Parameterize error function

[tonyfischetti]

Right now assertr uses "stop" and a message to halt execution. I should allow the user to specify their own function that will be called when an assertion is violated.

For example, one could make a function that accepts the error string and emails the error message before calling stop

a generalized solution is to make a function that takes an email address and an error string, emails the error string to the email address and then halts execution. Then, a partially applied function can be used as the custom error function...

email.and error <- function(email, message){
  ...
}

mtcars %>% assert(is_set(c(1,0)), vs, on_error=partial(email.and.error("me@me.org")))

[tonyfischetti]

Almost done! Just need to update

• version number
• readme
• news
• vignette
• roxegen doc to include new optional parameters