package R.cache is not installed, which is needed when the caching ",
-      "feature is activated. Please install the package with ",
-      "`install.packages('R.cache')` and then restart R to enable the ",
-      "caching feature of styler or permanently deactivate the feature by ",
-      "adding `styler::cache_deactivate()` to your .Rprofile, e.g. via ",
-      "`usethis::edit_r_profile()`.",
-      sep = ""
-    )
-
-    if (action == "abort") {
-      rlang::abort(msg_basic)
-    } else {
-      rlang::warn(paste0(
-        msg_basic, " ",
-        "Deactivating the caching feature for the current session."
-      ))
-      cache_deactivate(verbose = FALSE)
-    }
-  }
-}

R/transform-files.R

@@ -78,12 +78,9 @@ make_transformer <- function(transformers,
                              warn_empty = TRUE) {
   force(transformers)
   assert_transformers(transformers)
-  assert_R.cache_installation(action = "warn")
-
-  is_R.cache_installed <- rlang::is_installed("R.cache")
 
   function(text) {
-    should_use_cache <- is_R.cache_installed && cache_is_activated()
+    should_use_cache <- cache_is_activated()
 
     if (should_use_cache) {
       use_cache <- is_cached(text, transformers)

R/ui-caching.R

@@ -14,7 +14,6 @@
 #' @family cache managers
 #' @export
 cache_clear <- function(cache_name = NULL, ask = TRUE) {
-  assert_R.cache_installation(installation_only = TRUE)
   path_cache <- cache_find_path(cache_name)
   R.cache::clearCache(path_cache, prompt = ask)
   cache_deactivate(verbose = FALSE)
@@ -23,15 +22,45 @@ cache_clear <- function(cache_name = NULL, ask = TRUE) {
 
 #' Remember the past to be quicker in the future
 #'
-#' styler by default uses caching. It may prompt you to install the R package
-#' `R.cache` the first time you want to use it. R.cache will also ask you to let
-#' it create a permanent cache on your file system that styler will use.
-#' This is needed if you want to cache across R sessions and not just within.
+#' Caching makes styler faster on repeated styling. It does not cache input
+#' but output code. That means if you style code that already complies to a
+#' style guide and you have previously styled that code, it will be quicker.
+#' Code is cached by expression and the cache is shared across all APIs (e.g.
+#' `style_text()` and Addin.
+#'
+#' @section Setup:
+#' styler by default uses caching, via the `{R.cache}` package. You will be
+#' asked you to let it create a permanent cache on your file system that styler
+#' will use in case it is not set that up already for another tool that
+#' uses `{R.cache}`. We encourage users to let `{R.cache}` create a permanent
+#' directory for caching, because otherwise, the cache is lost at restart of R.
+#'
+#' @section Non-interactive use:
+#' Note that if you have never authorised `{R.cache}` to create the cache in a
+#' permenent directory, it wil build the cache in a temporary directory. To
+#' create a permenent cache, just open an interactive R session and type
+#' `cache_info()`. You can see under `Location:` if a permanent directory is
+#' used and if not, `{R.cache}` will ask you to create one the first time you
+#' use `{R.cache}` in an R session.
+#'
+#' @section Invalidation:
 #' The cache is specific to a version of styler by default, because different
 #' versions potentially format code differently. This means after upgrading
 #' styler or a style guide you use, the cache will be re-built.
+#'
+#' @section Manage the cache:
 #' See [cache_info()],
-#' [cache_activate()], [cache_clear()] for utilities to manage the cache.
+#' [cache_activate()], [cache_clear()] for utilities to manage the cache. Since
+#' we leverage `{R.cache}` to manage the cache, you can also use any `{R.cache}`
+#' functionality to manipulate it.
+#'
+#' @section Using a cache for styler in CI/CD:
+#' If you want to set up caching in a CI/CD pipeline, we suggest to set the
+#' `{R.cache}` root path to a directory for which you have the cache enabled.
+#' The former can be done with `R.cache::setCacheRootPath("/path/to/cache")`,
+#' the latter can often be set in config files of CI/CD tools, e.g. see the
+#' the [Travis documentation on caching](https://docs.travis-ci.com/user/caching).
+#'
 #' @name caching
 NULL
 
@@ -50,7 +79,6 @@ NULL
 #' @family cache managers
 #' @export
 cache_info <- function(cache_name = NULL, format = "both") {
-  assert_R.cache_installation(installation_only = TRUE)
   rlang::arg_match(format, c("tabular", "lucid", "both"))
   path_cache <- cache_find_path(cache_name)
   files <- list.files(path_cache, full.names = TRUE)
@@ -92,7 +120,6 @@ cache_info <- function(cache_name = NULL, format = "both") {
 #' @family cache managers
 #' @export
 cache_activate <- function(cache_name = NULL, verbose = TRUE) {
-  assert_R.cache_installation(installation_only = TRUE)
   if (!is.null(cache_name)) {
     options("styler.cache_name" = cache_name)
   } else {

README.Rmd

@@ -27,23 +27,28 @@ version](https://www.r-pkg.org/badges/version/styler)](https://cran.r-project.or
 
 The goal of styler is to provide non-invasive pretty-printing of R source code
 while adhering to the [tidyverse](https://style.tidyverse.org) formatting rules.
-styler can be customized to format code according to other style guides too. 
+styler can be customized to format code according to other style guides too.
 
 The following online docs are available:
 
 - [latest CRAN release](https://styler.r-lib.org).
 
 - [GitHub development version](https://styler.r-lib.org/dev).
 
-
 ## Installation
 
-You can install the package from CRAN:
+You can install the package from CRAN.
 
 ```{r, eval = FALSE}
 install.packages("styler")
 ```
 
+If you don't use styler interactively (i.e. not from the R prompt or Rstudio 
+Addin), make sure you authorise `{R.cache}` once to set up a permanent cache. 
+If you use it interactively, you will be asked to grant this permission once.
+See `?caching` for details.
+
+
 Or get the development version from GitHub:
 
 ```{r, eval = FALSE}
@@ -76,20 +81,6 @@ There are a few variants of `style_text()`:
 knitr::include_graphics("https://raw.githubusercontent.com/lorenzwalthert/some_raw_data/master/styler_0.1.gif")
 ```
 
-## Features
-
-* style roxygen2 code examples.
-
-* do not re-style [deliberate code
-  alignment](https://styler.r-lib.org/articles/detect-alignment.html).
-
-* [ignore some lines](https://styler.r-lib.org/reference/stylerignore.html) for 
-  styling (GitHub development version).
-
-* [cache styled expressions](https://styler.r-lib.org/reference/caching.html) 
-  for speed (GitHub development version). 
-
-
 ## Configuration
 
 You can decide on the level of invasiveness with the scope argument. You can
@@ -116,11 +107,24 @@ Note that compared to the default used above `scope = "tokens"`:
 
 While spaces still got styled (around `=` in `(x)`).
 
-This was just the tip of the iceberg. To learn more about customization options 
-with the tidyverse style guide, see the [help file for `tidyverse_style](https://styler.r-lib.org/reference/tidyverse_style.html) for a
-quick overview or the 
-[introductory vignette](https://styler.r-lib.org/articles/introducing_styler.html).
+This was just the tip of the iceberg. To learn more about customization options
+with the tidyverse style guide, see the [help file for
+`tidyverse_style](https://styler.r-lib.org/reference/tidyverse_style.html) for a
+quick overview or the [introductory
+vignette](https://styler.r-lib.org/articles/introducing_styler.html).
+
+## Features
+
+* style roxygen2 code examples.
+
+* do not re-style [deliberate code
+  alignment](https://styler.r-lib.org/articles/detect-alignment.html).
+
+* [ignore some lines](https://styler.r-lib.org/dev/reference/stylerignore.html)
+  for styling.
 
+* [cache styled
+  expressions](https://styler.r-lib.org/dev/reference/caching.html) for speed.
 
 ## Adaption of styler