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The natural counterpart to --diff-wcp (which compares two .wcp
archives) — operates on the unpacked side of the workflow. Shows
exactly what changed across zone.json fields, creature roster,
object placements, and quest list:
wowee_editor --diff-zone custom_zones/Base custom_zones/Variant
Diff: custom_zones/Base vs custom_zones/Variant
manifest : 2 field diff(s)
~ mapName: 'Base' -> 'Variant'
~ displayName: 'Base' -> 'Variant'
creatures : 2 vs 2
- Bear
+ Tiger
quests : 1 vs 2
+ Defeat the Tiger
Pairs naturally with --copy-zone: template a base zone, fork a
variant, then diff to see exactly what was customized. Useful for
PR review when a designer modifies a zone — diff against the
upstream version to scope the change.
Comparison strategy: sorted set diff on stable identifying fields
(creature.name, object.path, quest.title). This intentionally hides
position/orientation changes since those are continuous and would
flag every pixel-perfect tweak as a diff — content-level changes
are the signal here.
Exit 0 if identical, 1 otherwise (so CI can gate). JSON mode emits
per-category onlyA/onlyB arrays + manifestDiffs list + totalDiffs
count for programmatic consumption.
Verified: diffed two zones forked from a common base (one with
creature swap + new quest); reported 5 diffs across manifest +
creatures + quests with exit 1. Same zone vs itself reports
IDENTICAL with exit 0.