# Written by Jelle Roozenburg, Arno Bakker
# see LICENSE.txt for license information

import sys
import commands
   
class LinuxSingleInstanceChecker:
    """ Looks for a process with argument basename.py """
    
    def __init__(self,basename):
        self.basename = basename

    def IsAnotherRunning(self):
        """ Uses pgrep to find other <self.basename>.py processes """
        # If no pgrep available, it will always start the app
        cmd = 'pgrep -fl "%s\.py" | grep -v pgrep' % (self.basename)
        progressInfo = commands.getoutput(cmd)
        
        print >>sys.stderr,"LinuxSingleInstanceChecker returned",progressInfo
        
        numProcesses = len(progressInfo.split('\n'))
        #if DEBUG:
        #    print 'main: ProgressInfo: %s, num: %d' % (progressInfo, numProcesses)
        return numProcesses > 1