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# Copyright (C) 2011 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Console output routines.
$Repo: git://git.sugarlabs.org/alsroot/codelets.git$
$File: src/printf.py$
$Date: 2012-10-22$
"""
import sys
import logging
#: Disable/enable non-status output.
VERBOSE = True
#: Disable/enable any output.
QUIET = False
RESET = '\033[0m'
BOLD = '\033[1m'
BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = \
['\033[1;%dm' % (30 + i_) for i_ in range(8)]
stdout = sys.stdout
stderr = sys.stderr
_hints = []
_last_line_len = 0
_last_progress = []
_screen_width = None
def dump(message, *args):
"""Print verbatim text.
:param message:
text to print
:param \*args:
`%` arguments to expand `message` value
"""
_dump(False, stdout, '', [message, args], '\n')
def info(message, *args):
"""Print information text.
:param message:
text to print
:param \*args:
`%` arguments to expand `message` value
"""
_dump(True, stderr, None, [message, args], '\n')
_dump_progress()
def exception(message=None, *args):
"""Print exception text.
Call this function in `try..except` block after getting exceptions.
:param message:
text to print
:param \*args:
`%` arguments to expand `message` value
"""
import traceback
klass, error, tb = sys.exc_info()
tb_list = []
for line in traceback.format_exception(klass, error, tb):
tb_list.extend([i.rstrip() for i in line.strip().split('\n')])
if type(error).__name__ == 'dbus.exceptions.DBusException':
dbus_tb = str(error).split('\n')
if len(dbus_tb) == 1:
error = dbus_tb[0]
else:
# Strip the last empty line
del dbus_tb[-1]
error = '%s:%s' % \
(dbus_tb[0].split(':')[0], dbus_tb[-1].split(':', 1)[-1])
if message and args:
message = message % args
error = str(error) or 'Something weird happened'
if message:
message += ': %s' % error
else:
message = str(error)
_dump(True, stderr, None, message, '\n')
if logging.getLogger().level > logging.INFO:
hint('Use -D argument for debug info, '
'-DD for full debuging output and tracebacks')
elif logging.getLogger().level > logging.DEBUG:
hint('Use -DD argument for full debuging output and tracebacks')
else:
for i in tb_list:
_dump(True, stderr, ' ', i, '\n')
_dump_progress()
def scan_yn(message, *args):
"""Request for Y/N input.
:param message:
prefix text to print
:param \*args:
`%` arguments to expand `message` value
:returns:
`True` if user's input was `Y`
"""
_dump(True, stderr, None, [message, args], ' [Y/N] ')
answer = raw_input()
_dump_progress()
return answer and answer in 'Yy'
def progress(message, *args):
"""Print status line text.
Status line will be shown as the last line all time and will be cleared
on program exit.
:param message:
prefix text to print
:param \*args:
`%` arguments to expand `message` value
"""
_last_progress[:] = [message, args]
_dump_progress()
def clear_progress():
"""Clear status line on program exit."""
if _last_line_len:
stderr.write(chr(13) + ' ' * _last_line_len + chr(13))
def hint(message, *args):
"""Add new hint.
All hint will be queued to print them at once in `flush_hints()` function
on program exit.
:param message:
prefix text to print
:param \*args:
`%` arguments to expand `message` value
"""
if args:
message = message % args
_hints.append(message)
def flush_hints():
"""Print all queued hints."""
clear_progress()
if _hints:
dump('')
while _hints:
_dump(True, stderr, '-- Hint: ', _hints.pop(0), '\n')
def _dump(is_status, stream, prefix, *args):
if not VERBOSE or QUIET:
return
global _last_line_len
global _screen_width
if _screen_width is None:
try:
import curses
curses.setupterm()
_screen_width = curses.tigetnum('cols') or 80
except Exception, error:
logging.info('Cannot get screen width: %s', error)
_screen_width = 80
if prefix is None:
prefix = '-- '
clear_progress()
_last_line_len = 0
for i in [prefix] + list(args):
if isinstance(i, list):
if i:
message, message_args = i
if message_args:
message = message % message_args
else:
message = i
stream.write(message)
if is_status:
_last_line_len += len(message)
_last_line_len = min(_last_line_len, _screen_width)
def _dump_progress():
_dump(True, stderr, ' ', _last_progress, chr(13))
stderr.flush()
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