Properly encode hyperlinks with special characters

This also works on Windows now, since absolute paths include a colon after the
drive letter, the `file:` URI needs to start with a triple slash.

colorls.gemspec

@@ -61,6 +61,7 @@ Gem::Specification.new do |spec|
 
   spec.post_install_message = POST_INSTALL_MESSAGE
 
+  spec.add_runtime_dependency 'addressable', '~> 2.7'
   spec.add_runtime_dependency 'clocale', '~> 0'
   spec.add_runtime_dependency 'filesize', '~> 0'
   spec.add_runtime_dependency 'manpages', '~> 0'

lib/colorls.rb

@@ -8,6 +8,7 @@ require 'io/console'
 require 'rainbow/ext/string'
 require 'clocale'
 require 'unicode/display_width'
+require 'addressable/uri'
 
 require 'colorls/core'
 require 'colorls/fileinfo'

lib/colorls/core.rb

@@ -377,8 +377,8 @@ module ColorLS
     end
 
     def make_link(path, name)
-      href = "file://#{File.absolute_path(path)}/#{name}"
-      "\033]8;;#{href}\007#{name}\033]8;;\007"
+      uri = Addressable::URI.convert_path(File.absolute_path(File.join(path, name)))
+      "\033]8;;#{uri}\007#{name}\033]8;;\007"
     end
   end
 end

spec/color_ls/flags_spec.rb

@@ -291,9 +291,15 @@ RSpec.describe ColorLS::Flags do
   context 'with --hyperlink flag' do
     let(:args) { ['--hyperlink', FIXTURES] }
 
-    href = "file://#{File.absolute_path(FIXTURES)}/a.txt"
+    href = if File::ALT_SEPARATOR.nil?
+             "file://#{File.absolute_path(FIXTURES)}/a.txt"
+           else
+             "file:///#{File.absolute_path(FIXTURES)}/a.txt"
+           end
 
-    it { expect { subject }.to output(include(href)).to_stdout }
+    pattern = File.fnmatch('cat', 'CAT', File::FNM_SYSCASE) ? /#{href}/i : /#{href}/
+
+    it { expect { subject }.to output(match(pattern)).to_stdout }
   end
 
   context 'symlinked directory' do