add length to progress bar

so progress bar shows real progress

Signed-off-by: Miroslav Suchý <msuchy@redhat.com>

Author: xsuchy

CHANGELOG.rst

@@ -50,6 +50,8 @@ v33.0.0 (next next, roadmap)
 - Update ABOUT files to adapt the ABOUT File Specification.
   See https://github.com/aboutcode-org/scancode-toolkit/issues/4181
 
+- Progress bar now shows length. You can estimate the duration now.
+  See https://github.com/aboutcode-org/scancode-toolkit/issues/3342
 
 v32.3.3 - 2025-03-06
 --------------------

src/scancode/cli.py

@@ -1252,6 +1252,8 @@ def scan_codebase(
 
     # NOTE: we never scan directories
     resources = ((r.location, r.path) for r in codebase.walk() if r.is_file)
+    if progress_manager:
+        resources = list(resources)
 
     use_threading = processes >= 0
     runner = partial(
@@ -1287,6 +1289,8 @@ def scan_codebase(
 
         if progress_manager:
             scans = progress_manager(scans)
+            # times two because of #3344
+            scans.length = len(resources)*2
             # hack to avoid using a context manager
             if hasattr(scans, '__enter__'):
                 scans.__enter__()