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"""functions that directly handle user input
"""
import sys
import time
from askbot.utils import path
def choice_dialog(prompt_phrase, choices = None, invalid_phrase = None):
"""prints a prompt, accepts keyboard input
and makes sure that user response is one of given
in the choices argument, which is required
and must be a list
invalid_phrase must be a string with %(opt_string)s
placeholder
"""
assert(hasattr(choices, '__iter__'))
assert(not isinstance(choices, basestring))
while 1:
response = raw_input('\n%s (type %s): ' % (prompt_phrase, '/'.join(choices)))
if response in choices:
return response
elif invalid_phrase != None:
opt_string = ','.join(choices)
print invalid_phrase % {'opt_string': opt_string}
time.sleep(1)
def open_new_file(prompt_phrase, extension = '', hint = None):
"""will ask for a file name to be typed
by user into the console path to the file can be
either relative or absolute. Extension will be appended
to the given file name.
Return value is the file object.
"""
if extension != '':
if extension[0] != '.':
extension = '.' + extension
else:
extension = ''
file_object = None
if hint:
file_path = path.extend_file_name(hint, extension)
file_object = path.create_file_if_does_not_exist(file_path, print_warning = True)
while file_object == None:
file_path = raw_input(prompt_phrase)
file_path = path.extend_file_name(file_path, extension)
file_object = path.create_file_if_does_not_exist(file_path, print_warning = True)
return file_object
def print_action(action_text, nowipe = False):
"""print the string to the standard output
then wipe it out to clear space
"""
#for some reason sys.stdout.write does not work here
#when action text is unicode
print action_text,
sys.stdout.flush()
if nowipe == False:
#return to the beginning of the word
sys.stdout.write('\b' * len(action_text))
#white out the printed text
sys.stdout.write(' ' * len(action_text))
#return again
sys.stdout.write('\b' * len(action_text))
else:
sys.stdout.write('\n')
def print_progress(elapsed, total, nowipe = False):
"""print dynamic output of progress of some
operation, in percent, to the console and clear the output with
a backspace character to have the number increment
in-place"""
output = '%6.2f%%' % (100 * float(elapsed)/float(total))
print_action(output, nowipe)
class ProgressBar(object):
"""A wrapper for an iterator, that prints
a progress bar along the way of iteration
"""
def __init__(self, iterable, length, message = ''):
self.iterable = iterable
self.length = length
self.counter = float(0)
self.barlen = 60
self.progress = ''
if message and length > 0:
print message
def __iter__(self):
return self
def next(self):
try:
result = self.iterable.next()
except StopIteration:
if self.length > 0:
sys.stdout.write('\n')
raise
sys.stdout.write('\b'*len(self.progress))
if self.length < self.barlen:
sys.stdout.write('-'*(self.barlen/self.length))
elif int(self.counter) % (self.length / self.barlen) == 0:
sys.stdout.write('-')
self.progress = ' %.2f%%' % (100 * (self.counter/self.length))
sys.stdout.write(self.progress)
sys.stdout.flush()
self.counter += 1
return result
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