pub const TMPL_VAR_FM_FILE_EXT: &str = "fm_file_ext";Expand description
By default, the template tmpl.sync_filename defines the function of this
variable as follows:
Contains the value of the front matter field file_ext and determines the
markup language used to render the document. When the field is missing the
markup language is derived from the note’s filename extension.
This is a dynamically generated variable originating from the front matter
of the current note. As all front matter variables, its value is copied as
it is without modification. Here, the only special treatment is, when
analyzing the front matter, it is verified, that the value of this variable
is registered in one of the filename.extensions_* variables.