Cancel a target while its command is running if a condition is met.
Details
Must be invoked by the target itself. tar_cancel()
cannot interrupt a target from another process.
See also
Other utilities:
tar_active(),
tar_backoff(),
tar_call(),
tar_definition(),
tar_described_as(),
tar_envir(),
tar_format_get(),
tar_group(),
tar_name(),
tar_path(),
tar_path_script(),
tar_path_script_support(),
tar_path_store(),
tar_path_target(),
tar_source(),
tar_store(),
tar_unblock_process()
Examples
if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) { # for CRAN
tar_dir({ # tar_dir() runs code from a temp dir for CRAN.
tar_script(tar_target(x, tar_cancel(1 > 0)))
tar_make() # Should cancel target x.
})
}