François
cccc5f131d
DESIGN.md: new layered Build section (essim_core + ESSIM_FRONTEND, FTXUI per
frontend, split tests), a rewritten Layout tree (src/core/{domain,imports,app},
src/frontends/tui, tests/{,tui}), and a new "Architecture — core vs frontends"
section stating the rule (core never depends on a frontend) with the export
operation as the worked example. README: layered-build note, FTXUI-is-the-tui-
frontend's dependency, core-vs-frontend test split, nested project-layout tree.
Also keep the binary at ./build/essim via RUNTIME_OUTPUT_DIRECTORY now that the
exe is produced from the frontend subdir.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
124 lines
4.5 KiB
Markdown
124 lines
4.5 KiB
Markdown
# essim — system digital twin
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Interactive simulator for the inter-card connections inside a system. Built
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around a domain model of **modules → parts → pins / signals → connections**,
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with importers for Mentor Graphics, Altium and ODS pinout sheets, a TUI shell
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with scripting, snapshots and BFS net analysis.
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Status: early work-in-progress.
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## Quick start
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```sh
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cmake -S . -B build
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cmake --build build -j
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./build/essim
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```
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The build is **layered**: `essim_core` is the frontend-agnostic business
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library (domain + importers + operations); the `essim` binary comes from a
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**frontend** under `src/frontends/<name>/` that links it. Select one with
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`-DESSIM_FRONTEND=<name>` (default `tui`); `-DESSIM_FRONTEND=none` builds the
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core + tests only, with no GUI toolkit fetched. Architecture in
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[`DESIGN.md`](DESIGN.md).
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Inside the shell, type `help` for the live command list — or read the
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auto-generated reference at [`doc/user/commands.md`](doc/user/commands.md).
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A worked bring-up script is at [`test/system.essim`](test/system.essim);
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load it with `source test/system.essim`.
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To run a script without the TUI and print its output to stdout (CI-friendly):
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```sh
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./build/essim --batch --source bring-up.essim
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```
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Step-by-step walkthroughs for both the batch and TUI workflows are in
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[`doc/user/tutorial.md`](doc/user/tutorial.md).
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## Dependencies
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- **C++17 compiler** and **CMake 3.14+**.
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- System libraries **libzip** and **pugixml** — install the *development*
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packages:
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- Debian/Ubuntu — `sudo apt install libzip-dev libpugixml-dev`
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- Arch — `sudo pacman -S libzip pugixml`
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- Fedora — `sudo dnf install libzip-devel pugixml-devel`
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- **libbsdl** — the standalone BSDL parser, a sibling repo expected at
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`../libbsdl`, pulled in via `add_subdirectory` and linked dynamically.
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Override its location with `-DBSDL_DIR=/path/to/libbsdl`. Powers the
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`attach-bsdl` command and the pin/JTAG checks.
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- Fetched automatically via `FetchContent` (nothing to install): **FTXUI**
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v6.1.9 — only when building the **tui** frontend — and **doctest** v2.4.11
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for the tests.
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- Optional, only for the `doc` target: **doxygen** and **python3**.
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libzip, pugixml and libbsdl are the **core** dependencies; FTXUI belongs to the
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tui frontend, so a `-DESSIM_FRONTEND=none` build needs none of it.
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## Tests
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```sh
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./build/essim_tests
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# or
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ctest --test-dir build
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```
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`ctest` runs `essim_tests` (core — links `essim_core`, no GUI toolkit) and
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`essim_tui_tests` (the FTXUI frontend's tests, under `tests/tui/`).
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Skip building tests entirely:
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```sh
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cmake -S . -B build -DBUILD_TESTING=OFF
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```
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## Documentation
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- [`doc/user/`](doc/user/) — user guide, command reference, scripting.
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- [`doc/api/`](doc/api/) — auto-generated C++ API reference.
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- [`DESIGN.md`](DESIGN.md) — implementation notes (domain conventions, TUI
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internals, gotchas).
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- [`doc/README.md`](doc/README.md) — how the doc pipeline is wired.
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Regenerate auto-generated parts after substantive code changes:
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```sh
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cmake --build build --target doc # needs doxygen + python3
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```
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## Project layout
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```
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src/
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core/ business logic, NO GUI toolkit (→ libessim_core)
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domain/ model (Module/Part/Pin/Signal, Connection, Transform…) + analyses
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imports/ Mentor / Altium / ODS netlist importers + ODS writer
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app/ use-case operations (export → CSV/ODS, …)
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frontends/ one dir per GUI/TUI engine, each links essim_core
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tui/ FTXUI shell + main.cpp (→ libessim_tui + the `essim` binary)
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tests/ core tests (link essim_core)
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tui/ frontend tests (link essim_tui)
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doc/ api/ + user/ Markdown, Doxyfile.in, gen_api_md.py
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test/ sample netlists + system.essim bring-up script
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```
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Full layout & rationale in [`DESIGN.md`](DESIGN.md).
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## Licence
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Copyright (c) 2026 François Dausseur
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Licensed under the **European Union Public Licence (EUPL), Version 1.2** —
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the "Licence". You may not use this work except in compliance with the
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Licence. You may obtain a copy of the Licence in the [`LICENSE`](LICENSE)
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file or at <https://joinup.ec.europa.eu/software/page/eupl>.
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Unless required by applicable law or agreed to in writing, software
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distributed under the Licence is distributed on an "AS IS" basis,
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**WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND**, either express or
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implied. See the Licence for the specific language governing permissions
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and limitations under the Licence.
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SPDX-License-Identifier: EUPL-1.2
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