jedarden ef79f73ce3 docs(bf-4aw): verify main.rs execution path implementation

- Prompt resolution: --input-file, positional, stdin (exit 4 on errors)
- Session dispatch: session::run() with claude_args
- Result matching: Interrupted(130), Timeout(3), NoResponse(2), other(2)
- Stream-JSON output: replay transcript line-by-line
- AS-5: binary not found check with human-readable error (exit 2)

All 81 tests pass. No dead_code warnings for output format arms.

2026-06-14 01:01:38 -04:00

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bf-4aw: Wire main.rs - Prompt Resolution, Session Dispatch, Emit

Summary

This bead verified that the main.rs implementation (from commit d942572) correctly wires the full execution path.

What Was Verified

1. Prompt Resolution (lines 57-92)

✓ --input-file <path>: reads file bytes, exits 4 on error
✓ Positional <prompt>: UTF-8 encoded bytes
✓ stdin: reads when !is_terminal(), exits 4 if empty
✓ No prompt: exits 4 with human-readable message

2. Build claude_args (lines 94-110)

✓ model flag: --model <name> when specified
✓ max_turns flag: --max-turns <n> when non-default (30)
✓ no_inherit_hooks: --setting-sources= when specified

3. Session Dispatch (line 115)

✓ Calls session::Session::run() with binary, args, prompt, timeout

4. Result Matching (lines 122-206)

✓ Ok(session_result): emits success, exits 0
✓ Err(Error::Interrupted): emits error, exits 130
✓ Err(Error::Timeout): emits error, exits 3
✓ Err(Error::Internal) with "Child exited without sending Stop payload": emits "claude exited before Stop hook fired", exits 2
✓ Other errors: emit with message, exits 2

5. Stream-JSON Output (lines 127-141, 209-224)

✓ replay_stream_json() reads transcript line-by-line
✓ Emits to stdout for stream-json format
✓ Other formats use emitter::emit_success()

6. AS-5: Binary Not Found Check (lines 48-55)

✓ Checks binary existence with which::which()
✓ Exits 2 with human-readable error: "'<binary>' not found in PATH"

Test Results

$ cargo test --lib
running 81 tests
test result: ok. 81 passed; 0 failed; 0 ignored

No dead_code warnings for output format arms (text/json/stream-json).

AS-5 Verification

$ echo 'hello' | ./target/debug/claude-print --claude-binary /nonexistent
claude-print: '/nonexistent' not found in PATH
Exit code: 2

$ PATH= ./target/debug/claude-print 'hello'
claude-print: 'claude' not found in PATH
Exit code: 2

Both tests pass with human-readable error messages naming the missing binary.

Implementation Notes

The session::Session::run() method internally adds --dangerously-skip-permissions and --settings=<hook_path> to claude_args, so main.rs only needs to pass model/max-turns flags.
Duration tracking happens in main.rs with Instant::now() before calling session::run().
The SessionResult struct includes transcript_path for stream-json replay.
Input errors (file read, stdin read) are handled at prompt resolution time with exit code 4.

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