#!/usr/bin/python
# Copyright 2011  Lars Wirzenius
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import cliapp
import subprocess


class Disp(cliapp.Application):

    def runcmd(self, *args):
        p = subprocess.Popen(args, stdout=subprocess.PIPE)
        out, err = p.communicate('')
        if p.returncode:
            raise Exception('command failed')
        return out

    def hpixels(self, mode):
        return int(mode.split('x')[0])

    def process_args(self, args):
        monitors = []
        best = None
        mode = None
        
        s = self.runcmd('xrandr', '-q')
        current = None
        for line in s.splitlines():
            w = line.split()
            if w[1] == 'connected':
                monitors.append(w[0])
                current = w[0]
            elif line.startswith('   '):
                if not mode or self.hpixels(mode) < self.hpixels(w[0]):
                    best = current
                    mode = w[0]

        if not monitors:
            raise Exception('No monitors')
        
        args = ['xrandr', '--output', best, '--mode', mode]
        for m in monitors:
            if m != best:
                args += ['--output', m, '--same-as', best]
        
        self.runcmd(*args)


Disp().run()