Merge pull request #1732 from zmwangx/hint-migrations

Hint at new location of migrated formulae

16 files changed, 413 insertions, 252 deletions

diff --git a/Library/Homebrew/blacklist.rb b/Library/Homebrew/blacklist.rb
deleted file mode 100644
index 93c8f81a0..000000000
--- a/Library/Homebrew/blacklist.rb
+++ /dev/null
@@ -1,92 +0,0 @@
-def blacklisted?(name)
-  case name.downcase
-  when "gem", /^rubygems?$/ then <<-EOS.undent
-    Homebrew provides gem via: `brew install ruby`.
-    EOS
-  when "tex", "tex-live", "texlive", "latex" then <<-EOS.undent
-    Installing TeX from source is weird and gross, requires a lot of patches,
-    and only builds 32-bit (and thus can't use Homebrew dependencies)
-
-    We recommend using a MacTeX distribution: https://www.tug.org/mactex/
-
-    You can install it with Homebrew-Cask:
-      brew cask install mactex
-    EOS
-  when "pip" then <<-EOS.undent
-    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:
-      #{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`.
-    EOS
-  when "macruby" then <<-EOS.undent
-    MacRuby is not packaged and is on an indefinite development hiatus.
-    You can read more about it at:
-      #{Formatter.url("https://github.com/MacRuby/MacRuby")}
-    EOS
-  when /(lib)?lzma/
-    "lzma is now part of the xz formula."
-  when "gtest", "googletest", "google-test" then <<-EOS.undent
-    Installing gtest system-wide is not recommended; it should be vendored
-    in your projects that use it.
-    EOS
-  when "gmock", "googlemock", "google-mock" then <<-EOS.undent
-    Installing gmock system-wide is not recommended; it should be vendored
-    in your projects that use it.
-    EOS
-  when "sshpass" then <<-EOS.undent
-    We won't add sshpass because it makes it too easy for novice SSH users to
-    ruin SSH's security.
-    EOS
-  when "gsutil" then <<-EOS.undent
-    Install gsutil with `pip install gsutil`
-    EOS
-  when "clojure" then <<-EOS.undent
-    Clojure isn't really a program but a library managed as part of a
-    project and Leiningen is the user interface to that library.
-
-    To install Clojure you should install Leiningen:
-      brew install leiningen
-    and then follow the tutorial:
-      #{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
-    use the GitHub master branch instead.
-    EOS
-  when "gfortran" then <<-EOS.undent
-    GNU Fortran is now provided as part of GCC, and can be installed with:
-      brew install gcc
-    EOS
-  when "play" then <<-EOS.undent
-    Play 2.3 replaces the play command with activator:
-      brew install typesafe-activator
-
-    You can read more about this change at:
-      #{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
-    and cabal-install instead:
-      brew install ghc cabal-install
-
-    You can install with Homebrew-Cask:
-      brew cask install haskell-platform
-    EOS
-  when "mysqldump-secure" then <<-EOS.undent
-    The creator of mysqldump-secure tried to game our popularity metrics.
-    EOS
-  when "ngrok" then <<-EOS.undent
-    Upstream sunsetted 1.x in March 2016 and 2.x is not open-source.
-
-    If you wish to use the 2.x release you can install with Homebrew-Cask:
-      brew cask install ngrok
-    EOS
-  end
-end
-alias generic_blacklisted? blacklisted?
-
-require "extend/os/blacklist"
diff --git a/Library/Homebrew/cmd/info.rb b/Library/Homebrew/cmd/info.rb
index b7de0005c..7e1815556 100644
--- a/Library/Homebrew/cmd/info.rb
+++ b/Library/Homebrew/cmd/info.rb
@@ -16,7 +16,7 @@
 #:    See the docs for examples of using the JSON output:
 #:    <http://docs.brew.sh/Querying-Brew.html>
 
-require "blacklist"
+require "missing_formula"
 require "caveats"
 require "options"
 require "formula"
@@ -54,10 +54,13 @@ module Homebrew
           else
             info_formula Formulary.find_with_priority(f)
           end
-        rescue FormulaUnavailableError
-          # No formula with this name, try a blacklist lookup
-          raise unless (blacklist = blacklisted?(f))
-          puts blacklist
+        rescue FormulaUnavailableError => e
+          # No formula with this name, try a missing formula lookup
+          if (reason = Homebrew::MissingFormula.reason(f))
+            ofail "#{e.message}\n#{reason}"
+          else
+            ofail e.message
+          end
         end
       end
     end
diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index c825e2796..bd7897171 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -55,7 +55,7 @@
 #:    If `--git` is passed, Homebrew will create a Git repository, useful for
 #:    creating patches to the software.
 
-require "blacklist"
+require "missing_formula"
 require "diagnostic"
 require "cmd/search"
 require "formula_installer"
@@ -206,12 +206,13 @@ module Homebrew
       # formula was found, but there's a problem with its implementation).
       ofail e.message
     rescue FormulaUnavailableError => e
-      if (blacklist = blacklisted?(e.name))
-        ofail "#{e.message}\n#{blacklist}"
+      if (reason = Homebrew::MissingFormula.reason(e.name))
+        ofail "#{e.message}\n#{reason}"
       elsif e.name == "updog"
         ofail "What's updog?"
       else
         ofail e.message
+
         query = query_regexp(e.name)
 
         ohai "Searching for similarly named formulae..."
diff --git a/Library/Homebrew/cmd/log.rb b/Library/Homebrew/cmd/log.rb
index 22a3ee11d..9323c762d 100644
--- a/Library/Homebrew/cmd/log.rb
+++ b/Library/Homebrew/cmd/log.rb
@@ -9,20 +9,32 @@ module Homebrew
 
   def log
     if ARGV.named.empty?
-      cd HOMEBREW_REPOSITORY
-      git_log
+      git_log HOMEBREW_REPOSITORY
     else
       path = Formulary.path(ARGV.named.first)
-      cd path.dirname # supports taps
-      git_log path
+      tap = Tap.from_path(path)
+      git_log path.dirname, path, tap
     end
   end
 
-  def git_log(path = nil)
-    if File.exist? "#{`git rev-parse --show-toplevel`.chomp}/.git/shallow"
+  def git_log(cd_dir, path = nil, tap = nil)
+    cd cd_dir
+    repo = Utils.popen_read("git rev-parse --show-toplevel").chomp
+    if tap
+      name = tap.to_s
+      git_cd = "$(brew --repo #{tap})"
+    elsif cd_dir == HOMEBREW_REPOSITORY
+      name = "Homebrew/brew"
+      git_cd = "$(brew --repo)"
+    else
+      name, git_cd = cd_dir
+    end
+
+    if File.exist? "#{repo}/.git/shallow"
       opoo <<-EOS.undent
-        The git repository is a shallow clone therefore the filtering may be incorrect.
-        Use `git fetch --unshallow` to get the full repository.
+        #{name} is a shallow clone so only partial output will be shown.
+        To get a full clone run:
+          git -C "#{git_cd}" fetch --unshallow
       EOS
     end
     args = ARGV.options_only
diff --git a/Library/Homebrew/cmd/search.rb b/Library/Homebrew/cmd/search.rb
index e834a00b5..db5898872 100644
--- a/Library/Homebrew/cmd/search.rb
+++ b/Library/Homebrew/cmd/search.rb
@@ -14,7 +14,7 @@
 #:    Search for <text> in the given package manager's list.
 
 require "formula"
-require "blacklist"
+require "missing_formula"
 require "utils"
 require "thread"
 require "official_taps"
@@ -67,13 +67,12 @@ module Homebrew
       if $stdout.tty?
         count = local_results.length + tap_results.length
 
-        if msg = blacklisted?(query)
+        if reason = Homebrew::MissingFormula.reason(query)
           if count > 0
             puts
-            puts "If you meant #{query.inspect} precisely:"
-            puts
+            puts "If you meant #{query.inspect} specifically:"
           end
-          puts msg
+          puts reason
         elsif count.zero?
           puts "No formula found for #{query.inspect}."
           begin
diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 9c85539cd..9f296ca66 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -38,7 +38,7 @@ require "official_taps"
 require "cmd/search"
 require "cmd/style"
 require "date"
-require "blacklist"
+require "missing_formula"
 require "digest"
 
 module Homebrew
@@ -399,7 +399,7 @@ class FormulaAuditor
     name = formula.name
     full_name = formula.full_name
 
-    if blacklisted?(name)
+    if Homebrew::MissingFormula.blacklisted_reason(name)
       problem "'#{name}' is blacklisted."
     end
 
diff --git a/Library/Homebrew/dev-cmd/create.rb b/Library/Homebrew/dev-cmd/create.rb
index 9c58dc71a..6855d6f37 100644
--- a/Library/Homebrew/dev-cmd/create.rb
+++ b/Library/Homebrew/dev-cmd/create.rb
@@ -19,7 +19,7 @@
 #:    the specified tap.
 
 require "formula"
-require "blacklist"
+require "missing_formula"
 require "digest"
 require "erb"
 
@@ -73,8 +73,8 @@ module Homebrew
     # Don't allow blacklisted formula, or names that shadow aliases,
     # unless --force is specified.
     unless ARGV.force?
-      if msg = blacklisted?(fc.name)
-        raise "#{fc.name} is blacklisted for creation.\n#{msg}\nIf you really want to create this formula use --force."
+      if reason = Homebrew::MissingFormula.blacklisted_reason(fc.name)
+        raise "#{fc.name} is blacklisted for creation.\n#{reason}\nIf you really want to create this formula use --force."
       end
 
       if Formula.aliases.include? fc.name
diff --git a/Library/Homebrew/extend/os/blacklist.rb b/Library/Homebrew/extend/os/blacklist.rb
deleted file mode 100644
index 932040f82..000000000
--- a/Library/Homebrew/extend/os/blacklist.rb
+++ /dev/null
@@ -1,2 +0,0 @@
-require "blacklist"
-require "extend/os/mac/blacklist" if OS.mac?
diff --git a/Library/Homebrew/extend/os/mac/blacklist.rb b/Library/Homebrew/extend/os/mac/blacklist.rb
deleted file mode 100644
index edff4697e..000000000
--- a/Library/Homebrew/extend/os/mac/blacklist.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-def blacklisted?(name)
-  case name.downcase
-  when "xcode"
-    if MacOS.version >= :lion
-      <<-EOS.undent
-      Xcode can be installed from the App Store.
-      EOS
-    else
-      <<-EOS.undent
-      Xcode can be installed from https://developer.apple.com/xcode/downloads/
-      EOS
-    end
-  else
-    generic_blacklisted?(name)
-  end
-end
diff --git a/Library/Homebrew/extend/os/mac/missing_formula.rb b/Library/Homebrew/extend/os/mac/missing_formula.rb
new file mode 100644
index 000000000..48dfd2865
--- /dev/null
+++ b/Library/Homebrew/extend/os/mac/missing_formula.rb
@@ -0,0 +1,22 @@
+module Homebrew
+  module MissingFormula
+    class << self
+      def blacklisted_reason(name)
+        case name.downcase
+        when "xcode"
+          if MacOS.version >= :lion
+            <<-EOS.undent
+            Xcode can be installed from the App Store.
+            EOS
+          else
+            <<-EOS.undent
+            Xcode can be installed from #{Formatter.url("https://developer.apple.com/xcode/downloads/")}.
+            EOS
+          end
+        else
+          generic_blacklisted_reason(name)
+        end
+      end
+    end
+  end
+end
diff --git a/Library/Homebrew/extend/os/missing_formula.rb b/Library/Homebrew/extend/os/missing_formula.rb
new file mode 100644
index 000000000..02c59f4e4
--- /dev/null
+++ b/Library/Homebrew/extend/os/missing_formula.rb
@@ -0,0 +1,2 @@
+require "missing_formula"
+require "extend/os/mac/missing_formula" if OS.mac?
diff --git a/Library/Homebrew/missing_formula.rb b/Library/Homebrew/missing_formula.rb
new file mode 100644
index 000000000..ba09f7426
--- /dev/null
+++ b/Library/Homebrew/missing_formula.rb
@@ -0,0 +1,159 @@
+require "formulary"
+require "tap"
+require "utils"
+
+module Homebrew
+  module MissingFormula
+    class << self
+      def reason(name)
+        blacklisted_reason(name) || tap_migration_reason(name) || deleted_reason(name)
+      end
+
+      def blacklisted_reason(name)
+        case name.downcase
+        when "gem", /^rubygems?$/ then <<-EOS.undent
+          Homebrew provides gem via: `brew install ruby`.
+          EOS
+        when "tex", "tex-live", "texlive", "latex" then <<-EOS.undent
+          Installing TeX from source is weird and gross, requires a lot of patches,
+          and only builds 32-bit (and thus can't use Homebrew dependencies)
+
+          We recommend using a MacTeX distribution: https://www.tug.org/mactex/
+
+          You can install it with Homebrew-Cask:
+            brew cask install mactex
+          EOS
+        when "pip" then <<-EOS.undent
+          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:
+            #{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`.
+          EOS
+        when "macruby" then <<-EOS.undent
+          MacRuby is not packaged and is on an indefinite development hiatus.
+          You can read more about it at:
+            #{Formatter.url("https://github.com/MacRuby/MacRuby")}
+          EOS
+        when /(lib)?lzma/
+          "lzma is now part of the xz formula."
+        when "gtest", "googletest", "google-test" then <<-EOS.undent
+          Installing gtest system-wide is not recommended; it should be vendored
+          in your projects that use it.
+          EOS
+        when "gmock", "googlemock", "google-mock" then <<-EOS.undent
+          Installing gmock system-wide is not recommended; it should be vendored
+          in your projects that use it.
+          EOS
+        when "sshpass" then <<-EOS.undent
+          We won't add sshpass because it makes it too easy for novice SSH users to
+          ruin SSH's security.
+          EOS
+        when "gsutil" then <<-EOS.undent
+          Install gsutil with `pip install gsutil`
+          EOS
+        when "clojure" then <<-EOS.undent
+          Clojure isn't really a program but a library managed as part of a
+          project and Leiningen is the user interface to that library.
+
+          To install Clojure you should install Leiningen:
+            brew install leiningen
+          and then follow the tutorial:
+            #{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
+          use the GitHub master branch instead.
+          EOS
+        when "gfortran" then <<-EOS.undent
+          GNU Fortran is now provided as part of GCC, and can be installed with:
+            brew install gcc
+          EOS
+        when "play" then <<-EOS.undent
+          Play 2.3 replaces the play command with activator:
+            brew install typesafe-activator
+
+          You can read more about this change at:
+            #{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
+          and cabal-install instead:
+            brew install ghc cabal-install
+
+          You can install with Homebrew-Cask:
+            brew cask install haskell-platform
+          EOS
+        when "mysqldump-secure" then <<-EOS.undent
+          The creator of mysqldump-secure tried to game our popularity metrics.
+          EOS
+        when "ngrok" then <<-EOS.undent
+          Upstream sunsetted 1.x in March 2016 and 2.x is not open-source.
+
+          If you wish to use the 2.x release you can install with Homebrew-Cask:
+            brew cask install ngrok
+          EOS
+        end
+      end
+      alias generic_blacklisted_reason blacklisted_reason
+
+      def tap_migration_reason(name)
+        message = nil
+
+        Tap.each do |old_tap|
+          new_tap_name = old_tap.tap_migrations[name]
+          next unless new_tap_name
+          message = <<-EOS.undent
+            It was migrated from #{old_tap} to #{new_tap_name}.
+            You can access it again by running:
+              brew tap #{new_tap_name}
+          EOS
+          break
+        end
+
+        message
+      end
+
+      def deleted_reason(name)
+        path = Formulary.path name
+        return if File.exist? path
+        tap = Tap.from_path(path)
+        return unless File.exist? tap.path
+        relative_path = path.relative_path_from tap.path
+
+        tap.path.cd do
+          # We know this may return incomplete results for shallow clones but
+          # we don't want to nag everyone with a shallow clone to unshallow it.
+          log_command = "git log --name-only --max-count=1 --format=%H\\\\n%h\\\\n%B -- #{relative_path}"
+          hash, short_hash, *commit_message, relative_path =
+            Utils.popen_read(log_command).gsub("\\n", "\n").lines.map(&:chomp)
+          if hash.to_s.empty? || short_hash.to_s.empty? ||
+             relative_path.to_s.empty?
+            return
+          end
+
+          commit_message = commit_message.reject(&:empty?).join("\n  ")
+
+          commit_message.sub!(/ \(#(\d+)\)$/, " (#{tap.issues_url}/\\1)")
+          commit_message.gsub!(/(Closes|Fixes) #(\d+)/, "\\1 #{tap.issues_url}/\\2")
+
+          <<-EOS.undent
+            #{name} was deleted from #{tap.name} in commit #{short_hash}:
+              #{commit_message}
+
+            To show the formula before removal run:
+              git -C "$(brew --repo #{tap})" show #{short_hash}^:#{relative_path}
+
+            If you still use this formula consider creating your own tap:
+              http://docs.brew.sh/How-to-Create-and-Maintain-a-Tap.html
+          EOS
+        end
+      end
+
+      require "extend/os/missing_formula"
+    end
+  end
+end
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index ba55e3cf6..99138330b 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -41,6 +41,15 @@ class Tap
     CACHE.fetch(cache_key) { |key| CACHE[key] = Tap.new(user, repo) }
   end
 
+  def self.from_path(path)
+    path.to_s =~ HOMEBREW_TAP_PATH_REGEX
+    raise "Invalid tap path '#{path}'" unless $1
+    fetch($1, $2)
+  rescue
+    # No need to error as a nil tap is sufficient to show failure.
+    nil
+  end
+
   extend Enumerable
 
   # The user name of this {Tap}. Usually, it's the Github username of
diff --git a/Library/Homebrew/test/blacklist_spec.rb b/Library/Homebrew/test/blacklist_spec.rb
deleted file mode 100644
index 01882167d..000000000
--- a/Library/Homebrew/test/blacklist_spec.rb
+++ /dev/null
@@ -1,115 +0,0 @@
-require "blacklist"
-
-describe "Blacklist" do
-  matcher(:be_blacklisted) { match(&method(:blacklisted?)) }
-
-  context "rubygems" do
-    %w[gem rubygem rubygems].each do |s|
-      subject { s }
-
-      it { is_expected.to be_blacklisted }
-    end
-  end
-
-  context "latex" do
-    %w[latex tex tex-live texlive TexLive].each do |s|
-      subject { s }
-
-      it { is_expected.to be_blacklisted }
-    end
-  end
-
-  context "pip" do
-    subject { "pip" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "pil" do
-    subject { "pil" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "macruby" do
-    subject { "MacRuby" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "lzma" do
-    %w[lzma liblzma].each do |s|
-      subject { s }
-
-      it { is_expected.to be_blacklisted }
-    end
-  end
-
-  context "gtest" do
-    %w[gtest googletest google-test].each do |s|
-      subject { s }
-
-      it { is_expected.to be_blacklisted }
-    end
-  end
-
-  context "gmock" do
-    %w[gmock googlemock google-mock].each do |s|
-      subject { s }
-
-      it { is_expected.to be_blacklisted }
-    end
-  end
-
-  context "sshpass" do
-    subject { "sshpass" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "gsutil" do
-    subject { "gsutil" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "clojure" do
-    subject { "clojure" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "osmium" do
-    %w[osmium Osmium].each do |s|
-      subject { s }
-
-      it { is_expected.to be_blacklisted }
-    end
-  end
-
-  context "gfortran" do
-    subject { "gfortran" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "play" do
-    subject { "play" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "haskell-platform" do
-    subject { "haskell-platform" }
-
-    it { is_expected.to be_blacklisted }
-  end
-
-  context "xcode", :needs_macos do
-    %w[xcode Xcode].each do |s|
-      subject { s }
-
-      it { is_expected.to be_blacklisted }
-    end
-  end
-end
diff --git a/Library/Homebrew/test/cmd/log_spec.rb b/Library/Homebrew/test/cmd/log_spec.rb
index bdbca8912..b9e3e8d3e 100644
--- a/Library/Homebrew/test/cmd/log_spec.rb
+++ b/Library/Homebrew/test/cmd/log_spec.rb
@@ -33,7 +33,7 @@ describe "brew log", :integration_test do
 
     expect { brew "log", "#{shallow_tap}/testball" }
       .to output(/This is a test commit for Testball/).to_stdout
-      .and output(/Warning: The git repository is a shallow clone/).to_stderr
+      .and output(%r{Warning: homebrew/shallow is a shallow clone}).to_stderr
       .and be_a_success
 
     expect(shallow_tap.path/".git/shallow").to exist, "A shallow clone should have been created."
diff --git a/Library/Homebrew/test/missing_formula_spec.rb b/Library/Homebrew/test/missing_formula_spec.rb
new file mode 100644
index 000000000..f395965a6
--- /dev/null
+++ b/Library/Homebrew/test/missing_formula_spec.rb
@@ -0,0 +1,179 @@
+require "missing_formula"
+
+describe Homebrew::MissingFormula do
+  context "::reason" do
+    subject { described_class.reason("gem") }
+
+    it { is_expected.to_not be_nil }
+  end
+
+  context "::blacklisted_reason" do
+    matcher(:be_blacklisted) do
+      match(&Homebrew::MissingFormula.method(:blacklisted_reason))
+    end
+
+    context "rubygems" do
+      %w[gem rubygem rubygems].each do |s|
+        subject { s }
+
+        it { is_expected.to be_blacklisted }
+      end
+    end
+
+    context "latex" do
+      %w[latex tex tex-live texlive TexLive].each do |s|
+        subject { s }
+
+        it { is_expected.to be_blacklisted }
+      end
+    end
+
+    context "pip" do
+      subject { "pip" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "pil" do
+      subject { "pil" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "macruby" do
+      subject { "MacRuby" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "lzma" do
+      %w[lzma liblzma].each do |s|
+        subject { s }
+
+        it { is_expected.to be_blacklisted }
+      end
+    end
+
+    context "gtest" do
+      %w[gtest googletest google-test].each do |s|
+        subject { s }
+
+        it { is_expected.to be_blacklisted }
+      end
+    end
+
+    context "gmock" do
+      %w[gmock googlemock google-mock].each do |s|
+        subject { s }
+
+        it { is_expected.to be_blacklisted }
+      end
+    end
+
+    context "sshpass" do
+      subject { "sshpass" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "gsutil" do
+      subject { "gsutil" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "clojure" do
+      subject { "clojure" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "osmium" do
+      %w[osmium Osmium].each do |s|
+        subject { s }
+
+        it { is_expected.to be_blacklisted }
+      end
+    end
+
+    context "gfortran" do
+      subject { "gfortran" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "play" do
+      subject { "play" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "haskell-platform" do
+      subject { "haskell-platform" }
+
+      it { is_expected.to be_blacklisted }
+    end
+
+    context "xcode", :needs_macos do
+      %w[xcode Xcode].each do |s|
+        subject { s }
+
+        it { is_expected.to be_blacklisted }
+      end
+    end
+  end
+
+  context "::tap_migration_reason" do
+    subject { described_class.tap_migration_reason(formula) }
+
+    before do
+      Tap.clear_cache
+      tap_path = Tap::TAP_DIRECTORY/"homebrew/homebrew-foo"
+      tap_path.mkpath
+      (tap_path/"tap_migrations.json").write <<-EOS.undent
+        { "migrated-formula": "homebrew/bar" }
+      EOS
+    end
+
+    context "with a migrated formula" do
+      let(:formula) { "migrated-formula" }
+      it { is_expected.to_not be_nil }
+    end
+
+    context "with a missing formula" do
+      let(:formula) { "missing-formula" }
+      it { is_expected.to be_nil }
+    end
+  end
+
+  context "::deleted_reason" do
+    subject { described_class.deleted_reason(formula) }
+
+    before do
+      Tap.clear_cache
+      tap_path = Tap::TAP_DIRECTORY/"homebrew/homebrew-foo"
+      tap_path.mkpath
+      (tap_path/"deleted-formula.rb").write "placeholder"
+
+      tap_path.cd do
+        shutup do
+          system "git", "init"
+          system "git", "add", "--all"
+          system "git", "commit", "-m", "initial state"
+          system "git", "rm", "deleted-formula.rb"
+          system "git", "commit", "-m", "delete formula 'deleted-formula'"
+        end
+      end
+    end
+
+    context "with a deleted formula" do
+      let(:formula) { "homebrew/foo/deleted-formula" }
+      it { is_expected.to_not be_nil }
+    end
+
+    context "with a formula that never existed" do
+      let(:formula) { "homebrew/foo/missing-formula" }
+      it { is_expected.to be_nil }
+    end
+  end
+end