Selects the input format.
Supported values:
bigb: the default an recommended formatmd, see:--input-format md
The input format is automatically selected from the file extension, e.g.
.md or .markdown input files. For input from standard input, it can be selected explicitly e.g. with:printf '# Hello' | ourbigbook -I markdown -O bigb --stdoutDirectory conversion remains BigB-only unless
-I markdown is given, so that Markdown documentation files such as README.md are not compiled unexpectedly.