scripts/release/io.py
author Sverre Rabbelier <srabbelier@gmail.com>
Mon, 07 Sep 2009 20:06:27 +0200
changeset 2867 e8d86272e6ea
parent 1981 8cfb054b73b2
permissions -rw-r--r--
Use system.getHostname() everywhere Replace os.environ['HTTP_HOST'] with system.getHostname(), as a result we do not crash when 'HTTP_HOST' is unset now.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
1981
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#!/usr/bin/python2.5
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#
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# Copyright 2009 the Melange authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#   http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import with_statement
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"""User prompting and file access utilities."""
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__authors__ = [
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    # alphabetical order by last name, please
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    '"David Anderson" <dave@natulte.net>',
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    ]
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import error
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import log
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class Error(error.Error):
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  pass
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class FileAccessError(Error):
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  """An error occured while accessing a file."""
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  pass
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def getString(prompt):
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  """Prompt for and return a string."""
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  prompt += ' '
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  log.stdout.write(prompt)
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  log.stdout.flush()
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  response = sys.stdin.readline()
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  log.terminal_echo(prompt + response.strip())
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  if not response:
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    raise error.AbortedByUser('Aborted by ctrl+D')
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  return response.strip()
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def confirm(prompt, default=False):
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  """Ask a yes/no question and return the answer.
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  Will reprompt the user until one of "yes", "no", "y" or "n" is
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  entered. The input is case insensitive.
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  Args:
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    prompt: The question to ask the user.
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    default: The answer to return if the user just hits enter.
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  Returns:
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    True if the user answered affirmatively, False otherwise.
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  """
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  if default:
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    question = prompt + ' [Yn]'
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  else:
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    question = prompt + ' [yN]'
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  while True:
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    answer = getString(question)
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    if not answer:
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      return default
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    elif answer in ('y', 'yes'):
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      return True
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    elif answer in ('n', 'no'):
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      return False
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    else:
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      log.error('Please answer yes or no.')
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def getNumber(prompt):
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  """Prompt for and return a number.
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  Will reprompt the user until a number is entered.
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  """
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  while True:
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    value_str = getString(prompt)
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    try:
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      return int(value_str)
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    except ValueError:
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      log.error('Please enter a number. You entered "%s".' % value_str)
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def getChoice(intro, prompt, choices, done=None, suggest=None):
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  """Prompt for and return a choice from a menu.
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  Will reprompt the user until a valid menu entry is chosen.
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  Args:
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    intro: Text to print verbatim before the choice menu.
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    prompt: The prompt to print right before accepting input.
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    choices: The list of string choices to display.
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    done: If not None, the list of indices of previously
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      selected/completed choices.
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    suggest: If not None, the index of the choice to highlight as
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      the suggested choice.
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  Returns:
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    The index in the choices list of the selection the user made.
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  """
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  done = set(done or [])
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  while True:
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    print intro
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    print
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    for i, entry in enumerate(choices):
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      done_text = ' (done)' if i in done else ''
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      indent = '--> ' if i == suggest else '    '
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      print '%s%2d. %s%s' % (indent, i+1, entry, done_text)
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    print
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    choice = getNumber(prompt)
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    if 0 < choice <= len(choices):
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      return choice-1
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    log.error('%d is not a valid choice between %d and %d' %
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              (choice, 1, len(choices)))
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    print
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def fileToLines(path):
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  """Read a file and return it as a list of lines."""
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  try:
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    with file(path) as f:
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      return f.read().split('\n')
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  except (IOError, OSError), e:
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    raise FileAccessError(str(e))
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def linesToFile(path, lines):
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  """Write a list of lines to a file."""
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  try:
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    with file(path, 'w') as f:
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      f.write('\n'.join(lines))
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  except (IOError, OSError), e:
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    raise FileAccessError(str(e))