Fix #4957: Autotag non-web_source.

Autotag non-web_source on posts that have a non-http:// or https:// URL.
Add a fix script to backfill old posts.

Syntactically invalid URLs are still considered web sources. For
example, `https://google,com` technically isn't a valid URL, but it's
not considered a non-web source.

script/fixes/089_add_non-web_source_tag.rb

@@ -0,0 +1,25 @@
+#!/usr/bin/env ruby
+
+require_relative "base"
+
+CurrentUser.scoped(User.system) do
+  Post.system_tag_match("-source:none -source:http://* -source:https://* -non-web_source").find_each do |post|
+    puts "post ##{post.id}: adding non-web_source"
+    post.save!
+  end
+
+  Post.system_tag_match("source:none non-web_source").find_each do |post|
+    puts "post ##{post.id}: removing non-web_source"
+    post.save!
+  end
+
+  Post.system_tag_match("source:http://* non-web_source").find_each do |post|
+    puts "post ##{post.id}: removing non-web_source"
+    post.save!
+  end
+
+  Post.system_tag_match("source:https://* non-web_source").find_each do |post|
+    puts "post ##{post.id}: removing non-web_source"
+    post.save!
+  end
+end