rhodecode/lib/helpers.py

# -*- coding: utf-8 -*-

# Copyright (C) 2010-2016  RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

"""
Helper functions

Consists of functions to typically be used within templates, but also
available to Controllers. This module is available to both as 'h'.
"""

import random
import hashlib
import StringIO
import urllib
import math
import logging
import re
import urlparse
import time
import string
import hashlib
import pygments

from datetime import datetime
from functools import partial
from pygments.formatters.html import HtmlFormatter
from pygments import highlight as code_highlight
from pygments.lexers import (
    get_lexer_by_name, get_lexer_for_filename, get_lexer_for_mimetype)
from pylons import url
from pylons.i18n.translation import _, ungettext
from pyramid.threadlocal import get_current_request

from webhelpers.html import literal, HTML, escape
from webhelpers.html.tools import *
from webhelpers.html.builder import make_tag
from webhelpers.html.tags import auto_discovery_link, checkbox, css_classes, \
    end_form, file, form as wh_form, hidden, image, javascript_link, link_to, \
    link_to_if, link_to_unless, ol, required_legend, select, stylesheet_link, \
    submit, text, password, textarea, title, ul, xml_declaration, radio
from webhelpers.html.tools import auto_link, button_to, highlight, \
    js_obfuscate, mail_to, strip_links, strip_tags, tag_re
from webhelpers.pylonslib import Flash as _Flash
from webhelpers.text import chop_at, collapse, convert_accented_entities, \
    convert_misc_entities, lchop, plural, rchop, remove_formatting, \
    replace_whitespace, urlify, truncate, wrap_paragraphs
from webhelpers.date import time_ago_in_words
from webhelpers.paginate import Page as _Page
from webhelpers.html.tags import _set_input_attrs, _set_id_attr, \
    convert_boolean_attrs, NotGiven, _make_safe_id_component
from webhelpers2.number import format_byte_size

from rhodecode.lib.annotate import annotate_highlight
from rhodecode.lib.action_parser import action_parser
from rhodecode.lib.utils import repo_name_slug, get_custom_lexer
from rhodecode.lib.utils2 import str2bool, safe_unicode, safe_str, \
    get_commit_safe, datetime_to_time, time_to_datetime, time_to_utcdatetime, \
    AttributeDict, safe_int, md5, md5_safe
from rhodecode.lib.markup_renderer import MarkupRenderer
from rhodecode.lib.vcs.exceptions import CommitDoesNotExistError
from rhodecode.lib.vcs.backends.base import BaseChangeset, EmptyCommit
from rhodecode.config.conf import DATE_FORMAT, DATETIME_FORMAT
from rhodecode.model.changeset_status import ChangesetStatusModel
from rhodecode.model.db import Permission, User, Repository
from rhodecode.model.repo_group import RepoGroupModel
from rhodecode.model.settings import IssueTrackerSettingsModel

log = logging.getLogger(__name__)

DEFAULT_USER = User.DEFAULT_USER
DEFAULT_USER_EMAIL = User.DEFAULT_USER_EMAIL


def html_escape(text, html_escape_table=None):
    """Produce entities within text."""
    if not html_escape_table:
        html_escape_table = {
            "&": "&amp;",
            '"': "&quot;",
            "'": "&apos;",
            ">": "&gt;",
            "<": "&lt;",
        }
    return "".join(html_escape_table.get(c, c) for c in text)


def chop_at_smart(s, sub, inclusive=False, suffix_if_chopped=None):
    """
    Truncate string ``s`` at the first occurrence of ``sub``.

    If ``inclusive`` is true, truncate just after ``sub`` rather than at it.
    """
    suffix_if_chopped = suffix_if_chopped or ''
    pos = s.find(sub)
    if pos == -1:
        return s

    if inclusive:
        pos += len(sub)

    chopped = s[:pos]
    left = s[pos:].strip()

    if left and suffix_if_chopped:
        chopped += suffix_if_chopped

    return chopped


def shorter(text, size=20):
    postfix = '...'
    if len(text) > size:
        return text[:size - len(postfix)] + postfix
    return text


def _reset(name, value=None, id=NotGiven, type="reset", **attrs):
    """
    Reset button
    """
    _set_input_attrs(attrs, type, name, value)
    _set_id_attr(attrs, id, name)
    convert_boolean_attrs(attrs, ["disabled"])
    return HTML.input(**attrs)

reset = _reset
safeid = _make_safe_id_component


def branding(name, length=40):
    return truncate(name, length, indicator="")


def FID(raw_id, path):
    """
    Creates a unique ID for filenode based on it's hash of path and commit
    it's safe to use in urls

    :param raw_id:
    :param path:
    """

    return 'c-%s-%s' % (short_id(raw_id), md5_safe(path)[:12])


class _GetError(object):
    """Get error from form_errors, and represent it as span wrapped error
    message

    :param field_name: field to fetch errors for
    :param form_errors: form errors dict
    """

    def __call__(self, field_name, form_errors):
        tmpl = """<span class="error_msg">%s</span>"""
        if form_errors and field_name in form_errors:
            return literal(tmpl % form_errors.get(field_name))

get_error = _GetError()


class _ToolTip(object):

    def __call__(self, tooltip_title, trim_at=50):
        """
        Special function just to wrap our text into nice formatted
        autowrapped text

        :param tooltip_title:
        """
        tooltip_title = escape(tooltip_title)
        tooltip_title = tooltip_title.replace('<', '&lt;').replace('>', '&gt;')
        return tooltip_title
tooltip = _ToolTip()


def files_breadcrumbs(repo_name, commit_id, file_path):
    if isinstance(file_path, str):
        file_path = safe_unicode(file_path)

    # TODO: johbo: Is this always a url like path, or is this operating
    # system dependent?
    path_segments = file_path.split('/')

    repo_name_html = escape(repo_name)
    if len(path_segments) == 1 and path_segments[0] == '':
        url_segments = [repo_name_html]
    else:
        url_segments = [
            link_to(
                repo_name_html,
                url('files_home',
                    repo_name=repo_name,
                    revision=commit_id,
                    f_path=''),
                class_='pjax-link')]

    last_cnt = len(path_segments) - 1
    for cnt, segment in enumerate(path_segments):
        if not segment:
            continue
        segment_html = escape(segment)

        if cnt != last_cnt:
            url_segments.append(
                link_to(
                    segment_html,
                    url('files_home',
                        repo_name=repo_name,
                        revision=commit_id,
                        f_path='/'.join(path_segments[:cnt + 1])),
                    class_='pjax-link'))
        else:
            url_segments.append(segment_html)

    return literal('/'.join(url_segments))


class CodeHtmlFormatter(HtmlFormatter):
    """
    My code Html Formatter for source codes
    """

    def wrap(self, source, outfile):
        return self._wrap_div(self._wrap_pre(self._wrap_code(source)))

    def _wrap_code(self, source):
        for cnt, it in enumerate(source):
            i, t = it
            t = '<div id="L%s">%s</div>' % (cnt + 1, t)
            yield i, t

    def _wrap_tablelinenos(self, inner):
        dummyoutfile = StringIO.StringIO()
        lncount = 0
        for t, line in inner:
            if t:
                lncount += 1
            dummyoutfile.write(line)

        fl = self.linenostart
        mw = len(str(lncount + fl - 1))
        sp = self.linenospecial
        st = self.linenostep
        la = self.lineanchors
        aln = self.anchorlinenos
        nocls = self.noclasses
        if sp:
            lines = []

            for i in range(fl, fl + lncount):
                if i % st == 0:
                    if i % sp == 0:
                        if aln:
                            lines.append('<a href="#%s%d" class="special">%*d</a>' %
                                         (la, i, mw, i))
                        else:
                            lines.append('<span class="special">%*d</span>' % (mw, i))
                    else:
                        if aln:
                            lines.append('<a href="#%s%d">%*d</a>' % (la, i, mw, i))
                        else:
                            lines.append('%*d' % (mw, i))
                else:
                    lines.append('')
            ls = '\n'.join(lines)
        else:
            lines = []
            for i in range(fl, fl + lncount):
                if i % st == 0:
                    if aln:
                        lines.append('<a href="#%s%d">%*d</a>' % (la, i, mw, i))
                    else:
                        lines.append('%*d' % (mw, i))
                else:
                    lines.append('')
            ls = '\n'.join(lines)

        # in case you wonder about the seemingly redundant <div> here: since the
        # content in the other cell also is wrapped in a div, some browsers in
        # some configurations seem to mess up the formatting...
        if nocls:
            yield 0, ('<table class="%stable">' % self.cssclass +
                      '<tr><td><div class="linenodiv" '
                      'style="background-color: #f0f0f0; padding-right: 10px">'
                      '<pre style="line-height: 125%">' +
                      ls + '</pre></div></td><td id="hlcode" class="code">')
        else:
            yield 0, ('<table class="%stable">' % self.cssclass +
                      '<tr><td class="linenos"><div class="linenodiv"><pre>' +
                      ls + '</pre></div></td><td id="hlcode" class="code">')
        yield 0, dummyoutfile.getvalue()
        yield 0, '</td></tr></table>'


class SearchContentCodeHtmlFormatter(CodeHtmlFormatter):
    def __init__(self, **kw):
        # only show these line numbers if set
        self.only_lines = kw.pop('only_line_numbers', [])
        self.query_terms = kw.pop('query_terms', [])
        self.max_lines = kw.pop('max_lines', 5)
        self.line_context = kw.pop('line_context', 3)
        self.url = kw.pop('url', None)

        super(CodeHtmlFormatter, self).__init__(**kw)

    def _wrap_code(self, source):
        for cnt, it in enumerate(source):
            i, t = it
            t = '<pre>%s</pre>' % t
            yield i, t

    def _wrap_tablelinenos(self, inner):
        yield 0, '<table class="code-highlight %stable">' % self.cssclass

        last_shown_line_number = 0
        current_line_number = 1

        for t, line in inner:
            if not t:
                yield t, line
                continue

            if current_line_number in self.only_lines:
                if last_shown_line_number + 1 != current_line_number:
                    yield 0, '<tr>'
                    yield 0, '<td class="line">...</td>'
                    yield 0, '<td id="hlcode" class="code"></td>'
                    yield 0, '</tr>'

                yield 0, '<tr>'
                if self.url:
                    yield 0, '<td class="line"><a href="%s#L%i">%i</a></td>' % (
                        self.url, current_line_number, current_line_number)
                else:
                    yield 0, '<td class="line"><a href="">%i</a></td>' % (
                        current_line_number)
                yield 0, '<td id="hlcode" class="code">' + line + '</td>'
                yield 0, '</tr>'

                last_shown_line_number = current_line_number

            current_line_number += 1


        yield 0, '</table>'


def extract_phrases(text_query):
    """
    Extracts phrases from search term string making sure phrases
    contained in double quotes are kept together - and discarding empty values
    or fully whitespace values eg.

    'some   text "a phrase" more' => ['some', 'text', 'a phrase', 'more']

    """

    in_phrase = False
    buf = ''
    phrases = []
    for char in text_query:
        if in_phrase:
            if char == '"': # end phrase
                phrases.append(buf)
                buf = ''
                in_phrase = False
                continue
            else:
                buf += char
                continue
        else:
            if char == '"': # start phrase
                in_phrase = True
                phrases.append(buf)
                buf = ''
                continue
            elif char == ' ':
                phrases.append(buf)
                buf = ''
                continue
            else:
                buf += char

    phrases.append(buf)
    phrases = [phrase.strip() for phrase in phrases if phrase.strip()]
    return phrases


def get_matching_offsets(text, phrases):
    """
    Returns a list of string offsets in `text` that the list of `terms` match

    >>> get_matching_offsets('some text here', ['some', 'here'])
    [(0, 4), (10, 14)]

    """
    offsets = []
    for phrase in phrases:
        for match in re.finditer(phrase, text):
            offsets.append((match.start(), match.end()))

    return offsets


def normalize_text_for_matching(x):
    """
    Replaces all non alnum characters to spaces and lower cases the string,
    useful for comparing two text strings without punctuation
    """
    return re.sub(r'[^\w]', ' ', x.lower())


def get_matching_line_offsets(lines, terms):
    """ Return a set of `lines` indices (starting from 1) matching a
    text search query, along with `context` lines above/below matching lines

    :param lines: list of strings representing lines
    :param terms: search term string to match in lines eg. 'some text'
    :param context: number of lines above/below a matching line to add to result
    :param max_lines: cut off for lines of interest
     eg.

    text = '''
    words words words
    words words words
    some text some
    words words words
    words words words
    text here what
    '''
    get_matching_line_offsets(text, 'text', context=1)
    {3: [(5, 9)], 6: [(0, 4)]]

    """
    matching_lines = {}
    phrases = [normalize_text_for_matching(phrase)
               for phrase in extract_phrases(terms)]

    for line_index, line in enumerate(lines, start=1):
        match_offsets = get_matching_offsets(
            normalize_text_for_matching(line), phrases)
        if match_offsets:
            matching_lines[line_index] = match_offsets

    return matching_lines


def get_lexer_safe(mimetype=None, filepath=None):
    """
    Tries to return a relevant pygments lexer using mimetype/filepath name,
    defaulting to plain text if none could be found
    """
    lexer = None
    try:
        if mimetype:
            lexer = get_lexer_for_mimetype(mimetype)
        if not lexer:
            lexer = get_lexer_for_filename(filepath)
    except pygments.util.ClassNotFound:
        pass

    if not lexer:
        lexer = get_lexer_by_name('text')

    return lexer


def pygmentize(filenode, **kwargs):
    """
    pygmentize function using pygments

    :param filenode:
    """
    lexer = get_custom_lexer(filenode.extension) or filenode.lexer
    return literal(code_highlight(filenode.content, lexer,
                                  CodeHtmlFormatter(**kwargs)))


def pygmentize_annotation(repo_name, filenode, **kwargs):
    """
    pygmentize function for annotation

    :param filenode:
    """

    color_dict = {}

    def gen_color(n=10000):
        """generator for getting n of evenly distributed colors using
        hsv color and golden ratio. It always return same order of colors

        :returns: RGB tuple
        """

        def hsv_to_rgb(h, s, v):
            if s == 0.0:
                return v, v, v
            i = int(h * 6.0)  # XXX assume int() truncates!
            f = (h * 6.0) - i
            p = v * (1.0 - s)
            q = v * (1.0 - s * f)
            t = v * (1.0 - s * (1.0 - f))
            i = i % 6
            if i == 0:
                return v, t, p
            if i == 1:
                return q, v, p
            if i == 2:
                return p, v, t
            if i == 3:
                return p, q, v
            if i == 4:
                return t, p, v
            if i == 5:
                return v, p, q

        golden_ratio = 0.618033988749895
        h = 0.22717784590367374

        for _ in xrange(n):
            h += golden_ratio
            h %= 1
            HSV_tuple = [h, 0.95, 0.95]
            RGB_tuple = hsv_to_rgb(*HSV_tuple)
            yield map(lambda x: str(int(x * 256)), RGB_tuple)

    cgenerator = gen_color()

    def get_color_string(commit_id):
        if commit_id in color_dict:
            col = color_dict[commit_id]
        else:
            col = color_dict[commit_id] = cgenerator.next()
        return "color: rgb(%s)! important;" % (', '.join(col))

    def url_func(repo_name):

        def _url_func(commit):
            author = commit.author
            date = commit.date
            message = tooltip(commit.message)

            tooltip_html = ("<div style='font-size:0.8em'><b>Author:</b>"
                            " %s<br/><b>Date:</b> %s</b><br/><b>Message:"
                            "</b> %s<br/></div>")

            tooltip_html = tooltip_html % (author, date, message)
            lnk_format = '%5s:%s' % ('r%s' % commit.idx, commit.short_id)
            uri = link_to(
                lnk_format,
                url('changeset_home', repo_name=repo_name,
                    revision=commit.raw_id),
                style=get_color_string(commit.raw_id),
                class_='tooltip',
                title=tooltip_html
            )

            uri += '\n'
            return uri
        return _url_func

    return literal(annotate_highlight(filenode, url_func(repo_name), **kwargs))


def is_following_repo(repo_name, user_id):
    from rhodecode.model.scm import ScmModel
    return ScmModel().is_following_repo(repo_name, user_id)


class _Message(object):
    """A message returned by ``Flash.pop_messages()``.

    Converting the message to a string returns the message text. Instances
    also have the following attributes:

    * ``message``: the message text.
    * ``category``: the category specified when the message was created.
    """

    def __init__(self, category, message):
        self.category = category
        self.message = message

    def __str__(self):
        return self.message

    __unicode__ = __str__

    def __html__(self):
        return escape(safe_unicode(self.message))


class Flash(_Flash):

    def pop_messages(self):
        """Return all accumulated messages and delete them from the session.

        The return value is a list of ``Message`` objects.
        """
        from pylons import session

        messages = []

        # Pop the 'old' pylons flash messages. They are tuples of the form
        # (category, message)
        for cat, msg in session.pop(self.session_key, []):
            messages.append(_Message(cat, msg))

        # Pop the 'new' pyramid flash messages for each category as list
        # of strings.
        for cat in self.categories:
            for msg in session.pop_flash(queue=cat):
                messages.append(_Message(cat, msg))
        # Map messages from the default queue to the 'notice' category.
        for msg in session.pop_flash():
            messages.append(_Message('notice', msg))

        session.save()
        return messages

flash = Flash()

#==============================================================================
# SCM FILTERS available via h.
#==============================================================================
from rhodecode.lib.vcs.utils import author_name, author_email
from rhodecode.lib.utils2 import credentials_filter, age as _age
from rhodecode.model.db import User, ChangesetStatus

age = _age
capitalize = lambda x: x.capitalize()
email = author_email
short_id = lambda x: x[:12]
hide_credentials = lambda x: ''.join(credentials_filter(x))


def age_component(datetime_iso, value=None, time_is_local=False):
    title = value or format_date(datetime_iso)

    # detect if we have a timezone info, otherwise, add it
    if isinstance(datetime_iso, datetime) and not datetime_iso.tzinfo:
        tzinfo = '+00:00'

        if time_is_local:
            tzinfo = time.strftime("+%H:%M",
                time.gmtime(
                    (datetime.now() - datetime.utcnow()).seconds + 1
                )
            )

    return literal(
        '<time class="timeago tooltip" '
        'title="{1}" datetime="{0}{2}">{1}</time>'.format(
            datetime_iso, title, tzinfo))


def _shorten_commit_id(commit_id):
    from rhodecode import CONFIG
    def_len = safe_int(CONFIG.get('rhodecode_show_sha_length', 12))
    return commit_id[:def_len]


def show_id(commit):
    """
    Configurable function that shows ID
    by default it's r123:fffeeefffeee

    :param commit: commit instance
    """
    from rhodecode import CONFIG
    show_idx = str2bool(CONFIG.get('rhodecode_show_revision_number', True))

    raw_id = _shorten_commit_id(commit.raw_id)
    if show_idx:
        return 'r%s:%s' % (commit.idx, raw_id)
    else:
        return '%s' % (raw_id, )


def format_date(date):
    """
    use a standardized formatting for dates used in RhodeCode

    :param date: date/datetime object
    :return: formatted date
    """

    if date:
        _fmt = "%a, %d %b %Y %H:%M:%S"
        return safe_unicode(date.strftime(_fmt))

    return u""


class _RepoChecker(object):

    def __init__(self, backend_alias):
        self._backend_alias = backend_alias

    def __call__(self, repository):
        if hasattr(repository, 'alias'):
            _type = repository.alias
        elif hasattr(repository, 'repo_type'):
            _type = repository.repo_type
        else:
            _type = repository
        return _type == self._backend_alias

is_git = _RepoChecker('git')
is_hg = _RepoChecker('hg')
is_svn = _RepoChecker('svn')


def get_repo_type_by_name(repo_name):
    repo = Repository.get_by_repo_name(repo_name)
    return repo.repo_type


def is_svn_without_proxy(repository):
    from rhodecode import CONFIG
    if is_svn(repository):
        if not CONFIG.get('rhodecode_proxy_subversion_http_requests', False):
            return True
    return False


def discover_user(author):
    """
    Tries to discover RhodeCode User based on the autho string. Author string
    is typically `FirstName LastName <[e-mail]>`
    """

    # if author is already an instance use it for extraction
    if isinstance(author, User):
        return author

    # Valid email in the attribute passed, see if they're in the system
    _email = author_email(author)
    if _email != '':
        user = User.get_by_email(_email, case_insensitive=True, cache=True)
        if user is not None:
            return user

    # Maybe it's a username, we try to extract it and fetch by username ?
    _author = author_name(author)
    user = User.get_by_username(_author, case_insensitive=True, cache=True)
    if user is not None:
        return user

    return None


def email_or_none(author):
    # extract email from the commit string
    _email = author_email(author)
    if _email != '':
        # check it against RhodeCode database, and use the MAIN email for this
        # user
        user = User.get_by_email(_email, case_insensitive=True, cache=True)
        if user is not None:
            return user.email
        return _email

    # See if it contains a username we can get an email from
    user = User.get_by_username(author_name(author), case_insensitive=True,
                                cache=True)
    if user is not None:
        return user.email

    # No valid email, not a valid user in the system, none!
    return None


def link_to_user(author, length=0, **kwargs):
    user = discover_user(author)
    # user can be None, but if we have it already it means we can re-use it
    # in the person() function, so we save 1 intensive-query
    if user:
        author = user

    display_person = person(author, 'username_or_name_or_email')
    if length:
        display_person = shorter(display_person, length)

    if user:
        return link_to(
            escape(display_person),
            url('user_profile', username=user.username),
            **kwargs)
    else:
        return escape(display_person)


def person(author, show_attr="username_and_name"):
    user = discover_user(author)
    if user:
        return getattr(user, show_attr)
    else:
        _author = author_name(author)
        _email = email(author)
        return _author or _email


def person_by_id(id_, show_attr="username_and_name"):
    # attr to return from fetched user
    person_getter = lambda usr: getattr(usr, show_attr)

    #maybe it's an ID ?
    if str(id_).isdigit() or isinstance(id_, int):
        id_ = int(id_)
        user = User.get(id_)
        if user is not None:
            return person_getter(user)
    return id_


def gravatar_with_user(author, show_disabled=False):
    from rhodecode.lib.utils import PartialRenderer
    _render = PartialRenderer('base/base.html')
    return _render('gravatar_with_user', author, show_disabled=show_disabled)


def desc_stylize(value):
    """
    converts tags from value into html equivalent

    :param value:
    """
    if not value:
        return ''

    value = re.sub(r'\[see\ \=\>\ *([a-zA-Z0-9\/\=\?\&\ \:\/\.\-]*)\]',
                   '<div class="metatag" tag="see">see =&gt; \\1 </div>', value)
    value = re.sub(r'\[license\ \=\>\ *([a-zA-Z0-9\/\=\?\&\ \:\/\.\-]*)\]',
                   '<div class="metatag" tag="license"><a href="http:\/\/www.opensource.org/licenses/\\1">\\1</a></div>', value)
    value = re.sub(r'\[(requires|recommends|conflicts|base)\ \=\>\ *([a-zA-Z0-9\-\/]*)\]',
                   '<div class="metatag" tag="\\1">\\1 =&gt; <a href="/\\2">\\2</a></div>', value)
    value = re.sub(r'\[(lang|language)\ \=\>\ *([a-zA-Z\-\/\#\+]*)\]',
                   '<div class="metatag" tag="lang">\\2</div>', value)
    value = re.sub(r'\[([a-z]+)\]',
                   '<div class="metatag" tag="\\1">\\1</div>', value)

    return value


def escaped_stylize(value):
    """
    converts tags from value into html equivalent, but escaping its value first
    """
    if not value:
        return ''

    # Using default webhelper escape method, but has to force it as a
    # plain unicode instead of a markup tag to be used in regex expressions
    value = unicode(escape(safe_unicode(value)))

    value = re.sub(r'\[see\ \=\&gt;\ *([a-zA-Z0-9\/\=\?\&amp;\ \:\/\.\-]*)\]',
                   '<div class="metatag" tag="see">see =&gt; \\1 </div>', value)
    value = re.sub(r'\[license\ \=\&gt;\ *([a-zA-Z0-9\/\=\?\&amp;\ \:\/\.\-]*)\]',
                   '<div class="metatag" tag="license"><a href="http:\/\/www.opensource.org/licenses/\\1">\\1</a></div>', value)
    value = re.sub(r'\[(requires|recommends|conflicts|base)\ \=\&gt;\ *([a-zA-Z0-9\-\/]*)\]',
                   '<div class="metatag" tag="\\1">\\1 =&gt; <a href="/\\2">\\2</a></div>', value)
    value = re.sub(r'\[(lang|language)\ \=\&gt;\ *([a-zA-Z\-\/\#\+]*)\]',
                   '<div class="metatag" tag="lang">\\2</div>', value)
    value = re.sub(r'\[([a-z]+)\]',
                   '<div class="metatag" tag="\\1">\\1</div>', value)

    return value


def bool2icon(value):
    """
    Returns boolean value of a given value, represented as html element with
    classes that will represent icons

    :param value: given value to convert to html node
    """

    if value:  # does bool conversion
        return HTML.tag('i', class_="icon-true")
    else:  # not true as bool
        return HTML.tag('i', class_="icon-false")


#==============================================================================
# PERMS
#==============================================================================
from rhodecode.lib.auth import HasPermissionAny, HasPermissionAll, \
HasRepoPermissionAny, HasRepoPermissionAll, HasRepoGroupPermissionAll, \
HasRepoGroupPermissionAny, HasRepoPermissionAnyApi, get_csrf_token


#==============================================================================
# GRAVATAR URL
#==============================================================================
class InitialsGravatar(object):
    def __init__(self, email_address, first_name, last_name, size=30,
                 background=None, text_color='#fff'):
        self.size = size
        self.first_name = first_name
        self.last_name = last_name
        self.email_address = email_address
        self.background = background or self.str2color(email_address)
        self.text_color = text_color

    def get_color_bank(self):
        """
        returns a predefined list of colors that gravatars can use.
        Those are randomized distinct colors that guarantee readability and
        uniqueness.

        generated with: http://phrogz.net/css/distinct-colors.html
        """
        return [
            '#bf3030', '#a67f53', '#00ff00', '#5989b3', '#392040', '#d90000',
            '#402910', '#204020', '#79baf2', '#a700b3', '#bf6060', '#7f5320',
            '#008000', '#003059', '#ee00ff', '#ff0000', '#8c4b00', '#007300',
            '#005fb3', '#de73e6', '#ff4040', '#ffaa00', '#3df255', '#203140',
            '#47004d', '#591616', '#664400', '#59b365', '#0d2133', '#83008c',
            '#592d2d', '#bf9f60', '#73e682', '#1d3f73', '#73006b', '#402020',
            '#b2862d', '#397341', '#597db3', '#e600d6', '#a60000', '#736039',
            '#00b318', '#79aaf2', '#330d30', '#ff8080', '#403010', '#16591f',
            '#002459', '#8c4688', '#e50000', '#ffbf40', '#00732e', '#102340',
            '#bf60ac', '#8c4646', '#cc8800', '#00a642', '#1d3473', '#b32d98',
            '#660e00', '#ffd580', '#80ffb2', '#7391e6', '#733967', '#d97b6c',
            '#8c5e00', '#59b389', '#3967e6', '#590047', '#73281d', '#665200',
            '#00e67a', '#2d50b3', '#8c2377', '#734139', '#b2982d', '#16593a',
            '#001859', '#ff00aa', '#a65e53', '#ffcc00', '#0d3321', '#2d3959',
            '#731d56', '#401610', '#4c3d00', '#468c6c', '#002ca6', '#d936a3',
            '#d94c36', '#403920', '#36d9a3', '#0d1733', '#592d4a', '#993626',
            '#cca300', '#00734d', '#46598c', '#8c005e', '#7f1100', '#8c7000',
            '#00a66f', '#7382e6', '#b32d74', '#d9896c', '#ffe680', '#1d7362',
            '#364cd9', '#73003d', '#d93a00', '#998a4d', '#59b3a1', '#5965b3',
            '#e5007a', '#73341d', '#665f00', '#00b38f', '#0018b3', '#59163a',
            '#b2502d', '#bfb960', '#00ffcc', '#23318c', '#a6537f', '#734939',
            '#b2a700', '#104036', '#3d3df2', '#402031', '#e56739', '#736f39',
            '#79f2ea', '#000059', '#401029', '#4c1400', '#ffee00', '#005953',
            '#101040', '#990052', '#402820', '#403d10', '#00ffee', '#0000d9',
            '#ff80c4', '#a66953', '#eeff00', '#00ccbe', '#8080ff', '#e673a1',
            '#a62c00', '#474d00', '#1a3331', '#46468c', '#733950', '#662900',
            '#858c23', '#238c85', '#0f0073', '#b20047', '#d9986c', '#becc00',
            '#396f73', '#281d73', '#ff0066', '#ff6600', '#dee673', '#59adb3',
            '#6559b3', '#590024', '#b2622d', '#98b32d', '#36ced9', '#332d59',
            '#40001a', '#733f1d', '#526600', '#005359', '#242040', '#bf6079',
            '#735039', '#cef23d', '#007780', '#5630bf', '#66001b', '#b24700',
            '#acbf60', '#1d6273', '#25008c', '#731d34', '#a67453', '#50592d',
            '#00ccff', '#6600ff', '#ff0044', '#4c1f00', '#8a994d', '#79daf2',
            '#a173e6', '#d93662', '#402310', '#aaff00', '#2d98b3', '#8c40ff',
            '#592d39', '#ff8c40', '#354020', '#103640', '#1a0040', '#331a20',
            '#331400', '#334d00', '#1d5673', '#583973', '#7f0022', '#4c3626',
            '#88cc00', '#36a3d9', '#3d0073', '#d9364c', '#33241a', '#698c23',
            '#5995b3', '#300059', '#e57382', '#7f3300', '#366600', '#00aaff',
            '#3a1659', '#733941', '#663600', '#74b32d', '#003c59', '#7f53a6',
            '#73000f', '#ff8800', '#baf279', '#79caf2', '#291040', '#a6293a',
            '#b2742d', '#587339', '#0077b3', '#632699', '#400009', '#d9a66c',
            '#294010', '#2d4a59', '#aa00ff', '#4c131b', '#b25f00', '#5ce600',
            '#267399', '#a336d9', '#990014', '#664e33', '#86bf60', '#0088ff',
            '#7700b3', '#593a16', '#073300', '#1d4b73', '#ac60bf', '#e59539',
            '#4f8c46', '#368dd9', '#5c0073'
        ]

    def rgb_to_hex_color(self, rgb_tuple):
        """
        Converts an rgb_tuple passed to an hex color.

        :param rgb_tuple: tuple with 3 ints represents rgb color space
        """
        return '#' + ("".join(map(chr, rgb_tuple)).encode('hex'))

    def email_to_int_list(self, email_str):
        """
        Get every byte of the hex digest value of email and turn it to integer.
        It's going to be always between 0-255
        """
        digest = md5_safe(email_str.lower())
        return [int(digest[i * 2:i * 2 + 2], 16) for i in range(16)]

    def pick_color_bank_index(self, email_str, color_bank):
        return self.email_to_int_list(email_str)[0] % len(color_bank)

    def str2color(self, email_str):
        """
        Tries to map in a stable algorithm an email to color

        :param email_str:
        """
        color_bank = self.get_color_bank()
        # pick position (module it's length so we always find it in the
        # bank even if it's smaller than 256 values
        pos = self.pick_color_bank_index(email_str, color_bank)
        return color_bank[pos]

    def normalize_email(self, email_address):
        import unicodedata
        # default host used to fill in the fake/missing email
        default_host = u'localhost'

        if not email_address:
            email_address = u'%s@%s' % (User.DEFAULT_USER, default_host)

        email_address = safe_unicode(email_address)

        if u'@' not in email_address:
            email_address = u'%s@%s' % (email_address, default_host)

        if email_address.endswith(u'@'):
            email_address = u'%s%s' % (email_address, default_host)

        email_address = unicodedata.normalize('NFKD', email_address)\
            .encode('ascii', 'ignore')
        return email_address

    def get_initials(self):
        """
        Returns 2 letter initials calculated based on the input.
        The algorithm picks first given email address, and takes first letter
        of part before @, and then the first letter of server name. In case
        the part before @ is in a format of `somestring.somestring2` it replaces
        the server letter with first letter of somestring2

        In case function was initialized with both first and lastname, this
        overrides the extraction from email by first letter of the first and
        last name. We add special logic to that functionality, In case Full name
        is compound, like Guido Von Rossum, we use last part of the last name
        (Von Rossum) picking `R`.

        Function also normalizes the non-ascii characters to they ascii
        representation, eg Ą => A
        """
        import unicodedata
        # replace non-ascii to ascii
        first_name = unicodedata.normalize(
            'NFKD', safe_unicode(self.first_name)).encode('ascii', 'ignore')
        last_name = unicodedata.normalize(
            'NFKD', safe_unicode(self.last_name)).encode('ascii', 'ignore')

        # do NFKD encoding, and also make sure email has proper format
        email_address = self.normalize_email(self.email_address)

        # first push the email initials
        prefix, server = email_address.split('@', 1)

        # check if prefix is maybe a 'firstname.lastname' syntax
        _dot_split = prefix.rsplit('.', 1)
        if len(_dot_split) == 2:
            initials = [_dot_split[0][0], _dot_split[1][0]]
        else:
            initials = [prefix[0], server[0]]

        # then try to replace either firtname or lastname
        fn_letter = (first_name or " ")[0].strip()
        ln_letter = (last_name.split(' ', 1)[-1] or " ")[0].strip()

        if fn_letter:
            initials[0] = fn_letter

        if ln_letter:
            initials[1] = ln_letter

        return ''.join(initials).upper()

    def get_img_data_by_type(self, font_family, img_type):
        default_user = """
        <svg xmlns="http://www.w3.org/2000/svg"
        version="1.1" x="0px" y="0px" width="{size}" height="{size}"
        viewBox="-15 -10 439.165 429.164"

        xml:space="preserve"
        style="background:{background};" >

        <path d="M204.583,216.671c50.664,0,91.74-48.075,
                 91.74-107.378c0-82.237-41.074-107.377-91.74-107.377
                 c-50.668,0-91.74,25.14-91.74,107.377C112.844,
                 168.596,153.916,216.671,
                 204.583,216.671z" fill="{text_color}"/>
        <path d="M407.164,374.717L360.88,
                 270.454c-2.117-4.771-5.836-8.728-10.465-11.138l-71.83-37.392
                 c-1.584-0.823-3.502-0.663-4.926,0.415c-20.316,
                 15.366-44.203,23.488-69.076,23.488c-24.877,
                 0-48.762-8.122-69.078-23.488
                 c-1.428-1.078-3.346-1.238-4.93-0.415L58.75,
                 259.316c-4.631,2.41-8.346,6.365-10.465,11.138L2.001,374.717
                 c-3.191,7.188-2.537,15.412,1.75,22.005c4.285,
                 6.592,11.537,10.526,19.4,10.526h362.861c7.863,0,15.117-3.936,
                 19.402-10.527 C409.699,390.129,
                 410.355,381.902,407.164,374.717z" fill="{text_color}"/>
        </svg>""".format(
            size=self.size,
            background='#979797',  # @grey4
            text_color=self.text_color,
            font_family=font_family)

        return {
            "default_user": default_user
        }[img_type]

    def get_img_data(self, svg_type=None):
        """
        generates the svg metadata for image
        """

        font_family = ','.join([
            'proximanovaregular',
            'Proxima Nova Regular',
            'Proxima Nova',
            'Arial',
            'Lucida Grande',
            'sans-serif'
            ])
        if svg_type:
            return self.get_img_data_by_type(font_family, svg_type)

        initials = self.get_initials()
        img_data = """
        <svg xmlns="http://www.w3.org/2000/svg" pointer-events="none"
             width="{size}" height="{size}"
             style="width: 100%; height: 100%; background-color: {background}"
             viewBox="0 0 {size} {size}">
            <text text-anchor="middle" y="50%" x="50%" dy="0.35em"
                  pointer-events="auto" fill="{text_color}"
                  font-family="{font_family}"
                  style="font-weight: 400; font-size: {f_size}px;">{text}
            </text>
        </svg>""".format(
            size=self.size,
            f_size=self.size/1.85,  # scale the text inside the box nicely
            background=self.background,
            text_color=self.text_color,
            text=initials.upper(),
            font_family=font_family)

        return img_data

    def generate_svg(self, svg_type=None):
        img_data = self.get_img_data(svg_type)
        return "data:image/svg+xml;base64,%s" % img_data.encode('base64')


def initials_gravatar(email_address, first_name, last_name, size=30):
    svg_type = None
    if email_address == User.DEFAULT_USER_EMAIL:
        svg_type = 'default_user'
    klass = InitialsGravatar(email_address, first_name, last_name, size)
    return klass.generate_svg(svg_type=svg_type)


def gravatar_url(email_address, size=30):
    # doh, we need to re-import those to mock it later
    from pylons import tmpl_context as c

    _use_gravatar = c.visual.use_gravatar
    _gravatar_url = c.visual.gravatar_url or User.DEFAULT_GRAVATAR_URL

    email_address = email_address or User.DEFAULT_USER_EMAIL
    if isinstance(email_address, unicode):
        # hashlib crashes on unicode items
        email_address = safe_str(email_address)

    # empty email or default user
    if not email_address or email_address == User.DEFAULT_USER_EMAIL:
        return initials_gravatar(User.DEFAULT_USER_EMAIL, '', '', size=size)

    if _use_gravatar:
        # TODO: Disuse pyramid thread locals. Think about another solution to
        # get the host and schema here.
        request = get_current_request()
        tmpl = safe_str(_gravatar_url)
        tmpl = tmpl.replace('{email}', email_address)\
                   .replace('{md5email}', md5_safe(email_address.lower())) \
                   .replace('{netloc}', request.host)\
                   .replace('{scheme}', request.scheme)\
                   .replace('{size}', safe_str(size))
        return tmpl
    else:
        return initials_gravatar(email_address, '', '', size=size)


class Page(_Page):
    """
    Custom pager to match rendering style with paginator
    """

    def _get_pos(self, cur_page, max_page, items):
        edge = (items / 2) + 1
        if (cur_page <= edge):
            radius = max(items / 2, items - cur_page)
        elif (max_page - cur_page) < edge:
            radius = (items - 1) - (max_page - cur_page)
        else:
            radius = items / 2

        left = max(1, (cur_page - (radius)))
        right = min(max_page, cur_page + (radius))
        return left, cur_page, right

    def _range(self, regexp_match):
        """
        Return range of linked pages (e.g. '1 2 [3] 4 5 6 7 8').

        Arguments:

        regexp_match
            A "re" (regular expressions) match object containing the
            radius of linked pages around the current page in
            regexp_match.group(1) as a string

        This function is supposed to be called as a callable in
        re.sub.

        """
        radius = int(regexp_match.group(1))

        # Compute the first and last page number within the radius
        # e.g. '1 .. 5 6 [7] 8 9 .. 12'
        # -> leftmost_page  = 5
        # -> rightmost_page = 9
        leftmost_page, _cur, rightmost_page = self._get_pos(self.page,
                                                            self.last_page,
                                                            (radius * 2) + 1)
        nav_items = []

        # Create a link to the first page (unless we are on the first page
        # or there would be no need to insert '..' spacers)
        if self.page != self.first_page and self.first_page < leftmost_page:
            nav_items.append(self._pagerlink(self.first_page, self.first_page))

        # Insert dots if there are pages between the first page
        # and the currently displayed page range
        if leftmost_page - self.first_page > 1:
            # Wrap in a SPAN tag if nolink_attr is set
            text = '..'
            if self.dotdot_attr:
                text = HTML.span(c=text, **self.dotdot_attr)
            nav_items.append(text)

        for thispage in xrange(leftmost_page, rightmost_page + 1):
            # Hilight the current page number and do not use a link
            if thispage == self.page:
                text = '%s' % (thispage,)
                # Wrap in a SPAN tag if nolink_attr is set
                if self.curpage_attr:
                    text = HTML.span(c=text, **self.curpage_attr)
                nav_items.append(text)
            # Otherwise create just a link to that page
            else:
                text = '%s' % (thispage,)
                nav_items.append(self._pagerlink(thispage, text))

        # Insert dots if there are pages between the displayed
        # page numbers and the end of the page range
        if self.last_page - rightmost_page > 1:
            text = '..'
            # Wrap in a SPAN tag if nolink_attr is set
            if self.dotdot_attr:
                text = HTML.span(c=text, **self.dotdot_attr)
            nav_items.append(text)

        # Create a link to the very last page (unless we are on the last
        # page or there would be no need to insert '..' spacers)
        if self.page != self.last_page and rightmost_page < self.last_page:
            nav_items.append(self._pagerlink(self.last_page, self.last_page))

        ## prerender links
        #_page_link = url.current()
        #nav_items.append(literal('<link rel="prerender" href="%s?page=%s">' % (_page_link, str(int(self.page)+1))))
        #nav_items.append(literal('<link rel="prefetch" href="%s?page=%s">' % (_page_link, str(int(self.page)+1))))
        return self.separator.join(nav_items)

    def pager(self, format='~2~', page_param='page', partial_param='partial',
        show_if_single_page=False, separator=' ', onclick=None,
        symbol_first='<<', symbol_last='>>',
        symbol_previous='<', symbol_next='>',
        link_attr={'class': 'pager_link', 'rel': 'prerender'},
        curpage_attr={'class': 'pager_curpage'},
        dotdot_attr={'class': 'pager_dotdot'}, **kwargs):

        self.curpage_attr = curpage_attr
        self.separator = separator
        self.pager_kwargs = kwargs
        self.page_param = page_param
        self.partial_param = partial_param
        self.onclick = onclick
        self.link_attr = link_attr
        self.dotdot_attr = dotdot_attr

        # Don't show navigator if there is no more than one page
        if self.page_count == 0 or (self.page_count == 1 and not show_if_single_page):
            return ''

        from string import Template
        # Replace ~...~ in token format by range of pages
        result = re.sub(r'~(\d+)~', self._range, format)

        # Interpolate '%' variables
        result = Template(result).safe_substitute({
            'first_page': self.first_page,
            'last_page': self.last_page,
            'page': self.page,
            'page_count': self.page_count,
            'items_per_page': self.items_per_page,
            'first_item': self.first_item,
            'last_item': self.last_item,
            'item_count': self.item_count,
            'link_first': self.page > self.first_page and \
                    self._pagerlink(self.first_page, symbol_first) or '',
            'link_last': self.page < self.last_page and \
                    self._pagerlink(self.last_page, symbol_last) or '',
            'link_previous': self.previous_page and \
                    self._pagerlink(self.previous_page, symbol_previous) \
                    or HTML.span(symbol_previous, class_="pg-previous disabled"),
            'link_next': self.next_page and \
                    self._pagerlink(self.next_page, symbol_next) \
                    or HTML.span(symbol_next, class_="pg-next disabled")
        })

        return literal(result)


#==============================================================================
# REPO PAGER, PAGER FOR REPOSITORY
#==============================================================================
class RepoPage(Page):

    def __init__(self, collection, page=1, items_per_page=20,
                 item_count=None, url=None, **kwargs):

        """Create a "RepoPage" instance. special pager for paging
        repository
        """
        self._url_generator = url

        # Safe the kwargs class-wide so they can be used in the pager() method
        self.kwargs = kwargs

        # Save a reference to the collection
        self.original_collection = collection

        self.collection = collection

        # The self.page is the number of the current page.
        # The first page has the number 1!
        try:
            self.page = int(page)  # make it int() if we get it as a string
        except (ValueError, TypeError):
            self.page = 1

        self.items_per_page = items_per_page

        # Unless the user tells us how many items the collections has
        # we calculate that ourselves.
        if item_count is not None:
            self.item_count = item_count
        else:
            self.item_count = len(self.collection)

        # Compute the number of the first and last available page
        if self.item_count > 0:
            self.first_page = 1
            self.page_count = int(math.ceil(float(self.item_count) /
                                            self.items_per_page))
            self.last_page = self.first_page + self.page_count - 1

            # Make sure that the requested page number is the range of
            # valid pages
            if self.page > self.last_page:
                self.page = self.last_page
            elif self.page < self.first_page:
                self.page = self.first_page

            # Note: the number of items on this page can be less than
            #       items_per_page if the last page is not full
            self.first_item = max(0, (self.item_count) - (self.page *
                                                          items_per_page))
            self.last_item = ((self.item_count - 1) - items_per_page *
                              (self.page - 1))

            self.items = list(self.collection[self.first_item:self.last_item + 1])

            # Links to previous and next page
            if self.page > self.first_page:
                self.previous_page = self.page - 1
            else:
                self.previous_page = None

            if self.page < self.last_page:
                self.next_page = self.page + 1
            else:
                self.next_page = None

        # No items available
        else:
            self.first_page = None
            self.page_count = 0
            self.last_page = None
            self.first_item = None
            self.last_item = None
            self.previous_page = None
            self.next_page = None
            self.items = []

        # This is a subclass of the 'list' type. Initialise the list now.
        list.__init__(self, reversed(self.items))


def changed_tooltip(nodes):
    """
    Generates a html string for changed nodes in commit page.
    It limits the output to 30 entries

    :param nodes: LazyNodesGenerator
    """
    if nodes:
        pref = ': <br/> '
        suf = ''
        if len(nodes) > 30:
            suf = '<br/>' + _(' and %s more') % (len(nodes) - 30)
        return literal(pref + '<br/> '.join([safe_unicode(x.path)
                                             for x in nodes[:30]]) + suf)
    else:
        return ': ' + _('No Files')


def breadcrumb_repo_link(repo):
    """
    Makes a breadcrumbs path link to repo

    ex::
        group >> subgroup >> repo

    :param repo: a Repository instance
    """

    path = [
        link_to(group.name, url('repo_group_home', group_name=group.group_name))
        for group in repo.groups_with_parents
    ] + [
        link_to(repo.just_name, url('summary_home', repo_name=repo.repo_name))
    ]

    return literal(' &raquo; '.join(path))


def format_byte_size_binary(file_size):
    """
    Formats file/folder sizes to standard.
    """
    formatted_size = format_byte_size(file_size, binary=True)
    return formatted_size


def fancy_file_stats(stats):
    """
    Displays a fancy two colored bar for number of added/deleted
    lines of code on file

    :param stats: two element list of added/deleted lines of code
    """
    from rhodecode.lib.diffs import NEW_FILENODE, DEL_FILENODE, \
        MOD_FILENODE, RENAMED_FILENODE, CHMOD_FILENODE, BIN_FILENODE

    def cgen(l_type, a_v, d_v):
        mapping = {'tr': 'top-right-rounded-corner-mid',
                   'tl': 'top-left-rounded-corner-mid',
                   'br': 'bottom-right-rounded-corner-mid',
                   'bl': 'bottom-left-rounded-corner-mid'}
        map_getter = lambda x: mapping[x]

        if l_type == 'a' and d_v:
            #case when added and deleted are present
            return ' '.join(map(map_getter, ['tl', 'bl']))

        if l_type == 'a' and not d_v:
            return ' '.join(map(map_getter, ['tr', 'br', 'tl', 'bl']))

        if l_type == 'd' and a_v:
            return ' '.join(map(map_getter, ['tr', 'br']))

        if l_type == 'd' and not a_v:
            return ' '.join(map(map_getter, ['tr', 'br', 'tl', 'bl']))

    a, d = stats['added'], stats['deleted']
    width = 100

    if stats['binary']:  # binary operations like chmod/rename etc
        lbl = []
        bin_op = 0  # undefined

        # prefix with bin for binary files
        if BIN_FILENODE in stats['ops']:
            lbl += ['bin']

        if NEW_FILENODE in stats['ops']:
            lbl += [_('new file')]
            bin_op = NEW_FILENODE
        elif MOD_FILENODE in stats['ops']:
            lbl += [_('mod')]
            bin_op = MOD_FILENODE
        elif DEL_FILENODE in stats['ops']:
            lbl += [_('del')]
            bin_op = DEL_FILENODE
        elif RENAMED_FILENODE in stats['ops']:
            lbl += [_('rename')]
            bin_op = RENAMED_FILENODE

        # chmod can go with other operations, so we add a + to lbl if needed
        if CHMOD_FILENODE in stats['ops']:
            lbl += [_('chmod')]
            if bin_op == 0:
                bin_op = CHMOD_FILENODE

        lbl = '+'.join(lbl)
        b_a = '<div class="bin bin%s %s" style="width:100%%">%s</div>' \
              % (bin_op, cgen('a', a_v='', d_v=0), lbl)
        b_d = '<div class="bin bin1" style="width:0%%"></div>'
        return literal('<div style="width:%spx">%s%s</div>' % (width, b_a, b_d))

    t = stats['added'] + stats['deleted']
    unit = float(width) / (t or 1)

    # needs > 9% of width to be visible or 0 to be hidden
    a_p = max(9, unit * a) if a > 0 else 0
    d_p = max(9, unit * d) if d > 0 else 0
    p_sum = a_p + d_p

    if p_sum > width:
        #adjust the percentage to be == 100% since we adjusted to 9
        if a_p > d_p:
            a_p = a_p - (p_sum - width)
        else:
            d_p = d_p - (p_sum - width)

    a_v = a if a > 0 else ''
    d_v = d if d > 0 else ''

    d_a = '<div class="added %s" style="width:%s%%">%s</div>' % (
        cgen('a', a_v, d_v), a_p, a_v
    )
    d_d = '<div class="deleted %s" style="width:%s%%">%s</div>' % (
        cgen('d', a_v, d_v), d_p, d_v
    )
    return literal('<div style="width:%spx">%s%s</div>' % (width, d_a, d_d))


def urlify_text(text_, safe=True):
    """
    Extrac urls from text and make html links out of them

    :param text_:
    """

    url_pat = re.compile(r'''(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@#.&+]'''
                         '''|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)''')

    def url_func(match_obj):
        url_full = match_obj.groups()[0]
        return '<a href="%(url)s">%(url)s</a>' % ({'url': url_full})
    _newtext = url_pat.sub(url_func, text_)
    if safe:
        return literal(_newtext)
    return _newtext


def urlify_commits(text_, repository):
    """
    Extract commit ids from text and make link from them

    :param text_:
    :param repository: repo name to build the URL with
    """
    from pylons import url  # doh, we need to re-import url to mock it later
    URL_PAT = re.compile(r'(^|\s)([0-9a-fA-F]{12,40})($|\s)')

    def url_func(match_obj):
        commit_id = match_obj.groups()[1]
        pref = match_obj.groups()[0]
        suf = match_obj.groups()[2]

        tmpl = (
            '%(pref)s<a class="%(cls)s" href="%(url)s">'
            '%(commit_id)s</a>%(suf)s'
        )
        return tmpl % {
            'pref': pref,
            'cls': 'revision-link',
            'url': url('changeset_home', repo_name=repository,
                       revision=commit_id),
            'commit_id': commit_id,
            'suf': suf
        }

    newtext = URL_PAT.sub(url_func, text_)

    return newtext


def _process_url_func(match_obj, repo_name, uid, entry):
    pref = ''
    if match_obj.group().startswith(' '):
        pref = ' '

    issue_id = ''.join(match_obj.groups())
    tmpl = (
        '%(pref)s<a class="%(cls)s" href="%(url)s">'
        '%(issue-prefix)s%(id-repr)s'
        '</a>')

    (repo_name_cleaned,
     parent_group_name) = RepoGroupModel().\
        _get_group_name_and_parent(repo_name)

    # variables replacement
    named_vars = {
        'id': issue_id,
        'repo': repo_name,
        'repo_name': repo_name_cleaned,
        'group_name': parent_group_name
    }
    # named regex variables
    named_vars.update(match_obj.groupdict())
    _url = string.Template(entry['url']).safe_substitute(**named_vars)

    return tmpl % {
        'pref': pref,
        'cls': 'issue-tracker-link',
        'url': _url,
        'id-repr': issue_id,
        'issue-prefix': entry['pref'],
        'serv': entry['url'],
    }


def process_patterns(text_string, repo_name, config):
    repo = None
    if repo_name:
        # Retrieving repo_name to avoid invalid repo_name to explode on
        # IssueTrackerSettingsModel but still passing invalid name further down
        repo = Repository.get_by_repo_name(repo_name)

    settings_model = IssueTrackerSettingsModel(repo=repo)
    active_entries = settings_model.get_settings()

    newtext = text_string
    for uid, entry in active_entries.items():
        url_func = partial(
            _process_url_func, repo_name=repo_name, entry=entry, uid=uid)

        log.debug('found issue tracker entry with uid %s' % (uid,))

        if not (entry['pat'] and entry['url']):
            log.debug('skipping due to missing data')
            continue

        log.debug('issue tracker entry: uid: `%s` PAT:%s URL:%s PREFIX:%s'
                  % (uid, entry['pat'], entry['url'], entry['pref']))

        try:
            pattern = re.compile(r'%s' % entry['pat'])
        except re.error:
            log.exception(
                'issue tracker pattern: `%s` failed to compile',
                entry['pat'])
            continue

        newtext = pattern.sub(url_func, newtext)
        log.debug('processed prefix:uid `%s`' % (uid,))

    return newtext


def urlify_commit_message(commit_text, repository=None):
    """
    Parses given text message and makes proper links.
    issues are linked to given issue-server, and rest is a commit link

    :param commit_text:
    :param repository:
    """
    from pylons import url  # doh, we need to re-import url to mock it later
    from rhodecode import CONFIG

    def escaper(string):
        return string.replace('<', '&lt;').replace('>', '&gt;')

    newtext = escaper(commit_text)
    # urlify commits - extract commit ids and make link out of them, if we have
    # the scope of repository present.
    if repository:
        newtext = urlify_commits(newtext, repository)

    # extract http/https links and make them real urls
    newtext = urlify_text(newtext, safe=False)

    # process issue tracker patterns
    newtext = process_patterns(newtext, repository or '', CONFIG)

    return literal(newtext)


def rst(source, mentions=False):
    return literal('<div class="rst-block">%s</div>' %
                   MarkupRenderer.rst(source, mentions=mentions))


def markdown(source, mentions=False):
    return literal('<div class="markdown-block">%s</div>' %
                   MarkupRenderer.markdown(source, flavored=False,
                                           mentions=mentions))

def renderer_from_filename(filename, exclude=None):
    from rhodecode.config.conf import MARKDOWN_EXTS, RST_EXTS

    def _filter(elements):
        if isinstance(exclude, (list, tuple)):
            return [x for x in elements if x not in exclude]
        return elements

    if filename.endswith(tuple(_filter([x[0] for x in MARKDOWN_EXTS if x[0]]))):
        return 'markdown'
    if filename.endswith(tuple(_filter([x[0] for x in RST_EXTS if x[0]]))):
        return 'rst'


def render(source, renderer='rst', mentions=False):
    if renderer == 'rst':
        return rst(source, mentions=mentions)
    if renderer == 'markdown':
        return markdown(source, mentions=mentions)


def commit_status(repo, commit_id):
    return ChangesetStatusModel().get_status(repo, commit_id)


def commit_status_lbl(commit_status):
    return dict(ChangesetStatus.STATUSES).get(commit_status)


def commit_time(repo_name, commit_id):
    repo = Repository.get_by_repo_name(repo_name)
    commit = repo.get_commit(commit_id=commit_id)
    return commit.date


def get_permission_name(key):
    return dict(Permission.PERMS).get(key)


def journal_filter_help():
    return _(
        'Example filter terms:\n' +
        '     repository:vcs\n' +
        '     username:marcin\n' +
        '     action:*push*\n' +
        '     ip:127.0.0.1\n' +
        '     date:20120101\n' +
        '     date:[20120101100000 TO 20120102]\n' +
        '\n' +
        'Generate wildcards using \'*\' character:\n' +
        '     "repository:vcs*" - search everything starting with \'vcs\'\n' +
        '     "repository:*vcs*" - search for repository containing \'vcs\'\n' +
        '\n' +
        'Optional AND / OR operators in queries\n' +
        '     "repository:vcs OR repository:test"\n' +
        '     "username:test AND repository:test*"\n'
    )


def not_mapped_error(repo_name):
    flash(_('%s repository is not mapped to db perhaps'
            ' it was created or renamed from the filesystem'
            ' please run the application again'
            ' in order to rescan repositories') % repo_name, category='error')


def ip_range(ip_addr):
    from rhodecode.model.db import UserIpMap
    s, e = UserIpMap._get_ip_range(ip_addr)
    return '%s - %s' % (s, e)


def form(url, method='post', needs_csrf_token=True, **attrs):
    """Wrapper around webhelpers.tags.form to prevent CSRF attacks."""
    if method.lower() != 'get' and needs_csrf_token:
        raise Exception(
            'Forms to POST/PUT/DELETE endpoints should have (in general) a ' +
            'CSRF token. If the endpoint does not require such token you can ' +
            'explicitly set the parameter needs_csrf_token to false.')

    return wh_form(url, method=method, **attrs)


def secure_form(url, method="POST", multipart=False, **attrs):
    """Start a form tag that points the action to an url. This
    form tag will also include the hidden field containing
    the auth token.

    The url options should be given either as a string, or as a
    ``url()`` function. The method for the form defaults to POST.

    Options:

    ``multipart``
        If set to True, the enctype is set to "multipart/form-data".
    ``method``
        The method to use when submitting the form, usually either
        "GET" or "POST". If "PUT", "DELETE", or another verb is used, a
        hidden input with name _method is added to simulate the verb
        over POST.

    """
    from webhelpers.pylonslib.secure_form import insecure_form
    from rhodecode.lib.auth import get_csrf_token, csrf_token_key
    form = insecure_form(url, method, multipart, **attrs)
    token = HTML.div(hidden(csrf_token_key, get_csrf_token()), style="display: none;")
    return literal("%s\n%s" % (form, token))

def dropdownmenu(name, selected, options, enable_filter=False, **attrs):
    select_html = select(name, selected, options, **attrs)
    select2 = """
        <script>
            $(document).ready(function() {
                  $('#%s').select2({
                      containerCssClass: 'drop-menu',
                      dropdownCssClass: 'drop-menu-dropdown',
                      dropdownAutoWidth: true%s
                  });
            });
        </script>
    """
    filter_option = """,
                        minimumResultsForSearch: -1
    """
    input_id = attrs.get('id') or name
    filter_enabled = "" if enable_filter else filter_option
    select_script = literal(select2 % (input_id, filter_enabled))

    return literal(select_html+select_script)


def get_visual_attr(tmpl_context_var, attr_name):
    """
    A safe way to get a variable from visual variable of template context

    :param tmpl_context_var: instance of tmpl_context, usually present as `c`
    :param attr_name: name of the attribute we fetch from the c.visual
    """
    visual = getattr(tmpl_context_var, 'visual', None)
    if not visual:
        return
    else:
        return getattr(visual, attr_name, None)


def get_last_path_part(file_node):
    if not file_node.path:
        return u''

    path = safe_unicode(file_node.path.split('/')[-1])
    return u'../' + path


def route_path(*args, **kwds):
    """
    Wrapper around pyramids `route_path` function. It is used to generate
    URLs from within pylons views or templates. This will be removed when
    pyramid migration if finished.
    """
    req = get_current_request()
    return req.route_path(*args, **kwds)


def resource_path(*args, **kwds):
    """
    Wrapper around pyramids `route_path` function. It is used to generate
    URLs from within pylons views or templates. This will be removed when
    pyramid migration if finished.
    """
    req = get_current_request()
    return req.resource_path(*args, **kwds)