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Lucas WintherandClaude Opus 5.5 97c64ebee8 feat: log tree from Module 2 (logTree / log_tree); SpellGrid CLIs print Log:

Engine events carry the nesting depth they were recorded at; the harness
prints the log as an indented tree. New tests test_02_log_tree_shows_nesting
and test_03_log_tree_death_phase; both SpellGrid CLIs print the tree of the
last command's Sequences under a Log: line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-11-11 10:23:59 +01:00

src

feat: log tree from Module 2 (logTree / log_tree); SpellGrid CLIs print Log:

2026-11-11 10:23:59 +01:00

.course.json

feat: module 08 push chains

2026-10-29 04:05:42 +01:00

.gitignore

feat: module 08 push chains

2026-10-29 04:05:42 +01:00

Cargo.lock

feat(ci): verify Expansion Drop solutions; README quick start, disclaimer link; Rust reference lockfiles

2026-10-29 19:13:11 +01:00

Cargo.toml

feat: module 08 push chains

2026-10-29 04:05:42 +01:00

README.md

fix(puzzle): an object steps once per movement phase; negated conversion is settled per object

2026-11-11 09:18:00 +01:00

README.md

Module 8 reference engine (Rust)

The course's own engine as of the end of Module 8. Part I's card engine is unchanged, and all of its tests still pass. The Part II engine in src/engine/puzzle/ now moves objects: each YOU object's move is planned in full, push chain and all, and only then committed. Module 7's reference was the starting point, so a diff between the two shows what this module adds.

cards/ (at the crate root; not in this directory): Part I's card data, a copy of course/cards/ staged by tools/verify-references.mjs. Part II doesn't read it.
src/engine/puzzle/: the Part II engine. It names no noun: the engine's own words are the operators IS, AND, NOT, the meta-noun TEXT, the property PUSH of the base rule TEXT IS PUSH, and from Module 8 the property YOU, which picks the objects that move.
- grid.rs: the level format, object kinds and the board. Module 8 adds Board::find, Board::remove, Board::shift, Board::at and Display for Kind (the kind as placed, for kinds_at).
- movement.rs (new): validate, then commit. Planner (try_move, staying_at, destroy, has), Step, Plan, Response and Dir. The planner reads the board and plans one step at a time; for each step it runs content's movement responses in order, and rolls back everything a step added if a response blocks it. The edge of the level blocks every step, and an object that has already stepped in the same move can't step again.
- level.rs: a level in play. Module 8 adds Level::move_you: the YOU objects move one at a time, furthest ahead first, each planned and then committed, and an object steps at most once per move (a YOU object that an earlier move carried along doesn't start its own); the rules are reparsed once at the end. has_property is false for a destroyed object.
- word.rs, parse.rs, resolve.rs: unchanged.
- mod.rs: the module's exports.
The rest of src/engine/: Part I, unchanged.
src/content/movement.rs (new) and src/content/mod.rs: the movement responses, in the order the engine runs them: OPEN/SHUT, PUSH, STOP. What a property does when something moves is content, not engine.
src/content/words.json: Module 8 adds OPEN and SHUT.
src/harness.rs: the adapter the course tests call. Module 8 adds Baba::move_dir, Baba::pos_of, Baba::kinds_at, and re-exports Dir.

Run it with the module's tests: node tools/verify-references.mjs 08 from the course repository.