laditools/bin/ladilog

#!/usr/bin/python

# LADITools - Linux Audio Desktop Integration Tools
# ladilog - A log viewer for your Linux Audio Desktop
# Copyright (C) 2007-2010, Marc-Olivier Barre <marco@marcochapeau.org>
# Copyright (C) 2007-2009, Nedko Arnaudov <nedko@arnaudov.name>
#
# 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 os
import sys
from subprocess import Popen, PIPE
import pty
from signal import SIGTERM
import termios
import tty
import gettext

try:
    import imp
    imp.find_module('laditools')
except ImportError:
    # Running from the build tree?
    sys.path.insert(0, os.path.join(sys.path[0], os.pardir))

import laditools
gettext.install(laditools.__name__)

try:
    from gobject import timeout_add
    import pygtk
    pygtk.require ('2.0')
    import gtk
    import vte
except Exception as e:
    error = gtk.MessageDialog (None, gtk.DIALOG_MODAL, gtk.MESSAGE_ERROR, gtk.BUTTONS_OK, _("You need to get you dependencies right before you run this program. Ask your package maintainer why this is happening to you\n%s") % repr(e))
    error.run ()
    exit (1)

# Default configuration
max_lines_default = 100

# Output the last <lines> lines
def read_last(lfile, lines):
    chunk_size = lines * 60
    lfile.seek(0, 2)
    endpos = lfile.tell()
    pos = endpos - chunk_size
    if pos < 0:
        pos = 0
    backlog = ''
    backlog_size = 0
    lines += 1
    while pos >= 0 and backlog_size <= lines:
        lfile.seek(pos, 0)
        s = lfile.read(chunk_size)
        pos = pos - chunk_size
        backlog_size += s.count("\n")
        backlog = s + backlog
    backlog = backlog.strip().split("\n")
    if len(backlog) > lines:
        backlog = backlog[-lines:]
    lfile.seek(endpos, 0)
    return backlog

class ladilog(object):
    def __init__ (self):
        self.log_files = [
            {
            'name': 'JACK',
            'config_name': 'jackdbus_log',
            'config_default': os.sep.join([os.environ['HOME'], ".log", "jack", "jackdbus.log"])
            },
            {
            'name': 'LADISH',
            'config_name': 'ladish_log',
            'config_default': os.sep.join([os.environ['HOME'], ".log", "ladish", "ladish.log"])
            },
            {
            'name': 'A2J',
            'config_name': 'a2j_log',
            'config_default': os.sep.join([os.environ['HOME'], ".log", "a2j", "a2j.log"])
            }
            ]
        # Handle the configuration
        self.global_config = laditools.config ()
        self.param_dict = self.global_config.get_config_section ('ladilog')

        for log in self.log_files:
            if self.param_dict != None:
                if log['config_name'] not in self.param_dict:
                    self.param_dict[log['config_name']] = log['config_default']
            else:
                self.param_dict = {}
                self.param_dict[log['config_name']] = log['config_default']

        if 'max_lines' not in self.param_dict:
            self.param_dict['max_lines'] = max_lines_default

        for log in self.log_files[:]:
            log['logfile_path'] = self.param_dict[log['config_name']]
            # skip logfiles that dont exist
            if not os.access(log['logfile_path'], os.R_OK):
                self.log_files.remove(log)
                print(_("Skipping '%s' because it does not exist") % log['logfile_path'])
            else:
                print(_("Watching '%s'") % log['logfile_path'])

        max_lines_text = self.param_dict['max_lines']
        self.max_lines = int (max_lines_text)
        # Load the glade file
        builder = gtk.Builder()
        builder.add_from_file(laditools.find_data_file("ladilog_ui.ui"))
        # Get the ui ready for action
        self.event_dict = {"on_ladilog_ui_destroy" : self.on_quit,
            "on_close_button_clicked" : self.on_quit,
            "on_clear_button_clicked" : self.on_clear_text,
            "on_purge_button_clicked" : self.on_purge}
        builder.connect_signals(self.event_dict)

        # Create our terminal and display it
        for log in self.log_files:
            log['term'] = vte.Terminal ()
            log["tab_label"] = gtk.Label (log["name"])

        self.logview_notebook = builder.get_object ("ladilog_notebook")

        for log in self.log_files:
            log['term'].show ()

        # Make it do something...
        for log in self.log_files:
            try:
                log['log_file'] = open(log['logfile_path'], "rb")
                lines = read_last(log['log_file'], self.max_lines)
                for line in lines:
                    line = line.strip('\r\n') + '\r\n'
                    log["term"].feed(line)

            except ValueError:
                print(_("You called Popen with invalid arguments... dumbass"))
            except:
                print(_("Unexpected error:"), sys.exc_info ()[0])

        for log in self.log_files:
            self.logview_notebook.append_page (log["term"])
            self.logview_notebook.set_tab_label (log["term"], log["tab_label"])

        self.auto_updater = timeout_add(250, self.update)

    def update(self):
        # Append latest output to the buffer
        for log in self.log_files:
            line = log['log_file'].readline()
            while line:
                log["term"].feed(line + '\r')
                line = log['log_file'].readline()
            log['log_file'].seek(log['log_file'].tell())
        return True

    def on_quit (self, data=None):
        gtk.main_quit ()

    def on_clear_text (self, data=None):
        current_view = self.logview_notebook.get_current_page ()
        self.log_files[current_view]["term"].feed ("\033[2J\033[;f")


    def on_purge (self, data=None):
        current_view = self.logview_notebook.get_current_page ()
        # Opens the file in write anew mode thus clearing the file and close it right away
        open (self.log_files[current_view]['logfile_path'], "w+")
        self.log_files[current_view]["term"].feed ("\033[2J\033[;f")

    def run (self):
        gtk.main ()
        self.global_config.set_config_section ("ladilog", self.param_dict)
        self.global_config.save ()
        return 0

try:
    ladilog().run()
except Exception as e:
    error = gtk.MessageDialog(None, gtk.DIALOG_MODAL, gtk.MESSAGE_ERROR, gtk.BUTTONS_OK, _("Unexpected error\n\n") + repr(e))
    error.run()
    exit(1)