feat(backend): add solver detection and PEP 723 metadata

Author: ParticularlyPythonicBS

.gitignore

@@ -14,6 +14,10 @@
 !uv.lock
 !.python-version
 !run.sh
+!hosting_instructions.md
+!temoa_runner.py
+!frontend/wrangler.toml
+!.github/
 !.pre-commit-config.yaml
 !.coderabbit.yaml
 

backend/main.py

@@ -1,3 +1,14 @@
+# /// script
+# requires-python = ">=3.12"
+# dependencies = [
+#     "temoa>=4.0.0a1",
+#     "fastapi",
+#     "uvicorn[standard]",
+#     "tomlkit",
+#     "websockets",
+# ]
+# ///
+
 import asyncio
 import logging
 import sys
@@ -120,6 +131,42 @@ def list_files(path: str = "."):
         raise HTTPException(status_code=500, detail=str(e))
 
 
+@app.get("/api/solvers")
+def list_solvers():
+    """Detect available solvers on the local system."""
+    try:
+        import pyomo.environ as pyo
+
+        # List of solvers we want to check for
+        common_solvers = [
+            "appsi_highs",
+            "highs",
+            "cbc",
+            "glpk",
+            "ipopt",
+            "gurobi",
+            "cplex",
+        ]
+        available = []
+        for s in common_solvers:
+            try:
+                # Some solvers might throw errors even on check if not installed correctly
+                factory = pyo.SolverFactory(s)
+                if factory.available():
+                    available.append(s)
+            except Exception:
+                continue
+
+        # Ensure we return at least a sensible default if detection fails but temoa is present
+        if not available:
+            return ["appsi_highs", "cbc"]
+
+        return available
+    except ImportError:
+        # Fallback if pyomo is somehow missing
+        return ["appsi_highs", "cbc"]
+
+
 @app.get("/api/results/{run_id}")
 async def get_results(run_id: str):
     run_dir = output_path / run_id

pyproject.toml

@@ -12,3 +12,16 @@ dependencies = [
     "datasette",
     "websockets",
 ]
+
+[tool.pytest.ini_options]
+pythonpath = ["."]
+testpaths = ["backend/tests"]
+filterwarnings = [
+    "ignore:.*deprecated - use.*:pyparsing.PyparsingDeprecationWarning",
+]
+
+[dependency-groups]
+dev = [
+    "httpx>=0.28.1",
+    "pytest>=9.0.2",
+]

run.sh

@@ -4,6 +4,12 @@
 uv sync
 uv add "uvicorn[standard]" websockets
 
+# Cleanup existing processes if running
+echo "Cleaning up stale processes..."
+fuser -k 8000/tcp 2>/dev/null
+fuser -k 8001/tcp 2>/dev/null
+sleep 1
+
 # Start FastAPI backend in background
 echo "Starting backend..."
 uv run python backend/main.py &