GP imports previously landed chord templates with blank fingerings (GP5 +
GP8) and blank names (GP8), so the editor/highway had nothing to show even
though E0 preserves and E1 authors that data. E3 extracts the real chord
diagrams so imports arrive rich, keyed on the same fret-pattern join key the
editor (E0) and GP5 already use.
GP8 (lib/gp2rs_gpx.py): parse the per-track GPIF DiagramCollection
(Item @name + Diagram Fret/Fingering) into a fret-pattern -> {name, fingers}
map and enrich matching played voicings at the template build site. Diagram
string indices share the note String index space, so they go through the same
pitch-rank transform; <Fret fret> is treated as absolute.
GP5 (lib/gp2rs.py): pyguitarpro exposes the voicing on beat.effect.chord
(.strings indexed 0=highest string, .fingerings the parallel Fingering enum,
already RS finger ints). New _chord_fingers maps them to RS string order; the
template enrich now back-fills any still-blank template so the annotated chord
attaches even when an earlier unannotated strum of the same voicing created it.
Finger encoding (none/open=-1, thumb=0, index=1, middle=2, ring=3, pinky=4)
matches the editor E1 + RS serializer. Only enriches on exact fret-pattern
match; diagram-less charts import identically (blank). Verified end-to-end
against real files (GP8_Test.gp, joplin-janis-piece_of_my_heart.gp4).
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
