fixed wordpress rss error with blank lines

fix-wordpress-rs.py

#!/usr/bin/env python3
#-*- coding:utf-8 -*-
#author: adyliu(imxylz@gmail.com)
#version: 0.1

import os
import os.path
import sys

DEBUG='--debug' in sys.argv
FIX  ='--fix' in sys.argv
SUFFIX='.php'
ENCODING='utf-8'

if len(sys.argv) < 2:
    print('Usage: [--debug] [--fix] <file>')
    sys.exit(1)

def checkdir(filepath):
    if DEBUG: print('check file',filepath)
    if os.path.isdir(filepath):
        for fname in os.listdir(filepath):
            checkdir(os.path.join(filepath,fname))
    if os.path.isfile(filepath) and filepath.endswith(SUFFIX):
        fail=True
        fixedmsg = ''
        try:
            lines=[]
            with open(filepath,'r',encoding=ENCODING,errors='ignore') as f:
                lines=f.readlines()
                fail=len(lines)>0 and (len(lines[0].strip())==0 or len(lines[-1].strip()) ==0)
            if fail and FIX:
                start,end = 0,0
                for i in range(len(lines)):
                    if len(lines[i].strip()) >0:
                        start = i
                        break
                i=len(lines)
                while i> 0:
                    if len(lines[i-1].strip()) >0:
                        end = i
                        break
                    i -= 1
                
                with open(filepath,'w',encoding=ENCODING) as f:
                    for line in lines[start:end]:
                        if DEBUG: print(line)
                        f.write(line)
                if DEBUG: print('write lines[%s:%s], total=%s'%(start,end,len(lines)))
                fixedlines = start + len(lines) - end 
                fixedmsg = 'FIXED %s lines' % (fixedlines,)
                       
        finally:
            if DEBUG or fail:
                print(filepath,'=>','FAIL' if fail else 'OK',fixedmsg)

checkdir(os.path.abspath(sys.argv[-1]))