Handle hashtags in spoiler_texts (partial fix for #699) (#2683)

* services: scan spoiler_text for hashtags (#699)

* views: link hashtags from spoiler_texts

This covers linking hashtags from within the spoiler
text on the server-generated pages.

* services: fix string concat going into hashtag RE

Cleaner Ruby syntax, may handle immutable strings better

app/lib/formatter.rb

@@ -25,6 +25,17 @@ class Formatter
     sanitize(html, Sanitize::Config::MASTODON_STRICT).html_safe # rubocop:disable Rails/OutputSafety
   end
 
+  def format_spoiler(status)
+    return reformat(status.spoiler_text) unless status.local?
+
+    html = status.spoiler_text
+    html = encode(html)
+    html = html.delete("\n")
+    html = link_hashtags(html)
+
+    html.html_safe # rubocop:disable Rails/OutputSafety
+  end
+
   def plaintext(status)
     return status.text if status.local?
     strip_tags(status.text)

app/services/process_hashtags_service.rb

@@ -2,7 +2,8 @@
 
 class ProcessHashtagsService < BaseService
   def call(status, tags = [])
-    tags = status.text.scan(Tag::HASHTAG_RE).map(&:first) if status.local?
+    text = [status.text, status.spoiler_text].reject(&:empty?).join(' ')
+    tags = text.scan(Tag::HASHTAG_RE).map(&:first) if status.local?
 
     tags.map { |str| str.mb_chars.downcase }.uniq(&:to_s).each do |tag|
       status.tags << Tag.where(name: tag).first_or_initialize(name: tag)

app/views/stream_entries/_detailed_status.html.haml

@@ -10,7 +10,7 @@
   .status__content.p-name.emojify<
     - if status.spoiler_text?
       %p{ style: 'margin-bottom: 0' }<
-        %span.p-summary> #{status.spoiler_text}&nbsp;
+        %span.p-summary> #{Formatter.instance.format_spoiler(status)}&nbsp;
         %a.status__content__spoiler-link{ href: '#' }= t('statuses.show_more')
     .e-content{ lang: status.language, style: "display: #{status.spoiler_text? ? 'none' : 'block'}; direction: #{rtl?(status.content) ? 'rtl' : 'ltr'}" }= Formatter.instance.format(status)
 

app/views/stream_entries/_simple_status.html.haml

@@ -16,7 +16,7 @@
   .status__content.p-name.emojify<
     - if status.spoiler_text?
       %p{ style: 'margin-bottom: 0' }<
-        %span.p-summary> #{status.spoiler_text}&nbsp;
+        %span.p-summary> #{Formatter.instance.format_spoiler(status)}&nbsp;
         %a.status__content__spoiler-link{ href: '#' }= t('statuses.show_more')
     .e-content{ lang: status.language, style: "display: #{status.spoiler_text? ? 'none' : 'block'}; direction: #{rtl?(status.content) ? 'rtl' : 'ltr'}" }= Formatter.instance.format(status)