X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FCommandLine.hs;h=181eb6f01be210605058a1d51e6e246af210c063;hb=refs%2Ftags%2F0.0.3;hp=eba70dbbe87fcbe8fb2b86e0bdaea3ce66663cc1;hpb=60c61e5eb68575f723beac12fc3162ab30557953;p=hath.git diff --git a/src/CommandLine.hs b/src/CommandLine.hs index eba70db..181eb6f 100644 --- a/src/CommandLine.hs +++ b/src/CommandLine.hs @@ -6,93 +6,138 @@ module CommandLine ( help_set, help_text, input_function, - parse_errors + Mode(..), + parse_errors, + parse_mode ) where +import Data.Char(toLower) import System.Console.GetOpt import System.Environment (getArgs) --- A record containing values for all available options. +-- | Lowercase an entire string. +lowercase :: String -> String +lowercase = map toLower + + +-- | The application currently has four modes. The default, Regex, +-- will compute a regular expression matching the input +-- CIDRs. Reduce, on the other hand, will combine any +-- redundant/adjacent CIDR blocks into one. Dupe will show you what +-- would be removed by Reduce, and Diff will show both additions and +-- deletions in a diff-like format. +data Mode = Regex | Reduce | Dupe | Diff + + +-- | A record containing values for all available options. data Options = Options { opt_help :: Bool, opt_input :: IO String } --- This constructs an instance of Options, with each of its members --- set to default values. + +-- | This constructs an instance of Options, with each of its members +-- set to default values. default_options :: Options default_options = Options { opt_help = False, opt_input = getContents } --- The options list that we construct associates a function with each --- option. This function is responsible for updating an Options record --- with the appropriate value. +-- | The options list that we construct associates a function with +-- each option. This function is responsible for updating an Options +-- record with the appropriate value. -- --- For more information and an example of this idiom, see, +-- For more information and an example of this idiom, see, -- --- http://www.haskell.org/haskellwiki/High-level_option_handling_with_GetOpt +-- http://www.haskell.org/haskellwiki/High-level_option_handling_with_GetOpt -- options :: [OptDescr (Options -> IO Options)] options = - [ Option ['h'][] (NoArg set_help) "Prints this help message.", - Option ['i'][] (ReqArg set_input "FILE") "Read FILE instead of stdin." ] + [ Option "h" ["help"] (NoArg set_help) "Prints this help message.", + Option "i" ["input"] (ReqArg set_input "FILE") "Read FILE instead of stdin." ] --- Takes an Options as an argument, and sets its opt_help member to --- True. +-- | Takes an Options as an argument, and sets its opt_help member to +-- True. set_help :: Options -> IO Options -set_help opts = do +set_help opts = return opts { opt_help = True } --- If the input file option is set, this function will update the --- passed Options record with a new function for opt_input. The --- default opt_input is to read from stdin, but if this option is set, --- we replace that with readFile. + +-- | If the input file option is set, this function will update the +-- passed Options record with a new function for opt_input. The +-- default opt_input is to read from stdin, but if this option is +-- set, we replace that with readFile. set_input :: String -> Options -> IO Options -set_input arg opts = do +set_input arg opts = return opts { opt_input = readFile arg } --- The usage header + +-- | The usage header. usage :: String -usage = "Usage: hath [-h] [-i FILE]" +usage = "Usage: hath [regexed|reduced|duped|diffed] [-h] [-i FILE] " --- The usage header, and all available flags (as generated by GetOpt) +-- | The usage header, and all available flags (as generated by GetOpt). help_text :: String help_text = usageInfo usage options --- Return a tuple of options and errors. -parse_options :: IO (Options, [String]) +-- | Return a list of options. +parse_options :: IO Options parse_options = do argv <- getArgs - let (actions, _, errors) = getOpt Permute options argv + let (actions, _, _) = getOpt Permute options argv -- This will execute each of the functions contained in our options -- list, one after another, on a default_options record. The end -- result should be an Options instance with all of its members set -- correctly. - opts <- foldl (>>=) (return default_options) actions + foldl (>>=) (return default_options) actions - return (opts, errors) --- Return just the errors from parse_options. +-- | Return the mode if one was given. +parse_mode :: IO Mode +parse_mode = do + argv <- getArgs + let (_, non_options, _) = getOpt Permute options argv + case non_options of + -- Default + [] -> return Regex + -- Some non-option was given, but were any of them modes? + (x:_) -> + case (lowercase x) of + "regex" -> return Regex + "regexed" -> return Regex + "reduce" -> return Reduce + "reduced" -> return Reduce + "dupe" -> return Dupe + "duped" -> return Dupe + "diff" -> return Diff + "diffed" -> return Diff + _ -> return Regex + + + + +-- | Return a list of errors. parse_errors :: IO [String] parse_errors = do - (_, errors) <- parse_options - return errors + argv <- getArgs + let (_, _, errors) = getOpt Permute options argv + return errors + --- Is the help option set? +-- | Is the help option set? help_set :: IO Bool help_set = do - (opts, _) <- parse_options + opts <- parse_options return (opt_help opts) --- Return our input function, getContents by default, or readFile if --- the input file option was set. +-- | Return our input function, getContents by default, or readFile if +-- the input file option was set. input_function :: IO (IO String) input_function = do - (opts, _) <- parse_options + opts <- parse_options return (opt_input opts)