Rewrite command-line parsing to use cmdargs.

[hath.git] / src / Main.hs

diff --git a/src/Main.hs b/src/Main.hs
index 5afadcdfbc80e80fb1b4a2213afacce6fc836809..45705be673f087d76d8e64ea61f16c086ac98632 100644 (file)
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -2,12 +2,12 @@ module Main
 where
 
 import Control.Concurrent.ParallelIO.Global ( stopGlobalPool )
-import Control.Monad (unless, when)
+import Control.Monad (when)
 import qualified Data.ByteString.Char8 as BS (intercalate, pack, unpack)
 import Data.List ((\\), intercalate)
 import Data.Maybe (catMaybes, isNothing)
 import Data.String.Utils (splitWs)
-import System.Exit (ExitCode(..), exitSuccess, exitWith)
+import System.Exit (ExitCode(..), exitWith)
 import System.IO (stderr, hPutStrLn)
 import Text.Read (readMaybe)
 
@@ -23,15 +23,9 @@ import Cidr (
   min_octet2,
   min_octet3,
   min_octet4 )
-import CommandLine (
-  help_set,
-  help_text,
-  input_function,
-  Mode(..),
-  parse_errors,
-  parse_mode )
+import CommandLine (Args(..), get_args)
 import DNS (Domain, PTRResult, lookup_ptrs)
-import ExitCodes ( exit_args_parse_failed, exit_invalid_cidr )
+import ExitCodes ( exit_invalid_cidr )
 import Octet ()
 
 
@@ -43,8 +37,8 @@ non_addr_char = "[^\\.0-9]"
 -- | Add non_addr_chars on either side of the given String. This
 --   prevents (for example) the regex '127.0.0.1' from matching
 --   '127.0.0.100'.
-addr_barrier :: String -> String
-addr_barrier x = non_addr_char ++ x ++ non_addr_char
+add_barriers :: String -> String
+add_barriers x = non_addr_char ++ x ++ non_addr_char
 
 
 -- | The magic happens here. We take a CIDR String as an argument, and
@@ -57,9 +51,10 @@ addr_barrier x = non_addr_char ++ x ++ non_addr_char
 --   4. Join the regexes from step 3 with regexes matching periods.
 --   5. Stick an address boundary on either side of the result.
 --
-cidr_to_regex :: Cidr.Cidr -> String
-cidr_to_regex cidr =
-    addr_barrier (intercalate "\\." [range1, range2, range3, range4])
+cidr_to_regex :: Bool -> Cidr.Cidr -> String
+cidr_to_regex use_barriers cidr =
+    let f = if use_barriers then add_barriers else id in
+      f (intercalate "\\." [range1, range2, range3, range4])
     where
       range1 = numeric_range min1 max1
       range2 = numeric_range min2 max2
@@ -94,49 +89,40 @@ numeric_range x y =
 
 main :: IO ()
 main = do
-  -- First, check for any errors that occurred while parsing
-  -- the command line options.
-  errors <- CommandLine.parse_errors
-  unless (null errors) $ do
-    hPutStrLn stderr (concat errors)
-    putStrLn CommandLine.help_text
-    exitWith (ExitFailure exit_args_parse_failed)
-
-  -- Next, check to see if the 'help' option was passed to the
-  -- program. If it was, display the help, and exit successfully.
-  help_opt_set <- CommandLine.help_set
-  when help_opt_set $ do
-    putStrLn CommandLine.help_text
-    exitSuccess
-
-  -- The input function we receive here should know what to read.
-  inputfunc <- (CommandLine.input_function)
-  input <- inputfunc
+  args <- get_args
+
+  -- This reads stdin.
+  input <- getContents
 
   let cidr_strings = splitWs input
   let cidrs = map readMaybe cidr_strings
 
   when (any isNothing cidrs) $ do
-    putStrLn "Error: not valid CIDR notation."
+    hPutStrLn stderr "ERROR: not valid CIDR notation:"
+
+    -- Output the bad lines, safely.
+    let pairs = zip cidr_strings cidrs
+    let print_pair (x, Nothing) = hPutStrLn stderr ("  * " ++ x)
+        print_pair (_, _) = return ()
+
+    mapM_ print_pair pairs
     exitWith (ExitFailure exit_invalid_cidr)
 
   -- Filter out only the valid ones.
   let valid_cidrs = catMaybes cidrs
 
-  -- Get the mode of operation.
-  mode <- CommandLine.parse_mode
-
-  case mode of
-    Regex -> do
-      let regexes = map cidr_to_regex valid_cidrs
+  case args of
+    Regexed{} -> do
+      let cidrs' = combine_all valid_cidrs
+      let regexes = map (cidr_to_regex (barriers args)) cidrs'
       putStrLn $ alternate regexes
-    Reduce ->
+    Reduced{} ->
       mapM_ print (combine_all valid_cidrs)
-    Dupe ->
+    Duped{} ->
        mapM_ print dupes
        where
          dupes = valid_cidrs \\ (combine_all valid_cidrs)
-    Diff -> do
+    Diffed{} -> do
        mapM_ putStrLn deletions
        mapM_ putStrLn additions
        where
@@ -144,11 +130,11 @@ main = do
          deletions = map (\s -> '-' : (show s)) dupes
          newcidrs = (combine_all valid_cidrs) \\ valid_cidrs
          additions = map (\s -> '+' : (show s)) newcidrs
-    List -> do
+    Listed{} -> do
       let combined_cidrs = combine_all valid_cidrs
       let addrs = concatMap enumerate combined_cidrs
       mapM_ print addrs
-    Reverse -> do
+    Reversed{} -> do
       let combined_cidrs = combine_all valid_cidrs
       let addrs = concatMap enumerate combined_cidrs
       let addr_bytestrings = map (BS.pack . show) addrs