Synnefo » ./kamaki

# Copyright 2011 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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# or implied, of GRNET S.A.

from sys import stdout, stdin

from re import compile as regex_compile

from kamaki.cli.errors import raiseCLIError

try:

    from colors import magenta, red, yellow, bold

except ImportError:

    # No colours? No worries, use dummy foo instead

    def dummy(val):

        return val

    red = yellow = magenta = bold = dummy

def remove_colors():

    global bold

    global red

    global yellow

    global magenta

    def dummy(val):

        return val

    red = yellow = magenta = bold = dummy

def pretty_keys(d, delim='_', recurcive=False):

    """<term>delim<term> to <term> <term> transformation

    """

    new_d = {}

    for key, val in d.items():

        new_key = key.split(delim)[-1]

        if recurcive and isinstance(val, dict):

            new_val = pretty_keys(val, delim, recurcive)

        else:

            new_val = val

        new_d[new_key] = new_val

    return new_d

def print_dict(d,

    exclude=(),

    ident=0,

    with_enumeration=False,

    recursive_enumeration=False):

    """

    Pretty-print a dictionary object

    :param d: (dict) the input

    :param excelude: (set or list) keys to exclude from printing

    :param ident: (int) initial indentation (recursive)

    :param with_enumeration: (bool) enumerate each 1st level key if true

    :recursive_enumeration: (bool) recursively enumerate dicts and lists of

        2nd level or deeper

    :raises CLIError: (TypeError wrapper) non-dict input

    """

    if not isinstance(d, dict):

        raiseCLIError(TypeError('Cannot dict_print a non-dict object'))

    if d:

        margin = max(len(unicode(key).strip())\

            for key in d.keys() if key not in exclude)

    counter = 1

    for key, val in sorted(d.items()):

        if key in exclude:

            continue

        print_str = ''

        if with_enumeration:

            print_str = '%s. ' % counter

            counter += 1

        print_str = '%s%s' % (' ' * (ident - len(print_str)), print_str)

        print_str += ('%s' % key).strip()

        print_str += ' ' * (margin - len(unicode(key).strip()))

        print_str += ': '

        if isinstance(val, dict):

            print(print_str)

            print_dict(val,

                exclude=exclude,

                ident=margin + ident,

                with_enumeration=recursive_enumeration,

                recursive_enumeration=recursive_enumeration)

        elif isinstance(val, list):

            print(print_str)

            print_list(val,

                exclude=exclude,

                ident=margin + ident,

                with_enumeration=recursive_enumeration,

                recursive_enumeration=recursive_enumeration)

        else:

            print print_str + ' ' + unicode(val).strip()

def print_list(l,

    exclude=(),

    ident=0,

    with_enumeration=False,

    recursive_enumeration=False):

    """

    Pretty-print a list object

    :param l: (list) the input

    :param excelude: (object - anytype) values to exclude from printing

    :param ident: (int) initial indentation (recursive)

    :param with_enumeration: (bool) enumerate each 1st level value if true

    :recursive_enumeration: (bool) recursively enumerate dicts and lists of

        2nd level or deeper

    :raises CLIError: (TypeError wrapper) non-list input

    """

    if not isinstance(l, list):

        raiseCLIError(TypeError('Cannot list_print a non-list object'))

    if l:

        try:

            margin = max(len(unicode(item).strip()) for item in l\

                if not (isinstance(item, dict)\

                or isinstance(item, list)\

                or item in exclude))

        except ValueError:

            margin = (2 + len(unicode(len(l)))) if enumerate else 1

    counter = 1

    prefix = ''

    for item in sorted(l):

        if item in exclude:

            continue

        elif with_enumeration:

            prefix = '%s. ' % counter

            counter += 1

            prefix = '%s%s' % (' ' * (ident - len(prefix)), prefix)

        else:

            prefix = ' ' * ident

        if isinstance(item, dict):

            if with_enumeration:

                print(prefix)

            print_dict(item,

                exclude=exclude,

                ident=margin + ident,

                with_enumeration=recursive_enumeration,

                recursive_enumeration=recursive_enumeration)

        elif isinstance(item, list):

            if with_enumeration:

                print(prefix)

            print_list(item,

                exclude=exclude,

                ident=margin + ident,

                with_enumeration=recursive_enumeration,

                recursive_enumeration=recursive_enumeration)

        else:

            print('%s%s' % (prefix, item))

def page_hold(index, limit, maxlen):

    """Check if there are results to show, and hold the page when needed

    :param index: (int) > 0

    :param limit: (int) 0 < limit <= max, page hold if limit mod index == 0

    :param maxlen: (int) Don't hold if index reaches maxlen

    :returns: True if there are more to show, False if all results are shown

    """

    if index >= limit and index % limit == 0:

        if index >= maxlen:

            return False

        else:

            print('(%s listed - %s more - "enter" to continue)' % (

                index,

                maxlen - index))

            c = ' '

            while c != '\n':

                c = stdin.read(1)

    return True

def print_items(items,

    title=('id', 'name'),

    with_enumeration=False,

    with_redundancy=False,

    page_size=0):

    """print dict or list items in a list, using some values as title

    Objects of next level don't inherit enumeration (default: off) or titles

    :param items: (list) items are lists or dict

    :param title: (tuple) keys to use their values as title

    :param with_enumeration: (boolean) enumerate items (order id on title)

    :param with_redundancy: (boolean) values in title also appear on body

    :param page_size: (int) show results in pages of page_size items, enter to

        continue

    """

    if not items:

        return

    try:

        page_size = int(page_size) if int(page_size) > 0 else len(items)

    except:

        page_size = len(items)

    num_of_pages = len(items) // page_size

    num_of_pages += 1 if len(items) % page_size else 0

    for i, item in enumerate(items):

        if with_enumeration:

            stdout.write('%s. ' % (i + 1))

        if isinstance(item, dict):

            title = sorted(set(title).intersection(item.keys()))

            if with_redundancy:

                header = ' '.join(unicode(item[key]) for key in title)

            else:

                header = ' '.join(unicode(item.pop(key)) for key in title)

            print(bold(header))

        else:

            print('- - -')

        if isinstance(item, dict):

            print_dict(item, ident=1)

        elif isinstance(item, list):

            print_list(item, ident=1)

        else:

            print(' %s' % item)

        page_hold(i + 1, page_size, len(items))

def format_size(size):

    units = ('B', 'K', 'M', 'G', 'T')

    try:

        size = float(size)

    except ValueError as err:

        raiseCLIError(err, 'Cannot format %s in bytes' % size)

    for unit in units:

        if size < 1024:

            break

        size /= 1024

    s = ('%.1f' % size)

    if '.0' == s[-2:]:

        s = s[:-2]

    return s + unit

def dict2file(d, f, depth=0):

    for k, v in d.items():

        f.write('%s%s: ' % ('\t' * depth, k))

        if isinstance(v, dict):

            f.write('\n')

            dict2file(v, f, depth + 1)

        elif isinstance(v, list):

            f.write('\n')

            list2file(v, f, depth + 1)

        else:

            f.write(' %s\n' % unicode(v))

def list2file(l, f, depth=1):

    for item in l:

        if isinstance(item, dict):

            dict2file(item, f, depth + 1)

        elif isinstance(item, list):

            list2file(item, f, depth + 1)

        else:

            f.write('%s%s\n' % ('\t' * depth, unicode(item)))

# Split input auxiliary

def _parse_with_regex(line, regex):

    re_parser = regex_compile(regex)

    return (re_parser.split(line), re_parser.findall(line))

def _sub_split(line):

    terms = []

    (sub_trivials, sub_interesting) = _parse_with_regex(line, ' ".*?" ')

    for subi, subipart in enumerate(sub_interesting):

        terms += sub_trivials[subi].split()

        terms.append(subipart[2:-2])

    terms += sub_trivials[-1].split()

    return terms

def split_input(line):

    """Use regular expressions to split a line correctly

    """

    line = ' %s ' % line

    (trivial_parts, interesting_parts) = _parse_with_regex(line, ' \'.*?\' ')

    terms = []

    for i, ipart in enumerate(interesting_parts):

        terms += _sub_split(trivial_parts[i])

        terms.append(ipart[2:-2])

    terms += _sub_split(trivial_parts[-1])

    return terms

def ask_user(msg, true_responses=('Y', 'y')):

    """Print msg and read user response

    :param true_responses: (tuple of chars)

    :returns: (bool) True if reponse in true responses, False otherwise

    """

    stdout.write('%s (%s for yes):' % (msg, true_responses))

    stdout.flush()

    user_response = stdin.read(1)

    return user_response[0] in true_responses