Address style issues related to use of Dir[]

Formula/isc-dhcp.rb

@@ -55,10 +55,10 @@ class IscDhcp < Formula
 
     # rename all the installed sample etc/* files so they don't clobber
     # any existing config files at symlink time.
-    Dir.open(prefix+'etc') do |dir|
+    Dir.open("#{prefix}/etc") do |dir|
       dir.each do |f|
         file = "#{dir.path}/#{f}"
-        File.rename(file, "#{file}.sample") if File.stat(file).file?
+        File.rename(file, "#{file}.sample") if File.file?(file)
       end
     end
 

Formula/play.rb

@@ -10,11 +10,7 @@ class Play < Formula
 
   def install
     system "./framework/build", "publish-local" if build.head?
-
-    # remove Windows .bat files
-    rm Dir['*.bat']
-    rm Dir["#{buildpath}/**/*.bat"] if build.head?
-
+    rm_rf Dir["**/*.bat"]
     libexec.install Dir['*']
     bin.install_symlink libexec/'play'
   end

Formula/salt.rb

@@ -24,7 +24,7 @@ class Salt < Formula
     ENV.deparallelize
     # the libgfortran.a path needs to be set explicitly
     libgfortran = `$FC --print-file-name libgfortran.a`.chomp
-    ENV.append 'LDFLAGS', "-L#{File.dirname libgfortran} -lgfortran"
+    ENV.append 'LDFLAGS', "-L#{File.dirname(libgfortran)} -lgfortran"
     system "./configure", "--prefix=#{prefix}", "--disable-static"
     system "make install"
     # install all the model data
@@ -35,7 +35,7 @@ class Salt < Formula
 
   test do
     ENV['SALTPATH'] = "#{prefix}/data"
-    cp_r Dir[prefix + '03d4ag' + '*'], '.'
+    cp_r Dir["#{prefix}/03d4ag*"], '.'
     system bin/"snfit", testpath/"lc-03D4ag.list"
     assert File.exist?("result_salt2.dat")
   end

Formula/sbcl.rb

@@ -84,8 +84,8 @@ class Sbcl < Formula
     bootstrap = (build.build_32_bit? || !MacOS.prefer_64_bit?) ? "bootstrap32" : "bootstrap64"
     resource(bootstrap).stage do
       # We only need the binaries for bootstrapping, so don't install anything:
-      command = Dir.pwd + "/src/runtime/sbcl"
-      core = Dir.pwd + "/output/sbcl.core"
+      command = "#{Dir.pwd}/src/runtime/sbcl"
+      core = "#{Dir.pwd}/output/sbcl.core"
       xc_cmdline = "#{command} --core #{core} --disable-debugger --no-userinit --no-sysinit"
 
       cd buildpath do

Formula/sleepwatcher.rb

@@ -48,7 +48,7 @@ class Sleepwatcher < Formula
     but read information regarding setup of the launchd files which
     are installed here:
 
-      #{Dir[(prefix + '*.plist')].join("\n      ")}
+      #{Dir["#{prefix}/*.plist"].join("\n      ")}
 
     These are the examples provided by the author.
     EOS

Formula/typesafe-activator.rb

@@ -6,12 +6,8 @@ class TypesafeActivator < Formula
   sha1 '01accd921068a4f8dae4a6304aa98f837b110602'
 
   def install
-    # remove Windows .bat files
-    rm Dir['*.bat']
-    rm Dir["#{buildpath}/**/*.bat"]
-
+    rm Dir["*.bat"] # Remove Windows .bat files
     prefix.install_metafiles
-
     libexec.install Dir['*']
     bin.write_exec_script libexec/'activator'
   end

Formula/uru.rb

@@ -9,7 +9,7 @@ class Uru < Formula
 
   def install
     ENV["GOPATH"] = buildpath
-    (buildpath/"src/bitbucket.org/jonforums/uru").install Dir[buildpath/"*"]
+    (buildpath/"src/bitbucket.org/jonforums/uru").install Dir["*"]
     system "go", "build", "-ldflags", "-s", "bitbucket.org/jonforums/uru"
     bin.install "uru" => "uru_rt"
   end