Initial Seg Data Server Net platform

backend/app/commands.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from pathlib import Path
+
+
+@dataclass
+class CommandSpec:
+    command: list[str]
+    cwd: Path
+    description: str = ""
+    env: dict[str, str] = field(default_factory=dict)
+    stdin_text: str | None = None
+
+
+TaskFactory = callable
+
+
+def conda_python(env_name: str, script: Path, *args: object) -> list[str]:
+    return ["conda", "run", "-n", env_name, "python", str(script), *[str(a) for a in args]]
+
+
+def python(script: Path, *args: object) -> list[str]:
+    return ["python", str(script), *[str(a) for a in args]]
+
+
+def bash(script: Path, *args: object) -> list[str]:
+    return ["bash", str(script), *[str(a) for a in args]]
+
+
+def option(params: dict, name: str, default=None):
+    value = params.get(name, default)
+    return value
+
+
+def required(params: dict, name: str):
+    if name not in params or params[name] in (None, ""):
+        raise ValueError(f"missing required parameter: {name}")
+    return params[name]
+
+
+def append_flag(args: list[str], flag: str, value):
+    if value not in (None, ""):
+        args.extend([flag, str(value)])
+