Fix the module name is not extracted when the path to the module cont…

…ains spaces (#6)

When `MainClassModuleNameExtractor` is run in external JVM a file with
arguments for the JVM is created. This file contains the paths to the
modules but if those paths contain spaces they are not properly escaped
and as a result `MainClassModuleNameExtractor` receives corrupted paths
as arguments.

Quote all paths in the file so spaces are handled properly.

plexus-java/src/main/java/org/codehaus/plexus/languages/java/jpms/MainClassModuleNameExtractor.java

@@ -78,7 +78,11 @@ public <T> Map<T, String> extract( Map<T, Path> files )
 
             for ( Path p : files.values() )
             {
-                argsWriter.append( p.toAbsolutePath().toString() );
+                // make sure the path is surrounded with quotes in case there is space
+                argsWriter.append( '"' );
+                // make sure to escape Windows paths
+                argsWriter.append( p.toAbsolutePath().toString().replace( "\\", "\\\\" ) );
+                argsWriter.append( '"' );
                 argsWriter.newLine();
             }
         }

plexus-java/src/test/java/org/codehaus/plexus/languages/java/jpms/AbstractFilenameModuleNameExtractorTest.java

@@ -60,4 +60,11 @@ public void testJarUnsupported() throws Exception
         assertEquals( null, name );
     }
 
+    @Test
+    public void testJarWithSpacesInPath() throws Exception
+    {
+        String name = getExtractor().extract( Paths.get( "src/test/resources/jar with spaces in path/plexus-java-1.0.0-SNAPSHOT.jar" ) );
+        assertEquals( "org.codehaus.plexus.languages.java", name );
+    }
+
 }