Tools/Scripts/webkitpy/tool/commands/abstractsequencedcommand.py

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from webkitpy.common.system.executive import ScriptError
from webkitpy.common.system.deprecated_logging import log
from webkitpy.tool.commands.stepsequence import StepSequence
from webkitpy.tool.multicommandtool import AbstractDeclarativeCommand


class AbstractSequencedCommand(AbstractDeclarativeCommand):
    steps = None
    def __init__(self):
        self._sequence = StepSequence(self.steps)
        AbstractDeclarativeCommand.__init__(self, self._sequence.options())

    def _prepare_state(self, options, args, tool):
        return None

    def execute(self, options, args, tool):
        try:
            state = self._prepare_state(options, args, tool)
        except ScriptError, e:
            log(e.message_with_output())
            exit(e.exit_code or 2)

        self._sequence.run_and_handle_errors(tool, options, state)