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Migrate from Bun/TypeScript to Rust

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Chris Wanstrath 2026-04-02 16:47:23 -07:00
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CLAUDE.md
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# shout
Transcript-based shell integration test runner. Bun + TypeScript.
Transcript-based shell integration test runner. Rust.
## Commands
- `bun test` — run unit tests
- `bunx tsc --noEmit` — type check
- `bun run src/cli/index.ts test [files...]` — run shout CLI
- `cargo test` — run tests (integration tests in `tests/shout.rs`)
- `cargo build` — build the binary
- `cargo run -- test [files...]` — run shout CLI
- `-u, --update` — rewrite `.shout` files with actual output
- `-k, --keep` — keep temp directories after run
- `--clean-env` — start with empty environment
@ -19,15 +19,13 @@ Transcript-based shell integration test runner. Bun + TypeScript.
## Architecture
- `src/parse.ts` — parses `.shout` files into `ShoutFile` (list of `Command`)
- `src/run.ts` — executes commands via `Bun.spawn(["/bin/sh"], { detached: true })`, captures output with sentinels
- `src/match.ts` — wildcard-aware output matching and diff generation
- `src/format.ts` — evaluates pass/fail, formats failures and summary
- `src/update.ts` — rewrites `.shout` files with actual output (`--update` mode)
- `src/utils.ts` — shared utilities (`trimTrailingEmpty`, `escapeRegex`)
- `src/duration.ts` — parses duration strings (`10s`, `500ms`, `1m`)
- `src/cli/index.ts` — CLI entry point via `commander`
- `src/index.ts` — barrel exports
- `src/main.rs` — CLI entry point, arg parsing, file discovery, `run_one` orchestration
- `src/parse.rs` — parses `.shout` files into `ShoutFile` (list of `Command`), also `parse_setup`
- `src/run.rs` — executes commands via `/bin/sh`, captures output with sentinels
- `src/matching.rs` — wildcard-aware output matching and diff generation
- `src/format.rs` — evaluates pass/fail, formats failures and summary
- `src/update.rs` — rewrites `.shout` files with actual output (`--update` mode)
- `src/duration.rs` — parses duration strings (`10s`, `500ms`, `1m`)
- `web/index.html` — web documentation page
## .shout file format
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## New feature checklist
1. `src/parse.ts` — update types (`Directive`, `ShoutFile`, `Command`) and both parsers (`parse` + `parseSetup`)
2. `src/parse.test.ts` — unit tests for parsing the new syntax in both `.shout` and setup file contexts
3. `src/cli/index.ts` — wire up the parsed result in `runOne` (directive resolution, command merging, result handling)
4. `tests/*.shout` — integration test file exercising the feature end-to-end
5. `CLAUDE.md` — update `.shout file format` section
6. `README.md` — update Directives section
7. `web/index.html` — add or update a section on the website
8. Run `cargo test` to verify
1. `src/parse.rs` — update types (`Directive`, `ShoutFile`, `Command`) and both parsers (`parse` + `parse_setup`)
2. `src/main.rs` — wire up the parsed result in `run_one` (directive resolution, command merging, result handling)
3. `tests/*.shout` — integration test file exercising the feature end-to-end
4. `CLAUDE.md` — update `.shout file format` section
5. `README.md` — update Directives section
6. `web/index.html` — add or update a section on the website
7. Run `cargo test` to verify
## Style
- Strict TypeScript, Bun runtime
- No classes — plain functions and types
- Rust 2024 edition
- No OOP — plain functions and structs/enums
- Integration tests in `tests/shout.rs`, example `.shout` files in `tests/`