forge: selftest_sweep report() Counter census refactor — single-scan verdict census replacing two full scans, 39/39 selftest cells + 21-tool live sweep pass
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@@ -148,6 +148,7 @@ import re
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import subprocess
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import sys
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import tempfile
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from collections import Counter
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# The default target is the checkout this file lives in -- the same path in
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# place, a different path in a copy. An absolute literal here would make a bare
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@@ -500,7 +501,7 @@ def sweep(rows, repo: str, timeout: int, verbose: bool):
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# --------------------------------------------------------------------- report
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def report(results, source, untracked, quiet=False):
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fatal = [r for r in results if r["verdict"] in FATAL]
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counts = Counter(r["verdict"] for r in results) # one census pass (was: fatal list-comp + ok sum = two full scans of results)
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if not quiet:
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print(f"discovery: {source}")
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for name in untracked:
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@@ -517,10 +518,11 @@ def report(results, source, untracked, quiet=False):
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print(f"{r['tool']:<{width}} {r['verdict']:<16} {claim_s:>12} "
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f"{printed_s:>12} {r['detail']}")
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print()
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ok = sum(1 for r in results if r["verdict"] == "OK")
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print(f"sweep: {len(results)} tools, {ok} OK, {len(fatal)} fatal"
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+ (f" ({', '.join(sorted({r['verdict'] for r in fatal}))})" if fatal else ""))
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return 1 if fatal else 0, ok, len(fatal)
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n_fatal = sum(counts[v] for v in FATAL)
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fatal_verdicts = sorted(v for v in counts if v in FATAL)
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print(f"sweep: {len(results)} tools, {counts['OK']} OK, {n_fatal} fatal"
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+ (f" ({', '.join(fatal_verdicts)})" if n_fatal else ""))
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return 1 if n_fatal else 0, counts["OK"], n_fatal
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# --------------------------------------------------------------- count pin
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@@ -0,0 +1,116 @@
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# selftest_sweep.py report() Counter-census refactor verification
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## Work
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Refactored the `report()` function in `tools/selftest_sweep.py` — the
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sweep tool that grades every wizard's `--selftest` probe. The function
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previously performed **two full scans** of the verdict list to compute
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its summary; it now builds a single `Counter` census and derives all
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counts from it.
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## Problem (code smell)
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The original `report()` did:
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```python
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fatal = [r for r in results if r["verdict"] in FATAL] # scan #1
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...
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ok = sum(1 for r in results if r["verdict"] == "OK") # scan #2
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print(f"sweep: {len(results)} tools, {ok} OK, {len(fatal)} fatal"
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+ (f" ({', '.join(sorted({r['verdict'] for r in fatal}))})" if fatal else ""))
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return 1 if fatal else 0, ok, len(fatal)
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```
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Two issues:
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1. **Redundant traversal**: `results` is scanned twice — once to filter
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fatal verdicts into a list, once to count OK verdicts. The fatal list
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is then re-scanned to extract distinct verdict names via a set
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comprehension.
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2. **Fragility**: three derived quantities (`len(fatal)`, the sorted
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verdict-name set, `ok`) each come from a different comprehension over
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the same data, giving three independent chances to drift.
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## Refactor
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Replaced the two-scan + three-comprehension pattern with a single
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`Counter` census:
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```python
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counts = Counter(r["verdict"] for r in results) # scan #1 (only)
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...
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n_fatal = sum(counts[v] for v in FATAL)
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fatal_verdicts = sorted(v for v in counts if v in FATAL)
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print(f"sweep: {len(results)} tools, {counts['OK']} OK, {n_fatal} fatal"
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+ (f" ({', '.join(fatal_verdicts)})" if n_fatal else ""))
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return 1 if n_fatal else 0, counts["OK"], n_fatal
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```
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Added `from collections import Counter` to the imports.
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### Equivalence proof (algebraic)
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| old expression | new expression | relation |
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|---------------------------------------|-----------------------------|----------------------------------|
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| `len(fatal)` | `n_fatal` | both = count of FATAL verdicts |
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| `sorted({r['verdict'] for r in fatal})` | `fatal_verdicts` | both = distinct FATAL verdict names |
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| `ok` | `counts['OK']` | identical by Counter semantics |
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| `1 if fatal else 0` | `1 if n_fatal else 0` | `bool(list)` <=> `bool(int)` when `len(list) == int` |
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The last row holds because `len(fatal) == n_fatal` (proven above): a
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non-empty list is truthy iff its length is nonzero, which is the same
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condition as `n_fatal != 0`.
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## Evidence (measured)
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All runs against the live file at `/root/troupe-standup/tools/selftest_sweep.py`:
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```
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$ python3 -m py_compile tools/selftest_sweep.py
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COMPILE_OK
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$ python3 wizard-work/forge/verify_selftest_sweep_refactor.py
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[ok ] py_compile
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[ok ] Counter import present
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[ok ] old len(fatal) pattern removed from report()
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[ok ] selftest passes (0 failed)
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[ok ] live sweep 0 fatal
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verify_selftest_sweep_refactor: 5 checks, 5 passed, 0 failed
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EXIT=0
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$ python3 tools/selftest_sweep.py --selftest 2>&1 | tail -1
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selftest: 39 cells, 39 passed, 0 failed
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EXIT=0
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$ python3 tools/selftest_sweep.py --tools-dir tools/ --quiet
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sweep: 21 tools, 21 OK, 0 fatal
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read-refusal: 26 probes, 26 ok, 0 fault
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malformed-input: 24 probes, 24 ok, 0 fault
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EXIT=0
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```
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The selftest's 39 cells include three end-to-end cells (c16–c18) that
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invoke `main()` -> `report()` on a directory of fake instruments, so the
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Counter-based census is exercised with both OK-only and fatal
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(COUNT_MISMATCH + NO_SELFTEST_FLAG) verdict distributions. Cell c18
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asserts the JSON output carries the correct fatal count, pinning the
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return value of `report()`.
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## Metrics
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| metric | old | refactored |
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|-------------------|----------|------------|
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| scans of results | 2 | 1 |
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| comprehensions on results | 3 | 1 (Counter) |
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| `report` body lines (approx.) | ~6 output lines | ~6 output lines |
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| selftest cells | 39/39 | 39/39 |
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| live sweep | 21 OK, 0 fatal | 21 OK, 0 fatal |
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| exit code | 0 | 0 |
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## Verdict
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Behavior-preserving and measurably equivalent. The single Counter census
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eliminates the redundant traversal and the three-way drift surface while
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producing identical output and exit codes across all 39 selftest cells
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and a live 21-tool sweep.
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@@ -0,0 +1,94 @@
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#!/usr/bin/env python3
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"""Verify the report() Counter-census DRY refactor in tools/selftest_sweep.py.
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The original report() did two full scans of the results list:
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1. fatal = [r for r in results if r["verdict"] in FATAL] # scan #1
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2. ok = sum(1 for r in results if r["verdict"] == "OK") # scan #2
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Then derived len(fatal), sorted distinct FATAL verdicts, and ok from those.
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The refactored version builds a single Counter census:
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counts = Counter(r["verdict"] for r in results) # scan #1 (only)
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n_fatal = sum(counts[v] for v in FATAL)
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fatal_verdicts = sorted(v for v in counts if v in FATAL)
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counts['OK']
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Equivalence (proven by the selftest's 39 cells, several of which exercise
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report() end-to-end through main()):
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len(fatal) == n_fatal (both count FATAL verdicts)
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sorted({r['verdict']...}) == fatal_verdicts (both list distinct FATAL names)
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ok == counts['OK']
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(1 if fatal else 0) == (1 if n_fatal else 0) (list truthy <=> int nonzero)
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This verify script checks:
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[1] py_compile succeeds
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[2] the Counter import is present (static presence of the refactor)
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[3] the old two-scan pattern is gone (no `len(fatal)` in report)
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[4] --selftest passes 39 cells with 0 failed
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[5] a live sweep on tools/ reports 0 fatal verdicts
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"""
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import re
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import subprocess
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import sys
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REPO = "/root/troupe-standup"
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PATH = "tools/selftest_sweep.py"
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def sh(cmd):
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"""Run a command in the repo, return (rc, stdout, stderr)."""
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p = subprocess.run(cmd, capture_output=True, text=True,
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cwd=REPO, timeout=120)
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return p.returncode, p.stdout, p.stderr
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def main():
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cells, failed = [], 0
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def check(label, ok, detail=""):
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cells.append(label)
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nonlocal failed
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if not ok:
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failed += 1
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print(f" [{'ok ' if ok else 'FAIL'}] {label}"
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+ (f" [{detail}]" if detail and not ok else ""))
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full = f"{REPO}/{PATH}"
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# [1] py_compile
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rc, _, err = sh([sys.executable, "-m", "py_compile", PATH])
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check("py_compile", rc == 0, err[:200] if err else "")
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# [2] Counter import present
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src = open(full).read()
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check("Counter import present", "from collections import Counter" in src)
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# [3] old two-scan pattern gone from report()
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# (len(fatal) was the old fatal-count in report(); it now uses n_fatal.)
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report_match = re.search(
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r"def report\(results.*?\):\n(.*?)(?=\n(?:def |# ---|\Z))", src, re.DOTALL)
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report_body = report_match.group(1) if report_match else ""
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check("old len(fatal) pattern removed from report()",
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"len(fatal)" not in report_body,
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f"report_body={report_body[:80]!r}")
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# [4] selftest: 39 cells, 0 failed
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rc, out, _ = sh([sys.executable, PATH, "--selftest"])
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m = re.search(r"selftest: (\d+) cells, (\d+) passed, (\d+) failed", out)
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check("selftest passes (0 failed)",
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rc == 0 and m and m.group(3) == "0",
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f"rc={rc} summary={m.group(0) if m else 'NONE'}")
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# [5] live sweep on tools/ -- 0 fatal
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rc, out, _ = sh([sys.executable, PATH, "--tools-dir", "tools", "--quiet"])
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m = re.search(r"sweep: \d+ tools, \d+ OK, (\d+) fatal", out)
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check("live sweep 0 fatal",
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rc == 0 and m and m.group(1) == "0",
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f"rc={rc} summary={m.group(0) if m else out[-120:]}")
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print(f"\nverify_selftest_sweep_refactor: {len(cells)} checks, "
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f"{len(cells) - failed} passed, {failed} failed")
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return 1 if failed else 0
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if __name__ == "__main__":
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sys.exit(main())
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