giles
0f67021aa3
Five new guest-language plans mirroring the js-on-sx / hs-loop pattern, each with a phased roadmap (Progress log + Blockers), a self-contained agent briefing for respawning a long-lived loop, and a shared restore-all.sh that snapshots state across all seven language loops. Briefings bake in the lessons from today's stall debugging: never call sx_build (600s watchdog), only touch lib/<lang>/** + own plan file, commit every feature, update Progress log on each commit, route shared-file issues to Blockers rather than fixing them. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
76 lines
4.0 KiB
Markdown
76 lines
4.0 KiB
Markdown
# erlang-on-sx loop agent (single agent, queue-driven)
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Role: iterates `plans/erlang-on-sx.md` forever. Actors + mailboxes + selective receive on delimited continuations. The million-process ring benchmark is the headline showcase.
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```
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description: erlang-on-sx queue loop
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subagent_type: general-purpose
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run_in_background: true
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isolation: worktree
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```
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## Prompt
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You are the sole background agent working `/root/rose-ash/plans/erlang-on-sx.md`. Isolated worktree, forever, one commit per feature. Never push.
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## Restart baseline — check before iterating
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1. Read `plans/erlang-on-sx.md` — roadmap + Progress log.
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2. `ls lib/erlang/` — pick up from the most advanced file.
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3. If `lib/erlang/tests/*.sx` exist, run them. Green before new work.
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4. If `lib/erlang/scoreboard.md` exists, that's your baseline.
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## The queue
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Phase order per `plans/erlang-on-sx.md`:
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- **Phase 1** — tokenizer + parser (atoms, vars, tuples, lists, binaries, clauses with patterns + guards)
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- **Phase 2** — sequential eval + pattern matching + guards + core BIFs (`length`, `hd`, `tl`, `element`, `lists:map`, `io:format`)
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- **Phase 3** — **THE SHOWCASE**: scheduler + processes + mailboxes + `spawn`/`!`/`receive` via delimited continuations. 5 classic programs (ring, ping_pong, bank, echo, fib_server) green. Million-process ring benchmark works.
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- **Phase 4** — links, monitors, exit signals, `try/catch`
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- **Phase 5** — modules + `M:F(...)` cross-module calls + `gen_server` + `supervisor` + registered processes
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- **Phase 6** — list comprehensions + binary pattern matching + ETS-lite + drive corpus to 200+
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Within a phase, pick the checkbox that unlocks the most tests per effort.
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Every iteration: implement → test → commit → tick `[ ]` → Progress log → next.
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## Ground rules (hard)
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- **Scope:** only `lib/erlang/**` and `plans/erlang-on-sx.md`. Do **not** edit `spec/`, `hosts/`, `shared/`, other `lib/<lang>/` dirs, `lib/stdlib.sx`, or `lib/` root. Erlang primitives go in `lib/erlang/runtime.sx`.
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- **NEVER call `sx_build`.** 600s watchdog. If sx_server binary broken → Blockers entry, stop.
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- **Shared-file issues** → plan's Blockers with minimal repro.
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- **Delimited continuations** are in `lib/callcc.sx` + `spec/evaluator.sx` Step 5. `sx_summarise` spec/evaluator.sx first — 2300+ lines.
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- **SX files:** `sx-tree` MCP tools ONLY. `sx_validate` after edits.
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- **Worktree:** commit locally. Never push. Never touch `main`.
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- **Commit granularity:** one feature per commit.
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- **Plan file:** update Progress log + tick boxes every commit.
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## Erlang-specific gotchas
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- **Process** = record with `{pid, mailbox, state, continuation, links, monitors, trap_exit?}`. Scheduler queue is a list of runnable pids.
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- **`receive`** is selective — scan mailbox in order, try each pattern, bind on match, **keep unmatched messages in mailbox**. If no match, `perform` a suspend with the receive pattern; scheduler resumes the continuation when a matching message arrives.
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- **`after N -> ...`** timeout uses SX timer primitive; if no match within N ms, run the after-branch.
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- **Pattern matching on tuples/lists** is SX `case` on tagged values — bound variables must re-unify, not rebind.
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- **Guards are pure** — compile-time check that no side-effecting calls appear.
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- **Immutable data** — no in-place mutation; sends copy.
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- Atoms are interned strings.
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- Don't go near the preprocessor (`-define`, `-ifdef`). Out of scope.
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- Test corpus is custom (not BEAM conformance). Write your own plus classic programs in `lib/erlang/tests/programs/`.
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## General gotchas (all loops)
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- SX `do` = R7RS iteration. Use `begin` for multi-expr sequences.
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- `cond`/`when`/`let` clauses evaluate only the last expr.
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- `type-of` on user fn returns `"lambda"`.
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- Shell heredoc `||` gets eaten — escape or use `case`.
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## Style
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- No comments in `.sx` unless non-obvious.
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- No new planning docs — update `plans/erlang-on-sx.md` inline.
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- Short, factual commit messages (`erlang: spawn/1 + basic scheduler (+5)`).
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- One feature per iteration. Commit. Log. Next.
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Go. Read the plan; find first `[ ]`; implement.
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