Merge pull request #823 from reitermarkus/refactoring-tty

Refactor Tty.

30 files changed, 238 insertions, 176 deletions

diff --git a/Library/Homebrew/blacklist.rb b/Library/Homebrew/blacklist.rb
index 4312d0bf3..1c79da159 100644
--- a/Library/Homebrew/blacklist.rb
+++ b/Library/Homebrew/blacklist.rb
@@ -16,7 +16,7 @@ def blacklisted?(name)
     Homebrew provides pip via: `brew install python`. However you will then
     have two Pythons installed on your Mac, so alternatively you can install
     pip via the instructions at:
-      https://pip.readthedocs.io/en/stable/installing/
+      #{Formatter.url("https://pip.readthedocs.io/en/stable/installing/")}
     EOS
   when "pil" then <<-EOS.undent
     Instead of PIL, consider `pip install pillow` or `brew install Homebrew/python/pillow`.
@@ -24,7 +24,7 @@ def blacklisted?(name)
   when "macruby" then <<-EOS.undent
     MacRuby is not packaged and is on an indefinite development hiatus.
     You can read more about it at:
-      https://github.com/MacRuby/MacRuby
+      #{Formatter.url("https://github.com/MacRuby/MacRuby")}
     EOS
   when /(lib)?lzma/
     "lzma is now part of the xz formula."
@@ -50,7 +50,7 @@ def blacklisted?(name)
     To install Clojure you should install Leiningen:
       brew install leiningen
     and then follow the tutorial:
-      https://github.com/technomancy/leiningen/blob/stable/doc/TUTORIAL.md
+      #{Formatter.url("https://github.com/technomancy/leiningen/blob/stable/doc/TUTORIAL.md")}
     EOS
   when "osmium" then <<-EOS.undent
     The creator of Osmium requests that it not be packaged and that people
@@ -65,8 +65,8 @@ def blacklisted?(name)
       brew install typesafe-activator
 
     You can read more about this change at:
-      https://www.playframework.com/documentation/2.3.x/Migration23
-      https://www.playframework.com/documentation/2.3.x/Highlights23
+      #{Formatter.url("https://www.playframework.com/documentation/2.3.x/Migration23")}
+      #{Formatter.url("https://www.playframework.com/documentation/2.3.x/Highlights23")}
     EOS
   when "haskell-platform" then <<-EOS.undent
     We no longer package haskell-platform. Consider installing ghc
diff --git a/Library/Homebrew/brew.rb b/Library/Homebrew/brew.rb
index 1ba3fb8c2..c4a34d298 100644
--- a/Library/Homebrew/brew.rb
+++ b/Library/Homebrew/brew.rb
@@ -147,8 +147,8 @@ rescue Exception => e
   Utils::Analytics.report_exception(e)
   onoe e
   if internal_cmd && defined?(OS::ISSUES_URL)
-    $stderr.puts "#{Tty.white}Please report this bug:"
-    $stderr.puts "    #{Tty.em}#{OS::ISSUES_URL}#{Tty.reset}"
+    $stderr.puts "#{Tty.bold}Please report this bug:#{Tty.reset}"
+    $stderr.puts "  #{Formatter.url(OS::ISSUES_URL)}"
   end
   $stderr.puts e.backtrace
   exit 1
diff --git a/Library/Homebrew/cask/lib/hbc/artifact/moved.rb b/Library/Homebrew/cask/lib/hbc/artifact/moved.rb
index 6095887e3..22124005c 100644
--- a/Library/Homebrew/cask/lib/hbc/artifact/moved.rb
+++ b/Library/Homebrew/cask/lib/hbc/artifact/moved.rb
@@ -79,13 +79,10 @@ module Hbc
         load_specification artifact_spec
 
         if target.exist?
-          target_abv = " (#{target.abv})"
+          "#{printable_target} (#{target.abv})"
         else
-          warning = "Missing #{self.class.artifact_english_name}"
-          warning = "#{Tty.red}#{warning}#{Tty.reset}: "
+          Formatter.error(printable_target, label: "Missing #{self.class.artifact_english_name}")
         end
-
-        "#{warning}#{printable_target}#{target_abv}"
       end
     end
   end
diff --git a/Library/Homebrew/cask/lib/hbc/artifact/symlinked.rb b/Library/Homebrew/cask/lib/hbc/artifact/symlinked.rb
index 3ab45cccc..46dd42322 100644
--- a/Library/Homebrew/cask/lib/hbc/artifact/symlinked.rb
+++ b/Library/Homebrew/cask/lib/hbc/artifact/symlinked.rb
@@ -57,12 +57,17 @@ module Hbc
       def summarize_artifact(artifact_spec)
         load_specification artifact_spec
 
-        return unless self.class.islink?(target)
-
-        link_description = "#{Tty.red}Broken Link#{Tty.reset}: " unless target.exist?
-        target_readlink_abv = " (#{target.readlink.abv})" if target.readlink.exist?
+        if self.class.islink?(target) && target.exist? && target.readlink.exist?
+          "#{printable_target} -> #{target.readlink} (#{target.readlink.abv})"
+        else
+          string = if self.class.islink?(target)
+                     "#{printable_target} -> #{target.readlink}"
+                   else
+                     printable_target
+                   end
 
-        "#{link_description}#{printable_target} -> #{target.readlink}#{target_readlink_abv}"
+          Formatter.error(string, label: "Broken Link")
+        end
       end
     end
   end
diff --git a/Library/Homebrew/cask/lib/hbc/checkable.rb b/Library/Homebrew/cask/lib/hbc/checkable.rb
index 42c47ea78..03f052629 100644
--- a/Library/Homebrew/cask/lib/hbc/checkable.rb
+++ b/Library/Homebrew/cask/lib/hbc/checkable.rb
@@ -28,11 +28,11 @@ module Hbc
 
     def result
       if errors?
-        "#{Tty.red}failed#{Tty.reset}"
+        Formatter.error("failed")
       elsif warnings?
-        "#{Tty.yellow}warning#{Tty.reset}"
+        Formatter.warning("warning")
       else
-        "#{Tty.green}passed#{Tty.reset}"
+        Formatter.success("passed")
       end
     end
 
@@ -40,11 +40,11 @@ module Hbc
       summary = ["#{summary_header}: #{result}"]
 
       errors.each do |error|
-        summary << " #{Tty.red}-#{Tty.reset} #{error}"
+        summary << " #{Formatter.error("-")} #{error}"
       end
 
       warnings.each do |warning|
-        summary << " #{Tty.yellow}-#{Tty.reset} #{warning}"
+        summary << " #{Formatter.warning("-")} #{warning}"
       end
 
       summary.join("\n")
diff --git a/Library/Homebrew/cask/lib/hbc/cli/doctor.rb b/Library/Homebrew/cask/lib/hbc/cli/doctor.rb
index 34f000b29..e36999200 100644
--- a/Library/Homebrew/cask/lib/hbc/cli/doctor.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli/doctor.rb
@@ -122,11 +122,11 @@ module Hbc
       end
 
       def self.notfound_string
-        "#{Tty.red}Not Found - Unknown Error#{Tty.reset}"
+        Formatter.error("Not Found - Unknown Error")
       end
 
       def self.error_string(string = "Error")
-        "#{Tty.red}(#{string})#{Tty.reset}"
+        Formatter.error("(#{string})")
       end
 
       def self.render_with_none(string)
diff --git a/Library/Homebrew/cask/lib/hbc/cli/info.rb b/Library/Homebrew/cask/lib/hbc/cli/info.rb
index 7fbdff3eb..0957ba4fd 100644
--- a/Library/Homebrew/cask/lib/hbc/cli/info.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli/info.rb
@@ -18,16 +18,16 @@ module Hbc
 
       def self.info(cask)
         puts "#{cask.token}: #{cask.version}"
-        puts formatted_url(cask.homepage) if cask.homepage
+        puts Formatter.url(cask.homepage) if cask.homepage
         installation_info(cask)
-        puts "From: #{formatted_url(github_info(cask))}" if github_info(cask)
+        puts "From: #{Formatter.url(github_info(cask))}" if github_info(cask)
         name_info(cask)
         artifact_info(cask)
         Installer.print_caveats(cask)
       end
 
       def self.formatted_url(url)
-        "#{Tty.em}#{url}#{Tty.reset}"
+        "#{Tty.underline}#{url}#{Tty.reset}"
       end
 
       def self.installation_info(cask)
@@ -37,7 +37,7 @@ module Hbc
 
             puts versioned_staged_path.to_s
               .concat(" (")
-              .concat(versioned_staged_path.exist? ? versioned_staged_path.abv : "#{Tty.red}does not exist#{Tty.reset}")
+              .concat(versioned_staged_path.exist? ? versioned_staged_path.abv : Formatter.error("does not exist"))
               .concat(")")
           end
         else
@@ -47,7 +47,7 @@ module Hbc
 
       def self.name_info(cask)
         ohai cask.name.size > 1 ? "Names" : "Name"
-        puts cask.name.empty? ? "#{Tty.red}None#{Tty.reset}" : cask.name
+        puts cask.name.empty? ? Formatter.error("None") : cask.name
       end
 
       def self.github_info(cask)
diff --git a/Library/Homebrew/cask/lib/hbc/cli/style.rb b/Library/Homebrew/cask/lib/hbc/cli/style.rb
index 66117da8b..bb179fb0c 100644
--- a/Library/Homebrew/cask/lib/hbc/cli/style.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli/style.rb
@@ -30,7 +30,7 @@ module Hbc
           begin
             Homebrew.install_gem_setup_path! "rubocop-cask", RUBOCOP_CASK_VERSION, "rubocop"
           rescue SystemExit
-            raise CaskError, $stderr.string.chomp.sub("#{Tty.red}Error#{Tty.reset}: ", "")
+            raise CaskError, Tty.strip_ansi($stderr.string).chomp.sub(/\AError: /, "")
           end
         end
       end
diff --git a/Library/Homebrew/cask/lib/hbc/dsl/caveats.rb b/Library/Homebrew/cask/lib/hbc/dsl/caveats.rb
index 5efd7d562..9dd9abab1 100644
--- a/Library/Homebrew/cask/lib/hbc/dsl/caveats.rb
+++ b/Library/Homebrew/cask/lib/hbc/dsl/caveats.rb
@@ -102,12 +102,12 @@ module Hbc
 
         A report has been made to Apple about this app. Their certificate will hopefully be revoked.
         See the public report at
-          https://openradar.appspot.com/#{radar_number}
+          #{Formatter.url("https://openradar.appspot.com/#{radar_number}")}
 
         If this report is accurate, please duplicate it at
-          https://bugreport.apple.com/
+          #{Formatter.url("https://bugreport.apple.com/")}
         If this report is a mistake, please let us know by opening an issue at
-          https://github.com/caskroom/homebrew-cask/issues/new
+          #{Formatter.url("https://github.com/caskroom/homebrew-cask/issues/new")}
 
         EOS
       end
diff --git a/Library/Homebrew/cask/lib/hbc/installer.rb b/Library/Homebrew/cask/lib/hbc/installer.rb
index f0cc0d1a9..4d29acb75 100644
--- a/Library/Homebrew/cask/lib/hbc/installer.rb
+++ b/Library/Homebrew/cask/lib/hbc/installer.rb
@@ -87,7 +87,7 @@ module Hbc
       s = if MacOS.version >= :lion && !ENV["HOMEBREW_NO_EMOJI"]
             (ENV["HOMEBREW_INSTALL_BADGE"] || "\xf0\x9f\x8d\xba") + "  "
           else
-            "#{Tty.blue}==>#{Tty.reset} #{Tty.white}Success!#{Tty.reset} "
+            Formatter.headline("Success! ", color: :blue)
           end
       s << "#{@cask} was successfully installed!"
     end
diff --git a/Library/Homebrew/cask/lib/hbc/utils.rb b/Library/Homebrew/cask/lib/hbc/utils.rb
index 9159544a6..d42d78ef7 100644
--- a/Library/Homebrew/cask/lib/hbc/utils.rb
+++ b/Library/Homebrew/cask/lib/hbc/utils.rb
@@ -32,12 +32,7 @@ end
 def odebug(title, *sput)
   return unless Hbc.respond_to?(:debug)
   return unless Hbc.debug
-
-  width = Tty.width * 4 - 6
-  if $stdout.tty? && title.to_s.length > width
-    title = title.to_s[0, width - 3] + "..."
-  end
-  puts "#{Tty.magenta}==>#{Tty.reset} #{Tty.white}#{title}#{Tty.reset}"
+  puts Formatter.headline(title, color: :magenta)
   puts sput unless sput.empty?
 end
 
@@ -151,12 +146,10 @@ module Hbc
     def self.error_message_with_suggestions
       <<-EOS.undent
         Most likely, this means you have an outdated version of Homebrew-Cask. Please run:
+          #{UPDATE_CMD}
 
-            #{Tty.green}#{UPDATE_CMD}
-
-        #{Tty.reset}If this doesn’t fix the problem, please report this bug:
-
-            #{Tty.em}#{ISSUES_URL}#{Tty.reset}
+        If this doesn’t fix the problem, please report this bug:
+          #{Formatter.url(ISSUES_URL)}
 
       EOS
     end
diff --git a/Library/Homebrew/cmd/doctor.rb b/Library/Homebrew/cmd/doctor.rb
index 89f32dc25..0fcd3a74d 100644
--- a/Library/Homebrew/cmd/doctor.rb
+++ b/Library/Homebrew/cmd/doctor.rb
@@ -42,9 +42,9 @@ module Homebrew
       next if out.nil? || out.empty?
       if first_warning
         $stderr.puts <<-EOS.undent
-            #{Tty.white}Please note that these warnings are just used to help the Homebrew maintainers
-            with debugging if you file an issue. If everything you use Homebrew for is
-            working fine: please don't worry and just ignore them. Thanks!#{Tty.reset}
+          #{Tty.bold}Please note that these warnings are just used to help the Homebrew maintainers
+          with debugging if you file an issue. If everything you use Homebrew for is
+          working fine: please don't worry and just ignore them. Thanks!#{Tty.reset}
         EOS
       end
 
diff --git a/Library/Homebrew/cmd/help.rb b/Library/Homebrew/cmd/help.rb
index 2a814b90b..c8845b086 100644
--- a/Library/Homebrew/cmd/help.rb
+++ b/Library/Homebrew/cmd/help.rb
@@ -79,9 +79,10 @@ module Homebrew
     else
       help_lines.map do |line|
         line.slice(2..-1)
-            .sub(/^  \* /, "#{Tty.highlight}brew#{Tty.reset} ")
-            .gsub(/`(.*?)`/, "#{Tty.highlight}\\1#{Tty.reset}")
-            .gsub(/<(.*?)>/, "#{Tty.em}\\1#{Tty.reset}")
+            .sub(/^  \* /, "#{Tty.bold}brew#{Tty.reset} ")
+            .gsub(/`(.*?)`/, "#{Tty.bold}\\1#{Tty.reset}")
+            .gsub(%r{<([^\s]+?://[^\s]+?)>}) { |url| Formatter.url(url) }
+            .gsub(/<(.*?)>/, "#{Tty.underline}\\1#{Tty.reset}")
             .gsub("@hide_from_man_page", "")
       end.join.strip
     end
diff --git a/Library/Homebrew/cmd/info.rb b/Library/Homebrew/cmd/info.rb
index 6f242039c..2cfb89ea5 100644
--- a/Library/Homebrew/cmd/info.rb
+++ b/Library/Homebrew/cmd/info.rb
@@ -117,7 +117,7 @@ module Homebrew
 
     puts "#{f.full_name}: #{specs * ", "}#{" [#{attrs * ", "}]" unless attrs.empty?}"
     puts f.desc if f.desc
-    puts "#{Tty.em}#{f.homepage}#{Tty.reset}" if f.homepage
+    puts Formatter.url(f.homepage) if f.homepage
 
     conflicts = f.conflicts.map(&:name).sort!
     puts "Conflicts with: #{conflicts*", "}" unless conflicts.empty?
@@ -133,7 +133,7 @@ module Homebrew
       end
     end
 
-    puts "From: #{Tty.em}#{github_info(f)}#{Tty.reset}"
+    puts "From: #{Formatter.url(github_info(f))}"
 
     unless f.deps.empty?
       ohai "Dependencies"
diff --git a/Library/Homebrew/cmd/update-report.rb b/Library/Homebrew/cmd/update-report.rb
index 18f2f370c..f97191bda 100644
--- a/Library/Homebrew/cmd/update-report.rb
+++ b/Library/Homebrew/cmd/update-report.rb
@@ -282,13 +282,13 @@ module Homebrew
     EOS
   rescue => e
     ofail <<-EOS.undent
-      #{Tty.white}Failed to migrate HOMEBREW_REPOSITORY to #{new_homebrew_repository}!
+      #{Tty.bold}Failed to migrate HOMEBREW_REPOSITORY to #{new_homebrew_repository}!#{Tty.reset}
       The error was:
         #{e}
       Please try to resolve this error yourself and then run `brew update` again to
       complete the migration. If you need help please +1 an existing error or comment
       with your new error in issue:
-        #{Tty.em}https://github.com/Homebrew/brew/issues/987#{Tty.reset}
+        #{Formatter.url("https://github.com/Homebrew/brew/issues/987")}
     EOS
     $stderr.puts e.backtrace
   end
diff --git a/Library/Homebrew/compat.rb b/Library/Homebrew/compat.rb
index eabc7dfa0..98624aebd 100644
--- a/Library/Homebrew/compat.rb
+++ b/Library/Homebrew/compat.rb
@@ -15,3 +15,4 @@ require "compat/dependency_collector"
 require "compat/language/haskell"
 require "compat/xcode"
 require "compat/software_spec"
+require "compat/utils"
diff --git a/Library/Homebrew/compat/utils.rb b/Library/Homebrew/compat/utils.rb
index 7de5e85c3..7b529f04e 100644
--- a/Library/Homebrew/compat/utils.rb
+++ b/Library/Homebrew/compat/utils.rb
@@ -8,3 +8,11 @@ def shell_profile
   else "~/.bash_profile"
   end
 end
+
+module Tty
+  module_function
+
+  def white
+    reset.bold
+  end
+end
diff --git a/Library/Homebrew/debrew.rb b/Library/Homebrew/debrew.rb
index 1c5047a8c..668a0b4d2 100644
--- a/Library/Homebrew/debrew.rb
+++ b/Library/Homebrew/debrew.rb
@@ -111,7 +111,7 @@ module Debrew
 
     begin
       puts e.backtrace.first.to_s
-      puts "#{Tty.red}#{e.class.name}#{Tty.reset}: #{e}"
+      puts Formatter.error(e, label: e.class.name)
 
       loop do
         Menu.choose do |menu|
diff --git a/Library/Homebrew/descriptions.rb b/Library/Homebrew/descriptions.rb
index 0ef4316d3..cc690c050 100644
--- a/Library/Homebrew/descriptions.rb
+++ b/Library/Homebrew/descriptions.rb
@@ -119,12 +119,12 @@ class Descriptions
   # Take search results -- a hash mapping formula names to descriptions -- and
   # print them.
   def print
-    blank = "#{Tty.yellow}[no description]#{Tty.reset}"
+    blank = Formatter.warning("[no description]")
     @descriptions.keys.sort.each do |full_name|
       short_name = short_names[full_name]
       printed_name = short_name_counts[short_name] == 1 ? short_name : full_name
       description = @descriptions[full_name] || blank
-      puts "#{Tty.white}#{printed_name}:#{Tty.reset} #{description}"
+      puts "#{Tty.bold}#{printed_name}:#{Tty.reset} #{description}"
     end
   end
 
diff --git a/Library/Homebrew/dev-cmd/bottle.rb b/Library/Homebrew/dev-cmd/bottle.rb
index 83e40f25d..6a16deef4 100644
--- a/Library/Homebrew/dev-cmd/bottle.rb
+++ b/Library/Homebrew/dev-cmd/bottle.rb
@@ -54,7 +54,7 @@ module Homebrew
 
       return if @put_filenames.include? filename
 
-      puts "#{Tty.red}#{filename}#{Tty.reset}"
+      puts Formatter.error(filename.to_s)
       @put_filenames << filename
     end
 
@@ -93,7 +93,7 @@ module Homebrew
       next unless ARGV.verbose? && !text_matches.empty?
       print_filename.call(string, file)
       text_matches.first(MAXIMUM_STRING_MATCHES).each do |match, offset|
-        puts " #{Tty.gray}-->#{Tty.reset} match '#{match}' at offset #{Tty.em}0x#{offset}#{Tty.reset}"
+        puts " #{Tty.gray}-->#{Tty.reset} match '#{match}' at offset #{Tty.bold}0x#{offset}#{Tty.reset}"
       end
 
       if text_matches.size > MAXIMUM_STRING_MATCHES
diff --git a/Library/Homebrew/diagnostic.rb b/Library/Homebrew/diagnostic.rb
index ca8ade9ff..6546714e8 100644
--- a/Library/Homebrew/diagnostic.rb
+++ b/Library/Homebrew/diagnostic.rb
@@ -473,7 +473,7 @@ module Homebrew
           If you have trouble downloading packages with Homebrew, then maybe this
           is the problem? If the following command doesn't work, then try removing
           your curlrc:
-            curl https://github.com
+            curl #{Formatter.url("https://github.com")}
         EOS
       end
 
@@ -610,7 +610,7 @@ module Homebrew
 
             Setting DYLD_INSERT_LIBRARIES can cause Go builds to fail.
             Having this set is common if you use this software:
-              http://asepsis.binaryage.com/
+              #{Formatter.url("http://asepsis.binaryage.com/")}
           EOS
         end
 
@@ -752,7 +752,7 @@ module Homebrew
             Without a correctly configured origin, Homebrew won't update
             properly. You can solve this by adding the Homebrew remote:
               cd #{HOMEBREW_REPOSITORY}
-              git remote add origin https://github.com/Homebrew/brew.git
+              git remote add origin #{Formatter.url("https://github.com/Homebrew/brew.git")}
           EOS
         elsif origin !~ %r{Homebrew/brew(\.git)?$}
           <<-EOS.undent
@@ -764,7 +764,7 @@ module Homebrew
 
             Unless you have compelling reasons, consider setting the
             origin remote to point at the main repository, located at:
-              https://github.com/Homebrew/brew.git
+              #{Formatter.url("https://github.com/Homebrew/brew.git")}
           EOS
         end
       end
@@ -956,8 +956,8 @@ module Homebrew
         <<-EOS.undent
           A .pydistutils.cfg file was found in $HOME, which may cause Python
           builds to fail. See:
-            https://bugs.python.org/issue6138
-            https://bugs.python.org/issue4655
+            #{Formatter.url("https://bugs.python.org/issue6138")}
+            #{Formatter.url("https://bugs.python.org/issue4655")}
         EOS
       end
 
diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 07658c6e7..e01a60c75 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -318,7 +318,7 @@ class BuildError < RuntimeError
   def dump
     if !ARGV.verbose?
       puts
-      puts "#{Tty.red}READ THIS#{Tty.reset}: #{Tty.em}#{OS::ISSUES_URL}#{Tty.reset}"
+      puts Formatter.error(Formatter.url(OS::ISSUES_URL), label: "READ THIS")
       if formula.tap
         case formula.tap.name
         when "homebrew/boneyard"
@@ -327,7 +327,7 @@ class BuildError < RuntimeError
         else
           if issues_url = formula.tap.issues_url
             puts "If reporting this issue please do so at (not Homebrew/brew):"
-            puts "  #{issues_url}"
+            puts "  #{Formatter.url(issues_url)}"
           end
         end
       end
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 652f87ae3..09c11318e 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -214,7 +214,7 @@ class FormulaInstaller
       opoo "#{formula.full_name}: #{old_flag} was deprecated; using #{new_flag} instead!"
     end
 
-    oh1 "Installing #{Tty.green}#{formula.full_name}#{Tty.reset}" if show_header?
+    oh1 "Installing #{Formatter.identifier(formula.full_name)}" if show_header?
 
     if formula.tap && !formula.tap.private?
       options = []
@@ -426,7 +426,7 @@ class FormulaInstaller
     if deps.empty? && only_deps?
       puts "All dependencies for #{formula.full_name} are satisfied."
     elsif !deps.empty?
-      oh1 "Installing dependencies for #{formula.full_name}: #{Tty.green}#{deps.map(&:first)*", "}#{Tty.reset}",
+      oh1 "Installing dependencies for #{formula.full_name}: #{deps.map(&:first).map(&Formatter.method(:identifier)).join(", ")}",
         truncate: false
       deps.each { |dep, options| install_dependency(dep, options) }
     end
@@ -476,7 +476,7 @@ class FormulaInstaller
     fi.verbose            = verbose? && !quieter?
     fi.debug              = debug?
     fi.prelude
-    oh1 "Installing #{formula.full_name} dependency: #{Tty.green}#{dep.name}#{Tty.reset}"
+    oh1 "Installing #{formula.full_name} dependency: #{Formatter.identifier(dep.name)}"
     fi.install
     fi.finish
   rescue Exception
diff --git a/Library/Homebrew/migrator.rb b/Library/Homebrew/migrator.rb
index 4f8cba1ce..fe480cd3b 100644
--- a/Library/Homebrew/migrator.rb
+++ b/Library/Homebrew/migrator.rb
@@ -153,7 +153,7 @@ class Migrator
     end
 
     begin
-      oh1 "Migrating #{Tty.green}#{oldname}#{Tty.white} to #{Tty.green}#{newname}#{Tty.reset}"
+      oh1 "Migrating #{Formatter.identifier(oldname)} to #{Formatter.identifier(newname)}"
       lock
       unlink_oldname
       move_to_new_directory
@@ -200,7 +200,7 @@ class Migrator
   end
 
   def unlink_oldname
-    oh1 "Unlinking #{Tty.green}#{oldname}#{Tty.reset}"
+    oh1 "Unlinking #{Formatter.identifier(oldname)}"
     old_cellar.subdirs.each do |d|
       keg = Keg.new(d)
       keg.unlink
@@ -208,7 +208,7 @@ class Migrator
   end
 
   def link_newname
-    oh1 "Linking #{Tty.green}#{newname}#{Tty.reset}"
+    oh1 "Linking #{Formatter.identifier(newname)}"
     new_keg = Keg.new(new_linked_keg_record)
 
     # If old_keg wasn't linked then we just optlink a keg.
diff --git a/Library/Homebrew/requirements.rb b/Library/Homebrew/requirements.rb
index 274ba5c9b..87b315cb7 100644
--- a/Library/Homebrew/requirements.rb
+++ b/Library/Homebrew/requirements.rb
@@ -44,7 +44,7 @@ class XcodeRequirement < Requirement
       EOS
     else
       message + <<-EOS.undent
-        Xcode can be installed from https://developer.apple.com/xcode/downloads/
+        Xcode can be installed from #{Formatter.url("https://developer.apple.com/xcode/downloads/")}
       EOS
     end
   end
diff --git a/Library/Homebrew/test/test_utils.rb b/Library/Homebrew/test/test_utils.rb
index c88c0f416..a40a56775 100644
--- a/Library/Homebrew/test/test_utils.rb
+++ b/Library/Homebrew/test/test_utils.rb
@@ -5,8 +5,11 @@ require "utils/shell"
 
 class TtyTests < Homebrew::TestCase
   def test_strip_ansi
-    assert_equal "hello",
-      Tty.strip_ansi("\033\[36;7mhello\033\[0m")
+    assert_equal "hello", Tty.strip_ansi("\033\[36;7mhello\033\[0m")
+  end
+
+  def test_width
+    assert_kind_of Integer, Tty.width
   end
 
   def test_truncate
@@ -21,15 +24,26 @@ class TtyTests < Homebrew::TestCase
 
   def test_no_tty_formatting
     $stdout.stubs(:tty?).returns false
-    assert_nil Tty.blue
-    assert_nil Tty.white
-    assert_nil Tty.red
-    assert_nil Tty.green
-    assert_nil Tty.gray
-    assert_nil Tty.yellow
-    assert_nil Tty.reset
-    assert_nil Tty.em
-    assert_nil Tty.highlight
+    assert_equal "", Tty.to_s
+    assert_equal "", Tty.red.to_s
+    assert_equal "", Tty.green.to_s
+    assert_equal "", Tty.yellow.to_s
+    assert_equal "", Tty.blue.to_s
+    assert_equal "", Tty.magenta.to_s
+    assert_equal "", Tty.cyan.to_s
+    assert_equal "", Tty.default.to_s
+  end
+
+  def test_formatting
+    $stdout.stubs(:tty?).returns(true)
+    assert_equal "",         Tty.to_s
+    assert_equal "\033[31m", Tty.red.to_s
+    assert_equal "\033[32m", Tty.green.to_s
+    assert_equal "\033[33m", Tty.yellow.to_s
+    assert_equal "\033[34m", Tty.blue.to_s
+    assert_equal "\033[35m", Tty.magenta.to_s
+    assert_equal "\033[36m", Tty.cyan.to_s
+    assert_equal "\033[39m", Tty.default.to_s
   end
 end
 
diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 58083fe1b..8d91c15c0 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -1,6 +1,7 @@
 require "pathname"
 require "emoji"
 require "exceptions"
+require "utils/formatter"
 require "utils/hash"
 require "utils/json"
 require "utils/inreplace"
@@ -10,85 +11,11 @@ require "utils/git"
 require "utils/analytics"
 require "utils/github"
 require "utils/curl"
-
-class Tty
-  class << self
-    def strip_ansi(string)
-      string.gsub(/\033\[\d+(;\d+)*m/, "")
-    end
-
-    def blue
-      bold 34
-    end
-
-    def white
-      bold 39
-    end
-
-    def magenta
-      bold 35
-    end
-
-    def red
-      underline 31
-    end
-
-    def yellow
-      underline 33
-    end
-
-    def reset
-      escape 0
-    end
-
-    def em
-      underline 39
-    end
-
-    def green
-      bold 32
-    end
-
-    def gray
-      bold 30
-    end
-
-    def highlight
-      bold 39
-    end
-
-    def width
-      `/usr/bin/tput cols`.strip.to_i
-    end
-
-    def truncate(str)
-      w = width
-      w > 10 ? str.to_s[0, w - 4] : str
-    end
-
-    private
-
-    def color(n)
-      escape "0;#{n}"
-    end
-
-    def bold(n)
-      escape "1;#{n}"
-    end
-
-    def underline(n)
-      escape "4;#{n}"
-    end
-
-    def escape(n)
-      "\033[#{n}m" if $stdout.tty?
-    end
-  end
-end
+require "utils/tty"
 
 def ohai(title, *sput)
   title = Tty.truncate(title) if $stdout.tty? && !ARGV.verbose?
-  puts "#{Tty.blue}==>#{Tty.white} #{title}#{Tty.reset}"
+  puts Formatter.headline(title, color: :blue)
   puts sput
 end
 
@@ -96,16 +23,16 @@ def oh1(title, options = {})
   if $stdout.tty? && !ARGV.verbose? && options.fetch(:truncate, :auto) == :auto
     title = Tty.truncate(title)
   end
-  puts "#{Tty.green}==>#{Tty.white} #{title}#{Tty.reset}"
+  puts Formatter.headline(title, color: :green)
 end
 
 # Print a warning (do this rarely)
-def opoo(warning)
-  $stderr.puts "#{Tty.yellow}Warning#{Tty.reset}: #{warning}"
+def opoo(message)
+  $stderr.puts Formatter.warning(message, label: "Warning")
 end
 
-def onoe(error)
-  $stderr.puts "#{Tty.red}Error#{Tty.reset}: #{error}"
+def onoe(message)
+  $stderr.puts Formatter.error(message, label: "Error")
 end
 
 def ofail(error)
@@ -171,9 +98,9 @@ def pretty_installed(f)
   if !$stdout.tty?
     f.to_s
   elsif Emoji.enabled?
-    "#{Tty.highlight}#{f} #{Tty.green}#{Emoji.tick}#{Tty.reset}"
+    "#{Tty.bold}#{f} #{Formatter.success(Emoji.tick)}#{Tty.reset}"
   else
-    "#{Tty.highlight}#{Tty.green}#{f} (installed)#{Tty.reset}"
+    Formatter.success("#{Tty.bold}#{f} (installed)#{Tty.reset}")
   end
 end
 
@@ -181,9 +108,9 @@ def pretty_uninstalled(f)
   if !$stdout.tty?
     f.to_s
   elsif Emoji.enabled?
-    "#{f} #{Tty.red}#{Emoji.cross}#{Tty.reset}"
+    "#{Tty.bold}#{f} #{Formatter.error(Emoji.cross)}#{Tty.reset}"
   else
-    "#{Tty.red}#{f} (uninstalled)#{Tty.reset}"
+    Formatter.error("#{Tty.bold}#{f} (uninstalled)#{Tty.reset}")
   end
 end
 
diff --git a/Library/Homebrew/utils/formatter.rb b/Library/Homebrew/utils/formatter.rb
new file mode 100644
index 000000000..cb4f041f4
--- /dev/null
+++ b/Library/Homebrew/utils/formatter.rb
@@ -0,0 +1,52 @@
+require "utils/tty"
+
+module Formatter
+  module_function
+
+  def arrow(string, color: nil)
+    prefix("==>", string, color)
+  end
+
+  def headline(string, color: nil)
+    arrow("#{Tty.bold}#{string}#{Tty.reset}", color: color)
+  end
+
+  def identifier(string)
+    "#{Tty.green}#{string}#{Tty.reset}"
+  end
+
+  def success(string, label: nil)
+    label(label, string, :green)
+  end
+
+  def warning(string, label: nil)
+    label(label, string, :yellow)
+  end
+
+  def error(string, label: nil)
+    label(label, string, :red)
+  end
+
+  def url(string)
+    "#{Tty.underline}#{string}#{Tty.no_underline}"
+  end
+
+  def label(label, string, color)
+    label = "#{label}:" unless label.nil?
+    prefix(label, string, color)
+  end
+  private_class_method :label
+
+  def prefix(prefix, string, color)
+    if prefix.nil? && color.nil?
+      string
+    elsif prefix.nil?
+      "#{Tty.send(color)}#{string}#{Tty.reset}"
+    elsif color.nil?
+      "#{prefix} #{string}"
+    else
+      "#{Tty.send(color)}#{prefix}#{Tty.reset} #{string}"
+    end
+  end
+  private_class_method :prefix
+end
diff --git a/Library/Homebrew/utils/github.rb b/Library/Homebrew/utils/github.rb
index b7ec538f9..5611f9aad 100644
--- a/Library/Homebrew/utils/github.rb
+++ b/Library/Homebrew/utils/github.rb
@@ -14,7 +14,7 @@ module GitHub
       super <<-EOS.undent
         GitHub API Error: #{error}
         Try again in #{pretty_ratelimit_reset(reset)}, or create a personal access token:
-          #{Tty.em}https://github.com/settings/tokens/new?scopes=&description=Homebrew#{Tty.reset}
+          #{Formatter.url("https://github.com/settings/tokens/new?scopes=&description=Homebrew")}
         and then set the token as: export HOMEBREW_GITHUB_API_TOKEN="your_new_token"
       EOS
     end
@@ -30,7 +30,7 @@ module GitHub
       if ENV["HOMEBREW_GITHUB_API_TOKEN"]
         message << <<-EOS.undent
           HOMEBREW_GITHUB_API_TOKEN may be invalid or expired; check:
-          #{Tty.em}https://github.com/settings/tokens#{Tty.reset}
+          #{Formatter.url("https://github.com/settings/tokens")}
         EOS
       else
         message << <<-EOS.undent
@@ -38,7 +38,7 @@ module GitHub
           Clear them with:
             printf "protocol=https\\nhost=github.com\\n" | git credential-osxkeychain erase
           Or create a personal access token:
-            #{Tty.em}https://github.com/settings/tokens/new?scopes=&description=Homebrew#{Tty.reset}
+            #{Formatter.url("https://github.com/settings/tokens/new?scopes=&description=Homebrew")}
           and then set the token as: export HOMEBREW_GITHUB_API_TOKEN="your_new_token"
         EOS
       end
@@ -106,14 +106,14 @@ module GitHub
           onoe <<-EOS.undent
             Your macOS keychain GitHub credentials do not have sufficient scope!
             Scopes they have: #{credentials_scopes}
-            Create a personal access token: https://github.com/settings/tokens
+            Create a personal access token: #{Formatter.url("https://github.com/settings/tokens")}
             and then set HOMEBREW_GITHUB_API_TOKEN as the authentication method instead.
           EOS
         when :environment
           onoe <<-EOS.undent
             Your HOMEBREW_GITHUB_API_TOKEN does not have sufficient scope!
             Scopes it has: #{credentials_scopes}
-            Create a new personal access token: https://github.com/settings/tokens
+            Create a new personal access token: #{Formatter.url("https://github.com/settings/tokens")}
             and then set the new HOMEBREW_GITHUB_API_TOKEN as the authentication method instead.
           EOS
         end
diff --git a/Library/Homebrew/utils/tty.rb b/Library/Homebrew/utils/tty.rb
new file mode 100644
index 000000000..505165dc5
--- /dev/null
+++ b/Library/Homebrew/utils/tty.rb
@@ -0,0 +1,64 @@
+module Tty
+  module_function
+
+  def strip_ansi(string)
+    string.gsub(/\033\[\d+(;\d+)*m/, "")
+  end
+
+  def width
+    `/usr/bin/tput cols`.strip.to_i
+  end
+
+  def truncate(string)
+    (w = width).zero? ? string.to_s : string.to_s[0, w - 4]
+  end
+
+  COLOR_CODES = {
+    red: 31,
+    green: 32,
+    yellow: 33,
+    blue: 34,
+    magenta: 35,
+    cyan: 36,
+    default: 39,
+  }.freeze
+
+  STYLE_CODES = {
+    reset: 0,
+    bold: 1,
+    italic: 3,
+    underline: 4,
+    strikethrough: 9,
+    no_underline: 24,
+  }.freeze
+
+  CODES = COLOR_CODES.merge(STYLE_CODES).freeze
+
+  def append_to_escape_sequence(code)
+    @escape_sequence ||= []
+    @escape_sequence << code
+    self
+  end
+
+  def current_escape_sequence
+    return "" if @escape_sequence.nil?
+    "\033[#{@escape_sequence.join(";")}m"
+  end
+
+  def reset_escape_sequence!
+    @escape_sequence = nil
+  end
+
+  CODES.each do |name, code|
+    define_singleton_method(name) do
+      append_to_escape_sequence(code)
+    end
+  end
+
+  def to_s
+    return "" unless $stdout.tty?
+    current_escape_sequence
+  ensure
+    reset_escape_sequence!
+  end
+end