Added abjad.IndependentAfterGraceContainer. Tag #1125.

CHANGED. Cleaned up abjad.spanners.glissando() overrides.

    OLD: abjad.glissando() included spurious blocks like this on
    length-2 glissandi; these settings did nothing:

        \hide NoteHead
        \override Accidental.stencil = ##f
        \override NoteColumn.glissando-skip = ##t
        \override NoteHead.no-ledgers = ##t
        \revert Accidental.stencil
        \revert NoteColumn.glissando-skip
        \revert NoteHead.no-ledgers
        \undo \hide NoteHead

    NEW: abjad.glissando() no longer includes these blocks on length-2
    glissandi.

    REMOVED. Removed abjad.spanners.glissando(..., style=None) keyword.

        OLD: abjad.spanners.glissand(..., style="trill")
        NEW: Use abjad.Tweak(r"- \tweak style #'trill")

Makefile update: changed "make pytest" to "pytest tests". Newer versions
of pytest (eg, 8.1.1) error on "pytest ." because of duplicate
conftest.py, conf.py files in the abjad/abjad and abjad/tests.

    OLD: "make pytest" defined equal to "pytest ."
    NEW: "make pytest" defined equal to "pytest tests"

Makefile

@@ -80,18 +80,18 @@ mypy:
 project = abjad
 
 pytest:
-	pytest .
+	pytest tests
 
 pytest-coverage:
 	rm -Rf htmlcov/
 	pytest \
 	--cov-config=.coveragerc \
 	--cov-report=html \
 	--cov=${project} \
-	.
+	tests
 
 pytest-x:
-	pytest -x .
+	pytest -x tests
 
 reformat:
 	make black-reformat

abjad/__init__.py

@@ -232,6 +232,7 @@
     Container,
     Context,
     DrumNoteHead,
+    IndependentAfterGraceContainer,
     Leaf,
     MultimeasureRest,
     Note,
@@ -345,6 +346,7 @@
     "Harpsichord",
     "Horizontal",
     "ImpreciseMetronomeMarkError",
+    "IndependentAfterGraceContainer",
     "Infinity",
     "Instrument",
     "InstrumentName",

abjad/_getlib.py

@@ -177,6 +177,8 @@ def _get_effective(
 
 
 def _get_grace_container(component):
+    # _score.IndependentAfterGraceContainer is excluded here;
+    # exclusion allows iteration to work correctly
     prototype = (
         _score.AfterGraceContainer,
         _score.BeforeGraceContainer,

abjad/_iterlib.py

@@ -158,8 +158,12 @@ def _get_sibling_with_graces(component, n):
     candidate = component._parent[index]
     if n == 1 and getattr(candidate, "_before_grace_container", None):
         return candidate._before_grace_container[0]
+    if n == 1 and candidate.__class__.__name__ == "IndependentAfterGraceContainer":
+        return candidate[0]
     if n == -1 and getattr(candidate, "_after_grace_container", None):
         return candidate._after_grace_container[-1]
+    if n == -1 and candidate.__class__.__name__ == "IndependentAfterGraceContainer":
+        return candidate[-1]
     return candidate
 
 

abjad/_updatelib.py

@@ -65,6 +65,35 @@ def _get_before_grace_leaf_offsets(leaf):
     return start_offset, stop_offset
 
 
+def _get_independent_after_grace_leaf_offsets(leaf):
+    container = leaf._parent
+    main_leaf = container._sibling(-1)
+    main_leaf_stop_offset = main_leaf._stop_offset
+    assert main_leaf_stop_offset is not None
+    displacement = -leaf._get_duration()
+    sibling = leaf._sibling(1)
+    while sibling is not None and sibling._parent is container:
+        displacement -= sibling._get_duration()
+        sibling = sibling._sibling(1)
+    """
+    if leaf._parent is not None and leaf._parent._sibling(-1) is not None:
+        main_leaf = leaf._parent._sibling(-1)
+        sibling = main_leaf._sibling(1)
+        if (
+            sibling is not None
+            and hasattr(sibling, "_before_grace_container")
+            and sibling._before_grace_container is not None
+        ):
+            before_grace_container = sibling._before_grace_container
+            duration = before_grace_container._get_duration()
+            displacement -= duration
+    """
+    start_offset = _duration.Offset(main_leaf_stop_offset, displacement=displacement)
+    displacement += leaf._get_duration()
+    stop_offset = _duration.Offset(main_leaf_stop_offset, displacement=displacement)
+    return start_offset, stop_offset
+
+
 def _get_measure_start_offsets(component):
     wrappers = []
     prototype = _indicators.TimeSignature
@@ -323,9 +352,17 @@ def _update_component_offsets(component):
         start_offset = pair[0]
         pair = _get_after_grace_leaf_offsets(component[-1])
         stop_offset = pair[-1]
+    elif isinstance(component, _score.IndependentAfterGraceContainer):
+        pair = _get_independent_after_grace_leaf_offsets(component[0])
+        start_offset = pair[0]
+        pair = _get_independent_after_grace_leaf_offsets(component[-1])
+        stop_offset = pair[-1]
     elif isinstance(component._parent, _score.AfterGraceContainer):
         pair = _get_after_grace_leaf_offsets(component)
         start_offset, stop_offset = pair
+    elif isinstance(component._parent, _score.IndependentAfterGraceContainer):
+        pair = _get_independent_after_grace_leaf_offsets(component)
+        start_offset, stop_offset = pair
     else:
         previous = component._sibling(-1)
         if previous is not None:

abjad/configuration.py

@@ -578,6 +578,7 @@ def list_all_classes(modules="abjad", ignored_classes=None):
         <class 'abjad.score.Container'>
         <class 'abjad.score.Context'>
         <class 'abjad.score.DrumNoteHead'>
+        <class 'abjad.score.IndependentAfterGraceContainer'>
         <class 'abjad.score.Leaf'>
         <class 'abjad.score.MultimeasureRest'>
         <class 'abjad.score.Note'>