FEATURE: new 'search_ignore_accents' site setting

app/services/search_indexer.rb

@@ -11,8 +11,8 @@ class SearchIndexer
     @disabled = false
   end
 
-  def self.scrub_html_for_search(html)
-    HtmlScrubber.scrub(html)
+  def self.scrub_html_for_search(html, strip_diacritics: SiteSetting.search_ignore_accents)
+    HtmlScrubber.scrub(html, strip_diacritics: strip_diacritics)
   end
 
   def self.inject_extra_terms(raw)
@@ -169,18 +169,10 @@ class SearchIndexer
 
     DIACRITICS ||= /([\u0300-\u036f]|[\u1AB0-\u1AFF]|[\u1DC0-\u1DFF]|[\u20D0-\u20FF])/
 
-    def self.strip_diacritics(str)
-      s = str.unicode_normalize(:nfkd)
-      s.gsub!(DIACRITICS, "")
-      s.strip!
-      s
-    end
-
     attr_reader :scrubbed
 
     def initialize(strip_diacritics: false)
       @scrubbed = +""
-      # for now we are disabling this per: https://meta.discourse.org/t/discourse-should-ignore-if-a-character-is-accented-when-doing-a-search/90198/16?u=sam
       @strip_diacritics = strip_diacritics
     end
 
@@ -189,7 +181,7 @@ class SearchIndexer
 
       me = new(strip_diacritics: strip_diacritics)
       Nokogiri::HTML::SAX::Parser.new(me).parse("<div>#{html}</div>")
-      me.scrubbed
+      me.scrubbed.squish
     end
 
     ATTRIBUTES ||= %w{alt title href data-youtube-title}
@@ -204,8 +196,15 @@ class SearchIndexer
       end
     end
 
+    def strip_diacritics(str)
+      s = str.unicode_normalize(:nfkd)
+      s.gsub!(DIACRITICS, "")
+      s.strip!
+      s
+    end
+
     def characters(str)
-      str = HtmlScrubber.strip_diacritics(str) if @strip_diacritics
+      str = strip_diacritics(str) if @strip_diacritics
       scrubbed << " #{str} "
     end
   end

config/locales/server.en.yml

@@ -1144,6 +1144,7 @@ en:
     log_search_queries: "Log search queries performed by users"
     search_query_log_max_size: "Maximum amount of search queries to keep"
     search_query_log_max_retention_days: "Maximum amount of time to keep search queries, in days."
+    search_ignore_accents: "Ignore accents when searching for text."
     allow_uncategorized_topics: "Allow topics to be created without a category. WARNING: If there are any uncategorized topics, you must recategorize them before turning this off."
     allow_duplicate_topic_titles: "Allow topics with identical, duplicate titles."
     unique_posts_mins: "How many minutes before a user can make a post with the same content again"

config/site_settings.yml

@@ -1431,7 +1431,6 @@ search:
       zh_TW: 2
       ko: 2
       ja: 2
-
   search_tokenize_chinese_japanese_korean: false
   search_prefer_recent_posts: false
   search_recent_posts_size:
@@ -1446,6 +1445,22 @@ search:
   search_query_log_max_retention_days:
     default: 365 # 1 year
     max: 1825 # 5 years
+  search_ignore_accents:
+    default: false
+    locale_default:
+      ar: true
+      ca: true
+      cs: true
+      el: true
+      es: true
+      fa_IR: true
+      fr: true
+      hu: true
+      pt: true
+      pt_BR: true
+      ro: true
+      sk: true
+      tr_TR: true
 
 uncategorized:
   version_checks:

lib/search/grouped_search_results.rb

@@ -63,13 +63,14 @@ class Search
     end
 
     def self.blurb_for(cooked, term = nil, blurb_length = 200)
-      cooked = SearchIndexer::HtmlScrubber.scrub(cooked).squish
-
       blurb = nil
+      cooked = SearchIndexer.scrub_html_for_search(cooked)
+
       if term
         terms = term.split(/\s+/)
         blurb = TextHelper.excerpt(cooked, terms.first, radius: blurb_length / 2, seperator: " ")
       end
+
       blurb = TextHelper.truncate(cooked, length: blurb_length, seperator: " ") if blurb.blank?
       Sanitize.clean(blurb)
     end

spec/services/search_indexer_spec.rb

@@ -3,6 +3,10 @@ require 'rails_helper'
 describe SearchIndexer do
   let(:post_id) { 99 }
 
+  def scrub(html, strip_diacritics: false)
+    SearchIndexer.scrub_html_for_search(html, strip_diacritics: strip_diacritics)
+  end
+
   it 'correctly indexes chinese' do
     SiteSetting.default_locale = 'zh_CN'
     data = "你好世界"
@@ -16,26 +20,26 @@ describe SearchIndexer do
 
   it 'extract youtube title' do
     html = "<div class=\"lazyYT\" data-youtube-id=\"lmFgeFh2nlw\" data-youtube-title=\"Metallica Mixer Explains Missing Bass on 'And Justice for All' [Exclusive]\" data-width=\"480\" data-height=\"270\" data-parameters=\"feature=oembed&amp;wmode=opaque\"></div>"
-
-    scrubbed = SearchIndexer::HtmlScrubber.scrub(html)
-
-    expect(scrubbed).to eq(" Metallica Mixer Explains Missing Bass on 'And Justice for All' [Exclusive] ")
+    scrubbed = scrub(html)
+    expect(scrubbed).to eq("Metallica Mixer Explains Missing Bass on 'And Justice for All' [Exclusive]")
   end
 
   it 'extract a link' do
     html = "<a href='http://meta.discourse.org/'>link</a>"
-
-    scrubbed = SearchIndexer::HtmlScrubber.scrub(html)
-
-    expect(scrubbed).to eq(" http://meta.discourse.org/  link ")
+    scrubbed = scrub(html)
+    expect(scrubbed).to eq("http://meta.discourse.org/ link")
   end
 
-  it 'removes diacritics' do
+  it 'uses ignore_accent setting to strip diacritics' do
     html = "<p>HELLO Hétérogénéité Здравствуйте هتاف للترحيب 你好</p>"
 
-    scrubbed = SearchIndexer::HtmlScrubber.scrub(html, strip_diacritics: true)
+    SiteSetting.search_ignore_accents = true
+    scrubbed = SearchIndexer.scrub_html_for_search(html)
+    expect(scrubbed).to eq("HELLO Heterogeneite Здравствуите هتاف للترحيب 你好")
 
-    expect(scrubbed).to eq(" HELLO Heterogeneite Здравствуите هتاف للترحيب 你好 ")
+    SiteSetting.search_ignore_accents = false
+    scrubbed = SearchIndexer.scrub_html_for_search(html)
+    expect(scrubbed).to eq("HELLO Hétérogénéité Здравствуйте هتاف للترحيب 你好")
   end
 
   it "doesn't index local files" do
@@ -54,9 +58,9 @@ describe SearchIndexer do
       </div>
     HTML
 
-    scrubbed = SearchIndexer::HtmlScrubber.scrub(html).gsub(/\s+/, " ")
+    scrubbed = scrub(html)
 
-    expect(scrubbed).to eq(" Discourse 51%20PM Untitled design (21).jpg Untitled%20design%20(21) Untitled design (21).jpg 1280x1136 472 KB ")
+    expect(scrubbed).to eq("Discourse 51%20PM Untitled design (21).jpg Untitled%20design%20(21) Untitled design (21).jpg 1280x1136 472 KB")
   end
 
   it 'correctly indexes a post according to version' do