feat(graph): add Julia language support (breadth tier)

[itchyshin]

feat(graph): add Julia language support (breadth tier)

Adds Julia to the breadth (generic tree-sitter) tier, following the Lua addition in #187: one registry row in src/graph/generic.ts plus src/graph/queries/julia.scm.

The bundled tree-sitter-wasm already ships tree-sitter-julia.wasm, but that grammar has no upstream tags.scm (only folds/highlights/indents/injections/locals), so the query is hand-written against its node vocabulary. call_expression / signature carry no named fields in this grammar, so patterns anchor on child position.

Captured

• @definition.function: long form function f(x) … end, short form f(x) = …, qualified methods Base.show(io, x) = … / function Base.size(b) … end (last path segment is the name), where clauses in both forms, macro-annotated one-liners (@inline g(x) = x), bodiless function f end, and macro m(ex) … end.
• @definition.struct / .type: struct, mutable struct, parametrised S{T}, <: Super, abstract type, primitive type.
• @definition.module, @definition.constant (const K = 3).
• @reference.call: plain, qualified (Mod.f(x)) and broadcast (f.(x)) calls. A call on the left of = is a definition, on the right a reference; the extractor's existing definition-name guard prevents self-loops.
• @reference.class: the supertype in <: Super, so an abstract type that is only ever subtyped is not an orphan.

Tests

• test/generic-extract.test.ts: .jl routes to julia; a snippet covering the constructs above yields the expected definitions and a resolved fit → helper call edge.
• npx tsx --test test/generic-extract.test.ts test/supported-extensions.test.ts test/graph-languages.test.ts: 29/29 pass. Full npm test: 1216/1222 pass; the 5 failures (claude-shim-resolve ×4, graph-refresh lock-release ×1) fail identically on main in this environment.
• Real repo: a 890-file Julia/R/Python package builds to 6,496 nodes / 9,487 edges in ~14 s; ask, callers and skeleton return correct file:line spans.

README language list and count updated (24).

🤖 Generated with Claude Code

[trailhq-graft]

🌱 graft blast radius

1 area changed → 6 areas can be affected. 15 dependent symbols, depth 2.
Tag: @anirudhkumar-nanonets — 5 of 7 areas · @shhdwi — 5 of 7 areas · @Frankie-Xu — Context Building

flowchart TB
  A0(("Dependency Graph<br/>8 symbols"))
  A1(("Build Analysis<br/>2 symbols"))
  A2(("CLI Engine<br/>2 symbols"))
  A3(("Context Building<br/>1 symbol"))
  A4(("LSP Enrichment<br/>1 symbol"))
  AX(("1 smaller area<br/>1 symbol"))
  classDef reached fill:#D9EDF3,stroke:#3AA7C9,stroke-width:1.5px,color:#0E313C;
  class A0,A1,A2,A3,A4 reached;
  classDef tail fill:#EEF2F3,stroke:#9AA4A9,stroke-width:1px,color:#3A4247;
  class AX tail;

Loading

Can be affected	Symbols	Nearest hop	Reached from
Dependency Graph	8	src/graph/build.ts:L1-L411 build.ts — imports, depth 1	Generic Graph
Build Analysis	2	src/app/brain-build.ts:L1-L428 brain-build.ts — imports, depth 2	Generic Graph
CLI Engine	2	src/cli.ts:L1-L1407 cli.ts — imports, depth 2	Generic Graph
Context Building	1	src/context/build.ts:L1-L468 build.ts — imports, depth 2	Generic Graph
LSP Enrichment	1	src/graph/lsp/enrich.ts:L1-L141 enrich.ts — imports, depth 1	Generic Graph
MCP Tools	1	src/mcp/tools.ts:L1-L330 tools.ts — imports, depth 2	Generic Graph

Who knows this code — 3 people across 7 areas

Area	Who knows it
Generic Graph · changed	@shhdwi — 7 commits, last 1mo ago
Dependency Graph · affected	@anirudhkumar-nanonets — 24 commits, last 17d ago · @shhdwi — 21 commits, last 1mo ago
Build Analysis · affected	@anirudhkumar-nanonets — 9 commits, last 3d ago
CLI Engine · affected	@anirudhkumar-nanonets — 41 commits, last 3d ago · @shhdwi — 24 commits, last 1mo ago
Context Building · affected	@anirudhkumar-nanonets — 4 commits, last 24d ago · @Frankie-Xu — 2 commits, last 13d ago
LSP Enrichment · affected	@shhdwi — 2 commits, last 1mo ago
MCP Tools · affected	@shhdwi — 14 commits, last 1mo ago · @anirudhkumar-nanonets — 7 commits, last 11d ago

Ownership is git history over each area's own files, weighted towards recent work (120-day half-life). Merge commits and bots are dropped, and you are dropped from your own PR. A name with no @ has no GitHub handle in its commit email — tag them by hand, or add a .mailmap entry. A suggestion from history, not a CODEOWNERS rule.

All 15 dependent symbols, grouped by area

Dependency Graph — 8 symbols in 8 files

• src/graph/build.ts:L1-L411 — build.ts (imports, depth 1)
  21: import { extractGeneric, genericLangOf, warmGenericGrammars } from "./generic.js";
• src/graph/check.ts:L1-L221 — check.ts (imports, depth 1)
  24: import { extractGeneric, genericLangOf, warmGenericGrammars } from "./generic.js";
• src/graph/container.ts:L1-L209 — container.ts (imports, depth 1)
  25: import { loadWasmLanguage, parseWasm, type TsNode } from "./generic.js";
• src/graph/resolve.ts:L1-L658 — resolve.ts (imports, depth 1)
  19: import { genericLangOf } from "./generic.js";
• src/graph/source-files.ts:L1-L121 — source-files.ts (imports, depth 1)
  15: import { genericLangOf, genericExtensions } from "./generic.js";
• src/graph/fingerprint.ts:L1-L197 — fingerprint.ts (imports, depth 2)
• src/graph/refresh.ts:L1-L274 — refresh.ts (imports, depth 2)
• src/graph/workspace.ts:L1-L725 — workspace.ts (imports, depth 2)

Build Analysis — 2 symbols in 2 files

• src/app/brain-build.ts:L1-L428 — brain-build.ts (imports, depth 2)
• src/app/review.ts:L1-L174 — review.ts (imports, depth 2)

CLI Engine — 2 symbols in 2 files

• src/cli.ts:L1-L1407 — cli.ts (imports, depth 2)
• src/engine.ts:L1-L161 — engine.ts (imports, depth 2)

Context Building — 1 symbol in 1 file

• src/context/build.ts:L1-L468 — build.ts (imports, depth 2)

LSP Enrichment — 1 symbol in 1 file

• src/graph/lsp/enrich.ts:L1-L141 — enrich.ts (imports, depth 1)
  17: import { genericLangOf } from "../generic.js";

MCP Tools — 1 symbol in 1 file

• src/mcp/tools.ts:L1-L330 — tools.ts (imports, depth 2)

Test signal per changed area — 1 –

Reached = a node under a test path has a resolved edge into the changed symbol. It undercounts anything called indirectly — through a CLI, a spawned process or a dynamic import — so read a low ratio as “look here”, never as a coverage gate.

• – Generic Graph — 1 test file changed here: test/generic-extract.test.ts

38 test suites also reference this code

38 symbols, kept out of the diagram and the table so they cannot crowd out the areas a reviewer has to look at.

• test/ask-index.test.ts
• test/ask.test.ts
• test/container-extract.test.ts
• test/context-only-dir.test.ts
• test/context.test.ts
• test/covers.test.ts
• test/generic-node24-probe.ts
• test/graph-cross-language.test.ts
• test/graph-enrich-pending.test.ts
• test/graph-go.test.ts
• test/graph-incremental.test.ts
• test/graph-invariants.test.ts
• test/graph-java.test.ts
• test/graph-languages.test.ts
• test/graph-php.test.ts
• test/graph-posix-paths.test.ts
• test/graph-python.test.ts
• test/graph-r-classes.test.ts
• test/graph-r-phase3.test.ts
• test/graph-r-phase4.test.ts
• …18 more

⚠️ 2 changed files not in the graph (README.md, src/graph/queries/julia.scm) — no parser claims the extension, or the index predates the file.

_{graft blast · origin/main...HEAD · depth 2 · 4 changed files}

Open the interactive graph → — click an area to see its dependent symbols at file:line.