HxUtils: 批量转换换行符，print2to3

在 windows 和 linux 系统，换行符有时需要转换，其代码文件 HxUntils.py 如下：

 ''' HxUtils.py 2018 by x01 '''

import os, sys

def convert_endlines(filepath, tounix=True):
    try:
        oldfile = open(filepath, 'rb+')
        path, name = os.path.split(filepath)
        newfile = open(path + '$' + name, 'ba+')

        old = b'\r'
        new = b''
        if not tounix:
            old = b'\n'
            new = b'\r\n'

        while True:
            olddata = oldfile.read(1024)
            newdata = olddata.replace(old, new)
            newfile.write(newdata)
            if len(olddata) < 1024:
                break
            
        newfile.close()
        oldfile.close()

        os.remove(filepath)
        os.rename(path + '$' + name, filepath)

    except IOError as e:
        print(e)

def convert_endlines_for_dir():
    dirpath, tounix, extname = ('.', True, '.py')
    if len(sys.argv) == 2:
        dirpath = sys.argv[1]
    elif len(sys.argv) == 3:
        dirpath, tounix = (sys.argv[1], sys.argv[2])
    elif len(sys.argv) == 4:
        dirpath, tounix, extname = (sys.argv[1], sys.argv[2], sys.argv[3])

    for (thisdir, subshere, fileshere) in os.walk(dirpath):
        for filename in fileshere:
            if filename.endswith(extname):
                #print(os.path.join(thisdir,filename))
                convert_endlines(os.path.join(thisdir,filename), tounix)

if __name__ == '__main__':
    convert_endlines_for_dir()
    

使用方法如下：

$ python3 HxUntils.py  [dirpath tounix extname]

 python2 的 print 命令替换为 python3 的 print() 函数：

def convert_print(dirpath='.'):
    '''
    转换 python2 中的 print 命令到 python3 
    '''
    if len(sys.argv) == 2:
        dirpath = sys.argv[1]

    for (thisdir, subshere, fileshere) in os.walk(dirpath):
        for filename in fileshere:
            if filename.endswith('.py'):
                print2to3(os.path.join(thisdir,filename))

def print2to3(filename):
    fr = open(filename)
    tempfile = open(filename +'.tmp', 'a+')
    for line in fr:
        tl = replace_line(line)
        tempfile.write(tl)
    fr.close()
    tempfile.close()
    
    os.remove(filename)
    os.rename(filename+'.tmp', filename)

def replace_line(line):
    if 'print(' in line:
        return line

    tl = ''
    pattern = r'(".*?;.*?")|(\'.*?;.*?\')'
    result = re.search(pattern, line)
    if result and ('print ' in line):
        line = line.replace('print ', 'print(')
        line = line[:len(line)-1] + ')' + line[len(line)-1:]
        return line

    if ('print' in line) and (';' not in line):
        index = line.index('print')
        tl += line[:index+5] + '(' + line[index+6:len(line)-1] + ')' + line[len(line)-1:] # endline \n
    elif ('print' in line) and (';' in line):
        i1 = line.index('print')
        i2 = line.index(';')
        tl += line[:i1+5] + '(' + line[i1+6:i2] + ')' + line[i2:]
        if 'print' in line[i2:]:
            tl += replace_line(line[i2:])
    else:
        tl = line

    return tl

 借用 lib2to3 如下，添加 convert_2to3() 到 HxUtils.py 中：

def convert_2to3():
    ''' usage: python3 HxUtils.py -w [dirpath] '''
    import sys
    from lib2to3.main import main

    sys.exit(main("lib2to3.fixes"))