ushell.py

linux下的一款播放器

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# Source last modified: $Id: ushell.py,v 1.2 2004/07/07 22:00:04 hubbe Exp $
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"""Univeral shell utilities.  These provide file copy, removal, isdir, and
other path and file manipulation using UNIX style paths on all platforms.
All the path translation is done for you, so just program like you're on
a UNIX box and be happy."""

import os
import sys
import string
import getopt
import stat
import re
import posixpath
import glob
try:
    import macfs, MacOS
except:
    pass

import shell


class UniversalShell:
    """Multi-platform shell utilities which do path convsion to use
    UNIX (posix) style paths on all platforms."""

    def exists(self, path):
        return os.path.exists(self.native_path(path))
    
    def isfile(self, path):
        return os.path.isfile(self.native_path(path))

    def isdir(self, path):
        return os.path.isdir(self.native_path(path))

    def islink(self, path):
        return os.path.islink(self.native_path(path))

    def getcwd(self):
        return self.posix_path(os.getcwd())
        
    def ls(self, path):
        ls_list = []

        for item in  os.listdir(self.native_path(path)):
            ls_list.append(self.posix_path(item))

        return ls_list
    
    def cp(self, source_path, destination_path):
        native_source_path = self.native_path(source_path)
        native_destination_path = self.native_path(destination_path)        
        shell.cp(native_source_path, native_destination_path)

    def cpdir(self, source_path, destination_path):
        native_source_path = self.native_path(source_path)
        native_destination_path = self.native_path(destination_path)
        shell.cpdir(native_source_path, native_destination_path)

    def rm(self, path):
        shell.rm(self.native_path(path))
        
    def find(self, path, match, unmatch):
        found_file_list = []

        ## use match/unmatch to filter the find list
        match_re = None
        unmatch_re = None
        
        if len(match):   match_re = re.compile(match)
        if len(unmatch): unmatch_re = re.compile(unmatch)

        ## find stuff
        file_list, dir_list = shell.find(self.native_path(path))
        file_list = file_list + dir_list

        ## if there are no filters
        if not (match_re or unmatch_re):
            for file in file_list:
                found_file_list.append(self.posix_path(file))
            return found_file_list

        ## filter file list
        for file in file_list:
            file = self.posix_path(file)

            if match_re and match_re.match(file):
                found_file_list.append(file)
                continue
            if unmatch_re and unmatch_re.match(file):
                continue
            if not match_re:
                found_file_list.append(file)
            
        return found_file_list

    def chdir(self, path):
        os.chdir(self.native_path(path))

    def mkdir(self, path):
        shell.mkdir(self.native_path(path))

    def run(self, path):
        return shell.run(self.native_path(path))


class POSIXUniversalShell(UniversalShell):
    def posix_path(self, path):
        return path
    
    def native_path(self, path):
        return path


class DOSUniversalShell(UniversalShell):
    posix_path_translation_table = string.maketrans('\\', '/')
    dos_path_translation_table = string.maketrans('/', '\\')
    
    def posix_path(self, path):
        if not len(path): return ''
        return string.translate(path, self.posix_path_translation_table)

    def native_path(self, path):
        if not len(path): return ''
        return string.translate(path, self.dos_path_translation_table)


class MacUniversalShell(UniversalShell):
    def getcwd(self):
        return self.posix_path('%s' % (os.getcwd()))
        
    def posix_path(self, path):
        if not len(path): return ''

        ## absolute or relative path
        #if path[0] == ':' or string.find(path, ':') < 0:
        if path[0] == ':':
            absolute_path_flag = 0
            path = path[1:]
        elif string.find(path, ':') < 0:
            absolute_path_flag = 0
        else:
            absolute_path_flag = 1
            
        if path[-1] == ':':
            directory_flag = 1
            path = path[:-1]
        else:
            directory_flag = 0

        path_list = []
        for path_item in string.split(path, ':'):
            if not len(path_item):
                path_list.append('..')
            else:
                path_list.append(path_item)

        posix_path = string.join(path_list, '/')

        if absolute_path_flag:
            posix_path = '/%s' % (posix_path)
            
        if directory_flag:
            posix_path = '%s/' % (posix_path)

        return posix_path

    def native_path(self, path):
        if not len(path): return ''
        absolute_path_flag = 0

        ## remove any multiple path separators to make parsing easier
        while 1:
            old_path = path
            path = string.replace(path, '//', '/')
            if path == old_path:
                break

        ## recognize a absolute path, chop it off of the posix
        ## path so it won't be translated; set absolute path flag
        ## so we can add the leading colen if this is a relative path
        if path[0] == '/':
            path = path[1:]
            absolute_path_flag = 1

        if path[:2] == './':
            path = path[2:]

        path_list = []
        for item in string.split(path, '/'):
            if item == '..':
                path_list.append('')
            else:
                path_list.append(item)

        mac_path = string.join(path_list, ':')

        ## absolute or relative path
        if not absolute_path_flag:
            mac_path = ':%s' % (mac_path)

        return mac_path


## instace of shell utilities based on platform
_ushell = None

if os.name == 'posix':
    _ushell = POSIXUniversalShell()
elif os.name == 'nt' or os.name == 'dos':
    _ushell = DOSUniversalShell()
elif os.name == 'mac':
    _ushell = MacUniversalShell()


## exported shell utilities
def ls(path = './'):
    return _ushell.ls(path)

def cp(source_path, destination_path):
    _ushell.cp(source_path, destination_path)

def cpdir(source_path, destination_path):
    _ushell.cpdir(source_path, destination_path)
    
def rm(path):
    _ushell.rm(path)

def find(path = './', match = '', unmatch = ''):
    return _ushell.find(path, match, unmatch)

def chdir(path):
    _univeal_shell.chdir(path)

def mkdir(path):
    _ushell.mkdir(path)

def exists(path):
    return _ushell.exists(path)

def isfile(path):
    return _ushell.isfile(path)

def isdir(path):
    return _ushell.isdir(path)

def islink(path):
    return _ushell.islink(path)

def getcwd():
    return _ushell.getcwd()

def posix_path(path):
    return _ushell.posix_path(path)

def native_path(path):
    return _ushell.native_path(path)

## path functions
join = posixpath.join
split = posixpath.split
basename = posixpath.basename

## path constants
curdir = './'
pardir = '../'