helper.gradle

import java.text.MessageFormat


ext.newFile = {File parent, String... childs ->
	for (String child : childs) {
		parent = new File(parent, child);
	}
	return parent;
}


class UpdateLibrariesTask extends DefaultTask {
	File directory
	List<Map> libraries
	Set<String> manualLibraries = new HashSet<>();

	@TaskAction
	def update() {
		Set<String> librariesNames = new HashSet<>()

		libraries.each({
			String url = it.get("url")
			String libraryName = it.get("name")

			librariesNames.add(libraryName)

			File libraryFile = new File(directory, libraryName)
			if (!libraryFile.exists()) {
				logger.lifecycle(MessageFormat.format("Downloading library {0} from {1}", libraryName, url))
				ant.get(src: url, dest: libraryFile)
			} else {
				logger.lifecycle(MessageFormat.format("Skipping download of library {0} because it already exists", libraryName))
			}
		})

		directory.listFiles()
		.findAll({
			!librariesNames.contains(it.getName()) && !manualLibraries.contains(it.getName())
		})
		.each({
			logger.lifecycle(MessageFormat.format("Deleting old library {0}", it.getName()))
			it.delete()
		})
	}

}

ext.UpdateLibrariesTask = UpdateLibrariesTask


class BuildLibraryTask extends DefaultTask {
	File targetDirectory
	String targetLibraryName
	String builderUrl
	String buildCommand
	String[] builtLibraryName
	String builderName = "library_builder"

	@TaskAction
	def update() {
		File libraryFile = new File(targetDirectory, targetLibraryName)
		File buildDirectory = new File(new File("build_libraries"), targetLibraryName)
		buildDirectory.mkdirs()
		if (!libraryFile.exists()) {
			logger.lifecycle(MessageFormat.format("Building library {0} from {1}", targetLibraryName, builderUrl))
			File builder = new File(buildDirectory, builderName)
			ant.get(src: builderUrl, dest: builder)
			getProject().exec {
				workingDir = buildDirectory
				commandLine = buildCommand.replace("{BUILDER}", builderName).split("\\s+")
			}
			java.nio.file.Files.copy(
				getProject().newFile(buildDirectory, builtLibraryName).getAbsoluteFile().toPath(),
				libraryFile.getAbsoluteFile().toPath()
			)
		} else {
			logger.lifecycle(MessageFormat.format("Skipping building of library {0} because it already exists", targetLibraryName))
		}
	}
}

ext.BuildLibraryTask = BuildLibraryTask