Template context when creating notes

The following variables are available in the templates used when creating new notes – both for the filename and the note content.

Variable	Type	Description
`id`	string	Random ID generated for this note
`title`	string	Note title given to `--title`
`content`	string	Any text piped through the standard input
`dir`	string	Parent directory in the notebook
`extra.<key>`	string	Additional variables provided through the config file or `--extra`
`now`	date	Current date and time, useful when paired with `{{date now}}`
`env`	map	Dictionary of case-sensitive environment variables, e.g. `{{env.PATH}}`.

These additional variables are available only to the note content template, once the filename is generated.

Variable	Type	Description
`filename`	string	Filename generated for this note, including the file extension
`filename-stem`	string	Filename without the file extension