watch: Watch a directory for changes (additions, deletions &...
In testthat: Unit Testing for R

watch

R Documentation

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

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

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

`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