Deprecate installer & use KBootstrap for updating

buildSrc/src/main/groovy/kcauldron/InstallBundle.groovy

@@ -2,14 +2,26 @@ package kcauldron
 
 import org.gradle.api.DefaultTask
 import org.gradle.api.GradleException
-import org.gradle.api.tasks.InputFile
-import org.gradle.api.tasks.OutputDirectory
-import org.gradle.api.tasks.TaskAction
-import org.gradle.api.tasks.incremental.IncrementalTaskInputs
+import org.gradle.api.file.ConfigurableFileCollection
+import org.gradle.api.tasks.*
 
 class InstallBundle extends DefaultTask {
     @InputFile
-    def File installer
+    def File serverJar
+
+    @InputFiles
+    def ConfigurableFileCollection bootstrapClasspath
+
+    @Input
+    def String bootstrapMain
+
+    InstallBundle() {
+        bootstrapClasspath = project.files()
+    }
+
+    def bootstrapClasspath(Object... args) {
+        bootstrapClasspath.from args
+    }
 
     @OutputDirectory
     def File getInstallLocation() {
@@ -20,14 +32,40 @@ class InstallBundle extends DefaultTask {
     def install() {
         installLocation.deleteDir()
         installLocation.mkdirs()
+        new File(installLocation, "README.txt").withWriter {
+            def String jarPath = 'bin/' << (project.group as String).replace('.', File.separator) << File.separator << project.name << File.separator << project.version << File.separator << project.name << '-' << project.version << '.jar'
+
+            it << '''KCauldron installation guide
+
+# Understanding this bundle
+You're reading this guide because you're using deprecated installation method
+If you want use easier & safer method please read about KBootstrap at https://prok.pw/KBootstrap
+
+# Installation and usage
+1. Unpack this zip into server directory
+2. Use following line to start the server:
+  java -jar '''
+            it << jarPath
+            it << '''
+3. That's end, enjoy
+
+# Why I should use KBootstrap?
+1. Easiest server installation
+2. Built-in libraries management
+3. Update & run server in one line
+4. Ability to not read this boring guide
+5. What else?
+If you are not yet convinced and want to use bundles instead KBootstrap... Meh, this is your choice.
+'''
+        }
+        def cp = bootstrapClasspath
         for (int i = 0; i < 3; i++) {
-            def result = project.javaexec {
+            def result = project.javaexec { it ->
                 workingDir installLocation
-                classpath installer
-                main 'net.minecraftforge.installer.SimpleInstaller'
-                args '--installServer'
-                standardOutput new NopOutputStream()
-                errorOutput new NopOutputStream()
+                classpath cp
+                main bootstrapMain
+                args '--serverDir', installLocation.canonicalPath,
+                        '--installServer', serverJar.canonicalFile
             }
             if (result.exitValue == 0) return
         }