Offline builds and fix buildscript entrypoint

I am not sure how the buildscript entrypoint worked at some point,
but then it didn't work anymore because it couldn't resolve the buildscript
class. Thus, we will compile that class if it was not found

brachyura/pom.xml

@@ -5,7 +5,7 @@
 
     <groupId>io.github.coolcrabs</groupId>
     <artifactId>brachyura</artifactId>
-    <version>0.76.0</version>
+    <version>0.76.1</version>
 
     <properties>
         <java.version>1.8</java.version>

brachyura/src/main/java/io/github/coolcrabs/brachyura/plugins/Plugins.java

@@ -9,7 +9,7 @@ public class Plugins {
     private Plugins() { }
 
     static ArrayList<Plugin> plugins = new ArrayList<>();
-    
+
     static {
         plugins.add(ProfilePlugin.INSTANCE); // TODO: real plugin loading
     }

brachyura/src/main/java/io/github/coolcrabs/brachyura/project/BuildscriptDevEntry.java

@@ -19,12 +19,20 @@ public static void main(String[] args) throws Throwable {
         try {
             EntryGlobals.projectDir = Paths.get(args[0]);
             EntryGlobals.buildscriptClasspath = Arrays.stream(args[1].split(File.pathSeparator)).map(Paths::get).collect(Collectors.toList());
-            Project buildscript = (Project) Class.forName("Buildscript").getDeclaredConstructor().newInstance();
+
+            Project buildscript;
+            try {
+                buildscript = (Project) Class.forName("Buildscript").getDeclaredConstructor().newInstance();
+            } catch (ClassNotFoundException cnfe) {
+                buildscript = new BuildscriptProject().createProject().get();
+            }
+            // "finalBuildscript" is just "buildscript" but local-class friendly
+            Project finalBuildscript = buildscript;
             BuildscriptProject buildscriptProject = new BuildscriptProject() {
                 @Override
-                public Optional<Project> createProject() {
-                    return Optional.of(buildscript);
-                }
+                public java.util.Optional<Project> createProject() {
+                    return Optional.of(finalBuildscript);
+                };
             };
             buildscript.setIdeProject(buildscriptProject);
             Tasks t = new Tasks();

build/src/main/java/io/github/coolcrabs/brachyura/build/Main.java

@@ -149,11 +149,15 @@ public static void main(String[] args) throws Exception {
             for (String lib : mavenLibs) {
                 boolean isJar = !lib.endsWith("-sources.jar");
                 String filename = lib.substring(lib.lastIndexOf('/') + 1);
-                HttpURLConnection connection = (HttpURLConnection) new URL(lib + ".sha1").openConnection();
-                connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2"); // hydos moment
                 String hash;
-                try (InputStream is = connection.getInputStream()) {
-                    hash = readFullyAsString(is);
+                if (!Boolean.getBoolean("de.geolykt.starloader.brachyura.build.offline")) {
+                    HttpURLConnection connection = (HttpURLConnection) new URL(lib + ".sha1").openConnection();
+                    connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2"); // hydos moment
+                    try (InputStream is = connection.getInputStream()) {
+                        hash = readFullyAsString(is);
+                    }
+                } else {
+                    hash = "offline-build";
                 }
                 bootstrapConfigWriter.write(lib + "\t" + hash + "\t" + filename + "\t" + isJar + "\n");
             }

offline-build.bash

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+cd brachyura
+mvn clean package verify -Dmaven.test.skip=true --offline
+cd ..
+cd bootstrap
+mvn clean package verify -Dmaven.test.skip=true --offline
+cd ..
+cd build
+mvn clean package verify -Dmaven.test.skip=true --offline
+java -Dde.geolykt.starloader.brachyura.build.offline=true -jar ./target/brachyura-build-0.jar
+cd ..