set_hooks: Set and remove hooks

In r-lib/evaluate: Parsing and Evaluation Tools that Provide More Details than the Default

Set and remove hooks

Description

This interface wraps the base setHook() function to provide a return value that makes it easy to undo.

Usage

set_hooks(hooks, action = "append")

remove_hooks(hooks)

Arguments

hooks	a named list of hooks - each hook can either be a function or a list of functions.
action	"replace", "append" or "prepend"

Examples

new1 <- list(before.plot.new = function() print("Plotted!"))
new2 <- list(before.plot.new = function() print("Plotted Again!"))
set_hooks(new1)
set_hooks(new2)
plot(1)
remove_hooks(new1)
plot(1)
remove_hooks(new2)
plot(1)

r-lib/evaluate documentation built on Sept. 15, 2024, 5:32 p.m.