Added font synchronizer configuration

Allows folks to disable the synchronizer in case folks don't want or don't need this functionality.

Milestone: minor

app/jobs/synchronizers/font.rb

@@ -6,11 +6,15 @@ module Terminus
     module Synchronizers
       # Synchronizes TRMNL Framework fonts for local use.
       class Font < Base
-        include Deps["aspects.fonts.synchronizer"]
+        include Deps[:settings, "aspects.fonts.synchronizer"]
 
         sidekiq_options queue: "within_1_minute"
 
-        def perform = synchronizer.call
+        def perform
+          return synchronizer.call if settings.font_synchronizer
+
+          logger.info { "Font synchronization is disabled." }
+        end
       end
     end
   end

config/settings.rb

@@ -23,6 +23,7 @@ module Terminus
             constructor: Types::Params::String,
             default: `git tag --list --sort=taggerdate | tail -n 1`.strip
     setting :firmware_synchronizer, constructor: Types::Params::Bool, default: true
+    setting :font_synchronizer, constructor: Types::Params::Bool, default: true
     setting :http_timeout_connect,
             constructor: Types::Params::Integer.constrained(gt: 0),
             default: 2

doc/configuration.adoc

@@ -36,6 +36,7 @@ There are several environment variables you can use to customize behavior by upd
 * `FERRUM_PROCESS_TIMEOUT`: Used for configuring {ferrum_link} headless browser time allowed for the browser to start. Default: `15`.
 * `FERRUM_JAVASCRIPT_ERRORS`: Used for configuring {ferrum_link} headless browser JavaScript errors. Default: `true`.
 * `FIRMWARE_SYNCHRONIZER`: Enables/disables firmware synchronization. See {doc_jobs_link} for details. Defaults to enabled.
+* `FONT_SYNCHRONIZER`: Enables/disables firmware synchronization. See {doc_jobs_link} for details. Defaults to enabled.
 * `FONTS_PATH`: The path to where {trmnl_framework_link} fonts are stored since the Framework stylesheets require a relative path to all fonts to load properly. This is necessary when rendering screens for {doc_extensions_link}. Default: `public/fonts`.
 * `HANAMI_MAX_THREADS`: The maximum number of threads allowed for {puma_link}. Default: `5`.
 * `HANAMI_MIN_THREADS`: The minimum number of threads allowed for {puma_link}. Default: `HANAMI_MAX_THREADS`.

doc/jobs.adoc

@@ -8,7 +8,7 @@
 
 All background jobs are handled by the Sidekiq worker service. Most are created via the UI but a few are launched at application boot. The following jobs cache data from our {trmnl_link} server for improved performance and to keep common records in sync:
 
-* *Firmware*: Downloads the latest firmware for automatic device updates. By default, this checks for updates every six hours. In situations where your device updated to a newer Firmware version and it was a bad/broken version, you can revert to and older version by following these steps:
+* *Firmware*: Downloads the latest firmware for automatic device updates. By default, this checks for updates every six hours. In situations where your device updated to a newer Firmware version and was a bad/broken version, you can revert to an older version by following these steps:
 ** Ensure the device you want to downgrade has firmware updates turned on (you'll also want to ensure devices you don't want to downgrade have this setting _turned off_).
 ** Visit the Firmwares page within the UI.
 ** Delete all latest versions until you only have the version you want to downgrade to listed at the top of the list.
@@ -38,10 +38,11 @@ To disable any of the synchronizers, use the following environment variables:
 
 ----
 FIRMWARE_SYNCHRONIZER=0
+FONT_SYNCHRONIZER=0
 MODEL_SYNCHRONIZER=0
 ----
 
-You are not limited to using `0`. Any falsey value would work, example: `false`, "no", etc. When any of the pollers are disabled, you'll see the following messages in your logs (where `<poller>` is replaced with the specific poller that is disabled):
+You are not limited to using `0`. Any falsey value would work, example: `false`, "no", etc. When any of the synchronizers are disabled, you'll see the following messages in your logs (where `<synchronizer>` is replaced with the specific synchronizer that is disabled):
 
 ----
 <synchronizer> synchronization disabled.

spec/app/jobs/synchronizers/font_spec.rb

@@ -7,10 +7,26 @@ RSpec.describe Terminus::Jobs::Synchronizers::Font do
 
   let(:synchronizer) { instance_spy Terminus::Aspects::Fonts::Synchronizer }
 
+  include_context "with application dependencies"
+
   describe "#perform" do
-    it "calls synchronizer" do
+    it "calls synchronizer when enabled" do
       job.perform
       expect(synchronizer).to have_received(:call)
     end
+
+    context "when disabled" do
+      before { allow(settings).to receive(:font_synchronizer).and_return false }
+
+      it "doesn't call synchronizer" do
+        job.perform
+        expect(synchronizer).not_to have_received(:call)
+      end
+
+      it "logs information" do
+        job.perform
+        expect(logger.reread).to match(/INFO.+Font synchronization is disabled\./)
+      end
+    end
   end
 end