"""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, parse_exit


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

    @property
    def resume(self):
        return False

    COLLECT = [("read", "exit.txt"), ("read", "last.md"), ("read", "stdout.txt"), ("tail", "stderr.txt", 5)]

    def collect(self, handle):
        exit_text, last, stdout, tail = self.fetch(handle, self.COLLECT)   # one remote call
        if last is None:
            last = (stdout or "")[-6000:]
        return ExecResult(last.strip(), parse_exit(exit_text), None,
                          self.logs(handle, "stdout.txt", "stderr.txt"), tail)