Stubbing out dmc cli

TODO.md

@@ -1,9 +1,11 @@
 # todo
 
 ## mvp
-1. DMC
+1. `dmc`
+2. Follow up on [#234](https://github.com/pcapriotti/optparse-applicative/pull/234) to remove '--'
+3. MORE TESTS for dm/dmc runtime
 
 ## later
-0. --local flag to execute on local machine instead of docker-machine targets
-1. Use monad transformer to stack Sh on top of Either (error transformer)
+0. `--local` flag to execute on local machine instead of docker-machine targets
+1. Use monad transformer to stack `Sh` on top of `Either` (error transformer)
 2. Read up on exception handling link in haskell-fun-times resources

app/Dmc.hs

@@ -0,0 +1,82 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ExtendedDefaultRules #-}
+{-# OPTIONS_GHC -fno-warn-type-defaults #-}
+module Main where
+
+-- Local packages
+import Dockmaster
+
+-- External packages
+import Shelly hiding (command)
+import Options.Applicative
+
+-- Base packages
+import Prelude hiding (FilePath)
+import Data.Monoid ((<>))
+import qualified Data.Text as T
+
+default (T.Text)
+
+-- | Represents cli options/arguments
+data Dmc
+  = Set     SetOptions
+  | Get     GetOptions
+  | Unshift SetOptions
+  | Shift   GetOptions
+  | Push    SetOptions
+  | Pop     GetOptions
+  deriving (Eq, Show)
+
+-- | Arguments necessary for setting value
+data SetOptions = SetOptions
+  { sName  :: String
+  , sValue :: String
+  } deriving (Eq, Show)
+
+-- | Arguments necessary for getting value or shifting/popping array
+data GetOptions = GetOptions
+  { gName  :: String
+  } deriving (Eq, Show)
+
+-- | Main runtime
+main :: IO ()
+main = execParser opts >>= shelly . runtime 
+
+-- | Runtime shell execution
+runtime :: Dmc -> Sh ()
+runtime opts = undefined
+
+-- | Parser for /set/ commands
+setOptions :: Parser SetOptions
+setOptions = SetOptions
+  <$> argument str (metavar "NAME" <> help "Name of the setting to modify")
+  <*> argument str (metavar "VALUE" <> help "Value to add/set")
+
+-- | Parser for /get/ commands
+getOptions :: Parser GetOptions
+getOptions = GetOptions
+  <$> argument str (metavar "NAME" <> help "Name of the setting to retrieve")
+
+-- | Parser for 'Dmc'.
+parser :: Parser Dmc
+parser = subparser
+  (  (command "set" $ commandInfo (Set <$> setOptions) "Set value")
+  <> (command "get" $ commandInfo (Get <$> getOptions) "Get value")
+  <> (command "unshift" $ commandInfo (Unshift <$> setOptions) "Unshift value (for arrays)")
+  <> (command "shift" $ commandInfo (Shift <$> getOptions) "Shift value (for arrays)")
+  <> (command "push" $ commandInfo (Push <$> setOptions) "Push value (for arrays)")
+  <> (command "pop" $ commandInfo (Pop <$> getOptions) "Pop value (for arrays)")
+  ) 
+
+-- | Generate 'ParserInfo' for 'Dmc'.
+opts :: ParserInfo Dmc
+opts = info (helper <*> parser)
+  (  fullDesc
+  <> header "dmc - dockmaster configuration modifiers"
+  )
+
+-- | Helper to generate subcommand parser info
+commandInfo :: Parser Dmc -> String -> ParserInfo Dmc
+commandInfo opts desc = info
+  (helper <*> opts)
+  (fullDesc <> progDesc desc)

dockmaster.cabal

@@ -49,6 +49,17 @@ executable dm
                      , optparse-applicative
   default-language:    Haskell2010
 
+executable dmc
+  hs-source-dirs:      app
+  main-is:             Dmc.hs
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  build-depends:       base
+                     , dockmaster
+                     , shelly
+                     , text
+                     , optparse-applicative
+  default-language:    Haskell2010
+
 test-suite dockmaster-test
   type:                exitcode-stdio-1.0
   hs-source-dirs:      test