2.18

Abjad 2.18

Improvements

• [#715] Grace notes are now aware of their parentage above and beyond their enclosing GraceContainer.
• [#703] Added a synthetic_offset keyword to attach() and IndicatorExpression.
  • This allows composers to attach effective indicators which start before the score starts, allowing composers to model how various indicators hold over from a previous section.
  • For example: attach(Dynamic('f'), voice, synthetic_offset=-1)
• [#640] Many optimizations:
  • Optimized hot code paths in Duration and Offset instantiation.
  • Optimized timespan comparison.
  • Optimized parser instantiation.
• [#626, #726] Dynamic now recognizes sffp, sffz and niente as valid dynamic names.
• [#726] Hairpin is now niente-aware.
• [#628] Implemented a collection of command-line tools for working with score packages.
  • ajv score, ajv material, ajv segment, ajv target.
  • These tools are provisional pending more extensive use.
• [#719] Implemented TupletSpellingSpecifier.preferred_denominator.
  • This mirrors Tuplet.preferred_denominator.
• [#666] Abjad now formats LilyPond properties using the newer dot-chained syntax, not the old #'... syntax.
  • As always, Abjad targets the development version of LilyPond, currently the 2.19 series.
• [#720] Non-reduced fractions can be attached to leaves just like Multiplier objects.
• [#724] Equipped Sequence.partition_by_counts() with a reverse keyword.
• [#725] Equipped Markup with .sub() and .super() markup command methods.

Changes

• [#709] Spanners now attach only to leaves, never to containers.
  • This represents a significant simplification in Abjad's score model.
  • This change should generally be transparent to users, as attach() does the work of iterating leaves in its component expression.
• [#709] Many spanners now attach only to 2 or more leaves at once, including Slur and Tie.
• [#709] Removed Container.select_leaves().
  • To select a container's leaves, use list(iterate(container).by_leaf()).
  • To select the first leaf of a container, use next(iterate(container).by_leaf()).
  • To select the last leaf of a container, use next(iterate(container).by_leaf(reverse=True)).
• [#628, #644, #643, #702] Tool-chain clean-up and refactoring
  • developerscripttools was renamed commandlinetools.
  • DeveloperScript was renamed CommandlineScript.
  • Unused and obsolete scripts have been removed.
• [#717] Out-ported various classes to https://github.com/trevorbaca/baca:
  • Cursor, PitchClassTree, PayloadTree, CyclicPayloadTree.
• [#714] Selector.by_leaves() is now Selector.by_leaf(). This harmonizes with IterationAgent.by_leaf().
• [#721] Added a new LilyPondCommand.prefix property.
  • This makes it easy to position arbitrary strings relative to components.

Bugfixes

• [#655] Tuplet._simplify_redundant_tuplet() takes logical ties into account.
• [#680] Abjad's docs post-process SVG images under Python 2.7 properly.
• [#736] Registration now takes quarter tones into account.