find_yaml: Find posts containing the specified metadata
Description
Given a YAML field name, find the (R) Markdown files that contain this field
and its value contains any of the specified values. Functions
find_tags() and find_categories() are wrappers of
find_yaml() with field = 'tags' and field =
'categories', respectively; count_fields() returns the frequency
tables of the specified YAML fields, such as the counts of tags and
categories.
Usage
find_yaml(field = character(), value = character(), open = FALSE)
find_tags(value = character(), open = FALSE)
find_categories(value = character(), open = FALSE)