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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/watcher.R
\name{watch}
\alias{watch}
\title{Watch a directory for changes (additions, deletions & modifications).}
\usage{
watch(path, callback, pattern = NULL, hash = TRUE)
}
\arguments{
\item{path}{character vector of paths to watch. Omit trailing backslash.}
\item{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.}
\item{pattern}{file pattern passed to \code{\link[=dir]{dir()}}}
\item{hash}{hashes are more accurate at detecting changes, but are slower
for large files. When FALSE, uses modification time stamps}
}
\description{
This is used to power the \code{\link[=auto_test]{auto_test()}} and
\code{\link[=auto_test_package]{auto_test_package()}} functions which are used to rerun tests
whenever source code changes.
}
\details{
Use Ctrl + break (windows), Esc (mac gui) or Ctrl + C (command line) to
stop the watcher.
}
\keyword{internal}
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