mirror of
https://github.com/python/cpython.git
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aaab30e00c
(with one small bugfix in bgen/bgen/scantools.py) This replaces string module functions with string methods for the stuff in the Tools directory. Several uses of string.letters etc. are still remaining.
148 lines
4.2 KiB
Python
Executable file
148 lines
4.2 KiB
Python
Executable file
#! /usr/bin/env python
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# Change the #! line occurring in Python scripts. The new interpreter
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# pathname must be given with a -i option.
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#
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# Command line arguments are files or directories to be processed.
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# Directories are searched recursively for files whose name looks
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# like a python module.
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# Symbolic links are always ignored (except as explicit directory
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# arguments). Of course, the original file is kept as a back-up
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# (with a "~" attached to its name).
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#
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# Undoubtedly you can do this using find and sed or perl, but this is
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# a nice example of Python code that recurses down a directory tree
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# and uses regular expressions. Also note several subtleties like
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# preserving the file's mode and avoiding to even write a temp file
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# when no changes are needed for a file.
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#
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# NB: by changing only the function fixfile() you can turn this
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# into a program for a different change to Python programs...
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import sys
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import regex
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import os
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from stat import *
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import getopt
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err = sys.stderr.write
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dbg = err
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rep = sys.stdout.write
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new_interpreter = None
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def main():
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global new_interpreter
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usage = ('usage: %s -i /interpreter file-or-directory ...\n' %
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sys.argv[0])
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'i:')
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except getopt.error, msg:
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err(msg + '\n')
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err(usage)
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sys.exit(2)
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for o, a in opts:
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if o == '-i':
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new_interpreter = a
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if not new_interpreter or new_interpreter[0] != '/' or not args:
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err('-i option or file-or-directory missing\n')
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err(usage)
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sys.exit(2)
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bad = 0
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for arg in args:
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if os.path.isdir(arg):
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if recursedown(arg): bad = 1
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elif os.path.islink(arg):
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err(arg + ': will not process symbolic links\n')
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bad = 1
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else:
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if fix(arg): bad = 1
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sys.exit(bad)
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ispythonprog = regex.compile('^[a-zA-Z0-9_]+\.py$')
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def ispython(name):
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return ispythonprog.match(name) >= 0
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def recursedown(dirname):
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dbg('recursedown(' + `dirname` + ')\n')
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bad = 0
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try:
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names = os.listdir(dirname)
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except os.error, msg:
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err(dirname + ': cannot list directory: ' + `msg` + '\n')
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return 1
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names.sort()
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subdirs = []
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for name in names:
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if name in (os.curdir, os.pardir): continue
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fullname = os.path.join(dirname, name)
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if os.path.islink(fullname): pass
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elif os.path.isdir(fullname):
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subdirs.append(fullname)
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elif ispython(name):
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if fix(fullname): bad = 1
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for fullname in subdirs:
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if recursedown(fullname): bad = 1
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return bad
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def fix(filename):
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## dbg('fix(' + `filename` + ')\n')
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try:
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f = open(filename, 'r')
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except IOError, msg:
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err(filename + ': cannot open: ' + `msg` + '\n')
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return 1
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line = f.readline()
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fixed = fixline(line)
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if line == fixed:
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rep(filename+': no change\n')
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f.close()
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return
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head, tail = os.path.split(filename)
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tempname = os.path.join(head, '@' + tail)
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try:
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g = open(tempname, 'w')
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except IOError, msg:
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f.close()
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err(tempname+': cannot create: '+`msg`+'\n')
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return 1
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rep(filename + ': updating\n')
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g.write(fixed)
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BUFSIZE = 8*1024
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while 1:
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buf = f.read(BUFSIZE)
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if not buf: break
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g.write(buf)
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g.close()
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f.close()
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# Finishing touch -- move files
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# First copy the file's mode to the temp file
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try:
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statbuf = os.stat(filename)
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os.chmod(tempname, statbuf[ST_MODE] & 07777)
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except os.error, msg:
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err(tempname + ': warning: chmod failed (' + `msg` + ')\n')
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# Then make a backup of the original file as filename~
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try:
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os.rename(filename, filename + '~')
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except os.error, msg:
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err(filename + ': warning: backup failed (' + `msg` + ')\n')
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# Now move the temp file to the original file
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try:
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os.rename(tempname, filename)
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except os.error, msg:
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err(filename + ': rename failed (' + `msg` + ')\n')
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return 1
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# Return succes
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return 0
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def fixline(line):
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if not line.startswith('#!'):
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return line
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if "python" not in line:
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return line
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return '#! %s\n' % new_interpreter
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main()
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