"""Shell/script executor: runs `{script}` with the prompt on stdin. The last message is `last.md` in the run
directory if the script wrote it (its path is passed as {out}), else the tail of stdout. No threads."""
from .base import ExecResult, RunnerExecutor


class ShellExecutor(RunnerExecutor):
    stdout_name = "stdout.txt"

    @property
    def resume(self):
        return False

    def collect(self, handle):
        t, d = self.transport, handle["run_dir"]
        last = t.read_text(t.join(d, "last.md"))
        if last is None:
            last = (t.read_text(t.join(d, "stdout.txt")) or "")[-6000:]
        return ExecResult(last.strip(), self.exit_code(handle), None,
                          self.logs(handle, "stdout.txt", "stderr.txt"), self.stderr_tail(handle))