auto package.json version update

modules/mod/build.gradle.kts

@@ -1,8 +1,17 @@
 import com.github.gradle.node.npm.task.NpmTask
 import dev.adamko.factoriowebmap.configurations.asConsumer
 import dev.adamko.factoriowebmap.configurations.typescriptAttributes
+import groovy.json.JsonOutput
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import org.apache.tools.ant.filters.ReplaceTokens
+import org.gradle.kotlin.dsl.support.useToRun
 import org.jetbrains.kotlin.util.parseSpaceSeparatedArgs
+import org.jetbrains.kotlin.util.suffixIfNot
 
 plugins {
   idea
@@ -55,6 +64,55 @@ val tstlTask = tasks.register<NpmTask>("typescriptToLua") {
 
 }
 
+val updatePackageJsonVersion by tasks.registering {
+  group = project.name
+  description = """
+    Read the package.json file and set the version to be the project's version.
+  """.trimIndent()
+
+  val projectVersion = "${project.version}"
+  inputs.properties(
+    "projectVersion" to projectVersion,
+  )
+
+  val packageJsonFile = layout.projectDirectory.file("src/main/typescript/package.json")
+  outputs.file(packageJsonFile)
+
+  val jsonFormatter = Json {
+    prettyPrint = true
+    prettyPrintIndent = "  "
+  }
+
+  onlyIf {
+    val packageJsonContent = packageJsonFile.asFile.readText()
+    val packageJson = jsonFormatter.parseToJsonElement(packageJsonContent).jsonObject
+    packageJson["version"]?.jsonPrimitive?.content != projectVersion
+  }
+
+  doFirst {
+    delete(temporaryDir)
+    mkdir(temporaryDir)
+  }
+
+  doLast {
+    val packageJsonContent = packageJsonFile.asFile.readText()
+    val packageJson = jsonFormatter.parseToJsonElement(packageJsonContent).jsonObject
+    val packageJsonUpdate = JsonObject(
+      packageJson + ("version" to JsonPrimitive(projectVersion))
+    )
+    val packageJsonContentUpdated =
+      jsonFormatter
+        .encodeToString(packageJsonUpdate)
+        .suffixIfNot("\n")
+    packageJsonFile.asFile.writer().useToRun {
+      write(packageJsonContentUpdated)
+    }
+  }
+}
+
+tasks.assemble { dependsOn(updatePackageJsonVersion) }
+
+
 val dataModelTs: Configuration by configurations.creating {
   asConsumer()
   typescriptAttributes(objects)