Marlin ― Delivery Road‑map v3.2

Engineering‑ready – revised 2025‑05‑18

Legend △ engineering artefact ✦ user‑visible deliverable

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0 · Methodology primer  (what “Done” means)

Theme	Project rule‑of‑thumb
Branching	Trunk‑based. Feature branch → PR → 2 reviews → squash‑merge.
Spec first	Each epic begins with a Design Proposal (DP‑xxx) in /docs/adr/ containing schema diffs, example CLI session, perf targets.
Coverage	Tarpaulin gate ≥ 85 % on lines touched this sprint (checked in CI).
Perf gate	Cold‑start P95 ≤ 3 s on 100 k files unless overridden in DP. Regressions fail CI.
Docs	CLI flags & examples land in README.md same PR. Docs tables (CLI cheatsheet, TUI key‑map) are auto‑generated during the build.
Demo	Closing each epic yields a ≤ 2‑min asciinema or GIF in docs/demos/.

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1 · Bird’s‑eye table (engineering details + deliverables)

Phase / Sprint	Timeline	Focus & Rationale	✦ Key UX Deliverables	△ Engineering artefacts / tasks	Definition of Done
Sprint 0 — Bootstrap & CI Baseline	2025‑Q2 (now → 30 May)	CI scaffolding, coverage, crate split	—	• Split repo into libmarlin (core) + cli-bin + tui-bin • Tarpaulin coverage + Hyperfine perf jobs wired • build.rs renders CLI cheatsheet from commands.yaml • Docs / cheatsheet autogen step in GitHub Actions	cargo test --all passes with coverage gate ≥ 85 %; docs artefacts appear in build; crates compile.
Sprint α — Bedrock & Metadata Domains	31 May → 13 Jun 2025	Lock schema v1.1, first metadata objects	• CLI stubs: marlin link / coll / view • marlin demo interactive tour	• DP‑001 Schema v1.1 (ER + migration scripts) • Unit tests (escape_fts, determine_scan_root) • GitHub Action for SQL dry‑run	100 % migrations green; demo prints ✅; logo badge shows schema version.
Epic 1 — Live‑Watch Mode & Backup Prune	2025‑Q2	Continuous indexing via FS events; backups never explode	• marlin watch <dir> (inotify / FSEvents) • backup --prune N (auto‑prune pre‑ and post‑command)	• DP‑002 file‑watch life‑cycle & debounce strategy • Change‑table schema storing dirty file IDs • Nightly prune CI job	8 h stress‑watch alters 10 k files → < 1 % missed; backup dir size ≤ N; watch CPU idle < 3 %.
Epic 2 — Dirty‑scan optimisation	2025‑Q2	Re‑index only paths marked dirty by watch table	• scan --dirty	• Reuse change‑table from watch; Hyperfine benchmark script committed	Dirty‑scan runtime ≤ 15 % full scan on 100 k corpus; bench job passes.
Phase 3 — Content FTS + Annotations	2025‑Q3	Grep snippets, inline notes	• search -C3 grep‑style context • annotate add/list	• DP‑004 content‑blob strategy (inline vs ext‑table) • syntect highlight PoC	Indexes 1 GB corpus ≤ 30 min; snippet CLI golden tests pass.
Phase 4 — Versioning & De‑duplication	2025‑Q3	Historic diffs, SHA‑256 dedupe	• scan --rehash • version diff <file>	• DP‑005 hash column + Bloom‑de‑dupe research	Diff on 10 MB file ≤ 500 ms; duplicate sets emitted by CLI.
Phase 5 — Tag Aliases & Semantic Booster	2025‑Q3	Tame tag sprawl; start AI hints	• tag alias add/ls/rm • tag suggest, summary	• DP‑006 embeddings size & k‑NN search bench	95 % alias look‑ups resolved in one hop; suggest query ≤ 150 ms.
Phase 6 — Search DSL v2 & Smart Views	2025‑Q4	AND/OR, ranges, structured grammar; smart folders	• New nom grammar • Legacy parser behind --legacy-search (warn on use)	• DP‑007 BNF + 30 acceptance strings • Lexer fuzz tests (cargo‑fuzz)	Old queries keep working; 0 panics in fuzz run ≥ 1 M cases.
Phase 7 — Structured Workflows & Templates	2025‑Q4	State graph, relationship templates	• state set/log • template apply	• DP‑008 workflow tables & YAML template spec • Sample template e2e tests	Create template, apply to 20 files → all attrs/link rows present; illegal transitions blocked.
Phase 8 — TUI v1 + Lightweight Integrations	2026‑Q1	Keyboard UI, VS Code sidebar	• marlin‑tui binary (tiling panes, key‑map) • Read‑only VS Code sidebar	• DP‑009 TUI redraw budget & key‑map • Crate split fully consumed	TUI binary ≤ 2 MB; scroll redraw ≤ 4 ms; VS Code extension loads index.
Phase 9 — Dolphin Sidebar (MVP)	2026‑Q1	Peek metadata inline in KDE Dolphin	• Qt/KIO sidebar	• DP‑010 DB/IP bridge (D‑Bus vs UNIX socket) • CMake packaging script	Sidebar opens ≤ 150 ms; passes KDE lint.
Phase 10 — Full GUI & Multi‑device Sync	2026‑Q2	Visual editor + optional sync backend	• Electron/Qt hybrid explorer UI • Select & integrate sync (LiteFS / Postgres)	• DP‑011 sync back‑end trade‑study • Busy‑timeout/retry strategy for multi‑writer mode	CRUD round‑trip < 2 s between two nodes; 25 GUI e2e tests green.

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2 · Feature cross‑matrix (quick look‑ups)

Capability	Sprint / Phase	CLI / GUI element	Linked DP
Crate split & docs autogen	S0	—	–
Tarpaulin coverage gate	S0	—	–
Watch mode (FS events)	Epic 1	marlin watch .	DP‑002
Backup auto‑prune	Epic 1	backup --prune N	–
Dirty‑scan	Epic 2	scan --dirty	DP‑002
Grep snippets	Phase 3	search -C3 …	DP‑004
Hash / dedupe	Phase 4	scan --rehash	DP‑005
Tag aliases	Phase 5	tag alias commands	DP‑006
Search DSL v2	Phase 6	new grammar, --legacy-search flag	DP‑007
Relationship templates	Phase 7	template new/apply	DP‑008
TUI v1	Phase 8	marlin‑tui	DP‑009

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3 · Milestone acceptance checklist

Before a milestone is declared shipped:

• Spec DP‑xxx merged with schema diff, ASCII‑cast demo
• Tests Tarpaulin ≥ 85 % on changed lines; all suites green
• Perf guard script passes on CI matrix (Ubuntu 22, macOS 14)
• Docs auto‑regenerated; README & cheatsheet updated
• Demo asciinema/GIF committed and linked in release notes
• Release tag pushed; Cargo binary uploaded to GitHub Releases

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4 · Next immediate actions

#	Task	Owner	Due
1	Crate split + CI baseline	@alice	26 May 25
2	Tarpaulin + Hyperfine jobs	@bob	26 May 25
3	DP‑001 Schema v1.1 draft	@carol	30 May 25
4	backup prune CLI + nightly job	@dave	05 Jun 25