logexector.py

## simple logchecker by dertom and heavy stackoverflowing ;)
## can be used with vanilla python: https://www.python.org/ftp/python/3.7.2/python-3.7.2.exe
## or blender's python: [blender-folder]/2.79/python/bin/python.exe
##
## just call: python.exe logexecuter.py
import time
import subprocess

# the logfile to check 
logfile = "./log.txt"
# the work folder where the batch file gets executed
workFolder ="e:\\win"
# the batch filename
batchfile = "e:\\batch2.bat"
# the match to search for
logmatch = "QUIT HERE"
# keep on tracking after match. caution: log-file might be locked and can only deleted if process got quit
breakOnMatch = True
# output log checker
doOutput = False

def follow(thefile):
    thefile.seek(0,2)
    while True:
        line = thefile.readline()
        if not line:
            time.sleep(0.1)
            continue
        yield line

if __name__ == '__main__':
    logfile = open(logfile,"r")
    loglines = follow(logfile)
    for line in loglines:
        if line==logmatch:
            p1 = subprocess.Popen([batchfile],cwd=workFolder) 
            p1.wait()
            print("called batch...")
            if (breakOnMatch):
                break
        else:
            if doOutput:
                print(line)