path: root/src/buildstream/_frontend/widget.py

#
#  Copyright (C) 2017 Codethink Limited
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public
#  License as published by the Free Software Foundation; either
#  version 2 of the License, or (at your option) any later version.
#
#  This library 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
#  Lesser General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public
#  License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
#  Authors:
#        Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
import datetime
import os
from collections import defaultdict, OrderedDict
from contextlib import ExitStack
from mmap import mmap
import re
import textwrap
from ruamel import yaml
import click

from .profile import Profile
from .. import Element, Consistency, Scope
from .. import _yaml
from .. import __version__ as bst_version
from .._exceptions import ImplError
from .._message import MessageType
from ..plugin import Plugin


# These messages are printed a bit differently
ERROR_MESSAGES = [MessageType.FAIL, MessageType.ERROR, MessageType.BUG]


# Widget()
#
# Args:
#    content_profile (Profile): The profile to use for rendering content
#    format_profile (Profile): The profile to use for rendering formatting
#
# An abstract class for printing output columns in our text UI.
#
class Widget():

    def __init__(self, context, content_profile, format_profile):

        # The context
        self.context = context

        # The content profile
        self.content_profile = content_profile

        # The formatting profile
        self.format_profile = format_profile

    # render()
    #
    # Renders a string to be printed in the UI
    #
    # Args:
    #    message (Message): A message to print
    #
    # Returns:
    #    (str): The string this widget prints for the given message
    #
    def render(self, message):
        raise ImplError("{} does not implement render()".format(type(self).__name__))


# Used to add spacing between columns
class Space(Widget):

    def render(self, message):
        return ' '


# Used to add fixed text between columns
class FixedText(Widget):

    def __init__(self, context, text, content_profile, format_profile):
        super(FixedText, self).__init__(context, content_profile, format_profile)
        self.text = text

    def render(self, message):
        return self.format_profile.fmt(self.text)


# Used to add the wallclock time this message was created at
class WallclockTime(Widget):
    def __init__(self, context, content_profile, format_profile, output_format=False):
        self._output_format = output_format
        super(WallclockTime, self).__init__(context, content_profile, format_profile)

    def render(self, message):

        fields = [self.content_profile.fmt("{:02d}".format(x)) for x in
                  [message.creation_time.hour,
                   message.creation_time.minute,
                   message.creation_time.second,
                   ]
                  ]
        text = self.format_profile.fmt(":").join(fields)

        if self._output_format == 'us':
            text += self.content_profile.fmt(".{:06d}".format(message.creation_time.microsecond))

        return text


# A widget for rendering the debugging column
class Debug(Widget):

    def render(self, message):
        unique_id = 0 if message.unique_id is None else message.unique_id

        text = self.format_profile.fmt('pid:')
        text += self.content_profile.fmt("{: <5}".format(message.pid))
        text += self.format_profile.fmt(" id:")
        text += self.content_profile.fmt("{:0>3}".format(unique_id))

        return text


# A widget for rendering the time codes
class TimeCode(Widget):
    def __init__(self, context, content_profile, format_profile, microseconds=False):
        self._microseconds = microseconds
        super(TimeCode, self).__init__(context, content_profile, format_profile)

    def render(self, message):
        return self.render_time(message.elapsed)

    def render_time(self, elapsed):
        if elapsed is None:
            fields = [
                self.content_profile.fmt('--')
                for i in range(3)
            ]
        else:
            hours, remainder = divmod(int(elapsed.total_seconds()), 60 * 60)
            minutes, seconds = divmod(remainder, 60)
            fields = [
                self.content_profile.fmt("{0:02d}".format(field))
                for field in [hours, minutes, seconds]
            ]

        text = self.format_profile.fmt(':').join(fields)

        if self._microseconds:
            if elapsed is not None:
                text += self.content_profile.fmt(".{0:06d}".format(elapsed.microseconds))
            else:
                text += self.content_profile.fmt(".------")
        return text


# A widget for rendering the MessageType
class TypeName(Widget):

    _action_colors = {
        MessageType.DEBUG: "cyan",
        MessageType.STATUS: "cyan",
        MessageType.INFO: "magenta",
        MessageType.WARN: "yellow",
        MessageType.START: "blue",
        MessageType.SUCCESS: "green",
        MessageType.FAIL: "red",
        MessageType.SKIPPED: "yellow",
        MessageType.ERROR: "red",
        MessageType.BUG: "red",
    }

    def render(self, message):
        return self.content_profile.fmt("{: <7}"
                                        .format(message.message_type.upper()),
                                        bold=True, dim=True,
                                        fg=self._action_colors[message.message_type])


# A widget for displaying the Element name
class ElementName(Widget):

    def render(self, message):
        action_name = message.action_name
        element_id = message.task_id or message.unique_id
        if element_id is not None:
            plugin = Plugin._lookup(element_id)
            name = plugin._get_full_name()
            name = '{: <30}'.format(name)
        else:
            name = 'core activity'
            name = '{: <30}'.format(name)

        if not action_name:
            action_name = "Main"

        return self.content_profile.fmt("{: >8}".format(action_name.lower())) + \
            self.format_profile.fmt(':') + self.content_profile.fmt(name)


# A widget for displaying the primary message text
class MessageText(Widget):

    def render(self, message):
        return message.message


# A widget for formatting the element cache key
class CacheKey(Widget):

    def __init__(self, context, content_profile, format_profile, err_profile):
        super(CacheKey, self).__init__(context, content_profile, format_profile)

        self._err_profile = err_profile
        self._key_length = context.log_key_length

    def render(self, message):

        element_id = message.task_id or message.unique_id
        if not self._key_length:
            return ""

        if element_id is None:
            return ' ' * self._key_length

        missing = False
        key = ' ' * self._key_length
        plugin = Plugin._lookup(element_id)
        if isinstance(plugin, Element):
            _, key, missing = plugin._get_display_key()

        if message.message_type in ERROR_MESSAGES:
            text = self._err_profile.fmt(key)
        else:
            text = self.content_profile.fmt(key, dim=missing)

        return text


# A widget for formatting the log file
class LogFile(Widget):

    def __init__(self, context, content_profile, format_profile, err_profile):
        super(LogFile, self).__init__(context, content_profile, format_profile)

        self._err_profile = err_profile
        self._logdir = context.logdir

    def render(self, message, abbrev=True):

        if message.logfile and message.scheduler:
            logfile = message.logfile

            if abbrev and self._logdir != "" and logfile.startswith(self._logdir):
                logfile = logfile[len(self._logdir):]
                logfile = logfile.lstrip(os.sep)

            if message.message_type in ERROR_MESSAGES:
                text = self._err_profile.fmt(logfile)
            else:
                text = self.content_profile.fmt(logfile, dim=True)
        else:
            text = ''

        return text


# START and SUCCESS messages are expected to have no useful
# information in the message text, so we display the logfile name for
# these messages, and the message text for other types.
#
class MessageOrLogFile(Widget):
    def __init__(self, context, content_profile, format_profile, err_profile):
        super(MessageOrLogFile, self).__init__(context, content_profile, format_profile)
        self._message_widget = MessageText(context, content_profile, format_profile)
        self._logfile_widget = LogFile(context, content_profile, format_profile, err_profile)

    def render(self, message):
        # Show the log file only in the main start/success messages
        if message.logfile and message.scheduler and \
           message.message_type in [MessageType.START, MessageType.SUCCESS]:
            text = self._logfile_widget.render(message)
        else:
            text = self._message_widget.render(message)
        return text


# LogLine
#
# A widget for formatting a log line
#
# Args:
#    context (Context): The Context
#    content_profile (Profile): Formatting profile for content text
#    format_profile (Profile): Formatting profile for formatting text
#    success_profile (Profile): Formatting profile for success text
#    error_profile (Profile): Formatting profile for error text
#    detail_profile (Profile): Formatting profile for detail text
#    indent (int): Number of spaces to use for general indentation
#
class LogLine(Widget):

    def __init__(self, context,
                 content_profile,
                 format_profile,
                 success_profile,
                 err_profile,
                 detail_profile,
                 indent=4):
        super(LogLine, self).__init__(context, content_profile, format_profile)

        self._columns = []
        self._failure_messages = defaultdict(list)
        self._success_profile = success_profile
        self._err_profile = err_profile
        self._detail_profile = detail_profile
        self._indent = ' ' * indent
        self._log_lines = context.log_error_lines
        self._message_lines = context.log_message_lines
        self._resolved_keys = None

        self._space_widget = Space(context, content_profile, format_profile)
        self._logfile_widget = LogFile(context, content_profile, format_profile, err_profile)

        if context.log_debug:
            self._columns.extend([
                Debug(context, content_profile, format_profile)
            ])

        self.logfile_variable_names = {
            "elapsed": TimeCode(context, content_profile, format_profile, microseconds=False),
            "elapsed-us": TimeCode(context, content_profile, format_profile, microseconds=True),
            "wallclock": WallclockTime(context, content_profile, format_profile),
            "wallclock-us": WallclockTime(context, content_profile, format_profile, output_format='us'),
            "key": CacheKey(context, content_profile, format_profile, err_profile),
            "element": ElementName(context, content_profile, format_profile),
            "action": TypeName(context, content_profile, format_profile),
            "message": MessageOrLogFile(context, content_profile, format_profile, err_profile)
        }
        logfile_tokens = self._parse_logfile_format(context.log_message_format, content_profile, format_profile)
        self._columns.extend(logfile_tokens)

    # show_pipeline()
    #
    # Display a list of elements in the specified format.
    #
    # The formatting string is the one currently documented in `bst show`, this
    # is used in pipeline session headings and also to implement `bst show`.
    #
    # Args:
    #    dependencies (list of Element): A list of Element objects
    #    format_: A formatting string, as specified by `bst show`
    #
    # Returns:
    #    (str): The formatted list of elements
    #
    def show_pipeline(self, dependencies, format_):
        report = ''
        p = Profile()

        for element in dependencies:
            line = format_

            full_key, cache_key, dim_keys = element._get_display_key()

            line = p.fmt_subst(line, 'name', element._get_full_name(), fg='blue', bold=True)
            line = p.fmt_subst(line, 'key', cache_key, fg='yellow', dim=dim_keys)
            line = p.fmt_subst(line, 'full-key', full_key, fg='yellow', dim=dim_keys)

            consistency = element._get_consistency()
            if consistency == Consistency.INCONSISTENT:
                line = p.fmt_subst(line, 'state', "no reference", fg='red')
            else:
                if element._cached_failure():
                    line = p.fmt_subst(line, 'state', "failed", fg='red')
                elif element._cached_success():
                    line = p.fmt_subst(line, 'state', "cached", fg='magenta')
                elif consistency == Consistency.RESOLVED and not element._source_cached():
                    line = p.fmt_subst(line, 'state', "fetch needed", fg='red')
                elif element._buildable():
                    line = p.fmt_subst(line, 'state', "buildable", fg='green')
                else:
                    line = p.fmt_subst(line, 'state', "waiting", fg='blue')

            # Element configuration
            if "%{config" in format_:
                config = _yaml.node_sanitize(element._Element__config)
                line = p.fmt_subst(
                    line, 'config',
                    yaml.round_trip_dump(config, default_flow_style=False, allow_unicode=True))

            # Variables
            if "%{vars" in format_:
                variables = _yaml.node_sanitize(element._Element__variables.flat)
                line = p.fmt_subst(
                    line, 'vars',
                    yaml.round_trip_dump(variables, default_flow_style=False, allow_unicode=True))

            # Environment
            if "%{env" in format_:
                environment = _yaml.node_sanitize(element._Element__environment)
                line = p.fmt_subst(
                    line, 'env',
                    yaml.round_trip_dump(environment, default_flow_style=False, allow_unicode=True))

            # Public
            if "%{public" in format_:
                environment = _yaml.node_sanitize(element._Element__public)
                line = p.fmt_subst(
                    line, 'public',
                    yaml.round_trip_dump(environment, default_flow_style=False, allow_unicode=True))

            # Workspaced
            if "%{workspaced" in format_:
                line = p.fmt_subst(
                    line, 'workspaced',
                    '(workspaced)' if element._get_workspace() else '', fg='yellow')

            # Workspace-dirs
            if "%{workspace-dirs" in format_:
                workspace = element._get_workspace()
                if workspace is not None:
                    path = workspace.get_absolute_path()
                    if path.startswith("~/"):
                        path = os.path.join(os.getenv('HOME', '/root'), path[2:])
                    line = p.fmt_subst(line, 'workspace-dirs', "Workspace: {}".format(path))
                else:
                    line = p.fmt_subst(
                        line, 'workspace-dirs', '')

            # Dependencies
            if "%{deps" in format_:
                deps = [e.name for e in element.dependencies(Scope.ALL, recurse=False)]
                line = p.fmt_subst(
                    line, 'deps',
                    yaml.safe_dump(deps, default_style=None).rstrip('\n'))

            # Build Dependencies
            if "%{build-deps" in format_:
                build_deps = [e.name for e in element.dependencies(Scope.BUILD, recurse=False)]
                line = p.fmt_subst(
                    line, 'build-deps',
                    yaml.safe_dump(build_deps, default_style=False).rstrip('\n'))

            # Runtime Dependencies
            if "%{runtime-deps" in format_:
                runtime_deps = [e.name for e in element.dependencies(Scope.RUN, recurse=False)]
                line = p.fmt_subst(
                    line, 'runtime-deps',
                    yaml.safe_dump(runtime_deps, default_style=False).rstrip('\n'))

            report += line + '\n'

        return report.rstrip('\n')

    # print_heading()
    #
    # A message to be printed at program startup, indicating
    # some things about user configuration and BuildStream version
    # and so on.
    #
    # Args:
    #    project (Project): The toplevel project we were invoked from
    #    stream (Stream): The stream
    #    log_file (file): An optional file handle for additional logging
    #    styling (bool): Whether to enable ansi escape codes in the output
    #
    def print_heading(self, project, stream, *, log_file, styling=False):
        context = self.context
        starttime = datetime.datetime.now()
        text = ''

        self._resolved_keys = {element: element._get_cache_key() for element in stream.session_elements}

        # Main invocation context
        text += '\n'
        text += self.content_profile.fmt("BuildStream Version {}\n".format(bst_version), bold=True)
        values = OrderedDict()
        values["Session Start"] = starttime.strftime('%A, %d-%m-%Y at %H:%M:%S')
        values["Project"] = "{} ({})".format(project.name, project.directory)
        values["Targets"] = ", ".join([t.name for t in stream.targets])
        values["Cache Usage"] = str(context.get_cache_usage())
        text += self._format_values(values)

        # User configurations
        text += '\n'
        text += self.content_profile.fmt("User Configuration\n", bold=True)
        values = OrderedDict()
        values["Configuration File"] = \
            "Default Configuration" if not context.config_origin else context.config_origin
        values["Cache Directory"] = context.cachedir
        values["Log Files"] = context.logdir
        values["Source Mirrors"] = context.sourcedir
        values["Build Area"] = context.builddir
        values["Strict Build Plan"] = "Yes" if context.get_strict() else "No"
        values["Maximum Fetch Tasks"] = context.sched_fetchers
        values["Maximum Build Tasks"] = context.sched_builders
        values["Maximum Push Tasks"] = context.sched_pushers
        values["Maximum Network Retries"] = context.sched_network_retries
        text += self._format_values(values)
        text += '\n'

        # Project Options
        values = OrderedDict()
        project.options.printable_variables(values)
        if values:
            text += self.content_profile.fmt("Project Options\n", bold=True)
            text += self._format_values(values)
            text += '\n'

        # Plugins
        text += self._format_plugins(project.first_pass_config.element_factory.loaded_dependencies,
                                     project.first_pass_config.source_factory.loaded_dependencies)
        if project.config.element_factory and project.config.source_factory:
            text += self._format_plugins(project.config.element_factory.loaded_dependencies,
                                         project.config.source_factory.loaded_dependencies)

        # Pipeline state
        text += self.content_profile.fmt("Pipeline\n", bold=True)
        text += self.show_pipeline(stream.total_elements, context.log_element_format)
        text += '\n'

        # Separator line before following output
        text += self.format_profile.fmt("=" * 79 + '\n')

        click.echo(text, color=styling, nl=False, err=True)
        if log_file:
            click.echo(text, file=log_file, color=False, nl=False)

    # print_summary()
    #
    # Print a summary of activities at the end of a session
    #
    # Args:
    #    stream (Stream): The Stream
    #    log_file (file): An optional file handle for additional logging
    #    styling (bool): Whether to enable ansi escape codes in the output
    #
    def print_summary(self, stream, log_file, styling=False):

        # Early silent return if there are no queues, can happen
        # only in the case that the stream early returned due to
        # an inconsistent pipeline state.
        if not stream.queues:
            return

        text = ''

        assert self._resolved_keys is not None
        elements = sorted(e for (e, k) in self._resolved_keys.items() if k != e._get_cache_key())
        if elements:
            text += self.content_profile.fmt("Resolved key Summary\n", bold=True)
            text += self.show_pipeline(elements, self.context.log_element_format)
            text += "\n\n"

        if self._failure_messages:
            values = OrderedDict()

            for element, messages in sorted(self._failure_messages.items(), key=lambda x: x[0].name):
                for queue in stream.queues:
                    if any(el.name == element.name for el in queue.failed_elements):
                        values[element.name] = ''.join(self._render(v) for v in messages)
            if values:
                text += self.content_profile.fmt("Failure Summary\n", bold=True)
                text += self._format_values(values, style_value=False)

        text += self.content_profile.fmt("Pipeline Summary\n", bold=True)
        values = OrderedDict()

        values['Total'] = self.content_profile.fmt(str(len(stream.total_elements)))
        values['Session'] = self.content_profile.fmt(str(len(stream.session_elements)))

        processed_maxlen = 1
        skipped_maxlen = 1
        failed_maxlen = 1
        for queue in stream.queues:
            processed_maxlen = max(len(str(len(queue.processed_elements))), processed_maxlen)
            skipped_maxlen = max(len(str(len(queue.skipped_elements))), skipped_maxlen)
            failed_maxlen = max(len(str(len(queue.failed_elements))), failed_maxlen)

        for queue in stream.queues:
            processed = str(len(queue.processed_elements))
            skipped = str(len(queue.skipped_elements))
            failed = str(len(queue.failed_elements))

            processed_align = ' ' * (processed_maxlen - len(processed))
            skipped_align = ' ' * (skipped_maxlen - len(skipped))
            failed_align = ' ' * (failed_maxlen - len(failed))

            status_text = self.content_profile.fmt("processed ") + \
                self._success_profile.fmt(processed) + \
                self.format_profile.fmt(', ') + processed_align

            status_text += self.content_profile.fmt("skipped ") + \
                self.content_profile.fmt(skipped) + \
                self.format_profile.fmt(', ') + skipped_align

            status_text += self.content_profile.fmt("failed ") + \
                self._err_profile.fmt(failed) + ' ' + failed_align
            values["{} Queue".format(queue.action_name)] = status_text

        text += self._format_values(values, style_value=False)

        click.echo(text, color=styling, nl=False, err=True)
        if log_file:
            click.echo(text, file=log_file, color=False, nl=False)

    ###################################################
    #             Widget Abstract Methods             #
    ###################################################

    def render(self, message):

        # Track logfiles for later use
        element_id = message.task_id or message.unique_id
        if message.message_type in ERROR_MESSAGES and element_id is not None:
            plugin = Plugin._lookup(element_id)
            self._failure_messages[plugin].append(message)

        return self._render(message)

    ###################################################
    #                 Private Methods                 #
    ###################################################
    def _parse_logfile_format(self, format_string, content_profile, format_profile):
        logfile_tokens = []
        while format_string:
            if format_string.startswith("%%"):
                logfile_tokens.append(FixedText(self.context, "%", content_profile, format_profile))
                format_string = format_string[2:]
                continue
            m = re.search(r"^%\{([^\}]+)\}", format_string)
            if m is not None:
                variable = m.group(1)
                format_string = format_string[m.end(0):]
                if variable not in self.logfile_variable_names:
                    raise Exception("'{0}' is not a valid log variable name.".format(variable))
                logfile_tokens.append(self.logfile_variable_names[variable])
            else:
                m = re.search("^[^%]+", format_string)
                if m is not None:
                    text = FixedText(self.context, m.group(0), content_profile, format_profile)
                    format_string = format_string[m.end(0):]
                    logfile_tokens.append(text)
                else:
                    # No idea what to do now
                    raise Exception("'{0}' could not be parsed into a valid logging format.".format(format_string))
        return logfile_tokens

    def _render(self, message):

        # Render the column widgets first
        text = ''
        for widget in self._columns:
            text += widget.render(message)

        text += '\n'

        extra_nl = False

        # Now add some custom things
        if message.detail:

            # Identify frontend messages, we never abbreviate these
            frontend_message = not (message.task_id or message.unique_id)

            # Split and truncate message detail down to message_lines lines
            lines = message.detail.splitlines(True)

            n_lines = len(lines)
            abbrev = False
            if message.message_type not in ERROR_MESSAGES \
               and not frontend_message and n_lines > self._message_lines:
                lines = lines[0:self._message_lines]
                if self._message_lines > 0:
                    abbrev = True
            else:
                lines[n_lines - 1] = lines[n_lines - 1].rstrip('\n')

            detail = self._indent + self._indent.join(lines)

            text += '\n'
            if message.message_type in ERROR_MESSAGES:
                text += self._err_profile.fmt(detail, bold=True)
            else:
                text += self._detail_profile.fmt(detail)

            if abbrev:
                text += self._indent + \
                    self.content_profile.fmt('Message contains {} additional lines'
                                             .format(n_lines - self._message_lines), dim=True)
            text += '\n'

            extra_nl = True

        if message.scheduler and message.message_type == MessageType.FAIL:
            text += '\n'

            if self.context is not None and not self.context.log_verbose:
                text += self._indent + self._err_profile.fmt("Log file: ")
                text += self._indent + self._logfile_widget.render(message) + '\n'
            elif self._log_lines > 0:
                text += self._indent + self._err_profile.fmt("Printing the last {} lines from log file:"
                                                             .format(self._log_lines)) + '\n'
                text += self._indent + self._logfile_widget.render(message, abbrev=False) + '\n'
                text += self._indent + self._err_profile.fmt("=" * 70) + '\n'

                log_content = self._read_last_lines(message.logfile)
                log_content = textwrap.indent(log_content, self._indent)
                text += self._detail_profile.fmt(log_content)
                text += '\n'
                text += self._indent + self._err_profile.fmt("=" * 70) + '\n'
            extra_nl = True

        if extra_nl:
            text += '\n'

        return text

    def _read_last_lines(self, logfile):
        with ExitStack() as stack:
            # mmap handles low-level memory details, allowing for
            # faster searches
            f = stack.enter_context(open(logfile, 'r+'))
            log = stack.enter_context(mmap(f.fileno(), os.path.getsize(f.name)))

            count = 0
            end = log.size() - 1

            while count < self._log_lines and end >= 0:
                location = log.rfind(b'\n', 0, end)
                count += 1

                # If location is -1 (none found), this will print the
                # first character because of the later +1
                end = location

            # end+1 is correct whether or not a newline was found at
            # that location. If end is -1 (seek before beginning of file)
            # then we get the first characther. If end is a newline position,
            # we discard it and only want to print the beginning of the next
            # line.
            lines = log[(end + 1):].splitlines()
            return '\n'.join([line.decode('utf-8') for line in lines]).rstrip()

    def _format_plugins(self, element_plugins, source_plugins):
        text = ""

        if not (element_plugins or source_plugins):
            return text

        text += self.content_profile.fmt("Loaded Plugins\n", bold=True)

        if element_plugins:
            text += self.format_profile.fmt("  Element Plugins\n")
            for plugin in element_plugins:
                text += self.content_profile.fmt("    - {}\n".format(plugin))

        if source_plugins:
            text += self.format_profile.fmt("  Source Plugins\n")
            for plugin in source_plugins:
                text += self.content_profile.fmt("    - {}\n".format(plugin))

        text += '\n'

        return text

    # _format_values()
    #
    # Formats an indented dictionary of titles / values, ensuring
    # the values are aligned.
    #
    # Args:
    #    values: A dictionary, usually an OrderedDict()
    #    style_value: Whether to use the content profile for the values
    #
    # Returns:
    #    (str): The formatted values
    #
    def _format_values(self, values, style_value=True):
        text = ''
        max_key_len = 0
        for key, value in values.items():
            max_key_len = max(len(key), max_key_len)

        for key, value in values.items():
            if isinstance(value, str) and '\n' in value:
                text += self.format_profile.fmt("  {}:\n".format(key))
                text += textwrap.indent(value, self._indent)
                continue

            text += self.format_profile.fmt("  {}: {}".format(key, ' ' * (max_key_len - len(key))))
            if style_value:
                text += self.content_profile.fmt(str(value))
            else:
                text += str(value)
            text += '\n'

        return text