A helper function to query the fuse() context (such as the input file path
or the output format name) when called inside a code chunk.
get_context(item = NULL)If the item is provided, return its value in the context. If
NULL, the whole context (an environment) is returned.
litedown::get_context("input")
#> NULL
litedown::get_context("format")
#> NULL
names(litedown::get_context()) # all available items
#> character(0)