CLI: library manager install latest if version is not specified

Author: Federico Fissore

app/src/processing/app/Base.java

@@ -370,7 +370,16 @@ protected void onProgress(Progress progress) {
 
       String[] libraryToInstallParts = parser.getLibraryToInstall().split(":");
 
-      ContributedLibrary selected = indexer.getIndex().find(libraryToInstallParts[0], VersionHelper.valueOf(libraryToInstallParts[1]).toString());
+      ContributedLibrary selected=null;
+      if (libraryToInstallParts.length == 2) {
+        selected = indexer.getIndex().find(libraryToInstallParts[0], VersionHelper.valueOf(libraryToInstallParts[1]).toString());
+      } else if (libraryToInstallParts.length == 1) {
+        List<ContributedLibrary> librariesByName = indexer.getIndex().find(libraryToInstallParts[0]);
+        Collections.sort(librariesByName, new DownloadableContributionVersionComparator());
+        if (!librariesByName.isEmpty()) {
+          selected = librariesByName.get(librariesByName.size() - 1);
+        }
+      }
       if (selected == null) {
         System.out.println(_("Selected library is not available"));
         System.exit(1);