R: Watch a directory for changes (additions, deletions &...

watch {testthat} | R Documentation

## Watch a directory for changes (additions, deletions & modifications).

### Description

This is used to power the `auto_test()` and `auto_test_package()` functions which are used to rerun tests whenever source code changes.

### Usage

    watch(path, callback, pattern = NULL, hash = TRUE)

### Arguments

`path` | character vector of paths to watch. Omit trailing backslash.
`callback` | function called everytime a change occurs. It should have three parameters: added, deleted, modified, and should return TRUE to keep watching, or FALSE to stop.
`pattern` | file pattern passed to `dir()`
`hash` | hashes are more accurate at detecting changes, but are slower for large files. When FALSE, uses modification time stamps

### Details

Use Ctrl + break (windows), Esc (mac gui) or Ctrl + C (command line) to stop the watcher.

[Package testthat version 2.0.1 Index]