Add option to not consider word boundaries when processing keyword filtering (#7975)

* Add option to not consider word boundaries when filtering phrases

* Add a few tests for keyword/phrase filtering

db/migrate/20180707154237_add_whole_word_to_custom_filter.rb

@@ -0,0 +1,17 @@
+require Rails.root.join('lib', 'mastodon', 'migration_helpers')
+
+class AddWholeWordToCustomFilter < ActiveRecord::Migration[5.2]
+  include Mastodon::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def change
+    safety_assured do
+      add_column_with_default :custom_filters, :whole_word, :boolean, default: true, allow_null: false
+    end
+  end
+
+  def down
+    remove_column :custom_filters, :whole_word
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_06_28_181026) do
+ActiveRecord::Schema.define(version: 2018_07_07_154237) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -149,6 +149,7 @@ ActiveRecord::Schema.define(version: 2018_06_28_181026) do
     t.text "phrase", default: "", null: false
     t.string "context", default: [], null: false, array: true
     t.boolean "irreversible", default: false, null: false
+    t.boolean "whole_word", default: true, null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["account_id"], name: "index_custom_filters_on_account_id"