This document specifies knf file format also known as KNF configuration file.

The essential element contained in a KNF file is property. Every property has a name and a value, delimited by a colon sign (:). The name appears to the left of the colon sign.

The name CAN contain only characters a-zA-Z0-9_-. The value can contain any character.

name: value

Properties MUST be grouped into arbitrarily named sections. The section name appears on a line by itself, in square brackets ([ and ]). All properties after the section declaration are associated with that section. There is no explicit "end of section" delimiter; sections end at the next section declaration or at the end of the file. Sections CANNOT be nested.

Section name CAN contain only characters a-zA-Z0-9_-.

Properties may, but need not, have a whitespace or tab indentation.

[section]
  a: 1
  b: 2

Number sign (#) at the beginning of the line indicate a comment. Comment lines are ignored.

Inline comments ARE NOT allowed.

# Main section
[section]

  # Property 1
  a: 1
  
  # Property 2
  b: 2

All previously defined properties can be reused as a value or as a part of the value. Properties must be defined in curly brackets ({ and }) with section and property names delimited by a colon sign (:).

[mail]
  domain: service.mail
  user: john
  address: {mail:user}@{mail:domain}

[log]
  dir: /var/log/{mail:domain}

Leading and trailing whitespace around the outside of the property name ARE ignored.

Section and property names ARE NOT case sensitive.

Duplicate names of sections or properties within one section ARE NOT allowed.

Apache License, Version 2.0