check-code: catch Python 'is' comparing number or string literals
The Python 'is' operator compares object identity, so it should
definitely not be applied to string or number literals, which Python
implementations are free to represent with a temporary object.
This should catch the following kinds of bogus expressions (examples):
x is 'foo' x is not 'foo'
x is "bar" x is not "bar"
x is 42 x is not 42
x is -36 x is not -36
As originally proposed by Martin Geisler, amended with catching
negative numbers.
# ui.py - user interface bits for mercurial
#
# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from i18n import _
import errno, getpass, os, socket, sys, tempfile, traceback
import config, util, error
class ui(object):
def __init__(self, src=None):
self._buffers = []
self.quiet = self.verbose = self.debugflag = self.tracebackflag = False
self._reportuntrusted = True
self._ocfg = config.config() # overlay
self._tcfg = config.config() # trusted
self._ucfg = config.config() # untrusted
self._trustusers = set()
self._trustgroups = set()
if src:
self._tcfg = src._tcfg.copy()
self._ucfg = src._ucfg.copy()
self._ocfg = src._ocfg.copy()
self._trustusers = src._trustusers.copy()
self._trustgroups = src._trustgroups.copy()
self.environ = src.environ
self.fixconfig()
else:
# shared read-only environment
self.environ = os.environ
# we always trust global config files
for f in util.rcpath():
self.readconfig(f, trust=True)
def copy(self):
return self.__class__(self)
def _is_trusted(self, fp, f):
st = util.fstat(fp)
if util.isowner(st):
return True
tusers, tgroups = self._trustusers, self._trustgroups
if '*' in tusers or '*' in tgroups:
return True
user = util.username(st.st_uid)
group = util.groupname(st.st_gid)
if user in tusers or group in tgroups or user == util.username():
return True
if self._reportuntrusted:
self.warn(_('Not trusting file %s from untrusted '
'user %s, group %s\n') % (f, user, group))
return False
def readconfig(self, filename, root=None, trust=False,
sections=None, remap=None):
try:
fp = open(filename)
except IOError:
if not sections: # ignore unless we were looking for something
return
raise
cfg = config.config()
trusted = sections or trust or self._is_trusted(fp, filename)
try:
cfg.read(filename, fp, sections=sections, remap=remap)
except error.ConfigError, inst:
if trusted:
raise
self.warn(_("Ignored: %s\n") % str(inst))
if self.plain():
for k in ('debug', 'fallbackencoding', 'quiet', 'slash',
'logtemplate', 'style',
'traceback', 'verbose'):
if k in cfg['ui']:
del cfg['ui'][k]
for k, v in cfg.items('alias'):
del cfg['alias'][k]
for k, v in cfg.items('defaults'):
del cfg['defaults'][k]
if trusted:
self._tcfg.update(cfg)
self._tcfg.update(self._ocfg)
self._ucfg.update(cfg)
self._ucfg.update(self._ocfg)
if root is None:
root = os.path.expanduser('~')
self.fixconfig(root=root)
def fixconfig(self, root=None, section=None):
if section in (None, 'paths'):
# expand vars and ~
# translate paths relative to root (or home) into absolute paths
root = root or os.getcwd()
for c in self._tcfg, self._ucfg, self._ocfg:
for n, p in c.items('paths'):
if not p:
continue
if '%%' in p:
self.warn(_("(deprecated '%%' in path %s=%s from %s)\n")
% (n, p, self.configsource('paths', n)))
p = p.replace('%%', '%')
p = util.expandpath(p)
if '://' not in p and not os.path.isabs(p):
p = os.path.normpath(os.path.join(root, p))
c.set("paths", n, p)
if section in (None, 'ui'):
# update ui options
self.debugflag = self.configbool('ui', 'debug')
self.verbose = self.debugflag or self.configbool('ui', 'verbose')
self.quiet = not self.debugflag and self.configbool('ui', 'quiet')
if self.verbose and self.quiet:
self.quiet = self.verbose = False
self._reportuntrusted = self.configbool("ui", "report_untrusted",
True)
self.tracebackflag = self.configbool('ui', 'traceback', False)
if section in (None, 'trusted'):
# update trust information
self._trustusers.update(self.configlist('trusted', 'users'))
self._trustgroups.update(self.configlist('trusted', 'groups'))
def setconfig(self, section, name, value, overlay=True):
if overlay:
self._ocfg.set(section, name, value)
self._tcfg.set(section, name, value)
self._ucfg.set(section, name, value)
self.fixconfig(section=section)
def _data(self, untrusted):
return untrusted and self._ucfg or self._tcfg
def configsource(self, section, name, untrusted=False):
return self._data(untrusted).source(section, name) or 'none'
def config(self, section, name, default=None, untrusted=False):
value = self._data(untrusted).get(section, name, default)
if self.debugflag and not untrusted and self._reportuntrusted:
uvalue = self._ucfg.get(section, name)
if uvalue is not None and uvalue != value:
self.debug(_("ignoring untrusted configuration option "
"%s.%s = %s\n") % (section, name, uvalue))
return value
def configbool(self, section, name, default=False, untrusted=False):
v = self.config(section, name, None, untrusted)
if v is None:
return default
if isinstance(v, bool):
return v
b = util.parsebool(v)
if b is None:
raise error.ConfigError(_("%s.%s not a boolean ('%s')")
% (section, name, v))
return b
def configlist(self, section, name, default=None, untrusted=False):
"""Return a list of comma/space separated strings"""
def _parse_plain(parts, s, offset):
whitespace = False
while offset < len(s) and (s[offset].isspace() or s[offset] == ','):
whitespace = True
offset += 1
if offset >= len(s):
return None, parts, offset
if whitespace:
parts.append('')
if s[offset] == '"' and not parts[-1]:
return _parse_quote, parts, offset + 1
elif s[offset] == '"' and parts[-1][-1] == '\\':
parts[-1] = parts[-1][:-1] + s[offset]
return _parse_plain, parts, offset + 1
parts[-1] += s[offset]
return _parse_plain, parts, offset + 1
def _parse_quote(parts, s, offset):
if offset < len(s) and s[offset] == '"': # ""
parts.append('')
offset += 1
while offset < len(s) and (s[offset].isspace() or
s[offset] == ','):
offset += 1
return _parse_plain, parts, offset
while offset < len(s) and s[offset] != '"':
if (s[offset] == '\\' and offset + 1 < len(s)
and s[offset + 1] == '"'):
offset += 1
parts[-1] += '"'
else:
parts[-1] += s[offset]
offset += 1
if offset >= len(s):
real_parts = _configlist(parts[-1])
if not real_parts:
parts[-1] = '"'
else:
real_parts[0] = '"' + real_parts[0]
parts = parts[:-1]
parts.extend(real_parts)
return None, parts, offset
offset += 1
while offset < len(s) and s[offset] in [' ', ',']:
offset += 1
if offset < len(s):
if offset + 1 == len(s) and s[offset] == '"':
parts[-1] += '"'
offset += 1
else:
parts.append('')
else:
return None, parts, offset
return _parse_plain, parts, offset
def _configlist(s):
s = s.rstrip(' ,')
if not s:
return []
parser, parts, offset = _parse_plain, [''], 0
while parser:
parser, parts, offset = parser(parts, s, offset)
return parts
result = self.config(section, name, untrusted=untrusted)
if result is None:
result = default or []
if isinstance(result, basestring):
result = _configlist(result.lstrip(' ,\n'))
if result is None:
result = default or []
return result
def has_section(self, section, untrusted=False):
'''tell whether section exists in config.'''
return section in self._data(untrusted)
def configitems(self, section, untrusted=False):
items = self._data(untrusted).items(section)
if self.debugflag and not untrusted and self._reportuntrusted:
for k, v in self._ucfg.items(section):
if self._tcfg.get(section, k) != v:
self.debug(_("ignoring untrusted configuration option "
"%s.%s = %s\n") % (section, k, v))
return items
def walkconfig(self, untrusted=False):
cfg = self._data(untrusted)
for section in cfg.sections():
for name, value in self.configitems(section, untrusted):
yield section, name, str(value).replace('\n', '\\n')
def plain(self):
'''is plain mode active?
Plain mode means that all configuration variables which affect the
behavior and output of Mercurial should be ignored. Additionally, the
output should be stable, reproducible and suitable for use in scripts or
applications.
The only way to trigger plain mode is by setting the `HGPLAIN'
environment variable.
'''
return 'HGPLAIN' in os.environ
def username(self):
"""Return default username to be used in commits.
Searched in this order: $HGUSER, [ui] section of hgrcs, $EMAIL
and stop searching if one of these is set.
If not found and ui.askusername is True, ask the user, else use
($LOGNAME or $USER or $LNAME or $USERNAME) + "@full.hostname".
"""
user = os.environ.get("HGUSER")
if user is None:
user = self.config("ui", "username")
if user is not None:
user = os.path.expandvars(user)
if user is None:
user = os.environ.get("EMAIL")
if user is None and self.configbool("ui", "askusername"):
user = self.prompt(_("enter a commit username:"), default=None)
if user is None and not self.interactive():
try:
user = '%s@%s' % (util.getuser(), socket.getfqdn())
self.warn(_("No username found, using '%s' instead\n") % user)
except KeyError:
pass
if not user:
raise util.Abort(_('no username supplied (see "hg help config")'))
if "\n" in user:
raise util.Abort(_("username %s contains a newline\n") % repr(user))
return user
def shortuser(self, user):
"""Return a short representation of a user name or email address."""
if not self.verbose:
user = util.shortuser(user)
return user
def expandpath(self, loc, default=None):
"""Return repository location relative to cwd or from [paths]"""
if "://" in loc or os.path.isdir(os.path.join(loc, '.hg')):
return loc
path = self.config('paths', loc)
if not path and default is not None:
path = self.config('paths', default)
return path or loc
def pushbuffer(self):
self._buffers.append([])
def popbuffer(self, labeled=False):
'''pop the last buffer and return the buffered output
If labeled is True, any labels associated with buffered
output will be handled. By default, this has no effect
on the output returned, but extensions and GUI tools may
handle this argument and returned styled output. If output
is being buffered so it can be captured and parsed or
processed, labeled should not be set to True.
'''
return "".join(self._buffers.pop())
def write(self, *args, **opts):
'''write args to output
By default, this method simply writes to the buffer or stdout,
but extensions or GUI tools may override this method,
write_err(), popbuffer(), and label() to style output from
various parts of hg.
An optional keyword argument, "label", can be passed in.
This should be a string containing label names separated by
space. Label names take the form of "topic.type". For example,
ui.debug() issues a label of "ui.debug".
When labeling output for a specific command, a label of
"cmdname.type" is recommended. For example, status issues
a label of "status.modified" for modified files.
'''
if self._buffers:
self._buffers[-1].extend([str(a) for a in args])
else:
for a in args:
sys.stdout.write(str(a))
def write_err(self, *args, **opts):
try:
if not getattr(sys.stdout, 'closed', False):
sys.stdout.flush()
for a in args:
sys.stderr.write(str(a))
# stderr may be buffered under win32 when redirected to files,
# including stdout.
if not getattr(sys.stderr, 'closed', False):
sys.stderr.flush()
except IOError, inst:
if inst.errno not in (errno.EPIPE, errno.EIO):
raise
def flush(self):
try: sys.stdout.flush()
except: pass
try: sys.stderr.flush()
except: pass
def interactive(self):
'''is interactive input allowed?
An interactive session is a session where input can be reasonably read
from `sys.stdin'. If this function returns false, any attempt to read
from stdin should fail with an error, unless a sensible default has been
specified.
Interactiveness is triggered by the value of the `ui.interactive'
configuration variable or - if it is unset - when `sys.stdin' points
to a terminal device.
This function refers to input only; for output, see `ui.formatted()'.
'''
i = self.configbool("ui", "interactive", None)
if i is None:
try:
return sys.stdin.isatty()
except AttributeError:
# some environments replace stdin without implementing isatty
# usually those are non-interactive
return False
return i
def termwidth(self):
'''how wide is the terminal in columns?
'''
if 'COLUMNS' in os.environ:
try:
return int(os.environ['COLUMNS'])
except ValueError:
pass
return util.termwidth()
def formatted(self):
'''should formatted output be used?
It is often desirable to format the output to suite the output medium.
Examples of this are truncating long lines or colorizing messages.
However, this is not often not desirable when piping output into other
utilities, e.g. `grep'.
Formatted output is triggered by the value of the `ui.formatted'
configuration variable or - if it is unset - when `sys.stdout' points
to a terminal device. Please note that `ui.formatted' should be
considered an implementation detail; it is not intended for use outside
Mercurial or its extensions.
This function refers to output only; for input, see `ui.interactive()'.
This function always returns false when in plain mode, see `ui.plain()'.
'''
if self.plain():
return False
i = self.configbool("ui", "formatted", None)
if i is None:
try:
return sys.stdout.isatty()
except AttributeError:
# some environments replace stdout without implementing isatty
# usually those are non-interactive
return False
return i
def _readline(self, prompt=''):
if sys.stdin.isatty():
try:
# magically add command line editing support, where
# available
import readline
# force demandimport to really load the module
readline.read_history_file
# windows sometimes raises something other than ImportError
except Exception:
pass
line = raw_input(prompt)
# When stdin is in binary mode on Windows, it can cause
# raw_input() to emit an extra trailing carriage return
if os.linesep == '\r\n' and line and line[-1] == '\r':
line = line[:-1]
return line
def prompt(self, msg, default="y"):
"""Prompt user with msg, read response.
If ui is not interactive, the default is returned.
"""
if not self.interactive():
self.write(msg, ' ', default, "\n")
return default
try:
r = self._readline(msg + ' ')
if not r:
return default
return r
except EOFError:
raise util.Abort(_('response expected'))
def promptchoice(self, msg, choices, default=0):
"""Prompt user with msg, read response, and ensure it matches
one of the provided choices. The index of the choice is returned.
choices is a sequence of acceptable responses with the format:
('&None', 'E&xec', 'Sym&link') Responses are case insensitive.
If ui is not interactive, the default is returned.
"""
resps = [s[s.index('&')+1].lower() for s in choices]
while True:
r = self.prompt(msg, resps[default])
if r.lower() in resps:
return resps.index(r.lower())
self.write(_("unrecognized response\n"))
def getpass(self, prompt=None, default=None):
if not self.interactive():
return default
try:
return getpass.getpass(prompt or _('password: '))
except EOFError:
raise util.Abort(_('response expected'))
def status(self, *msg, **opts):
'''write status message to output (if ui.quiet is False)
This adds an output label of "ui.status".
'''
if not self.quiet:
opts['label'] = opts.get('label', '') + ' ui.status'
self.write(*msg, **opts)
def warn(self, *msg, **opts):
'''write warning message to output (stderr)
This adds an output label of "ui.warning".
'''
opts['label'] = opts.get('label', '') + ' ui.warning'
self.write_err(*msg, **opts)
def note(self, *msg, **opts):
'''write note to output (if ui.verbose is True)
This adds an output label of "ui.note".
'''
if self.verbose:
opts['label'] = opts.get('label', '') + ' ui.note'
self.write(*msg, **opts)
def debug(self, *msg, **opts):
'''write debug message to output (if ui.debugflag is True)
This adds an output label of "ui.debug".
'''
if self.debugflag:
opts['label'] = opts.get('label', '') + ' ui.debug'
self.write(*msg, **opts)
def edit(self, text, user):
(fd, name) = tempfile.mkstemp(prefix="hg-editor-", suffix=".txt",
text=True)
try:
f = os.fdopen(fd, "w")
f.write(text)
f.close()
editor = self.geteditor()
util.system("%s \"%s\"" % (editor, name),
environ={'HGUSER': user},
onerr=util.Abort, errprefix=_("edit failed"))
f = open(name)
t = f.read()
f.close()
finally:
os.unlink(name)
return t
def traceback(self, exc=None):
'''print exception traceback if traceback printing enabled.
only to call in exception handler. returns true if traceback
printed.'''
if self.tracebackflag:
if exc:
traceback.print_exception(exc[0], exc[1], exc[2])
else:
traceback.print_exc()
return self.tracebackflag
def geteditor(self):
'''return editor to use'''
return (os.environ.get("HGEDITOR") or
self.config("ui", "editor") or
os.environ.get("VISUAL") or
os.environ.get("EDITOR", "vi"))
def progress(self, topic, pos, item="", unit="", total=None):
'''show a progress message
With stock hg, this is simply a debug message that is hidden
by default, but with extensions or GUI tools it may be
visible. 'topic' is the current operation, 'item' is a
non-numeric marker of the current position (ie the currently
in-process file), 'pos' is the current numeric position (ie
revision, bytes, etc.), unit is a corresponding unit label,
and total is the highest expected pos.
Multiple nested topics may be active at a time.
All topics should be marked closed by setting pos to None at
termination.
'''
if pos == None or not self.debugflag:
return
if unit:
unit = ' ' + unit
if item:
item = ' ' + item
if total:
pct = 100.0 * pos / total
self.debug('%s:%s %s/%s%s (%4.2f%%)\n'
% (topic, item, pos, total, unit, pct))
else:
self.debug('%s:%s %s%s\n' % (topic, item, pos, unit))
def log(self, service, message):
'''hook for logging facility extensions
service should be a readily-identifiable subsystem, which will
allow filtering.
message should be a newline-terminated string to log.
'''
pass
def label(self, msg, label):
'''style msg based on supplied label
Like ui.write(), this just returns msg unchanged, but extensions
and GUI tools can override it to allow styling output without
writing it.
ui.write(s, 'label') is equivalent to
ui.write(ui.label(s, 'label')).
'''
return msg