Add pre-commit config so formatR can be used as a remote hook

.Rbuildignore

@@ -1,3 +1,5 @@
+^renv$
+^renv\.lock$
 inst/examples
 .gitignore
 ^\.Rproj\.user$

.Rprofile

@@ -0,0 +1,2 @@
+Sys.setenv(RENV_CONFIG_AUTO_SNAPSHOT = "FALSE")
+source("renv/activate.R")

.pre-commit-hooks.yaml

@@ -0,0 +1,8 @@
+- id: formatr
+  name: formatR
+  description: Uses formatR to format R files
+  entry: Rscript scripts/pre-commit-formatR.R
+  language: r
+  types: [text]
+  files: '.*.[rR]$'
+  additional_dependencies: [docopt]

README.md

@@ -14,3 +14,20 @@ to
 
 [![R source code after
 reformatting](https://db.yihui.org/imgur/TBZm0B8.png)](https://yihui.shinyapps.io/formatR/)
+
+## Pre-commit Hook
+
+formatR is available as a pre-commit hook. The following arguments are available:
+
+```
+Options:    
+  --no-comments         Remove comments. 
+  --no-blanks           Remove blank lines. 
+  --arrow               If given, arrows will not be substituted for = signs. 
+  --pipe                If given, pipes will not be changed. 
+  --brace-newline       If given, braces will not be put on new lines. 
+  --indent=INDENT       Number of indents. [default: 4]    
+  --no-wrap             Skip wrapping the text. 
+  --width-cutoff=WIDTH  Text width cutoff. [default: 80]    
+  --args-newline        If TRUE, arguments are started on a new line after a function call. [default: FALSE]    
+```

renv.lock

@@ -0,0 +1,23 @@
+{
+  "R": {
+    "Version": "4.3.3",
+    "Repositories": [
+      {
+        "Name": "CRAN",
+        "URL": "https://cran.csiro.au"
+      }
+    ]
+  },
+  "Packages": {
+    "renv": {
+      "Package": "renv",
+      "Version": "1.0.5",
+      "Source": "Repository",
+      "Repository": "CRAN",
+      "Requirements": [
+        "utils"
+      ],
+      "Hash": "32c3f93e8360f667ca5863272ec8ba6a"
+    }
+  }
+}

renv/.gitignore

@@ -0,0 +1,7 @@
+library/
+local/
+cellar/
+lock/
+python/
+sandbox/
+staging/