Crate lattice_listing 

Filesystem entry listings as buffers — the two views the editor offers over a directory tree.

• oil — a flat, editable listing of one directory (oil.nvim-style). :w diffs the rope against a snapshot and executes the renames / deletes / creates it implies.
• file_tree — a hierarchical, read-only tree with expand/collapse.

Why one crate (DL.0)

These shipped as lattice-oil and lattice-file-tree and were merged, because they are the same domain seen twice rather than two features that happen to be adjacent:

• no consumer ever took one without the other — lattice-host and both renderers depend on both, so the split bought no modularity anyone used;
• both carried a directory reader of near-identical shape (DL.7 converged them onto dir::read_dir_sorted);
• their entry models (oil::OilEntry, file_tree::FileTreeEntry) are one concept in two shapes.

That duplication is what let a single arithmetic slip live in four paint paths (CV.5) and is what the directory-listing-mode work (see docs/dev/architecture/directory-listing-mode.md) exists to remove: one minor mode, activated on both majors, owning the icons and the theme-rooted highlighting they both need.

What deliberately did NOT converge (DL.7)

The merge’s stated debt was “two directory readers, two rope renderers, two entry models”. Only the first was real:

• Entry models stay separate. file_tree::FileTreeEntry carries depth and expansion state because a tree has both; oil::OilEntry is a flat, editable row and has neither. Merging them would either bloat oil with fields that mean nothing there, or drop the state the tree needs — and the shared shape they both project into already exists (listing_mode::ListingEntry), which is what the presentation layer consumes. There is nothing left to unify.
• Rope renderers stay separate. Oil’s is bare names joined by newlines, because :w diffs that text back into filesystem operations; the tree’s is indent + expand marker + name. Two formats, deliberately. What actually mattered — that neither embeds icons — is already true, and is what let both move to the shared paint path.

Recorded because “three duplications” reads like unfinished work otherwise. Two of the three were never duplication.

The merge itself changed no behaviour. The duplicated readers, renderers and entry models are still duplicated here, deliberately — converging them is DL.6, and folding it into the move would have made the move unreviewable. See the slice plan.

Re-exports

pub use install::install;

Modules

dir

One directory read, shared by both listing majors.

file_tree

File-tree buffer (DESIGN.md §5.9 buffer-as-content).

install

LM.3: boot-wiring for the listing crate — its modes and the oil chord command declarations.

listing_mode

directory-listing-mode — the minor mode both listing majors share, owning entry presentation.

oil

Flat directory listing buffer — oil.nvim-style editable view.