build scripts: added to gant files

build/scripts/tests_in_community.gant

@@ -17,6 +17,10 @@ import org.jetbrains.intellij.build.TestingTasks
 import org.jetbrains.intellij.build.impl.CompilationContextImpl
 import org.jetbrains.jps.idea.IdeaProjectLoader
 
+/**
+ * Compiles the sources and runs tests from 'community' project. Look at org.jetbrains.intellij.build.TestingOptions to see which options are
+ * supported.
+ */
 target("default": "Run tests") {
   String home = IdeaProjectLoader.guessHome(this)
   String outputDir = "$home/out/tests"

platform/build-scripts/groovy/org/jetbrains/intellij/build/package.html

@@ -10,6 +10,9 @@ If you want to build a product from sources locally, run the corresponding *.gan
   system property to build artifacts only for a specific OS, and set {@linkplain org.jetbrains.intellij.build.BuildOptions#buildStepsToSkip 'intellij.build.skip.build.steps'}
   system property to skip some long build steps (e.g. scrambling). See {@link org.jetbrains.intellij.build.BuildOptions BuildOptions} class for more options.
 </p>
+<p>
+  In order to run a gant script without IntelliJ IDEA you can use build/gant.xml Ant file and pass path to the gant script via gant.script property.
+</p>
 <p>
   If you want to add a new module to an existing product, add its name to {@link org.jetbrains.intellij.build.ProductModulesLayout#platformApiModules
   platformApiModules/platformImplementationModules}. If the module is part of IntelliJ Platform and needs to be included into all products