[build scripts] restore IdeaProjectLoader class which are still used in *.gant scripts

...via jps-build-script-dependencies-bootstrap library. It was deleted in d63b2fa6bb by mistake.

GitOrigin-RevId: 50beb93ddf812f60f363560318c3e7e3e2f4ef3a

jps/standalone-builder/src/org/jetbrains/jps/idea/IdeaProjectLoader.java

@@ -0,0 +1,36 @@
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package org.jetbrains.jps.idea;
+
+import groovy.lang.Script;
+import org.jetbrains.jps.model.serialization.PathMacroUtil;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+/**
+ * @author max
+ */
+public class IdeaProjectLoader {
+  /**
+   * This method is still used in some *.gant scripts via jps-build-script-dependencies-bootstrap library
+   */
+  @SuppressWarnings("unused")
+  public static String guessHome(Script script) throws IOException, URISyntaxException {
+    String uri = (String)script.getProperty("gant.file");
+    File home = new File(new URI(uri).getSchemeSpecificPart());
+
+    while (home != null) {
+      if (home.isDirectory() && new File(home, PathMacroUtil.DIRECTORY_STORE_NAME).exists()) {
+        return home.getCanonicalPath();
+      }
+
+
+      home = home.getParentFile();
+    }
+
+
+    throw new IllegalArgumentException("Cannot guess project home from '" + uri + "'");
+  }
+}