yummy: YAML configuration for Clojure application

Yummy allows reading in configuration from YAML files and provides optional facilities for:

• Environment based configuration
• Validation through clojure.spec

Yummy only provides YAML parsing, no generation facilities are present.

Using

Auto determined configuration file paths:

(spec/def ::config (spec/keys :req-un [::http ::logging ::database]))
(yummy.config/load-config {:program-name :mydaemon :spec ::config})

Yummy will look for a configuration-file path in the mydaemon.configuration system property or the MYDAEMON_CONFIGURATION environment variable.

A path can outright be given as well:

(spec/def ::config (spec/keys :req-un [::http ::logging ::database]))
(yummy.config/load-config {:path "/etc/mydaemon.yml" :spec ::config})

Alternately configuration can be loaded from a string:

(yummy.config/load-config-string "a: b" {})

Additional YAML Tags

To make integration as simple as possible, Yummy understands a number of custom tag parsers, namely:

• envdir: loads a map from a directory, treating file names as keys and content as values
• envvar: loads a value from the environment, optionally taking in defaults
• keyword: coerce a string to a keyword
• envfmt: produce a string from a format string and environment variables to pull in
• slurp: produce a string from the given file content

Example

a: !keyword b
b: !envvar HOME
c: !envvar [NOPE, hello]
d: !envdir /tmp/foo
e: !envfmt ["user=%s, home=%s", USER, HOME]
f: !slurp "/etc/hostname"

Documentation

http://exoscale.github.io/yummy

Installation

    [[exoscale/yummy "0.2.4"]]