INNER CODE UNIT · Python

prepend

theyosh/TerrariumPI · contrib/pipes/__init__.py:135

    def prepend(self, cmd, kind):
        """t.prepend(cmd, kind) adds a new step at the front."""
        if not isinstance(cmd, str):
            raise TypeError("Template.prepend: cmd must be a string")
        if kind not in stepkinds:
            raise ValueError("Template.prepend: bad kind %r" % (kind,))
        if kind == SINK:
            raise ValueError("Template.prepend: SINK can only be appended")
        if self.steps and self.steps[0][1] == SOURCE:
            raise ValueError("Template.prepend: already begins with SOURCE")
        if kind[0] == "f" and not re.search(r"\$IN\b", cmd):
            raise ValueError("Template.prepend: missing $IN in cmd")
        if kind[1] == "f" and not re.search(r"\$OUT\b", cmd):
            raise ValueError("Template.prepend: missing $OUT in cmd")
        self.steps.insert(0, (cmd, kind))

    def open(self, file, rw):
        """t.open(file, rw) returns a pipe or file object open for

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