diff --git a/Library/Homebrew/cmd/extract.rb b/Library/Homebrew/cmd/extract.rb
new file mode 100644
index 0000000000..440d77faba
--- /dev/null
+++ b/Library/Homebrew/cmd/extract.rb
@@ -0,0 +1,53 @@
+#:  * `extract` <formula> <version> <tap>:
+#:    Looks through repository history to find the <version> of <formula> and
+#:    creates a copy in <tap>/Formula/<formula>@<version>.rb. If the tap is
+#:    not installed yet, attempts to install/clone the tap before continuing.
+#:
+#:    If the file at <tap>/Formula/<formula>@<version>.rb already exists,
+#:    it will not be overwritten unless `--force` is specified.
+#:
+
+require "utils/git"
+require "formula_versions"
+require "formulary"
+require "tap"
+
+module Homebrew
+  module_function
+
+  def extract
+    formula = Formulary.factory(ARGV.named[0])
+    version = ARGV.named[1]
+    dest = Tap.fetch(ARGV.named[2])
+    dest.install unless dest.installed?
+    path = Pathname.new("#{dest.path}/Formula/#{formula}@#{version}.rb")
+    if path.exist?
+      unless ARGV.force?
+        odie <<~EOS
+          Destination formula already exists: #{path}
+          To overwrite it and continue anyways, run `brew extract #{formula} #{version} #{dest.name} --force`.
+        EOS
+      end
+      ohai "Clobbering existing formula at #{path}" if ARGV.debug?
+      path.delete
+    end
+
+    rev = "HEAD"
+    version_resolver = FormulaVersions.new(formula)
+    rev = Git.last_revision_commit_of_file(formula.path.parent.parent, formula.path, before_commit: "#{rev}~1") until version_resolver.formula_at_revision(rev) { |f| version_matches?(f, version, rev) || rev.empty? }
+
+    odie "Could not find #{formula} #{version}." if rev.empty?
+
+    result = version_resolver.file_contents_at_revision(rev)
+    ohai "Writing formula for #{formula} from #{rev} to #{path}"
+
+    # The class name has to be renamed to match the new filename, e.g. Foo version 1.2.3 becomes FooAT123 and resides in Foo@1.2.3.rb.
+    path.write result.gsub("class #{formula.name.capitalize} < Formula", "class #{formula.name.capitalize}AT#{version.gsub(/[^0-9a-z ]/i, "")} < Formula")
+  end
+
+  # @private
+  def version_matches?(formula, version, rev)
+    ohai "Trying #{formula.version} from revision #{rev} against desired #{version}" if ARGV.debug?
+    formula.version == version
+  end
+end