#!/usr/bin/python

"""Generic mon echoer

usage: gmon [--format=<format>] [-p|--plain] [-x|--xgp] <command> [<args>...]

Options:
    -c, --chars     specify limit in characters
    --format <format>   specify format: plain is a plain text, xgp
                        is specific for xfce4-genmon-plugin
    -p, --plain     same as --format=plain
    -x, --xgp       same as --format=xgp
    -h, --help      show this screen
    --version       show version
"""

import os
import sys
import imp

import docopt


class PluginData(object):

    def __init__(self, cmdargs):
        self.args = []
        self.fmt = "plain"
        self.maxlen = 40
        self.name = ""
        self._load(cmdargs)

    def _load(self, cmdargs):
        if cmdargs['--plain']:
            self.fmt = "plain"
        elif cmdargs['--xgp']:
            self.fmt = "xgp"
        self.name = cmdargs['<command>']
        self.args = cmdargs['<args>']


class Subcommand(object):

    def __init__(self, args, pluginpath):
        self.plugindata = PluginData(args)
        self.name = args['<command>']
        self._load_plugin(pluginpath)

    def _load_plugin(self, pluginpath):
        modpath = "%s/%s.py" % (pluginpath, self.name)
        with open(modpath) as fh:
            module = imp.load_module(self.name, fh, modpath,
                                     (".py", "r", imp.PY_SOURCE))
        self.plugin = module.Plugin(self.plugindata)

    def _format_output(self, raw):
        suffix = "..."
        cooked = raw
        if self.plugindata.fmt == "plain":
            if len(raw) > self.plugindata.maxlen:
                newlen = self.plugindata.maxlen - len(suffix)
                cooked = raw[:newlen] + suffix
        return cooked

    def get_output(self):
        return self._format_output(self.plugin.render())


class App:

    def __init__(self, args):
        self._set_pluginpath()
        self.subcommand = Subcommand(args, self.pluginpath)

    def _set_pluginpath(self):
        mypath = os.path.dirname(os.path.realpath(sys.argv[0]))
        path = mypath + "/plugins"
        path = os.environ.get("GMON_PLUGINS", path)
        self.pluginpath = path

    def run(self):
        print self.subcommand.get_output()


if __name__ == '__main__':

    args = docopt.docopt(__doc__,
                         version="gmon 0.1",
                         options_first=True)
    app = App(args)
    app.run()