try:
    import mercurial
    from mercurial import hg
    from mercurial import ui
    from mercurial import commands as hgc
    has_hg = True
except ImportError:
    has_hg = False

import buffer, default, dirutil, lex, regex, util, window
from point import Point

from method import Method, Argument

class HgDiff(Method):
    """

    """
    def _execute(self, w, **vargs):
        if not has_hg:
            w.set_error("Mecurial is not installed")
            return
        elif not hasattr(w.buffer, 'path'):
            w.set_error("Buffer has no corresponding file")
            return
        ui_imp = ui.ui(verbose=True)
        repo = hg.repository(ui=ui_imp, path='.')
        ui_imp.pushbuffer()
        hgc.diff(ui_imp, repo, w.buffer.path)
        data = ui_imp.popbuffer()
        w.application.data_buffer("*Diff*", "".join(data), 
                                  switch_to=True, modename='diff')