/usr/lib/python2.7/dist-packages/xxdiff/selectfiles.py is in xxdiff-scripts 1:4.0.1+dfsg-1.
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"""
Functions to select files within directories.
"""
__author__ = 'Martin Blais <blais@furius.ca>'
# stdlib imports.
import sys, os, re, optparse
from os.path import join, isfile, exists
def options_graft(parser):
"""
Adds a new option group for file selection options to the given parser and
returns this new group.
"""
group = optparse.OptionGroup(parser, "File selection options",
"These options affect which files are "
"selected for grepping in the first place.")
def regexp_cb(option, opt_str, value, parser):
"Compile and set the regular expression"
try:
regexp = re.compile(value)
getattr(parser.values, option.dest).append(regexp)
except re.error, e:
raise optparse.OptionValueError(
"compiling regular expression '%s': %s" % (value, e))
for oshort, olong, ohelp in (
('-s', '--select',
"Adds a regular expression for filenames to process."),
('-I', '--ignore',
"Adds a regular expression for filenames to ignore."),
):
group.add_option(oshort, olong,
action='callback', type='str', callback=regexp_cb,
metavar="REGEXP", default=[],
help=ohelp)
# Note: we could improve this as soon as Python will include a more recent
# version of Optik, which implements the action 'append_const'.
def append_const_cb(const):
"Create callback to implement an append_const action via a callback."
def cb(option, opt_str, value, parser):
getattr(parser.values, option.dest).append(const)
return cb
for fname, ftype, fregexp in (('C++', 'cpp', '.*\.(h(pp)?|c(pp|\+\+|c)?)$'),
('Python', 'py', '.*\.py$')):
group.add_option('--%s' % ftype, '--select-%s' % ftype, dest='select',
action='callback', callback=append_const_cb(re.compile(fregexp)),
default=[],
help=("Adds a regular expression for selecting %s files to "
"match against.") % fname)
group.add_option('--select-grep', action='store',
metavar='REGEXP',
help="Further restrict the files to those which match "
"the given regular expression.")
group.add_option('--ignore-grep', action='store',
metavar='REGEXP',
help="Do not select files to those which match "
"the given regular expression.")
group.add_option('-f', '--select-from-file', action='store',
metavar='FILE',
help="Do not recurse through directories to find files "
"but instead read the list of filenames from the "
"given file.")
group.add_option('-r', '--root', action='append', dest='roots',
default=[], metavar='ROOT',
help="Specify a root to perform the search from "
"(default is CWD). You can use this option many times"
"for multiple roots.")
# This is a convenient option rather than making a test script, because we
# don't pollute the bin directory with a script that does not do much, and
# the option is available in all the scripts that use the select files
# proces.
group.add_option('-T', '-@', '--select-debug', action='store_true',
help="Only list the files and exit. This is used to "
"debug and test out which files will match your "
"replacement process when you run it.")
group.add_option('-N', '--select-no-defaults', action='store_true',
help="Do not setup default ignores (i.e. by default, "
"appropriate ignore patterns are set for Subversion "
"and CVS directories, etc.)")
parser.add_option_group(group)
return group
ignore_defaults = ('CVS', '\.(svn|git|hg|bzr)$')
def options_validate(opts, parser, logs=None):
"""
Validate and prepare the parsed options for the file selection option group.
This method returns an appropriate generator for selecting files.
"""
# Process file selection options
if opts.select_from_file:
if opts.select or opts.ignore:
parser.error("You cannot use select-from-file and other "
"select options together.")
if opts.roots:
parser.error("You cannot use select-from-file and specify "
"a list of root directories to search for.")
# Note: eventually we might want to support chaining the generators
# instead.
else:
# If no root directory has been specified, use the CWD.
if not opts.roots:
opts.roots.append(os.getcwd())
else:
missing = filter(lambda x: not exists(x), opts.roots)
if missing:
parser.error("Some root directories do not exist: %s" %
' '.join(missing))
# By default ignore some common directories.
if not opts.select_no_defaults:
opts.ignore = map(re.compile, ignore_defaults) + opts.ignore
# Process all files if no filter specified
if not opts.select:
opts.select.append(re.compile('.*'))
# Compile the regular expressions if given.
for regname in 'select_grep', 'ignore_grep':
regstr = getattr(opts, regname)
if regstr:
try:
setattr(opts, regname, re.compile(regstr))
except re.error, e:
parser.error("Error compiling regexp '%s':\n%s" % (regstr, e))
# Create an appropriate generator for the "select" method
if opts.select_from_file:
selector = select_from_file(opts.select_from_file)
else:
selector = select_patterns(opts.roots, opts)
# If we're asked to print the list of files, exhaust the generator and print
# the filenames and exit.
if opts.select_debug:
for fn in selector:
print fn
sys.exit(0)
return selector
def select_patterns(rootdirs, opts):
"""
Generator that selects files to process by regexps.
Arguments:
- rootdirs: root directories -> list of strings
- select: patterns to select -> list of re regexp objects
- ignore: patterns to ignore -> list of re regexp objects
Yields: selected filenames -> string
"""
# Walk the tree of files and select files as requested
for root in rootdirs:
for dn, dirs, files in os.walk(root):
# Filter directories.
for d in list(dirs):
add = True
# Only ignore applies to directories.
for ire in opts.ignore:
if ire.match(d):
add = False
break
if not add:
dirs.remove(d)
# Filter files.
for fn in files:
# Skip symlinks and special files.
if not isfile(join(dn, fn)):
continue
add = False
# Select.
for sre in opts.select:
if sre.match(fn):
add = True
break
# Further restrict by grepping the file for a pattern.
if add and opts.select_grep:
try:
text = open(join(dn, fn), 'r').read()
except IOError, e:
raise SystemExit(
"Error: could not read file '%s' for grep." % fn)
if not opts.select_grep.search(text):
add = False
# Ignore files.
for ire in opts.ignore:
if ire.match(fn):
add = False
break
# Further ignore by grepping the file for a pattern.
if add and opts.ignore_grep:
try:
text = open(join(dn, fn), 'r').read()
except IOError, e:
raise SystemExit(
"Error: could not read file for ignore '%s'." % fn)
if opts.ignore_grep.search(text):
add = False
if add:
yield join(dn, fn)
def select_from_file(fn):
"""
Generator that yields selected filenames read from a file.
Arguments:
- fn: filename of the file that contains the list of filenames -> string
Yields: selected filenames -> string
"""
try:
for fn in open(fn, 'r').xreadlines():
yield fn.strip()
except IOError, e:
raise SystemExit("Error: cannot open/read file (%s)" % e)
def test():
"""
Test stub for selection options.
"""
parser = optparse.OptionParser(__doc__.strip())
options_graft(parser)
opts, args = parser.parse_args()
selector = options_validate(opts, parser)
print 'from-file:', opts.select_from_file
print 'select:', map(lambda x: x.pattern, opts.select)
print 'ignore:', map(lambda x: x.pattern, opts.ignore)
print 'roots:', args
print
for fn in selector:
print fn
if __name__ == '__main__':
test()
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