Print metadata in card's header

Markdown documents must contain yaml frontmatter to be treated as zettels. The following metadata will be read from the frontmatter and shown in card's header.

Zettelkasten ID

Key: id

Currently, only 14 digits format %Y%m%d%H%M%S (datetime's format) is supported.

Last modification date

Keys: date or last_update

The following formats of date strings (datetime's format) are understood:

• %Y-%m-%d %H:%M:%S
• %Y%m%d%H%M%S
• %Y-%m-%d

Tags

Key: tags

List of tags according to the syntax of yaml array list)