When the chunk option
autodep = TRUE, all names of objects created in
a chunk will be saved in a file named ‘__objects’ and all global objects
used in a chunk will be saved to ‘__globals’. This function can analyze
object names in these files to automatically build cache dependencies, which
is similar to the effect of the
dependson option. It is supposed to be
used in the first chunk of a document and this chunk must not be cached.
dep_auto(path = opts_chunk$get("cache.path"))
Path to the dependency file.
NULL. The dependencies are built as a side effect.
Be cautious about
path: because this function is used in a
chunk, the working directory when the chunk is evaluated is the directory
of the input document in
knit, and if that directory differs
from the working directory before calling
knit(), you need to adjust
path argument here to make sure this function can find the cache
files ‘__objects’ and ‘__globals’.
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