discourse/app/models/color_scheme.rb

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require_dependency 'sass/discourse_stylesheets'
require_dependency 'distributed_cache'
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class ColorScheme < ActiveRecord::Base
def self.hex_cache
@hex_cache ||= DistributedCache.new("scheme_hex_for_name")
end
attr_accessor :is_base
has_many :color_scheme_colors, -> { order('id ASC') }, dependent: :destroy
alias_method :colors, :color_scheme_colors
scope :current_version, ->{ where(versioned_id: nil) }
after_destroy :destroy_versions
after_save :publish_discourse_stylesheet
after_save :dump_hex_cache
after_destroy :dump_hex_cache
validates_associated :color_scheme_colors
BASE_COLORS_FILE = "#{Rails.root}/app/assets/stylesheets/common/foundation/colors.scss"
@mutex = Mutex.new
def self.base_colors
@mutex.synchronize do
return @base_colors if @base_colors
@base_colors = {}
read_colors_file.each do |line|
matches = /\$([\w]+):\s*#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})(?:[;]|\s)/.match(line.strip)
@base_colors[matches[1]] = matches[2] if matches
end
end
@base_colors
end
def self.read_colors_file
File.readlines(BASE_COLORS_FILE)
end
def self.enabled
current_version.find_by(enabled: true)
end
def self.base
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return @base_color_scheme if @base_color_scheme
@base_color_scheme = new(name: I18n.t('color_schemes.base_theme_name'), enabled: false)
@base_color_scheme.colors = base_colors.map { |name, hex| {name: name, hex: hex} }
@base_color_scheme.is_base = true
@base_color_scheme
end
# create_from_base will create a new ColorScheme that overrides Discourse's base color scheme with the given colors.
def self.create_from_base(params)
new_color_scheme = new(name: params[:name])
colors = base.colors_hashes
# Override base values
params[:colors].each do |name, hex|
c = colors.find {|x| x[:name].to_s == name.to_s}
c[:hex] = hex
end
new_color_scheme.colors = colors
new_color_scheme.save
new_color_scheme
end
def self.hex_for_name(name)
val = begin
hex_cache[name] ||= begin
# Can't use `where` here because base doesn't allow it
(enabled || base).colors.find {|c| c.name == name }.try(:hex) || :nil
end
end
val == :nil ? nil : val
end
def colors=(arr)
@colors_by_name = nil
arr.each do |c|
self.color_scheme_colors << ColorSchemeColor.new( name: c[:name], hex: c[:hex] )
end
end
def colors_by_name
@colors_by_name ||= self.colors.inject({}) { |sum,c| sum[c.name] = c; sum; }
end
def clear_colors_cache
@colors_by_name = nil
end
def colors_hashes
color_scheme_colors.map do |c|
{name: c.name, hex: c.hex}
end
end
def previous_version
ColorScheme.where(versioned_id: self.id).where('version < ?', self.version).order('version DESC').first
end
def destroy_versions
ColorScheme.where(versioned_id: self.id).destroy_all
end
def publish_discourse_stylesheet
MessageBus.publish("/discourse_stylesheet", self.name)
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DiscourseStylesheets.cache.clear
end
def dump_hex_cache
self.class.hex_cache.clear
end
end
# == Schema Information
#
# Table name: color_schemes
#
# id :integer not null, primary key
# name :string(255) not null
# enabled :boolean default(FALSE), not null
# versioned_id :integer
# version :integer default(1), not null
# created_at :datetime not null
# updated_at :datetime not null
#