#!/usr/bin/env python3
import argparse , sys
# create parser
parser = argparse.ArgumentParser(
         description='count occurence of a string in a text file',
         epilog = 'please report comments/bugs to arlotto@univ-tln.fr')

#position 1 required
parser.add_argument('filename')

#position 2 optional count total number of chars if not given
parser.add_argument('string', nargs='?',default='')

#option case sensitive
parser.add_argument('-i','--ignorecase', 
                    action='store_true',help='ignore case when search')

args = parser.parse_args()

#~ print(args)
filename = args.filename
string   = args.string
ignorecase = args.ignorecase

try :
    f=open(filename)
except :
    print('Unable to open',filename)
    sys.exit(-1)


if string == '' :
    n=0
    while 1 :
        c=f.read(1)
        if c=='':
            break
        n+=1
    print(n)
    sys.exit(0)

# brute force algorithm
if ignorecase == True :
    string = string.upper()
i=0
n=0
while 1 :
    c=f.read(1)
    if c =='':
        break
    if ignorecase == True :
        c = c.upper()    
    if c==string[i] :
        i+=1
    else :
        i=0
    if i==len(string) :
        n+=1
        i=0
    elif i > len(string) :
        print('ooops internal error!')
        sys.exit(-1)
print(n)