[Python-checkins] CVS: python/dist/src/Tools/scripts reindent.py,NONE,1.1
Tim Peters
python-dev@python.org
Wed, 4 Oct 2000 20:48:42 -0700
Update of /cvsroot/python/python/dist/src/Tools/scripts
In directory slayer.i.sourceforge.net:/tmp/cvs-serv2756
Added Files:
reindent.py
Log Message:
New tool for normalizing indentation of .py files.
--- NEW FILE ---
#! /usr/bin/env python
# Released to the public domain, by Tim Peters, 03 October 2000.
"""reindent [-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; else no output.
Change Python (.py) files to use 4-space indents and no hard tab characters.
Also trim excess whitespace from ends of lines, and empty lines at the ends
of files. Ensure the last line ends with a newline.
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 reindent finds nothing to change, the file is left alone. If reindent
does change a file, the changed file is a fixed-point for reindent (i.e.,
running reindent on the resulting .py file won't change it again).
The hard part of reindenting is figuring out what to do with comment
lines. So long as the input files get a clean bill of health from
tabnanny.py, reindent should do a good job.
"""
__version__ = "1"
import tokenize
import os
import sys
verbose = 0
recurse = 0
dryrun = 0
def errprint(*args):
sep = ""
for arg in args:
sys.stderr.write(sep + str(arg))
sep = " "
sys.stderr.write("\n")
def main():
import getopt
global verbose, recurse, dryrun
try:
opts, args = getopt.getopt(sys.argv[1:], "drv")
except getopt.error, 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, "...",
try:
f = open(file)
except IOError, msg:
errprint("%s: I/O Error: %s" % (file, str(msg)))
return
r = Reindenter(f)
f.close()
if r.run():
if verbose:
print "changed."
if dryrun:
print "But this is a dry run, so leaving it alone."
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
f = open(file, "w")
r.write(f)
f.close()
if verbose:
print "wrote new", file
else:
if verbose:
print "unchanged."
class Reindenter:
def __init__(self, f):
self.find_stmt = 1 # next token begins a fresh stmt?
self.level = 0 # current indent level
# Raw file lines.
self.raw = f.readlines()
# File lines, rstripped & tab-expanded. Dummy at start is so
# that we can use tokenize's 1-based line numbering easily.
# Note that a line is all-blank iff it's "\n".
self.lines = [line.rstrip().expandtabs() + "\n"
for line in self.raw]
self.lines.insert(0, None)
self.index = 1 # index into self.lines of next line
# List of (lineno, indentlevel) pairs, one for each stmt and
# comment line. indentlevel is -1 for comment lines, as a
# signal that tokenize doesn't know what to do about them;
# indeed, they're our headache!
self.stats = []
def run(self):
tokenize.tokenize(self.getline, self.tokeneater)
# Remove trailing empty lines.
lines = self.lines
while lines and lines[-1] == "\n":
lines.pop()
# Sentinel.
stats = self.stats
stats.append((len(lines), 0))
# Map count of leading spaces to # we want.
have2want = {}
# Program after transformation.
after = self.after = []
for i in range(len(stats)-1):
thisstmt, thislevel = stats[i]
nextstmt = stats[i+1][0]
have = getlspace(lines[thisstmt])
want = thislevel * 4
if want < 0:
# A comment line.
if have:
# An indented comment line. If we saw the same
# indentation before, reuse what it most recently
# mapped to.
want = have2want.get(have, -1)
if want < 0:
# Then it probably belongs to the next real stmt.
for j in xrange(i+1, len(stats)-1):
jline, jlevel = stats[j]
if jlevel >= 0:
if have == getlspace(lines[jline]):
want = jlevel * 4
break
if want < 0: # Maybe it's a hanging
# comment like this one,
# in which case we should shift it like its base
# line got shifted.
for j in xrange(i-1, -1, -1):
jline, jlevel = stats[j]
if jlevel >= 0:
want = have + getlspace(after[jline-1]) - \
getlspace(lines[jline])
break
if want < 0:
# Still no luck -- leave it alone.
want = have
else:
want = 0
assert want >= 0
have2want[have] = want
diff = want - have
if diff == 0 or have == 0:
after.extend(lines[thisstmt:nextstmt])
else:
for line in lines[thisstmt:nextstmt]:
if diff > 0:
if line == "\n":
after.append(line)
else:
after.append(" " * diff + line)
else:
remove = min(getlspace(line), -diff)
after.append(line[remove:])
return self.raw != self.after
def write(self, f):
f.writelines(self.after)
# Line-getter for tokenize.
def getline(self):
if self.index >= len(self.lines):
line = ""
else:
line = self.lines[self.index]
self.index += 1
return line
# Line-eater for tokenize.
def tokeneater(self, type, token, (sline, scol), end, line,
INDENT=tokenize.INDENT,
DEDENT=tokenize.DEDENT,
NEWLINE=tokenize.NEWLINE,
COMMENT=tokenize.COMMENT,
NL=tokenize.NL):
if type == NEWLINE:
# A program statement, or ENDMARKER, will eventually follow,
# after some (possibly empty) run of tokens of the form
# (NL | COMMENT)* (INDENT | DEDENT+)?
self.find_stmt = 1
elif type == INDENT:
self.find_stmt = 1
self.level += 1
elif type == DEDENT:
self.find_stmt = 1
self.level -= 1
elif type == COMMENT:
if self.find_stmt:
self.stats.append((sline, -1))
# but we're still looking for a new stmt, so leave
# find_stmt alone
elif type == NL:
pass
elif self.find_stmt:
# This is the first "real token" following a NEWLINE, so it
# must be the first token of the next program statement, or an
# ENDMARKER.
self.find_stmt = 0
if line: # not endmarker
self.stats.append((sline, self.level))
# Count number of leading blanks.
def getlspace(line):
i, n = 0, len(line)
while i < n and line[i] == " ":
i += 1
return i
if __name__ == '__main__':
main()