import sys
import os
import re
import json
import csv

def sortit(data):
    d=data[fieldsc['column X']]
    return d


def one_file(root, name, filename):

    if (not re.search(r"\.(txt|csv|json)$", filename)):
    	 return

    print (filename, file=sys.stderr)

    fs = os.stat(filename).st_size
    if fs==0:
        print (" -> Empty file!", file=sys.stderr)
        return

    # PE file
    try:
        p = pefile.PE(filename)
        ...
    except:
        pass

    with open(filename, "r", encoding="utf-8") as f:

        # binary file
        data = f.read()
        print (data)

        # binary file + regex scan
        data = f.read()
        for m in re.finditer(r"(echo..)", data, re.IGNORECASE):
            s = m.start()
            e = m.end()
            t = data[s:e]
            print (t)

        # text file - line by line
        line = f.readline()
        while line != '':
            print(line, end='')
            line = f.readline()

        # JSON file
        data = json.load(f)
        objdata=data['objects']
        for o in objdata:
        	  ...

        # CSV file with a Header
        csvreader = csv.reader(f)

        fields = next(csvreader)

        fieldsc = {}

        noc = 0
        for f in fields:
            fieldsc[f] = noc
            noc = noc + 1

        rows = []
        for row in csvreader:
            rows.append(row)
            print (row)

        nor = csvreader.line_num

        rows.sort(key=sortit) #,  reverse=True)

        f.close()

try:
    arg1 = sys.argv[1]
except IndexError:
    arg1 = "."

if os.path.isdir(arg1):

   for (root, dirs, files) in os.walk(arg1, onerror=None, topdown=False, followlinks=False):
       for name in files:
     	    filename  = os.path.join(root, name)
     	    one_file (root, name, filename)

elif os.path.isfile(arg1):
	 one_file ('.', filename, filename)