TOML: dedicated plugin to format and sort libs.versions.toml files in Gradle projects

[mkutz]

I'd like to have a layout step that formates and also sorts TOML files.

• proper spacing around special characters
  E.g. kotlin-jvm={id="org.jetbrains.kotlin.jvm",version="2.3.21"} → kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version = "2.3.21" } or assertj="3.27.7" → assertj = "3.27.7"
• line breaks for long definitions
• sort standard version catalog tables:
  1. [versions]
  2. [libraries]
  3. [bundles]
  4. [plugins]
• sort table entries alphabetically simply by line, hence the chose alias will determine the order

Example

Unformatted:

[versions]
assertj="3.27.7"
testcontainers= "2.0.5"
junit ="6.0.3"

[libraries]
junit-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api" }
junit-jupiter-engine = {module = "org.junit.jupiter:junit-jupiter-engine"}
junit-jupiter-params = { module = "org.junit.jupiter:junit-jupiter-params" }
junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher" }
assertj-core = { module = "org.assertj:assertj-core", version.ref="assertj" }
testcontainers-junit-jupiter= { module = "org.testcontainers:testcontainers-junit-jupiter", version.ref = "testcontainers" }
testcontainers-postgresql ={ module = "org.testcontainers:testcontainers-postgresql", version.ref = "testcontainers" }

[plugins]
sonar = { id = "org.sonarqube", version= "7.3.0.8198" }
spotless = { id = "com.diffplug.spotless", version= "7.2.1" }
kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version = "2.3.21" }

[bundles]
junit = ["junit-jupiter-api","junit-jupiter-params"]

Formatted:

[versions]
assertj = "3.27.7"
junit = "6.0.3"
testcontainers = "2.0.5"

[libraries]
assertj-core = { module = "org.assertj:assertj-core", version.ref = "assertj" }
junit-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api" }
junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine" }
junit-jupiter-params = { module = "org.junit.jupiter:junit-jupiter-params" }
junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher" }
testcontainers-junit-jupiter = { module = "org.testcontainers:testcontainers-junit-jupiter", version.ref = "testcontainers" }
testcontainers-postgresql = { module = "org.testcontainers:testcontainers-postgresql", version.ref = "testcontainers" }

[bundles]
junit = [ "junit-jupiter-api", "junit-jupiter-params" ]

[plugins]
kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version = "2.3.21" }
sonar = { id = "org.sonarqube", version = "7.3.0.8198" }
spotless = { id = "com.diffplug.spotless", version = "7.2.1" }

I'd be happy to provide a PR for this. I already have a general proof of concept implemented as a custom step... needs some more work, though.