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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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#This file is part of Beremiz, a Integrated Development Environment for

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#programming IEC 61131-3 automates supporting plcopen standard and CanFestival. 

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#

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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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#

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#See COPYING file for copyrights details.

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#

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#This library is free software; you can redistribute it and/or

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#modify it under the terms of the GNU General Public

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#License as published by the Free Software Foundation; either

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#version 2.1 of the License, or (at your option) any later version.

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#

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#This library is distributed in the hope that it will be useful,

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#but WITHOUT ANY WARRANTY; without even the implied warranty of

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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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#General Public License for more details.

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#

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#You should have received a copy of the GNU General Public

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#License along with this library; if not, write to the Free Software

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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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import time

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import wx

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import subprocess, ctypes

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import threading

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import os

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if os.name == 'posix':

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    from signal import SIGTERM, SIGKILL

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class outputThread(threading.Thread):

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    """

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    Thread is used to print the output of a command to the stdout

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    """

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    def __init__(self, Proc, fd, callback=None, endcallback=None):

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        threading.Thread.__init__(self)

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        self.killed = False

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        self.finished = False

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        self.retval = None

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        self.Proc = Proc

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        self.callback = callback

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        self.endcallback = endcallback

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        self.fd = fd

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    def run(self):

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        outchunk = None

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        self.retval = None

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        while outchunk != '' and not self.killed :

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            outchunk = self.fd.readline()

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            if self.callback : self.callback(outchunk)

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        while self.retval is None and not self.killed :

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            self.retval = self.Proc.poll()

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            outchunk = self.fd.readline()

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            if self.callback : self.callback(outchunk)

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        while outchunk != '' and not self.killed :

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            outchunk = self.fd.readline()

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        if self.endcallback:

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            try:

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                err = self.Proc.wait()

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            except:

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                err = self.retval

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            self.finished = True

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            wx.CallAfter(self.endcallback, self.Proc.pid, err)

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class ProcessLogger:

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    def __init__(self, logger, Command, finish_callback=None, no_stdout=False, no_stderr=False, no_gui=True):

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        self.logger = logger

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        self.Command_str = Command

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        self.Command = []

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        for i,word in enumerate(Command.replace("'",'"').split('"')):

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            if i % 2 == 0:

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                word = word.strip()

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                if len(word) > 0:

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                    self.Command.extend(word.split())

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            else:

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                self.Command.append(word)

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        self.finish_callback = finish_callback

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        self.no_stdout = no_stdout

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        self.no_stderr = no_stderr

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        self.startupinfo = None

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        self.errlen = 0

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        self.outlen = 0

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        self.exitcode = None

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        self.outdata = ""

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        self.errdata = ""

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        self.finished = False

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        popenargs= {

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               "cwd":os.getcwd(),

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               "stdin":subprocess.PIPE, 

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               "stdout":subprocess.PIPE, 

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               "stderr":subprocess.PIPE}

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        if no_gui == True and wx.Platform == '__WXMSW__':

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            self.startupinfo = subprocess.STARTUPINFO()

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            self.startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW

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            popenargs["startupinfo"] = self.startupinfo

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        elif wx.Platform == '__WXGTK__':

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            popenargs["shell"] = False  #True

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        self.Proc = subprocess.Popen( self.Command, **popenargs )

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        self.outt = outputThread(

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                      self.Proc,

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                      self.Proc.stdout,

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                      self.output,

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                      self.finish) 

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        self.outt.start()

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        self.errt = outputThread(

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                      self.Proc,

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                      self.Proc.stderr,

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                      self.errors)

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        self.errt.start()

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    def output(self,v):

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        self.outdata += v

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        self.outlen += 1

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        if not self.no_stdout:

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            wx.CallAfter(self.logger.write,v)

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    def errors(self,v):

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        self.errdata += v

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        self.errlen += 1

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        if not self.no_stderr:

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            wx.CallAfter(self.logger.write_warning,v)

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    def log_the_end(self,ecode,pid):

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        self.logger.write(self.Command_str + "\n")

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        self.logger.write_warning("exited with status %s (pid %s)\n"%(str(ecode),str(pid)))

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    def finish(self, pid,ecode):

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        self.finished = True

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        self.exitcode = ecode

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        if self.exitcode != 0:

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            wx.CallAfter(self.log_the_end,ecode,pid)

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        if self.finish_callback is not None:

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            self.finish_callback(self,ecode,pid)

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    def kill(self,gently=True):

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        self.outt.killed = True

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        self.errt.killed = True

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        if wx.Platform == '__WXMSW__':

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            PROCESS_TERMINATE = 1

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            handle = ctypes.windll.kernel32.OpenProcess(PROCESS_TERMINATE, False, self.Proc.pid)

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            ctypes.windll.kernel32.TerminateProcess(handle, -1)

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            ctypes.windll.kernel32.CloseHandle(handle)

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        else:

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            if gently:

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                sig=SIGTERM

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            else:

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                sig=SIGKILL

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            try:

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                os.kill(self.Proc.pid, sig)

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            except:

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                pass

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        self.outt.join()

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        self.errt.join()

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    def spin(self, timeout=None, out_limit=None, err_limit=None, keyword = None, kill_it = True):

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        count = 0

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        while not self.finished:

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            if err_limit and self.errlen > err_limit:

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                break

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            if out_limit and self.outlen > out_limit:

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                break

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            if timeout:

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                if count > timeout:

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                    break

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                count += 1

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            if keyword and self.outdata.find(keyword)!=-1:

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                    break

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            wx.Yield()

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            time.sleep(0.01)

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        if not self.outt.finished and kill_it:

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            self.kill()

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        return [self.exitcode, self.outdata, self.errdata]

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