Sone431engsub Convert021018 Min Upd -

| Symptom | Likely Cause | Fix | |---------|--------------|-----| | ImportError: cannot import name 'convert021018' | Library version mismatch or wrong import path. | pip list | grep sone431engsub → check the version. Consult the library’s README for the correct module name (e.g., from sone431engsub.core import convert021018). | | UnicodeDecodeError while reading source | Legacy files contain non‑UTF‑8 bytes. | Open with the correct encoding, e.g., open(src, encoding='latin1'). | | No output files generated | diff_min_update returned an empty dict for every file. | Verify that the source actually needs conversion (maybe the raw data already matches the target schema). You can temporarily comment out the diff step to force a full write. | | Converted JSON is huge | Minimal diff logic not applied (e.g., you accidentally called json.dump(converted_full, …)). | Ensure you are using minimal = diff_min_update(existing, converted_full) and merging only that. | | Performance slowdown on >10k files | Re‑reading the same target file each iteration. | Cache the existing JSON in memory if the target set is static, or use a simple if dst.stat().st_mtime > src.stat().st_mtime: skip. |

Below is a complete, ready‑to‑run Python driver (scripts/convert_minupd.py). Adjust the paths/flags to match your environment.

#!/usr/bin/env python3
"""
convert_minupd.py
-----------------
Runs sone431engsub.convert021018 on every file in `data/raw/`,
writes only the changed fields to `data/converted/`.
"""
import os
import sys
import json
import hashlib
from pathlib import Path
# ----------------------------------------------------------------------
# 1️⃣  Import the library (adjust import name if it uses a different layout)
# ----------------------------------------------------------------------
try:
    from sone431engsub import convert021018, diff_min_update
except ImportError as e:
    sys.stderr.write(
        "ERROR: Could not import sone431engsub. "
        "Make sure the package is installed and the venv is active.\n"
    )
    raise e
# ----------------------------------------------------------------------
# 2️⃣  Helper: compute a short hash of a file (useful for idempotency checks)
# ----------------------------------------------------------------------
def file_hash(path: Path, blocksize: int = 65536) -> str:
    h = hashlib.sha256()
    with path.open("rb") as f:
        for block in iter(lambda: f.read(blocksize), b""):
            h.update(block)
    return h.hexdigest()[:12]
# ----------------------------------------------------------------------
# 3️⃣  Core conversion routine
# ----------------------------------------------------------------------
def process_one(src: Path, dst: Path) -> None:
    """
    Convert a single file with minimal updates.
    - src : Path to the legacy file.
    - dst : Path where the converted file will be written.
    """
    # Load raw content (the library usually accepts a string or a dict)
    with src.open("r", encoding="utf-8") as f:
        raw_content = f.read()
# 1️⃣ Run the full conversion
    converted_full = convert021018(raw_content)          # ← returns a dict / JSON string
# 2️⃣ Load the existing target (if any) to compare
    if dst.exists():
        with dst.open("r", encoding="utf-8") as f:
            existing = json.load(f)
    else:
        existing = {}
# 3️⃣ Compute *minimal* diff (the library provides a helper; otherwise roll your own)
    minimal = diff_min_update(existing, converted_full)  # returns only changed keys
# 4️⃣ If nothing changed, skip writing
    if not minimal:
        print(f"[SKIP] src.name – no differences")
        return
# 5️⃣ Merge minimal diff into existing structure and write back
    merged = **existing, **minimal
    dst.parent.mkdir(parents=True, exist_ok=True)
    with dst.open("w", encoding="utf-8") as f:
        json.dump(merged, f, indent=2, ensure_ascii=False)
print(f"[OK]   src.name → dst.name (changed: len(minimal) fields)")
# ----------------------------------------------------------------------
# 4️⃣  Main driver – walk the raw folder
# ----------------------------------------------------------------------
def main():
    raw_dir = Path(__file__).resolve().parents[1] / "data" / "raw"
    out_dir = Path(__file__).resolve().parents[1] / "data" / "converted"
if not raw_dir.is_dir():
        sys.exit(f"❌ Raw directory not found: raw_dir")
# Iterate over every *.s1e (or any extension you need)
    for src_file in raw_dir.glob("*.s1e"):
        dst_file = out_dir / src_file.name.replace(".s1e", ".json")
        try:
            process_one(src_file, dst_file)
        except Exception as exc:
            sys.stderr.write(f"⚠️  Failed on src_file.name: exc\n")
if __name__ == "__main__":
    main()

| Item | Meaning | |------|----------| | sone431engsub | A proprietary (or in‑house) Python/Node/Java library that supplies engineering‑specific sub‑routines (e.g., unit conversion, geometry sanitisation). | | convert021018 | The named conversion routine released on 02‑Oct‑2018 (or version 021018). It handles bulk translation of legacy “S‑ONE 4.3.1” engineering files into the newer ENGSUB schema. | | min upd | “Minimal update” – a mode that only writes back fields that have actually changed, leaving the rest of the original file untouched. This keeps file size down and preserves any hidden metadata. | sone431engsub convert021018 min upd

The typical workflow is:

If you want the conversion to run automatically on every push: | Symptom | Likely Cause | Fix |

# .github/workflows/convert.yml
name: Convert legacy files (minimal update)
on:
  push:
    paths:
      - 'data/raw/**'
jobs:
  convert:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'
      - name: Install deps
        run: |
          python -m venv venv
          source venv/bin/activate
          pip install -r requirements.txt
      - name: Run conversion
        run: |
          source venv/bin/activate
          python scripts/convert_minupd.py
      - name: Commit changes
        uses: stefanzweifel/git-auto-commit-action@v5
        with:
          commit_message: "chore: minimal‑update conversion (auto)"
          file_pattern: data/converted/*

Result: Every time a new legacy file lands in data/raw/, the workflow converts it, commits only the delta, and keeps the repository tidy.

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