# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project purpose

`sps_skel` takes a mechanical layout (from project planning/sales) together with an
electrical layout (list of sensors, stoppers, switches, etc.) and generates a **skeleton
of Siemens SCL code** ("TRO" — Transfer Route Object — blocks for a conveyor/material-flow
control system) that can be imported directly into TIA Portal.

The repository is currently in the **design/analysis phase**: `lib/`, `tests/`, `examples/`,
and `cfg/` are empty scaffolding directories (see "Standard Programm Template" structure
below). No generator code has been written yet. What exists today is:

- `bin/` — environment/venv management scripts (see "Environment scripts" below)
- `data/*.scl` — real SCL code extracted from an existing plant ("HundM_Fortna", 5
  controllers UH01–UH05), used as reference templates for the planned generator
- `doc/*.md` — analysis documents that reverse-engineer the SCL patterns and propose the
  JSON schema / code-generation approach

Read `doc/` before writing any generator code — it contains the actual domain model this
project is meant to implement.

## Environment scripts (bin/)

Every script has a `.bat` (Windows) and `.sh` (Linux/macOS) pair. **None of them invoke a
concrete Python script** — they only manage the environment and virtualenv.

| Script | Purpose |
|---|---|
| `setenv.bat` / `source setenv.sh` | Sets `SPS_SKEL` (project root) and `SKEL_BIN/LIB/CFG/DATA/LOG/RESULTS/EXAMPLES/TESTS`; prepends `SKEL_LIB` to `PYTHONPATH`; creates missing folders |
| `install_py.bat` / `install_py.sh` | Calls `setenv`, creates `.venv` (`py -m venv` / `python3 -m venv`), installs `requirements.txt`. Aborts with a message if `.venv` already exists |
| `activate_venv.bat` / `activate_venv.sh` | Calls `setenv`, activates `.venv` (errors if missing — run `install_py` first) |
| `get_cmd.bat` / `get_cmd.sh` | Calls `setenv`, opens a new shell with the environment variables set |

Typical workflow on Windows:

```
bin\install_py.bat          # one-time: create venv + pip install
bin\activate_venv.bat       # each session: activate venv + show versions
```

Linux/macOS equivalents must be **sourced**, not executed:

```
bash bin/install_py.sh
source bin/activate_venv.sh
```

Requires Python 3.10+. `requirements.txt` currently has no real dependencies pinned yet
(placeholders for `pydantic`, `pytest`).

There is no build/lint/test command configured yet — `tests/` is empty and no test
runner or linter is set up. Once code exists in `lib/`, use `pytest` (already anticipated
in `requirements.txt`) and set `PYTHONPATH` via `bin/setenv` first so imports resolve
against `lib/`.

## Domain model (from doc/)

The target system is a Siemens TIA Portal / SCL project for automated conveyor/carrier
routing, modeled around **TRO** (Transfer Route Object) blocks. Key documents, read in
this order for onboarding:

1. **`doc/Json_Layout-Konzept.md`** — the core proposal: a JSON file as single source of
   truth (`plc`, `controlUnits`, `sensors[]`, `conveyors[]`, `tros[]`, `loadingBooms[]`,
   `emptyCarrBuffers[]`, `routing`, `jamAreas[]`, `scanners[]`, `connections[]`,
   `destinations[]`) from which the repetitive, per-topology SCL code in `FB_Main`,
   `FB_CallSensors`, `FC_Direction`, `FC_Call_Jams` would be generated.
2. **`doc/TRO_Typen.md`** — catalogs all 10 TRO function-block types actually found across
   the 5 reference controllers (UH01–UH05) and shows that 9 of them are additive
   combinations of one base type (`1Sep` = one separator/stopper) plus reusable
   sub-blocks (`FB_ILS_STRO_Sep`, `FB_ILS_STRO_Switch`, `FB_ILS_STRO_Vario`,
   `FB_BarcodeReaderCognex`, `FB_CarrAccumulate1Sep`). Only `LoadingBoom` is structurally
   independent.
3. **`doc/EA-Listen-Analyse.md`** — analyzes the raw I/O list Excel exports
   (`*_EA.xlsx`/`*_TIA.xlsx`/`*_WSCAD.xlsx`) and companion position/cabling JSON exports,
   and what can vs. cannot be auto-derived from them (signal naming prefixes `BG/SF/DI/BP`
   for inputs, `MB/MA/QA/DQ/FC/PF` for outputs; topology/timing/customCode cannot be
   derived from I/O lists alone — those must come from the JSON model or CAD symbol).
4. **`doc/BricsCAD_TRO_Symbol.md`** — proposes a BricsCAD block symbol whose attributes
   feed the JSON `tros[]` entries; documents which fields are captured on the symbol vs.
   derived from drawing topology or type-based timing defaults.
5. **`doc/SCL_Analyse_Standardisierung.md`** — cross-controller duplication analysis;
   identifies ~22 blocks duplicated identically across all 5 controllers (candidates for
   a shared library) and flags "version chaos" areas (e.g. `FB_StockRemovalBLKModul*`
   variants) that should NOT be naively merged.
6. **`doc/suggestion.md`** — a follow-up proposal to collapse the 7 `FB_ILS_MTRO_*`
   variants into a single `FB_ILS_MTRO` block driven by an array/config descriptor
   instead of hand-duplicated numbered members (`...1`, `...2`, `Dir1..Dir4`). References
   a not-yet-written `lib/create_skel.py` (`guess_fbtype()`) as the intended generator
   entry point — this is the planned shape of the generator, not existing code.

### Used libraries (referenced but not vendored)

Most `FB_ILS_MTRO_*` types exist in this repo **only as `.liblink`** references to an
external `ILSLib` library — the actual FB source is not in this Git repo. `data/*.scl`
contains the real **call-site/instantiation code** (parametrization in `FB_Main`) for
those types, not the FB body. Only a few types have local, fully-vendored SCL source
(`FB_ILS_MTRO_Vario_workStation`, `FB_EmptyCarrBuffer`, `FB_LoadingBoom_INBOUND`,
`FB_ILS_MTRO_2Sep1Swi` — the last one unused/orphaned). Treat `data/*.scl` as **read-only
reference material** for pattern extraction, not code to execute or modify.

## Standard Programm Template

This project follows the user's standard Python project scaffold convention:

```
sps_skel/
  bin/       environment scripts (see above)
  cfg/       config files (INI/JSON) — empty for now
  data/      input data, gitignored except the .scl reference templates
  doc/       documentation
  examples/  example files — empty for now
  lib/       Python source — empty for now, this is where the generator belongs
  log/       gitignored
  results/   gitignored
  tests/     unit tests — empty for now
```

When adding the generator, put it under `lib/` (importable via `SKEL_LIB` on
`PYTHONPATH`), keep `bin/*.bat`/`*.sh` scripts environment-only (do not add
project-specific script invocations to them per the user's convention), and add tests
under `tests/`.