bigbluebutton / greenlight

# BigBlueButton open source conferencing system - http://www.bigbluebutton.org/.

#

# Copyright (c) 2018 BigBlueButton Inc. and by respective authors (see below).

#

# 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 3.0 of the License, or (at your option) any later

# version.

#

# BigBlueButton 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 BigBlueButton; if not, see <http://www.gnu.org/licenses/>.

module Themer

  extend ActiveSupport::Concern

  # Lightens a color by 40%

    # Uses the built in Sass Engine to lighten the color

    dummy_scss = "h1 { color: $lighten; }"

    compiled = Sass::Engine.new("$lighten:lighten(#{color}, 40%);" + dummy_scss, syntax: :scss).render

    string_locater = 'color: '

    color_start = compiled.index(string_locater) + string_locater.length

    compiled[color_start..color_start + 6]

  end

  # Darkens a color by 10%