nil0x42/phpsploit

"""Session History
"""

class History(list):
    """Commands history.

    This class is a specialisation of the list() obj, designed
    to store command line strings only.

    It maintains a `size` property which gives the full size (in bytes)
    of all strings in array.

    To do it, the class operates overriding append(), pop() and clear()
    methods to keep the current size updated in real time.

    """
    MAX_SIZE = 10000
    size = 0

    def append(self, string):
        if not isinstance(string, str):
            raise ValueError("Only strings could be added to history")
        while len(self) >= self.MAX_SIZE:
            self.pop(0)
        self.size += len(string)
        super().append(string)

    def pop(self, index=-1):
        try:
            self.size -= len(self[index])
        except IndexError:
            pass
        super().pop(index)

    def clear(self):
        self.size = 0
        super().clear()