Use Gradle Tooling API

model/build.gradle.kts

@@ -0,0 +1,15 @@
+plugins {
+    `embedded-kotlin`
+    kotlin("kapt")
+}
+
+repositories {
+    mavenCentral()
+    maven { url = uri("https://repo.gradle.org/gradle/libs-releases") }
+}
+
+dependencies {
+    compileOnly("com.squareup.moshi:moshi:1.8.0")
+    compileOnly("com.squareup.okio:okio:2.2.2")
+    kapt("com.squareup.moshi:moshi-kotlin-codegen:1.8.0")
+}

model/gradle/dependency-locks/compileClasspath.lockfile

@@ -0,0 +1,10 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.squareup.moshi:moshi:1.8.0
+com.squareup.okio:okio:2.2.2
+org.jetbrains.kotlin:kotlin-reflect:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib:1.3.21
+org.jetbrains:annotations:13.0

model/gradle/dependency-locks/runtimeClasspath.lockfile

@@ -0,0 +1,3 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.

model/gradle/dependency-locks/testCompileClasspath.lockfile

@@ -0,0 +1,8 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+org.jetbrains.kotlin:kotlin-reflect:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib:1.3.21
+org.jetbrains:annotations:13.0

model/gradle/dependency-locks/testRuntimeClasspath.lockfile

@@ -0,0 +1,8 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+org.jetbrains.kotlin:kotlin-reflect:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21
+org.jetbrains.kotlin:kotlin-stdlib:1.3.21
+org.jetbrains:annotations:13.0

model/src/main/kotlin/org/nixos/gradle2nix/Impl.kt

@@ -0,0 +1,117 @@
+package org.nixos.gradle2nix
+
+import com.squareup.moshi.JsonClass
+import java.io.Serializable
+
+@JsonClass(generateAdapter = true)
+data class DefaultBuild(
+    override val gradle: DefaultGradle,
+    override val pluginDependencies: DefaultDependencies,
+    override val rootProject: DefaultProject,
+    override val includedBuilds: List<DefaultIncludedBuild>
+) : Build, Serializable {
+    constructor(model: Build) : this(
+        DefaultGradle(model.gradle),
+        DefaultDependencies(model.pluginDependencies),
+        DefaultProject(model.rootProject),
+        model.includedBuilds.map { DefaultIncludedBuild(it) }
+    )
+}
+
+@JsonClass(generateAdapter = true)
+data class DefaultIncludedBuild(
+    override val name: String,
+    override val projectDir: String
+) : IncludedBuild, Serializable {
+    constructor(model: IncludedBuild) : this(
+        model.name,
+        model.projectDir
+    )
+}
+
+@JsonClass(generateAdapter = true)
+data class DefaultGradle(
+    override val version: String,
+    override val type: String,
+    override val url: String,
+    override val sha256: String,
+    override val nativeVersion: String
+) : Gradle, Serializable {
+    constructor(model: Gradle) : this(
+        model.version,
+        model.type,
+        model.url,
+        model.sha256,
+        model.nativeVersion
+    )
+}
+
+@JsonClass(generateAdapter = true)
+data class DefaultProject(
+    override val name: String,
+    override val path: String,
+    override val projectDir: String,
+    override val buildscriptDependencies: DefaultDependencies,
+    override val projectDependencies: DefaultDependencies,
+    override val children: List<DefaultProject>
+) : Project, Serializable {
+    constructor(model: Project) : this(
+        model.name,
+        model.path,
+        model.projectDir,
+        DefaultDependencies(model.buildscriptDependencies),
+        DefaultDependencies(model.projectDependencies),
+        model.children.map { DefaultProject(it) }
+    )
+}
+
+@JsonClass(generateAdapter = true)
+data class DefaultDependencies(
+    override val repositories: DefaultRepositories,
+    override val artifacts: List<DefaultArtifact>
+) : Dependencies, Serializable {
+    constructor(model: Dependencies) : this(
+        DefaultRepositories(model.repositories),
+        model.artifacts.map { DefaultArtifact(it) }
+    )
+}
+
+@JsonClass(generateAdapter = true)
+data class DefaultRepositories(
+    override val maven: List<DefaultMaven>
+) : Repositories, Serializable {
+    constructor(model: Repositories) : this(
+        model.maven.map { DefaultMaven(it) }
+    )
+}
+
+@JsonClass(generateAdapter = true)
+data class DefaultMaven(
+    override val urls: List<String>
+) : Maven, Serializable {
+    constructor(model: Maven) : this(
+        model.urls.toList()
+    )
+}
+
+@JsonClass(generateAdapter = true)
+data class DefaultArtifact(
+    override val groupId: String,
+    override val artifactId: String,
+    override val version: String,
+    override val classifier: String,
+    override val extension: String,
+    override val sha256: String
+) : Artifact, Comparable<DefaultArtifact>, Serializable {
+    constructor(model: Artifact) : this(
+        model.groupId,
+        model.artifactId,
+        model.version,
+        model.classifier,
+        model.extension,
+        model.sha256
+    )
+
+    override fun toString() = "$groupId:$artifactId:$version:$classifier:$extension"
+    override fun compareTo(other: DefaultArtifact): Int = toString().compareTo(other.toString())
+}

model/src/main/kotlin/org/nixos/gradle2nix/Model.kt

@@ -0,0 +1,52 @@
+package org.nixos.gradle2nix
+
+interface Build {
+    val gradle: Gradle
+    val pluginDependencies: Dependencies
+    val rootProject: Project
+    val includedBuilds: List<IncludedBuild>
+}
+
+interface IncludedBuild {
+    val name: String
+    val projectDir: String
+}
+
+interface Gradle {
+    val version: String
+    val type: String
+    val url: String
+    val sha256: String
+    val nativeVersion: String
+}
+
+interface Project {
+    val name: String
+    val path: String
+    val projectDir: String
+    val buildscriptDependencies: Dependencies
+    val projectDependencies: Dependencies
+    val children: List<Project>
+}
+
+interface Dependencies {
+    val repositories: Repositories
+    val artifacts: List<Artifact>
+}
+
+interface Repositories {
+    val maven: List<Maven>
+}
+
+interface Maven {
+    val urls: List<String>
+}
+
+interface Artifact {
+    val groupId: String
+    val artifactId: String
+    val version: String
+    val classifier: String
+    val extension: String
+    val sha256: String
+}