This filter allows to write DIN 5008 letter using the scrlttr2 LaTeX document class from KOMA script. It converts metadata to the appropriate KOMA variables and allows using the default LaTeX template shipped with pandoc.

• opening: phrase used as an opening; defaults to "Dear Sir/Madam,"
• closing: closing phrase; defaults to "Sincerely,"
• address: recipient's street address; defaults to "no address given"
• date: the date of the letter; defaults to the current day.

Currently, the following metadata fields are translated to KOMA variables:

• fromaddress (alias: return-address): address of the sender
• fromfax (alias: fax): sender's fax number
• fromemail (alias: email): sender's email
• fromlogo (alias: logo): value to be used as the sender's logo
• fromname (alias: author): sender name
• fromphone (alias: phone): sender's phone number
• fromurl (alias: url): sender's URL
• customer: customer number
• firstfoot: footer on the first page
• invoice: invoice number
• myref: sender's reference
• place: sender's place used near date
• signature: sender's signature
• subject: letter's subject
• title: letter title
• yourref: addressee's reference

The values of these variables are converted to MetaInlines. If a list is given, then each list item is used as a line, e.g.,

fromaddress:
  - 35 Industry Way
  - Springfield

The KOMAoptions value is inferred from the given variables, but can be overwritten by specifying it explicitly.

See the scrlttr2 documentation for details.

Many sender variables don't change, so it is sensible to provide default values for these. Authors using Markdown to draft letters can use a separate YAML file for this. E.g., if there is a file default.yml which contains the sender's details, then only the addressee's data must be specified.

pandoc --lua-filter=scrlttr2 letter.md default.yml -o out.pdf