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from webkitcorepy import string_utils

from webkitpy.common.checkout.changelog import ChangeLog
from webkitpy.common.config import urls
from webkitpy.tool.steps.abstractstep import AbstractStep


class PrepareChangeLogForRevert(AbstractStep):
    @classmethod
    def _message_for_revert(cls, revision_list, reason, description_list, reverted_bug_url_list, revert_bug_url=None):
        message = "Unreviewed, reverting %s.\n" % string_utils.join(['r' + str(revision) for revision in revision_list])
        if revert_bug_url:
            message += "%s\n" % revert_bug_url
        message += "\n"
        if reason:
            message += "%s\n" % reason
        message += "\n"
        message += "Reverted changeset%s:\n\n" % ('s' if len(revision_list) > 1 else '')
        for index in range(len(revision_list)):
            if description_list[index]:
                message += "\"%s\"\n" % description_list[index]
            if reverted_bug_url_list[index]:
                message += "%s\n" % reverted_bug_url_list[index]
            message += "%s\n\n" % urls.view_revision_url(revision_list[index])
        return message

    def run(self, state):
        reverted_bug_url_list = []
        revert_bug_url = self._tool.bugs.bug_url_for_bug_id(state["bug_id"]) if state["bug_id"] else None
        for bug_id in state["bug_id_list"]:
            reverted_bug_url_list.append(self._tool.bugs.bug_url_for_bug_id(bug_id))
        message = self._message_for_revert(state["revision_list"], state["reason"], state["description_list"], reverted_bug_url_list, revert_bug_url)
        self._tool.executive.run_and_throw_if_fail(['git', 'commit', '-a', '-m', message], cwd=self._tool.scm().checkout_root)