Synnefo » ./kamaki

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from sys import stdout, stdin, stderr

from re import compile as regex_compile

from os import walk, path

from json import dumps

from kamaki.cli.logger import get_logger

from locale import getpreferredencoding

from kamaki.cli.errors import raiseCLIError

INDENT_TAB = 4

log = get_logger(__name__)

pref_enc = getpreferredencoding()

suggest = dict(ansicolors=dict(

        active=False,

        url='#install-ansicolors',

        description='Add colors to console responses'))

try:

    from colors import magenta, red, yellow, bold

except ImportError:

    def dummy(val):

        return val

    red = yellow = magenta = bold = dummy

    suggest['ansicolors']['active'] = True

def _encode_nicely(somestr, encoding, replacement='?'):

    """Encode somestr as 'encoding', but don't raise errors (replace with ?)

        This method is slow. Us it only for grace.

        :param encoding: (str) encode every character in this encoding

        :param replacement: (char) replace each char raising encode-decode errs

    """

    newstr, err_counter = '', 0

    for c in somestr:

        try:

            newc = c.encode(encoding)

            newstr = '%s%s' % (newstr, newc)

        except UnicodeError:

            newstr = '%s%s' % (newstr, replacement)

            err_counter += 1

    if err_counter:

        log.debug('\t%s character%s failed to be encoded as %s' % (

            err_counter, 's' if err_counter > 1 else '', encoding))

    return newstr

def DontRaiseUnicodeError(foo):

    def wrap(self, *args, **kwargs):

        try:

            s = kwargs.pop('s')

        except KeyError:

            try:

                s = args[0]

            except IndexError:

                return foo(self, *args, **kwargs)

            args = args[1:]

        try:

            s = s.encode(pref_enc)

        except UnicodeError as ue:

            log.debug('Encoding(%s): %s' % (pref_enc, ue))

            s = _encode_nicely(s, pref_enc, replacement='?')

        return foo(self, s, *args, **kwargs)

    return wrap

def encode_for_console(s, encoding=pref_enc, replacement='?'):

    if encoding.lower() == 'utf-8':

        return s

    try:

        return s.encode(encoding)

    except UnicodeError as ue:

        log.debug('Encoding(%s): %s' % (encoding, ue))

        return _encode_nicely(s, encoding, replacement)

def suggest_missing(miss=None, exclude=[]):

    global suggest

    sgs = dict(suggest)

    for exc in exclude:

        try:

            sgs.pop(exc)

        except KeyError:

            pass

    kamaki_docs = 'http://www.synnefo.org/docs/kamaki/latest'

    for k, v in (miss, sgs[miss]) if miss else sgs.items():

        if v['active'] and stderr.isatty():

            stderr.write('Suggestion: you may like to install %s\n' % k)

            stderr.write('\t%s\n' % encode_for_console(v['description']))

            stderr.write('\tIt is easy, here are the instructions:\n')

            stderr.write('\t%s/installation.html%s\n' % (

                kamaki_docs, v['url']))

            stderr.flush()

def guess_mime_type(

        filename,

        default_content_type='application/octet-stream',

        default_encoding=None):

    assert filename, 'Cannot guess mimetype for empty filename'

    try:

        from mimetypes import guess_type

        ctype, cenc = guess_type(filename)

        return ctype or default_content_type, cenc or default_encoding

    except ImportError:

        stderr.write('WARNING: Cannot import mimetypes, using defaults\n')

        stderr.flush()

        return (default_content_type, default_encoding)

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='_', recursive=False):

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

    new_d = dict(d)

    for k, v in d.items():

        new_v = new_d.pop(k)

        new_d[k.replace(delim, ' ').strip()] = pretty_keys(

            new_v, delim, True) if (

                recursive and isinstance(v, dict)) else new_v

    return new_d

def print_json(data, out=stdout, encoding=pref_enc):

    """Print a list or dict as json in console

    :param data: json-dumpable data

    :param out: Input/Output stream to dump values into

    """

    out.write(dumps(data, indent=INDENT_TAB))

    out.write('\n')

    out.flush()

def print_dict(

        d,

        exclude=(), indent=0,

        with_enumeration=False, recursive_enumeration=False, out=stdout):

    """Pretty-print a dictionary object

    <indent>key: <non iterable item>

    <indent>key:

    <indent + INDENT_TAB><pretty-print iterable>

    :param d: (dict)

    :param exclude: (iterable of strings) keys to exclude from printing

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

    :param with_enumeration: (bool) enumerate 1st-level keys

    :param recursive_enumeration: (bool) recursively enumerate iterables (does

        not enumerate 1st level keys)

    :param out: Input/Output stream to dump values into

    :raises CLIError: if preconditions fail

    """

    assert isinstance(d, dict), 'print_dict input must be a dict'

    assert indent >= 0, 'print_dict indent must be >= 0'

    for i, (k, v) in enumerate(d.items()):

        k = ('%s' % k).strip()

        if k in exclude:

            continue

        print_str = ' ' * indent

        print_str += '%s.' % (i + 1) if with_enumeration else ''

        print_str += '%s:' % k

        if isinstance(v, dict):

            out.write(print_str + '\n')

            print_dict(

                v, exclude, indent + INDENT_TAB,

                recursive_enumeration, recursive_enumeration, out)

        elif isinstance(v, list) or isinstance(v, tuple):

            out.write(print_str + '\n')

            print_list(

                v, exclude, indent + INDENT_TAB,

                recursive_enumeration, recursive_enumeration, out)

        else:

            out.write('%s %s\n' % (print_str, v))

        out.flush()

def print_list(

        l,

        exclude=(), indent=0,

        with_enumeration=False, recursive_enumeration=False, out=stdout):

    """Pretty-print a list of items

    <indent>key: <non iterable item>

    <indent>key:

    <indent + INDENT_TAB><pretty-print iterable>

    :param l: (list)

    :param exclude: (iterable of strings) items to exclude from printing

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

    :param with_enumeration: (bool) enumerate 1st-level items

    :param recursive_enumeration: (bool) recursively enumerate iterables (does

        not enumerate 1st level keys)

    :param out: Input/Output stream to dump values into

    :raises CLIError: if preconditions fail

    """

    assert isinstance(l, list) or isinstance(l, tuple), (

        'print_list prinbts a list or tuple')

    assert indent >= 0, 'print_list indent must be >= 0'

    for i, item in enumerate(l):

        print_str = ' ' * indent

        print_str += '%s.' % (i + 1) if with_enumeration else ''

        if isinstance(item, dict):

            if with_enumeration:

                out.write(print_str + '\n')

            elif i and i < len(l):

                out.write('\n')

            print_dict(

                item, exclude,

                indent + (INDENT_TAB if with_enumeration else 0),

                recursive_enumeration, recursive_enumeration, out)

        elif isinstance(item, list) or isinstance(item, tuple):

            if with_enumeration:

                out.write(print_str + '\n')

            elif i and i < len(l):

                out.write('\n')

            print_list(

                item, exclude, indent + INDENT_TAB,

                recursive_enumeration, recursive_enumeration, out)

        else:

            item = ('%s' % item).strip()

            if item in exclude:

                continue

            out.write('%s%s\n' % (print_str, item))

        out.flush()

    out.flush()

def print_items(

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

        with_enumeration=False, with_redundancy=False, out=stdout):

    """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 out: Input/Output stream to dump values into

    """

    if not items:

        return

    if not (isinstance(items, dict) or isinstance(items, list) or isinstance(

                items, tuple)):

        out.write('%s\n' % items)

        out.flush()

        return

    for i, item in enumerate(items):

        if with_enumeration:

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

        if isinstance(item, dict):

            item = dict(item)

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

            pick = item.get if with_redundancy else item.pop

            header = ' '.join('%s' % pick(key) for key in title)

            out.write((unicode(bold(header) if header else '') + '\n'))

            print_dict(item, indent=INDENT_TAB, out=out)

        elif isinstance(item, list) or isinstance(item, tuple):

            print_list(item, indent=INDENT_TAB, out=out)

        else:

            out.write(' %s\n' % item)

        out.flush()

    out.flush()

def format_size(size, decimal_factors=False):

    units = ('B', 'KB', 'MB', 'GB', 'TB') if decimal_factors else (

        'B', 'KiB', 'MiB', 'GiB', 'TiB')

    step = 1000 if decimal_factors else 1024

    fstep = float(step)

    try:

        size = float(size)

    except (ValueError, TypeError) as err:

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

            ','.join(size) if isinstance(size, tuple) else size))

    for i, unit in enumerate(units):

        if size < step or i + 1 == len(units):

            break

        size /= fstep

    s = ('%.2f' % size)

    s = s.replace('%s' % step, '%s.99' % (step - 1)) if size <= fstep else s

    while '.' in s and s[-1] in ('0', '.'):

        s = s[:-1]

    return s + unit

def to_bytes(size, format):

    """

    :param size: (float) the size in the given format

    :param format: (case insensitive) KiB, KB, MiB, MB, GiB, GB, TiB, TB

    :returns: (int) the size in bytes

    :raises ValueError: if invalid size or format

    :raises AttributeError: if format is not str

    :raises TypeError: if size is not arithmetic or convertible to arithmetic

    """

    format = format.upper()

    if format == 'B':

        return int(size)

    size = float(size)

    units_dc = ('KB', 'MB', 'GB', 'TB')

    units_bi = ('KIB', 'MIB', 'GIB', 'TIB')

    factor = 1024 if format in units_bi else 1000 if format in units_dc else 0

    if not factor:

        raise ValueError('Invalid data size format %s' % format)

    for prefix in ('K', 'M', 'G', 'T'):

        size *= factor

        if format.startswith(prefix):

            break

    return int(size)

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

    for k, v in d.items():

        f.write('%s%s: ' % (' ' * INDENT_TAB * depth, k))

        if isinstance(v, dict):

            f.write('\n')

            dict2file(v, f, depth + 1)

        elif isinstance(v, list) or isinstance(v, tuple):

            f.write('\n')

            list2file(v, f, depth + 1)

        else:

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

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

    for item in l:

        if isinstance(item, dict):

            dict2file(item, f, depth + 1)

        elif isinstance(item, list) or isinstance(item, tuple):

            list2file(item, f, depth + 1)

        else:

            f.write('%s%s\n' % (' ' * INDENT_TAB * depth, 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 _get_from_parsed(parsed_str):

    try:

        parsed_str = parsed_str.strip()

    except:

        return None

    return ([parsed_str[1:-1]] if (

        parsed_str[0] == parsed_str[-1] and parsed_str[0] in ("'", '"')) else (

            parsed_str.split(' '))) if parsed_str else None

def split_input(line):

    if not line:

        return []

    reg_expr = '\'.*?\'|".*?"|^[\S]*$'

    (trivial_parts, interesting_parts) = _parse_with_regex(line, reg_expr)

    assert(len(trivial_parts) == 1 + len(interesting_parts))

    terms = []

    for i, tpart in enumerate(trivial_parts):

        part = _get_from_parsed(tpart)

        if part:

            terms += part

        try:

            part = _get_from_parsed(interesting_parts[i])

        except IndexError:

            break

        if part:

            if tpart and not tpart[-1].endswith(' '):

                terms[-1] += ' '.join(part)

            else:

                terms += part

    return terms

def ask_user(msg, true_resp=('y', ), out=stdout, user_in=stdin):

    """Print msg and read user response

    :param true_resp: (tuple of chars)

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

    """

    yep = ', '.join(true_resp)

    nope = '<not %s>' % yep if 'n' in true_resp or 'N' in true_resp else 'N'

    out.write('%s [%s/%s]: ' % (msg, yep, nope))

    out.flush()

    user_response = user_in.readline()

    return user_response[0].lower() in [s.lower() for s in true_resp]

def get_path_size(testpath):

    if path.isfile(testpath):

        return path.getsize(testpath)

    total_size = 0

    for top, dirs, files in walk(path.abspath(testpath)):

        for f in files:

            f = path.join(top, f)

            if path.isfile(f):

                total_size += path.getsize(f)

    return total_size

def remove_from_items(list_of_dicts, key_to_remove):

    for item in list_of_dicts:

        assert isinstance(item, dict), 'Item %s not a dict' % item

        item.pop(key_to_remove, None)

def filter_dicts_by_dict(

    list_of_dicts, filters,

    exact_match=True, case_sensitive=False):

    """

    :param list_of_dicts: (list) each dict contains "raw" key-value pairs

    :param filters: (dict) filters in key-value form

    :param exact_match: (bool) if false, check if the filter value is part of

        the actual value

    :param case_sensitive: (bool) refers to values only (not keys)

    :returns: (list) only the dicts that match all filters

    """

    new_dicts = []

    for d in list_of_dicts:

        if set(filters).difference(d):

            continue

        match = True

        for k, v in filters.items():

            dv, v = ('%s' % d[k]), ('%s' % v)

            if not case_sensitive:

                dv, v = dv.lower(), v.lower()

            if not ((

                    exact_match and v == dv) or (

                    (not exact_match) and v in dv)):

                match = False

                break

        if match:

            new_dicts.append(d)

    return new_dicts