use dots instead of colons for tag scopes

app/lib/bangtags.rb

@@ -36,7 +36,7 @@ class Bangtags
   end
 
   def process
-    return unless status.text&.present? && status.text.include?('#!')
+    return unless !@vars['_bangtags:disable'] && status.text&.present? && status.text.include?('#!')
 
     status.text.gsub!('#!!', "#\u200c!")
 
@@ -218,7 +218,7 @@ class Bangtags
           chunk = mentions.join(' ')
         when 'tag'
           chunk = nil
-          tags = cmd[1..-1].map {|t| t.gsub('.', ':')}
+          tags = cmd[1..-1].map {|t| t.gsub(':', '.')}
           add_tags(status, *tags)
         when 'thread'
           chunk = nil
@@ -291,7 +291,7 @@ class Bangtags
           when 'tag'
             chunk = nil
             next unless @parent_status.account.id == @account.id
-            tags = cmd[2..-1].map {|t| t.gsub('.', ':')}
+            tags = cmd[2..-1].map {|t| t.gsub(':', '.')}
             add_tags(@parent_status, *tags)
           when 'emoji'
             @parent_status.emojis.each do |theirs|
@@ -404,7 +404,7 @@ class Bangtags
           status.visibility = :direct
           @vore_stack.push('_draft')
           @component_stack.push(:var)
-          add_tags(status, 'self:draft')
+          add_tags(status, 'self.draft')
         when 'format', 'type'
           chunk = nil
           next if cmd[1].nil?

app/models/tag.rb

@@ -19,7 +19,7 @@ class Tag < ApplicationRecord
   has_many :featured_tags, dependent: :destroy, inverse_of: :tag
   has_one :account_tag_stat, dependent: :destroy
 
-  HASHTAG_NAME_RE = '[[:word:]:_\-]*[[:alpha:]:_·\-][[:word:]:_\-]*'
+  HASHTAG_NAME_RE = '[[:word:]._\-]*[[:alpha:]._·\-][[:word:]._\-]*'
   HASHTAG_RE = /(?:^|[^\/\)\w])#(#{HASHTAG_NAME_RE})/i
 
   validates :name, presence: true, uniqueness: true, format: { with: /\A#{HASHTAG_NAME_RE}\z/i }

app/services/process_hashtags_service.rb

@@ -8,9 +8,9 @@ class ProcessHashtagsService < BaseService
     records = []
 
     tags.map { |str| str.mb_chars.downcase }.uniq(&:to_s).each do |name|
-      name = name.gsub(/::+/, ':')
+      name = name.gsub(/\.\.+/, '.')
       next if name.blank?
-      component_indices = name.size.times.select {|i| name[i] == ':'}
+      component_indices = name.size.times.select {|i| name[i] == '.'}
       component_indices << name.size - 1
       component_indices.take(6).each_with_index do |i, nest|
         frag = (nest != 5) ? name[0..i] : name

db/migrate/20190521003909_rewrite_scoped_tag_delims.rb

@@ -0,0 +1,9 @@
+class RewriteScopedTagDelims < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+  def up
+    Tag.where("tags.name LIKE '%:%'").find_each do |tag|
+      tag.name.gsub!(':', '.')
+      tag.save
+    end
+  end
+end