Mirage Config

Version 0.0.0
Copyright 2022 Mike Bierlee
Licensed under the terms of the MIT license - See LICENSE.txt

Toolkit for loading and using application configuration from various formats.

Features:

Load from various file formats such as JSON and Java properties;
Environment variable substitution;
Internal configuration substitution (Value in config replaced by other path in config);
Parse configuration from string or JSONValue instead of from disk.

TODO: add tutorial on:

Config loading
Config parsing
Config manip
Env and config var substitution -- Escaping

Getting started

DUB Dependency

See the DUB project page for instructions on how to include Mirage Config into your project.

Quickstart

import std.stdio : writeln;
import mirage : loadConfig, parseJavaProperties;

void main() {
    // Load configuration from file (see examples/quickstart/config.json):
    auto config = loadConfig("config.json");
    writeln(config.get("application.name"));
    writeln(config.get!long("application.version"));

    // Or parse directly from string:
    auto properties = parseJavaProperties("
        databaseDriver = Postgres
        database.host = localhost
        database.port = 5432
    ");

    auto databaseConfig = properties.getConfig("database");

    writeln(properties.get("databaseDriver"));
    writeln(databaseConfig.get("host"));
    writeln(databaseConfig.get("port"));
}

More formats are available (see Formats).
For more details and examples, see the examples directory.

Formats

The following file formats are currently supported:

Format	Extension	Import^*	Loader	Parser	Factory
any below	any below	`mirage`	`loadConfig`^**	(N/A)
JSON	.json	`mirage.json`	`loadJsonConfig`	`parseJsonConfig`^***	`JsonConfigFactory`
Java	.properties	`mirage.java`	`loadJavaProperties`	`parseJavaProperties`	`JavaPropertiesFactory`

^* Any loader or parser can be imported from the mirage package since they are all publicly imported.
^** Loads files based on their extension. If the file does not use one of the extensions in the table, you must use a specific loader.
^*** Besides parsing strings like the other formats, it also accepts a JSONValue.

History

For a full overview of changes, see CHANGES.md

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