gnu-indent: remove default-names option

Formula/gnu-indent.rb

@@ -13,10 +13,6 @@ class GnuIndent < Formula
     sha256 "d31ad8b842092150f18dd706d369a0fa6db7fbb41302247eac601c97785218af" => :el_capitan
   end
 
-  option "with-default-names", "Do not prepend 'g' to the binary"
-
-  deprecated_option "default-names" => "with-default-names"
-
   depends_on "gettext"
 
   def install
@@ -25,17 +21,28 @@ class GnuIndent < Formula
       --disable-dependency-tracking
       --prefix=#{prefix}
       --mandir=#{man}
+      --program-prefix=g
     ]
 
-    args << "--program-prefix=g" if build.without? "default-names"
-
     system "./configure", *args
     system "make", "install"
 
-    if build.without? "default-names"
-      (libexec/"gnubin").install_symlink bin/"gindent" => "indent"
-      (libexec/"gnuman/man1").install_symlink man1/"gindent.1" => "indent.1"
-    end
+    (libexec/"gnubin").install_symlink bin/"gindent" => "indent"
+    (libexec/"gnuman/man1").install_symlink man1/"gindent.1" => "indent.1"
+  end
+
+  def caveats; <<~EOS
+    GNU "indent" has been installed as "gindent".
+    If you need to use it as "indent", you can add a "gnubin" directory
+    to your PATH from your bashrc like:
+
+        PATH="#{opt_libexec}/gnubin:$PATH"
+
+    Additionally, you can access its man page with normal name if you add
+    the "gnuman" directory to your MANPATH from your bashrc as well:
+
+        MANPATH="#{opt_libexec}/gnuman:$MANPATH"
+  EOS
   end
 
   test do