From: Michael Orlitzky <michael@orlitzky.com>
Date: Fri, 17 Jul 2015 05:18:17 +0000 (-0400)
Subject: Add Default and Ord instances for Weight.
X-Git-Url: http://gitweb.michael.orlitzky.com/?p=dead%2Fharbl.git;a=commitdiff_plain;h=6eb7fe0f53b0d8690a821cce9257b8b1a17fdaad

Add Default and Ord instances for Weight.
---

diff --git a/harbl.cabal b/harbl.cabal
index a970d30..e59c437 100644
--- a/harbl.cabal
+++ b/harbl.cabal
@@ -17,6 +17,7 @@ library
   build-depends:
     base                        >= 4.6 && < 5,
     bytestring                  >= 0.9,
+    cmdargs                     >= 0.10.6,
     dns                         >= 2,
     iproute                     >= 1.4,
     parsec                      >= 3,
@@ -80,6 +81,8 @@ executable harbl
 
   hs-source-dirs: harbl-cli/src
 
+  -- Other modules needed...
+
   ghc-options:
     -Wall
     -fwarn-hi-shadowing
diff --git a/harbl/src/Network/DNS/RBL/Weight.hs b/harbl/src/Network/DNS/RBL/Weight.hs
index e56bcd0..8447ab3 100644
--- a/harbl/src/Network/DNS/RBL/Weight.hs
+++ b/harbl/src/Network/DNS/RBL/Weight.hs
@@ -15,6 +15,7 @@ module Network.DNS.RBL.Weight (
   weight )
 where
 
+import System.Console.CmdArgs.Default ( Default(..) )
 import Text.Parsec (
   (<|>),
   char,
@@ -47,7 +48,7 @@ import Network.DNS.RBL.Pretty ( Pretty(..) )
 --   >>> sum [w1, w2, w3]
 --   Weight 4
 --
-newtype Weight = Weight Int deriving (Eq, Num, Show)
+newtype Weight = Weight Int deriving (Eq, Num, Ord, Show)
 
 
 -- | Pretty-print a 'Weight'. This just shows/prints the underlying 'Int'.
@@ -61,6 +62,18 @@ instance Pretty Weight where
   pretty_show (Weight w) = show w
 
 
+-- | Set a default value for the weight. We use the 'Default' class
+--   from the CmdArgs class so that 'Weight's can be easily parsed on
+--   the command-line.
+--
+--   ==== _Examples_
+--
+--   >>> def :: Weight
+--   Weight 1
+--
+instance Default Weight where def = 1
+
+
 -- | Parse the weight multiplier off the end of an input 'Site'. This
 --   expects there to be a \"multiplier\" character (an asterisk)
 --   before the integral weight.