#This python codes reads a file and search for an specified keywords. Based on
# the line number of the line containing that keyword, it moves few lines back-
# ward or forward to seach for another keywords and then prints the entire line
# containing that keyword.
#
#Get Line Number of certain phrase in file Python
#
#Add a counter to the line number
#
#Move the position of a file pointer by specified number of line
# -----------------------------------------------------------------------------
import sys, os
import numpy as np

lnum = 0
#Number of lines to move backward from the line containing identified keyword
ldel = 2

#Keywords
stg = "Heat Flux"

lbak = ldel + 1
#Get input file
inFile = str(sys.argv[1])

f = open(inFile, "r")
lnLst = f.readlines()
f.close()

with open(inFile) as f:
	while line := f.readline():
		lnum = lnum + 1
		if stg in line:
			print(line.rstrip(), "at line ->", lnum)
			if lnum > ldel:
				print(lnLst[lnum-lbak].rstrip())
				print("-------------------------------------------------------")