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pandocfilters: Pandoc Filters for R
The existing documentation led me to believe that filter code such as the following, adapted from one of the examples given, would work:
require("pandocfilters", quietly = TRUE, warn.conflicts = FALSE)
caps <- function(key, value, ...) {
if (key == "Str") return( Str( tolower(value) ) )
return(NULL)
}
filter(caps, input = stdin(), output = stdout())
Invoking this with pandoc -F filter.r input.md
(with input.md
containing just one line with a few capitalized words) however throws the following error:
Error in filter(caps, input = stdin(), output = stdout()) :
InputError: The JSON-formatted AST for read in is empty!
Execution halted
Error running filter filter.r:
Filter returned error status 1
FWIW, I’m using pandoc version 2.11.1, and from inside R, executing the example code from “2.2.1. Lower Case” works as expected.
Any advice?
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