add brew tap-info

Library/Homebrew/cmd/tap-info.rb

@@ -0,0 +1,59 @@
+require "cmd/tap"
+
+module Homebrew
+  def tap_info
+    if ARGV.include? "--installed"
+      taps = Tap
+    else
+      taps = ARGV.named.map do |name|
+        Tap.new(*tap_args(name))
+      end
+    end
+
+    if ARGV.json == "v1"
+      print_tap_json(taps)
+    else
+      print_tap_info(taps)
+    end
+  end
+
+  private
+
+  def print_tap_info(taps)
+    if taps.none?
+      tap_count = 0
+      formula_count = 0
+      command_count = 0
+      Tap.each do |tap|
+        tap_count += 1
+        formula_count += tap.formula_files.size
+        command_count += tap.command_files.size
+      end
+      info = "#{tap_count} tap#{plural(tap_count)}"
+      info += ", #{formula_count} formula#{plural(formula_count, "e")}"
+      info += ", #{command_count} command#{plural(command_count)}"
+      info += ", #{Tap::TAP_DIRECTORY.abv}" if Tap::TAP_DIRECTORY.directory?
+      puts info
+    else
+      taps.each_with_index do |tap, i|
+        puts unless i == 0
+        info = "#{tap}: "
+        if tap.installed?
+          formula_count = tap.formula_files.size
+          info += "#{formula_count} formula#{plural(formula_count, "e")} " if formula_count > 0
+          command_count = tap.command_files.size
+          info += "#{command_count} command#{plural(command_count)} " if command_count > 0
+          info += "\n#{tap.path} (#{tap.path.abv})"
+        else
+          info += "Not installed"
+        end
+        puts info
+        puts "From: #{tap.remote}"
+      end
+    end
+  end
+
+  def print_tap_json(taps)
+    puts Utils::JSON.dump(taps.map(&:to_hash))
+  end
+end