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?? classfix.py(5.81 KB)
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?? find_recursionlimit.py(3.39 KB)
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?? findnocoding.py(2.74 KB)
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?? google.py(519 B)
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?? hotshotmain.py(1.45 KB)
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Editing: pathfix.py

#! /usr/bin/python2.7

# Change the #! line occurring in Python scripts.  The new interpreter
# pathname must be given with a -i option.
#
# Command line arguments are files or directories to be processed.
# Directories are searched recursively for files whose name looks
# like a python module.
# Symbolic links are always ignored (except as explicit directory
# arguments).  Of course, the original file is kept as a back-up
# (with a "~" attached to its name).
#
# Undoubtedly you can do this using find and sed or perl, but this is
# a nice example of Python code that recurses down a directory tree
# and uses regular expressions.  Also note several subtleties like
# preserving the file's mode and avoiding to even write a temp file
# when no changes are needed for a file.
#
# NB: by changing only the function fixfile() you can turn this
# into a program for a different change to Python programs...

import sys
import re
import os
from stat import *
import getopt

err = sys.stderr.write
dbg = err
rep = sys.stdout.write

new_interpreter = None

def main():
    global new_interpreter
    usage = ('usage: %s -i /interpreter file-or-directory ...\n' %
             sys.argv[0])
    try:
        opts, args = getopt.getopt(sys.argv[1:], 'i:')
    except getopt.error, msg:
        err(msg + '\n')
        err(usage)
        sys.exit(2)
    for o, a in opts:
        if o == '-i':
            new_interpreter = a
    if not new_interpreter or new_interpreter[0] != '/' or not args:
        err('-i option or file-or-directory missing\n')
        err(usage)
        sys.exit(2)
    bad = 0
    for arg in args:
        if os.path.isdir(arg):
            if recursedown(arg): bad = 1
        elif os.path.islink(arg):
            err(arg + ': will not process symbolic links\n')
            bad = 1
        else:
            if fix(arg): bad = 1
    sys.exit(bad)

ispythonprog = re.compile('^[a-zA-Z0-9_]+\.py$')
def ispython(name):
    return ispythonprog.match(name) >= 0

def recursedown(dirname):
    dbg('recursedown(%r)\n' % (dirname,))
    bad = 0
    try:
        names = os.listdir(dirname)
    except os.error, msg:
        err('%s: cannot list directory: %r\n' % (dirname, msg))
        return 1
    names.sort()
    subdirs = []
    for name in names:
        if name in (os.curdir, os.pardir): continue
        fullname = os.path.join(dirname, name)
        if os.path.islink(fullname): pass
        elif os.path.isdir(fullname):
            subdirs.append(fullname)
        elif ispython(name):
            if fix(fullname): bad = 1
    for fullname in subdirs:
        if recursedown(fullname): bad = 1
    return bad

def fix(filename):
##  dbg('fix(%r)\n' % (filename,))
    try:
        f = open(filename, 'r')
    except IOError, msg:
        err('%s: cannot open: %r\n' % (filename, msg))
        return 1
    line = f.readline()
    fixed = fixline(line)
    if line == fixed:
        rep(filename+': no change\n')
        f.close()
        return
    head, tail = os.path.split(filename)
    tempname = os.path.join(head, '@' + tail)
    try:
        g = open(tempname, 'w')
    except IOError, msg:
        f.close()
        err('%s: cannot create: %r\n' % (tempname, msg))
        return 1
    rep(filename + ': updating\n')
    g.write(fixed)
    BUFSIZE = 8*1024
    while 1:
        buf = f.read(BUFSIZE)
        if not buf: break
        g.write(buf)
    g.close()
    f.close()

# Finishing touch -- move files

# First copy the file's mode to the temp file
    try:
        statbuf = os.stat(filename)
        os.chmod(tempname, statbuf[ST_MODE] & 07777)
    except os.error, msg:
        err('%s: warning: chmod failed (%r)\n' % (tempname, msg))
    # Then make a backup of the original file as filename~
    try:
        os.rename(filename, filename + '~')
    except os.error, msg:
        err('%s: warning: backup failed (%r)\n' % (filename, msg))
    # Now move the temp file to the original file
    try:
        os.rename(tempname, filename)
    except os.error, msg:
        err('%s: rename failed (%r)\n' % (filename, msg))
        return 1
    # Return success
    return 0

def fixline(line):
    if not line.startswith('#!'):
        return line
    if "python" not in line:
        return line
    return '#! %s\n' % new_interpreter

if __name__ == '__main__':
    main()

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Editing: pathfix.py

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