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#! /usr/bin/env python3
"""cleanfuture [-d][-r][-v] path ...
-d Dry run. Analyze, but don't make any changes to, files.
-r Recurse. Search for all .py files in subdirectories too.
-v Verbose. Print informative msgs.
Search Python (.py) files for future statements, and remove the features
from such statements that are already mandatory in the version of Python
you're using.
Pass one or more file and/or directory paths. When a directory path, all
.py files within the directory will be examined, and, if the -r option is
given, likewise recursively for subdirectories.
Overwrites files in place, renaming the originals with a .bak extension. If
cleanfuture finds nothing to change, the file is left alone. If cleanfuture
does change a file, the changed file is a fixed-point (i.e., running
cleanfuture on the resulting .py file won't change it again, at least not
until you try it again with a later Python release).
Limitations: You can do these things, but this tool won't help you then:
+ A future statement cannot be mixed with any other statement on the same
physical line (separated by semicolon).
+ A future statement cannot contain an "as" clause.
Example: Assuming you're using Python 2.2, if a file containing
from __future__ import nested_scopes, generators
is analyzed by cleanfuture, the line is rewritten to
from __future__ import generators
because nested_scopes is no longer optional in 2.2 but generators is.
"""
import __future__
import tokenize
import os
import sys
dryrun = 0
recurse = 0
verbose = 0
def errprint(*args):
strings = map(str, args)
msg = ' '.join(strings)
if msg[-1:] != '\n':
msg += '\n'
sys.stderr.write(msg)
def main():
import getopt
global verbose, recurse, dryrun
try:
opts, args = getopt.getopt(sys.argv[1:], "drv")
except getopt.error as msg:
errprint(msg)
return
for o, a in opts:
if o == '-d':
dryrun += 1
elif o == '-r':
recurse += 1
elif o == '-v':
verbose += 1
if not args:
errprint("Usage:", __doc__)
return
for arg in args:
check(arg)
def check(file):
if os.path.isdir(file) and not os.path.islink(file):
if verbose:
print("listing directory", file)
names = os.listdir(file)
for name in names:
fullname = os.path.join(file, name)
if ((recurse and os.path.isdir(fullname) and
not os.path.islink(fullname))
or name.lower().endswith(".py")):
check(fullname)
return
if verbose:
print("checking", file, "...", end=' ')
try:
f = open(file)
except IOError as msg:
errprint("%r: I/O Error: %s" % (file, str(msg)))
return
with f:
ff = FutureFinder(f, file)
changed = ff.run()
if changed:
ff.gettherest()
if changed:
if verbose:
print("changed.")
if dryrun:
print("But this is a dry run, so leaving it alone.")
for s, e, line in changed:
print("%r lines %d-%d" % (file, s+1, e+1))
for i in range(s, e+1):
print(ff.lines[i], end=' ')
if line is None:
print("-- deleted")
else:
print("-- change to:")
print(line, end=' ')
if not dryrun:
bak = file + ".bak"
if os.path.exists(bak):
os.remove(bak)
os.rename(file, bak)
if verbose:
print("renamed", file, "to", bak)
with open(file, "w") as g:
ff.write(g)
if verbose:
print("wrote new", file)
else:
if verbose:
print("unchanged.")
class FutureFinder:
def __init__(self, f, fname):
self.f = f
self.fname = fname
self.ateof = 0
self.lines = [] # raw file lines
# List of (start_index, end_index, new_line) triples.
self.changed = []
# Line-getter for tokenize.
def getline(self):
if self.ateof:
return ""
line = self.f.readline()
if line == "":
self.ateof = 1
else:
self.lines.append(line)
return line
def run(self):
STRING = tokenize.STRING
NL = tokenize.NL
NEWLINE = tokenize.NEWLINE
COMMENT = tokenize.COMMENT
NAME = tokenize.NAME
OP = tokenize.OP
changed = self.changed
get = tokenize.generate_tokens(self.getline).__next__
type, token, (srow, scol), (erow, ecol), line = get()
# Chew up initial comments and blank lines (if any).
while type in (COMMENT, NL, NEWLINE):
type, token, (srow, scol), (erow, ecol), line = get()
# Chew up docstring (if any -- and it may be implicitly catenated!).
while type is STRING:
type, token, (srow, scol), (erow, ecol), line = get()
# Analyze the future stmts.
while 1:
# Chew up comments and blank lines (if any).
while type in (COMMENT, NL, NEWLINE):
type, token, (srow, scol), (erow, ecol), line = get()
if not (type is NAME and token == "from"):
break
startline = srow - 1 # tokenize is one-based
type, token, (srow, scol), (erow, ecol), line = get()
if not (type is NAME and token == "__future__"):
break
type, token, (srow, scol), (erow, ecol), line = get()
if not (type is NAME and token == "import"):
break
type, token, (srow, scol), (erow, ecol), line = get()
# Get the list of features.
features = []
while type is NAME:
features.append(token)
type, token, (srow, scol), (erow, ecol), line = get()
if not (type is OP and token == ','):
break
type, token, (srow, scol), (erow, ecol), line = get()
# A trailing comment?
comment = None
if type is COMMENT:
comment = token
type, token, (srow, scol), (erow, ecol), line = get()
if type is not NEWLINE:
errprint("Skipping file %r; can't parse line %d:\n%s" %
(self.fname, srow, line))
return []
endline = srow - 1
# Check for obsolete features.
okfeatures = []
for f in features:
object = getattr(__future__, f, None)
if object is None:
# A feature we don't know about yet -- leave it in.
# They'll get a compile-time error when they compile
# this program, but that's not our job to sort out.
okfeatures.append(f)
else:
released = object.getMandatoryRelease()
if released is None or released <= sys.version_info:
# Withdrawn or obsolete.
pass
else:
okfeatures.append(f)
# Rewrite the line if at least one future-feature is obsolete.
if len(okfeatures) < len(features):
if len(okfeatures) == 0:
line = None
else:
line = "from __future__ import "
line += ', '.join(okfeatures)
if comment is not None:
line += ' ' + comment
line += '\n'
changed.append((startline, endline, line))
# Loop back for more future statements.
return changed
def gettherest(self):
if self.ateof:
self.therest = ''
else:
self.therest = self.f.read()
def write(self, f):
changed = self.changed
assert changed
# Prevent calling this again.
self.changed = []
# Apply changes in reverse order.
changed.reverse()
for s, e, line in changed:
if line is None:
# pure deletion
del self.lines[s:e+1]
else:
self.lines[s:e+1] = [line]
f.writelines(self.lines)
# Copy over the remainder of the file.
if self.therest:
f.write(self.therest)
if __name__ == '__main__':
main()
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