Scrape options from a code block
scrape_opts(x, envir = list(), def = list(), all = TRUE,
marker = "=", allow_multiple = FALSE, narrow = TRUE)data
environment from $ENV
default values
return all options, even those that are not in def
assignment operator; used to locate lines with options
if TRUE, the list with replicate names
will be reduced
logical; if TRUE, only get options on lines starting
with >>
list with elements x (the data without options) and named
options as specified in the block.