The following tasks are not registered by default in a Loom project, but can be registered to provide additional functionality.

Fabric Mod JSON Generation

The net.fabricmc.loom.task.FabricModJsonV1Task is a task that can be used to generate a valid fabric.mod.json file for your mod. This is a simple task that outputs a file, its up to you to configure your buildscript to include the file in your mods resources however you see fit.

tasks.register("generateModJson", net.fabricmc.loom.task.FabricModJsonV1Task) {
    outputFile = file("fabric.mod.json")

    json {
        modId = "example-mod"
        version = "1.0.0"
    }
}

The above example is the most basic usage of the task, and will generate a fabric.mod.json file with the mod id and version specified. The json block supports all fields defined in the Fabric Mod JSON schema. See FabricModJsonV1Spec for a full list of supported properties.

Download Task

The net.fabricmc.loom.task.DownloadTask is a simple task that can be used to download files from a URL to a specified location.

For example, to download a file from a certain URL and save it in out.txt in the project directory:

tasks.register("download", net.fabricmc.loom.task.DownloadTask) {
    url = "https://example.com/file.txt"
    output = file("out.txt")
}

You can also specify an expected SHA-1 hash which will be used to verify the integrity of the downloaded file, and a maximum age to require downloading again once the file is no longer fresh:

tasks.register("download", net.fabricmc.loom.task.DownloadTask) {
    url = "https://example.com/file.txt"
    output = file("out.txt")
    sha1 = "EXPECTED-SHA1-HASH-HERE"
    maxAge = Duration.ofDays(1)
}

ModEnigmaTask

The net.fabricmc.loom.task.tool.ModEnigmaTask is an advanced task that can be used to launch Enigma against a mappings file. This can be used to generate mod provided javadoc.

tasks.register("enigma", net.fabricmc.loom.task.tool.ModEnigmaTask) {
    mappingsFile = file("mappings.mapping")
}

ValidateMixinNameTask

The net.fabricmc.loom.task.ValidateMixinNameTask is a task that can be used to validate that the Mixin class name matches the name of the target class.

    tasks.register('validateMixinNames', net.fabricmc.loom.task.ValidateMixinNameTask) {
        source(sourceSets.main.output)
    }

    check.dependsOn "validateMixinNames"