Merge pull request #2861 from reitermarkus/cask-search-tty

Output plain list when running `brew cask search` without a TTY.

1 files changed, 84 insertions, 0 deletions

diff --git a/Library/Homebrew/test/support/helper/output_as_tty.rb b/Library/Homebrew/test/support/helper/output_as_tty.rb
new file mode 100644
index 000000000..aa9da73cc
--- /dev/null
+++ b/Library/Homebrew/test/support/helper/output_as_tty.rb
@@ -0,0 +1,84 @@
+require "delegate"
+
+module Test
+  module Helper
+    module OutputAsTTY
+      # This is a custom wrapper for the `output` matcher,
+      # used for testing output to a TTY:
+      #
+      #   expect {
+      #     print "test" if $stdout.tty?
+      #   }.to output("test").to_stdout.as_tty
+      #
+      #   expect {
+      #     # command
+      #   }.to output(...).to_stderr.as_tty.with_color
+      #
+      class Output < SimpleDelegator
+        def matches?(block)
+          return super(block) unless @tty
+
+          colored_tty_block = lambda do
+            instance_eval("$#{@output}").extend(Module.new do
+              def tty?
+                true
+              end
+
+              alias_method :isatty, :tty?
+            end)
+            block.call
+          end
+
+          return super(colored_tty_block) if @colors
+
+          uncolored_tty_block = lambda do
+            instance_eval <<-EOS
+              begin
+                captured_stream = StringIO.new
+
+                original_stream = $#{@output}
+                $#{@output} = captured_stream
+
+                colored_tty_block.call
+              ensure
+                $#{@output} = original_stream
+                $#{@output}.print Tty.strip_ansi(captured_stream.string)
+              end
+            EOS
+          end
+
+          super(uncolored_tty_block)
+        end
+
+        def to_stdout
+          @output = :stdout
+          super
+          self
+        end
+
+        def to_stderr
+          @output = :stderr
+          super
+          self
+        end
+
+        def as_tty
+          @tty = true
+          return self if [:stdout, :stderr].include?(@output)
+          raise "`as_tty` can only be chained to `stdout` or `stderr`."
+        end
+
+        def with_color
+          @colors = true
+          return self if @tty
+          raise "`with_color` can only be chained to `as_tty`."
+        end
+      end
+
+      def output(*args)
+        core_matcher = super(*args)
+        Output.new(core_matcher)
+      end
+    end
+  end
+end