Temporarily generate manifest for update site until v0.8.1 for the Gradle JOSM plugin is released

Signed-off-by: Taylor Smock <tsmock@fb.com>

build.gradle

@@ -1,9 +1,11 @@
 import groovy.xml.XmlParser
 import net.ltgt.gradle.errorprone.CheckSeverity
+import org.openstreetmap.josm.gradle.plugin.config.JosmManifest
 import org.openstreetmap.josm.gradle.plugin.task.GeneratePluginList
 
 import java.nio.file.Files
 import java.nio.file.Paths
+import java.util.stream.Collectors
 
 plugins {
   id "com.diffplug.spotless" version "6.3.0"
@@ -275,6 +277,47 @@ spotbugsMain {
   }
 }
 
+/**
+ * Create a manifest map
+ * @param manifest The manifest to convert
+ * @return The map
+ * @deprecated In v0.8.1 there will be a GenerateJarManifest class
+ */
+@Deprecated
+Map<String, String> createUpdateManifest(JosmManifest manifest) {
+  def returnMap = new TreeMap<String, String>();
+  // Required fields first
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_MIN_JOSM_VERSION, manifest.minJosmVersion, false)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_VERSION, project.version.toString(), false)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_MAIN_CLASS, manifest.mainClass, false)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_DESCRIPTION, manifest.description, false)
+  putIfNotNull(returnMap, JosmManifest.Attribute.AUTHOR, manifest.author)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_MIN_JAVA_VERSION, manifest.minJavaVersion)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_PLATFORM, manifest.platform)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_PROVIDES, manifest.provides)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_EARLY, manifest.loadEarly)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_ICON, manifest.iconPath)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_DEPENDENCIES, manifest.pluginDependencies)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_LOAD_PRIORITY, manifest.loadPriority)
+  putIfNotNull(returnMap, JosmManifest.Attribute.PLUGIN_CAN_LOAD_AT_RUNTIME, manifest.canLoadAtRuntime)
+
+  return returnMap
+}
+
+static putIfNotNull(Map<String, String> map, JosmManifest.Attribute attribute, Object value, boolean optional = true) {
+  if (value instanceof Provider) {
+    value = value.getOrNull()
+  }
+  if (value instanceof Collection) {
+    value = (value as Collection).stream().map(Object::toString).collect(Collectors.joining(";"))
+  }
+  if (value != null && !value.toString().trim().isEmpty()) {
+    map.put(attribute.manifestKey, value.toString());
+  } else if (!optional) {
+    throw new IllegalArgumentException("Attribute " + attribute.manifestKey + " cannot be null or empty");
+  }
+}
+
 task generateSnapshotUpdateSite(type: GeneratePluginList) {
   dependsOn(tasks.processResources)
 
@@ -289,7 +332,12 @@ task generateSnapshotUpdateSite(type: GeneratePluginList) {
         return "data:image/" + contentType + ";base64," + Base64.getEncoder().encodeToString(Files.readAllBytes(Paths.get(file.toURI())));
       }
     }
-    it.addPlugin("$archivesBaseName-dev.jar", project.josm.manifest.createJosmPluginJarManifest(), new URL(pluginDownloadUrl))
+    /**
+     * Generate a plugin jar manifest map
+     * @deprecated GenerateJarManifest.kt was added after v0.8.0
+     */
+    def manifest = createUpdateManifest(project.josm.manifest as JosmManifest)
+    it.addPlugin("$archivesBaseName-dev.jar", manifest, new URL(pluginDownloadUrl))
   }
 }