Obsidian [[WikiLinks|with aliases]] preprocessor for Marked app

obsidian_to_marked_wikilink_preprocessor.rb

#!/usr/bin/ruby

# Modified for Obsidian WikiLinks by @radekkozak
# Original idea for The Archive @mjknght at zettelkasten.de

require 'uri'

VAULT_NAME = 'ZETTELKASTEN' 

def class_exists?(class_name)
  klass = Module.const_get(class_name)
  return klass.is_a?(Class)
rescue NameError
  return false
end

if class_exists? 'Encoding'
  Encoding.default_external = Encoding::UTF_8 if Encoding.respond_to?('default_external')
  Encoding.default_internal = Encoding::UTF_8 if Encoding.respond_to?('default_internal')
end

begin
  input = STDIN.read.force_encoding('utf-8')
rescue
  input = STDIN.read
end

input.gsub!(/\[\[(.*?)\]\]/) do |m|
  match = Regexp.last_match
  if match[1].include?('|') 
    splits = match[1].split('|')
    "[#{splits[1]}](obsidian://vault/" + ::VAULT_NAME + "/#{URI.escape(splits[0])})"
  else
    "[#{match[1]}](obsidian://vault/" + ::VAULT_NAME + "/#{URI.escape(match[1])})"
  end
end

print input