Mention dynamically-evaluated templates whilst copying static files (#12726)

CHANGES.rst

@@ -16,6 +16,9 @@ Deprecated
 Features added
 --------------
 
+* #11328: Mention evaluation of templated content during production of static
+  output files.
+
 Bugs fixed
 ----------
 

sphinx/builders/html/__init__.py

@@ -908,7 +908,7 @@ class StandaloneHTMLBuilder(Builder):
 
     def copy_static_files(self) -> None:
         try:
-            with progress_message(__('copying static files')):
+            with progress_message(__('copying static files'), nonl=False):
                 ensuredir(self.outdir / '_static')
 
                 # prepare context for templates
@@ -929,7 +929,7 @@ class StandaloneHTMLBuilder(Builder):
     def copy_extra_files(self) -> None:
         """Copy html_extra_path files."""
         try:
-            with progress_message(__('copying extra files')):
+            with progress_message(__('copying extra files'), nonl=False):
                 excluded = Matcher(self.config.exclude_patterns)
                 for extra_path in self.config.html_extra_path:
                     copy_asset(

sphinx/util/fileutil.py

@@ -81,6 +81,9 @@ def copy_asset_file(source: str | os.PathLike[str], destination: str | os.PathLi
 
         destination = _template_basename(destination) or destination
         with open(destination, 'w', encoding='utf-8') as fdst:
+            msg = __('Writing evaluated template result to %s')
+            logger.info(msg, os.fsdecode(destination), type='misc',
+                        subtype='template_evaluation')
             fdst.write(rendered_template)
     else:
         copyfile(source, destination, force=force)

tests/test_util/test_util_fileutil.py

@@ -1,5 +1,6 @@
 """Tests sphinx.util.fileutil functions."""
 
+import re
 from unittest import mock
 
 import pytest
@@ -119,6 +120,14 @@ def test_copy_asset(tmp_path):
     assert not (destdir / '_templates' / 'sidebar.html').exists()
 
 
+@pytest.mark.sphinx('html', testroot='html_assets')
+def test_copy_asset_template(app):
+    app.build(force_all=True)
+
+    expected_msg = r"^Writing evaluated template result to [^\n]*\bAPI.html$"
+    assert re.findall(expected_msg, strip_colors(app.status.getvalue()), flags=re.MULTILINE)
+
+
 @pytest.mark.sphinx('html', testroot='util-copyasset_overwrite')
 def test_copy_asset_overwrite(app):
     app.build()