Add GitHub Actions CI (OpenModelica tests, mofmt formatting) and fix failing examples

.github/workflows/mofmt.yml

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+# Format the Modelica code with mofmt (https://github.com/ErykMroczek/mofmt).
+#
+#   - Pull request from a branch of this repository, or manual run: mofmt is
+#     applied and a "style: format Modelica code with mofmt" commit is pushed
+#     to the branch (run "git pull" afterwards).
+#   - Pull request from a fork, or direct push to master: nothing is pushed,
+#     the job fails if some files are not formatted.
+#
+# Commits pushed with GITHUB_TOKEN do not trigger other workflows, so the
+# OpenModelica tests are not re-run on the formatting commit.
+
+name: mofmt
+
+on:
+  pull_request:
+    branches: [master]
+    paths: ['**.mo', '.github/workflows/mofmt.yml']
+  push:
+    branches: [master]
+    paths: ['**.mo', '.github/workflows/mofmt.yml']
+  workflow_dispatch:
+
+permissions:
+  contents: write   # needed to push the formatting commit
+
+concurrency:
+  group: mofmt-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  MOFMT_VERSION: 0.6.0
+
+jobs:
+  mofmt:
+    runs-on: ubuntu-latest
+    steps:
+      # On pull requests, check out the branch itself (not the merge commit)
+      # so the formatting commit can be pushed to it.
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          repository: ${{ github.event.pull_request.head.repo.full_name || github.repository }}
+          ref: ${{ github.event.pull_request.head.ref || github.ref }}
+
+      - name: Cache mofmt
+        id: cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/bin/mofmt
+          key: mofmt-${{ env.MOFMT_VERSION }}-${{ runner.os }}
+
+      - name: Install mofmt
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: cargo install mofmt --version "$MOFMT_VERSION" --locked
+
+      # mofmt panics on files starting with a UTF-8 BOM, which some Windows
+      # editors add. Does nothing on files without BOM.
+      - name: Strip UTF-8 BOM
+        run: find . -name '*.mo' -not -path './.git/*' -exec sed -i '1s/^\xEF\xBB\xBF//' {} +
+
+      - name: Format
+        run: mofmt .
+
+      - name: Commit formatting
+        if: github.event_name == 'workflow_dispatch' || (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository)
+        run: |
+          if git diff --quiet; then echo "Already formatted"; exit 0; fi
+          git diff --stat
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git commit -am "style: format Modelica code with mofmt"
+          git push
+
+      # Pull requests from forks have no write access, and master should only
+      # receive formatted code through pull requests: report only.
+      - name: Report unformatted files
+        if: github.event_name == 'push' || (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository)
+        run: |
+          if git diff --quiet; then echo "Already formatted"; exit 0; fi
+          git diff --stat
+          echo "::error::Some .mo files are not formatted with mofmt $MOFMT_VERSION. Run 'mofmt .' at the repository root."
+          exit 1

.github/workflows/openmodelica-tests.yml

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+# Test TAeZoSysPro Examples and Tests models with OpenModelica, using
+# ModelicaTests (https://gitlab.pam-retd.fr/thermosysproandco/modelicatests),
+# and compare them with the master branch of EDF-Lab/TAeZoSysPro:
+#   - .test/config_new_openmodelica.json tests the checked out version,
+#   - .test/config_ref_openmodelica.json tests master, cloned by ModelicaTests.
+# If the reference cannot be tested (for instance while master still has the
+# library at the repository root instead of src/TAeZoSysPro), the checked out
+# version is tested alone. The run summary, written by .test/report.py, shows
+# the results table of the ModelicaTests HTML report for the tested version,
+# and the comparison with the reference (fixed, regression, results changed).
+#
+# Required repository settings (Settings > Secrets and variables > Actions):
+#   - secret MODELICATESTS_TOKEN: GitLab token with read_repository access to
+#     the ModelicaTests project.
+#   - variable OPENMODELICA_IMAGE (optional): OpenModelica Docker image.
+#
+# Failing models do not fail the workflow: they are reported in the run
+# summary, and in the uploaded HTML/CSV reports and OpenModelica logs. The
+# workflow only fails on infrastructure errors (library or MSL not loadable,
+# ModelicaTests crash).
+
+name: OpenModelica tests
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test-openmodelica:
+    # Pull requests from forks have no access to secrets, so the private
+    # ModelicaTests repository cannot be cloned: skip the job instead of failing.
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository
+    runs-on: ubuntu-latest
+    container:
+      image: ${{ vars.OPENMODELICA_IMAGE || 'openmodelica/openmodelica:v1.26.7-ompython' }}
+    steps:
+      # git is needed to clone ModelicaTests; python3-venv is used to avoid
+      # installing Python packages as root.
+      - name: Install system dependencies
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends git ca-certificates python3-venv
+
+      # The library is in src/TAeZoSysPro: OpenModelica requires the directory
+      # containing package.mo to be named after the package.
+      - name: Checkout TAeZoSysPro
+        uses: actions/checkout@v4
+        with:
+          path: TAeZoSysPro
+
+      - name: Clone ModelicaTests
+        env:
+          MODELICATESTS_TOKEN: ${{ secrets.MODELICATESTS_TOKEN }}
+        run: git clone --depth 1 "https://oauth2:${MODELICATESTS_TOKEN}@gitlab.pam-retd.fr/thermosysproandco/modelicatests.git" modelicatests
+
+      # Copy TAeZoSysPro test configuration files into the ModelicaTests test
+      # directory, where the runner expects them.
+      - name: Configure ModelicaTests
+        run: |
+          cp TAeZoSysPro/.test/*.json modelicatests/tests/
+          cat > modelicatests/tests/local_config.json <<'JSON'
+          {
+            "dymola": {
+              "egg": "",
+              "exe": ""
+            },
+            "openmodelica": {
+              "exe": "/usr/bin/omc"
+            }
+          }
+          JSON
+
+      # Docker jobs run as root. OpenModelica refuses to start its ZMQ server
+      # as root, and omc4py needs that server, so the tests run as ciuser.
+      # If the run with the reference fails, its outputs are removed and the
+      # checked out version is tested alone (report.py then skips the comparison).
+      - name: Run ModelicaTests
+        run: |
+          useradd --create-home --shell /bin/bash ciuser
+          chown -R ciuser:ciuser "$GITHUB_WORKSPACE"
+          su ciuser -c "cd '$GITHUB_WORKSPACE/modelicatests' && python3 -m venv .venv && . .venv/bin/activate && python -m pip install --upgrade pip && python -m pip install ."
+          cd modelicatests/tests
+          su ciuser -c ". ../.venv/bin/activate && python3 run_cli.py config_ref_openmodelica.json config_new_openmodelica.json --ncpus 4 --timeout 120" || {
+            echo "::warning::ModelicaTests failed with the reference (master), see the log above: testing the checked out version alone."
+            rm -rf config_ref_openmodelica.csv config_ref_openmodelica.html config_ref_openmodelica-* TMP_*
+            su ciuser -c ". ../.venv/bin/activate && python3 run_cli.py config_new_openmodelica.json --ncpus 4 --timeout 120"
+          }
+
+      # Written to a file first: ciuser cannot write to $GITHUB_STEP_SUMMARY.
+      - name: Write results summary
+        if: always()
+        run: |
+          su ciuser -c "cd '$GITHUB_WORKSPACE/modelicatests/tests' && . ../.venv/bin/activate && python3 '$GITHUB_WORKSPACE/TAeZoSysPro/.test/report.py' config_ref_openmodelica.csv config_new_openmodelica.csv > report.md"
+          cat modelicatests/tests/report.md >> "$GITHUB_STEP_SUMMARY"
+
+      - name: Upload reports
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: modelicatests-report
+          retention-days: 7
+          # TMP_*/<model>/ holds the OpenModelica check, build and simulation
+          # logs of each model, needed to understand a failure.
+          path: |
+            modelicatests/tests/*.csv
+            modelicatests/tests/*.html
+            modelicatests/tests/*-junit.xml
+            modelicatests/tests/report.md
+            modelicatests/tests/TMP_*/*/*.log
+            modelicatests/tests/TMP_*/*/*.txt
+          if-no-files-found: warn

.test/config_new_openmodelica.json

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+{
+    "software": "OpenModelica",
+    "dymola": {
+        "advanced_flags":["Advanced.LogNonLinearIterationVariables=true","Advanced.GenerateBlockTimers=true"]
+    },
+    "openmodelica": {
+        "modelica_version": "3.2.3",
+        "compiler_flags":{
+            "--matchingAlgorithm":"PFPlusExt",
+            "-d":"initialization,iterationVars,stateselection,backenddaeinfo,stateselection,aliasConflicts,bltdump"
+        },
+        "simflags":{
+            "-jacobian":"coloredNumerical"
+        }
+    },
+    "libs": {
+        "TAeZoSysPro": {
+            "path": "../../TAeZoSysPro/src/TAeZoSysPro/package.mo",
+            "models_filter": "\\.(Examples|Tests)\\.",
+            "vars_filter": ".*"
+        }
+    }
+}

.test/config_ref_openmodelica.json

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+{
+    "software": "OpenModelica",
+    "dymola": {
+        "advanced_flags":["Advanced.LogNonLinearIterationVariables=true","Advanced.GenerateBlockTimers=true"]
+    },
+    "openmodelica": {
+        "modelica_version": "3.2.3",
+        "compiler_flags":{
+            "--matchingAlgorithm":"PFPlusExt",
+            "-d":"initialization,iterationVars,stateselection,backenddaeinfo,stateselection,aliasConflicts,bltdump"
+        },
+        "simflags":{
+            "-jacobian":"coloredNumerical"
+        }
+    },
+    "libs": {
+        "TAeZoSysPro": {
+            "path": {
+                "url": "https://github.com/EDF-Lab/TAeZoSysPro.git",
+                "target": "master",
+                "package_path": "src/TAeZoSysPro/package.mo"
+            },
+            "models_filter": "\\.(Examples|Tests)\\.",
+            "vars_filter": ".*"
+        }
+    }
+}