from subprocess import Popen, PIPE, STDOUT

from method import Method, Argument
from method.vc import VcBlame
import re

class HgBlame(VcBlame):
    """Show buffer annotated with hg metadata"""
    line_re = re.compile(r'^ *(?P<user>[^ ]+) (?P<rev>\d+) (?P<date>\d{4}-\d{2}-\d{2}): (?P<content>.*)\n$')
    prefix_fmt = '[b:d:*]%(rev)-5s [c:d:*]%(user)-10s [b:d:*]%(date)10s[d:d:*]'
    _is_method = True
    def _open_pipe(self, w, **vargs):
        cmd = ("hg", 'blame', '-nudq', w.buffer.path)
        return Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE)

class HgLog(Method):
    """Show hg log for this buffer"""
    def _execute(self, w, **vargs):
        w.set_error("unimplemented")

class HgDiff(Method):
    """Diff the current file with the version in Mercurial"""
    def _execute(self, w, **vargs):
        try:
            from mercurial import hg, ui
            from mercurial import commands as hgc
        except ImportError:
            w.set_error("Mecurial is not installed")
            return
        
        if not hasattr(w.buffer, 'path'):
            w.set_error("Buffer has no corresponding file")
            return
        ui_imp = ui.ui(verbose=True)
        ui_imp.pushbuffer()
        repo = hg.repository(ui=ui_imp, path='.')
        hgc.diff(ui_imp, repo, w.buffer.path)
        s = ''.join(ui_imp.popbuffer())
        w.application.data_buffer("*Diff*", s, switch_to=True, modename='diff')