Hooks for code chunk options
Like knit_hooks, this object can be used to set hook functions
to manipulate chunk options.
opts_hooks
An object of class list of length 6.
For every code chunk, if the chunk option named, say, FOO, is not
NULL, and a hook function with the same name has been set via
opts_hooks$set(FOO = function(options) { options }) (you can manipuate
the options argument in the function and return it), the hook function
will be called to update the chunk options.
# make sure the figure width is no smaller than fig.height
opts_hooks$set(fig.width = function(options) {
if (options$fig.width < options$fig.height) {
options$fig.width = options$fig.height
}
options
})
# remove all hooks
opts_hooks$restore()Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.