Merge "Add --unused parameter to whichgit" into main am: e0c74fbdd6

Original change: https://android-review.googlesource.com/c/platform/build/+/3056687

Change-Id: I80eec79743db7fa7016a39142c3249492c6b7c55
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

tools/whichgit

@@ -50,7 +50,7 @@ def get_referenced_projects(git_dirs, files):
         referenced_dirs.add(d)
         prev_dir = d
         break
-  return [d[0:-1] for d in referenced_dirs]
+  return referenced_dirs
 
 
 def main(argv):
@@ -63,9 +63,11 @@ def main(argv):
                   help="The TARGET_BUILD_VARIANTS to check. If not provided just uses whatever has"
                         + " already been built, or eng if --products is supplied")
   ap.add_argument("--modules", nargs="*",
-                  help="The build modules to check, or droid it not supplied")
+                  help="The build modules to check, or droid if not supplied")
   ap.add_argument("--why", nargs="*",
                   help="Also print the input files used in these projects, or \"*\" for all")
+  ap.add_argument("--unused", help="List the unused git projects for the given modules rather than"
+                        + "the used ones. Ignores --why", action="store_true")
   args = ap.parse_args(argv[1:])
 
   modules = args.modules if args.modules else ["droid"]
@@ -92,12 +94,18 @@ def main(argv):
 
   sources = sorted(sources)
 
+  if args.unused:
+    # Print the list of git directories that don't contain sources
+    used_git_dirs = set(get_git_dirs())
+    for project in sorted(used_git_dirs.difference(set(get_referenced_projects(used_git_dirs, sources)))):
+      print(project[0:-1])
+  else:
     # Print the list of git directories that has one or more of the sources in it
     for project in sorted(get_referenced_projects(get_git_dirs(), sources)):
-    print(project)
+      print(project[0:-1])
       if args.why:
-      if "*" in args.why or project in args.why:
+        if "*" in args.why or project[0:-1] in args.why:
-        prefix = project + "/"
+          prefix = project
           for f in sources:
             if f.startswith(prefix):
               print("  " + f)