DEV: Enable unless cops

We discussed the use of `unless` internally and decided to enforce
available rules from rubocop to restrict its most problematic uses.

script/import_scripts/base.rb

@@ -116,7 +116,7 @@ class ImportScripts::Base
   def reset_site_settings
     @old_site_settings.each do |key, value|
       current_value = SiteSetting.get(key)
-      SiteSetting.set(key, value) unless current_value != @site_settings_during_import[key]
+      SiteSetting.set(key, value) if current_value == @site_settings_during_import[key]
     end
 
     RateLimiter.enable

script/import_scripts/bespoke_1.rb

@@ -178,11 +178,7 @@ class ImportScripts::Bespoke < ImportScripts::Base
 
       topic = topics[post[:topic_id]]
 
-      unless topic[:post_id]
-        mapped[:category] = category_id_from_imported_category_id(topic[:category_id])
-        mapped[:title] = post[:title]
-        topic[:post_id] = post[:id]
-      else
+      if topic[:post_id]
         parent = topic_lookup_from_imported_post_id(topic[:post_id])
         next unless parent
 
@@ -195,6 +191,10 @@ class ImportScripts::Bespoke < ImportScripts::Base
             mapped[:reply_to_post_number] = reply_to_post_number
           end
         end
+      else
+        mapped[:category] = category_id_from_imported_category_id(topic[:category_id])
+        mapped[:title] = post[:title]
+        topic[:post_id] = post[:id]
       end
 
       next if topic[:deleted] || post[:deleted]

script/import_scripts/discuz_x.rb

@@ -887,7 +887,7 @@ class ImportScripts::DiscuzX < ImportScripts::Base
                               LIMIT 1",
         )
 
-      return discuzx_link unless results.size > 0
+      return discuzx_link if results.size.zero?
 
       linked_post_id = results.first["pid"]
       lookup = topic_lookup_from_imported_post_id(linked_post_id)

script/import_scripts/jive.rb

@@ -225,11 +225,7 @@ class ImportScripts::Jive < ImportScripts::Base
         next
       end
 
-      unless topic[:post_id]
-        mapped[:category] = category_id_from_imported_category_id(topic[:category_id])
-        mapped[:title] = post[:title]
-        topic[:post_id] = post[:id]
-      else
+      if topic[:post_id]
         parent = topic_lookup_from_imported_post_id(topic[:post_id])
         next unless parent
 
@@ -242,6 +238,10 @@ class ImportScripts::Jive < ImportScripts::Base
             mapped[:reply_to_post_number] = reply_to_post_number
           end
         end
+      else
+        mapped[:category] = category_id_from_imported_category_id(topic[:category_id])
+        mapped[:title] = post[:title]
+        topic[:post_id] = post[:id]
       end
 
       next if topic[:deleted] || post[:deleted]

script/import_scripts/kunena.rb

@@ -95,7 +95,7 @@ class ImportScripts::Kunena < ImportScripts::Base
         cache_rows: false,
       )
     results.each do |u|
-      next unless u["userid"].to_i > 0
+      next if u["userid"].to_i <= 0
       user = @users[u["userid"].to_i]
       if user
         user[:bio] = u["signature"]

script/import_scripts/kunena3.rb

@@ -114,7 +114,7 @@ class ImportScripts::Kunena < ImportScripts::Base
         cache_rows: false,
       )
     results.each do |u|
-      next unless u["userid"].to_i > 0
+      next if u["userid"].to_i <= 0
       user = @users[u["userid"].to_i]
       if user
         user[:bio] = u["signature"]

script/import_scripts/lithium.rb

@@ -803,12 +803,12 @@ class ImportScripts::Lithium < ImportScripts::Base
             import_mode: true,
           }
 
-          unless topic_id
+          if topic_id
+            msg[:topic_id] = topic_id
+          else
             msg[:title] = @htmlentities.decode(topic["subject"]).strip[0...255]
             msg[:archetype] = Archetype.private_message
             msg[:target_usernames] = usernames.join(",")
-          else
-            msg[:topic_id] = topic_id
           end
 
           msg

script/import_scripts/modx.rb

@@ -382,7 +382,9 @@ FROM #{TABLE_PREFIX}discuss_users
           title_username_of_pm_first_post[[title, participants]] ||= m["pmtextid"]
         end
 
-        unless topic_id
+        if topic_id
+          mapped[:topic_id] = topic_id
+        else
           mapped[:title] = title
           mapped[:archetype] = Archetype.private_message
           mapped[:target_usernames] = target_usernames.join(",")
@@ -392,8 +394,6 @@ FROM #{TABLE_PREFIX}discuss_users
             mapped[:target_usernames] = "system"
             puts "pm-#{m["pmtextid"]} has no target (#{m["touserarray"]})"
           end
-        else
-          mapped[:topic_id] = topic_id
         end
 
         skip ? nil : mapped

script/import_scripts/smf2.rb

@@ -378,7 +378,7 @@ class ImportScripts::Smf2 < ImportScripts::Base
       AttachmentPatterns.each do |p|
         pattern, emitter = *p
         body.gsub!(pattern) do |s|
-          next s unless (num = $~[:num].to_i - 1) >= 0
+          next s if (num = $~[:num].to_i - 1) < 0
           next s unless (upload = attachments[num]).present?
           use_count[num] += 1
           instance_exec(upload, &emitter)

script/import_scripts/vbulletin.rb

@@ -586,7 +586,9 @@ class ImportScripts::VBulletin < ImportScripts::Base
           title_username_of_pm_first_post[[title, participants]] ||= m["pmtextid"]
         end
 
-        unless topic_id
+        if topic_id
+          mapped[:topic_id] = topic_id
+        else
           mapped[:title] = title
           mapped[:archetype] = Archetype.private_message
           mapped[:target_usernames] = target_usernames.join(",")
@@ -596,8 +598,6 @@ class ImportScripts::VBulletin < ImportScripts::Base
             mapped[:target_usernames] = "system"
             puts "pm-#{m["pmtextid"]} has no target (#{m["touserarray"]})"
           end
-        else
-          mapped[:topic_id] = topic_id
         end
 
         skip ? nil : mapped

script/import_scripts/xenforo.rb

@@ -335,7 +335,15 @@ class ImportScripts::XenForo < ImportScripts::Base
             created_at: Time.zone.at(post["message_date"].to_i),
             import_mode: true,
           }
-          unless post["topic_id"] > 0
+          if post["topic_id"] <= 0
+            topic_id = post["topic_id"]
+            if t = topic_lookup_from_imported_post_id("pm_#{topic_id}")
+              msg[:topic_id] = t[:topic_id]
+            else
+              puts "Topic ID #{topic_id} not found, skipping post #{post["message_id"]} from #{post["user_id"]}"
+              next
+            end
+          else
             msg[:title] = post["title"]
             msg[:archetype] = Archetype.private_message
             to_user_array = PHP.unserialize(post["recipients"])
@@ -344,14 +352,6 @@ class ImportScripts::XenForo < ImportScripts::Base
               usernames = User.where(id: [discourse_user_ids]).pluck(:username)
               msg[:target_usernames] = usernames.join(",")
             end
-          else
-            topic_id = post["topic_id"]
-            if t = topic_lookup_from_imported_post_id("pm_#{topic_id}")
-              msg[:topic_id] = t[:topic_id]
-            else
-              puts "Topic ID #{topic_id} not found, skipping post #{post["message_id"]} from #{post["user_id"]}"
-              next
-            end
           end
           msg
         else