'Start/Stop tracking' on issues#show

app/controllers/stopwatch_issue_timers_controller.rb

@@ -0,0 +1,48 @@
+class StopwatchIssueTimersController < StopwatchController
+  before_action :find_issue
+  before_action :authorize_log_time
+
+  def start
+    t = Stopwatch::IssueTimer.new(issue: @issue)
+    if t.running?
+      head 422; return
+    end
+
+    time_entry = User.current.todays_time_entry_for(@issue)
+    if time_entry.new_record?
+      sys_default_activity = time_entry.activity
+      time_entry.activity = Stopwatch.default_activity_for time_entry
+    end
+
+    r = Stopwatch::StartTimer.new(time_entry).call
+    if r.success?
+      @started_time_entry = time_entry
+      render status: :created
+    else
+      @time_entry = time_entry
+      # in case the setting is 'always ask', still preset the form to the global default
+      @time_entry.activity ||= sys_default_activity
+      @time_entry.errors.clear
+      render status: :ok
+    end
+  end
+
+  def stop
+    r = Stopwatch::StopTimer.new.call
+    unless r.success?
+      logger.error "unable to stop timer"
+      head 422; return
+    end
+  end
+
+  private
+
+  def authorize_log_time
+    User.current.allowed_to?(:log_time, @project) or deny_access
+  end
+
+  def find_issue
+    @issue = Issue.find params[:issue_id]
+    @project = @issue.project
+  end
+end