Clean the handling of --version argument, reusing the existing tools from optparse-applicative

src/Arguments.hs

@@ -9,17 +9,17 @@ module Arguments (
 import Data.Monoid ((<>))
 #endif
 import Control.Applicative ((<|>), (<**>), optional)
-import Options.Applicative (
-      Parser, ReadM, argument, auto, eitherReader, execParser, flag', fullDesc
-    , header, help, helper, info, long, metavar, short, str, switch, value
-  )
+import Options.Applicative
+  ( Parser, ReadM, argument, auto, eitherReader, execParser, flag', fullDesc
+  , header, help, helper, info, infoOption, long, metavar, short, str, switch
+  , value )
 import qualified Options.Applicative as Optparse (option)
 import System.FilePath (dropTrailingPathSeparator, isValid)
 
 version :: String
 version = "0.3.0.0"
 
-data Arguments = BlogConfig {
+data Arguments = Arguments {
       sourceDir :: FilePath
     , articlesPath :: Maybe FilePath
     , bannerPath :: Maybe FilePath
@@ -37,7 +37,6 @@ data Arguments = BlogConfig {
     , siteURL :: Maybe String
     , wording :: Maybe FilePath
   }
-  | Version
 
 option :: ReadM a -> Char -> String -> String -> String -> Parser (Maybe a)
 option readM aShort aLong aMetavar aHelpMessage =
@@ -49,8 +48,8 @@ option readM aShort aLong aMetavar aHelpMessage =
       <> help aHelpMessage
     )
 
-blogConfig :: Parser Arguments
-blogConfig = BlogConfig
+arguments :: Parser Arguments
+arguments = Arguments
   <$> argument filePath (value "." <> metavar "INPUT_DIR")
   <*> option filePath 'a' "articles" "DIRECTORY"
         "relative path to the directory containing the articles within INPUT_DIR"
@@ -83,16 +82,6 @@ blogConfig = BlogConfig
   <*> option filePath 'u' "site-url" "URL" "URL where the blog is published"
   <*> option filePath 'w' "wording" "FILE" "path to the file containing the wording to use"
 
-versionP :: Parser Arguments
-versionP = flag' Version (
-      long "version"
-    <> short 'v'
-    <> help "print the version number"
-  )
-
-arguments :: Parser Arguments
-arguments = blogConfig <|> versionP
-
 filePath :: ReadM FilePath
 filePath = eitherReader $ \path ->
   if isValid path
@@ -100,8 +89,10 @@ filePath = eitherReader $ \path ->
     else Left "This string doesn't represent a valid path"
 
 get :: IO Arguments
-get = do
-  execParser $
-    info
-      (arguments <**> helper)
-      (fullDesc <> header ("Hablo v" ++ version))
+get = execParser
+  (info (arguments <**> showVersion <**> helper)
+        (fullDesc <> header ("Hablo v" ++ version)))
+  where
+    showVersion = infoOption
+      version
+      (long "version" <> short 'v' <> help "print current version")

src/Main.hs

@@ -10,12 +10,7 @@ import qualified RSS (generate)
 import System.Exit (exitSuccess)
 
 main :: IO ()
-main = do
-  arguments <- Arguments.get
-  case arguments of
-    Version -> (putStrLn version) >> exitSuccess
-    config@(BlogConfig {}) -> Blog.build config >>= runReaderT (do
-        HTML.generate
-        JS.generate
-        RSS.generate
-      )
+main = Arguments.get >>= Blog.build >>= runReaderT
+  (do HTML.generate
+      JS.generate
+      RSS.generate)

src/TODO

@@ -1,4 +1,5 @@
 - dans Arguments.hs, vérifier que l'implémentation de option est pas déjà dans la lib optparse-applicative
+		=> ah non en fait c'est une fonction locale au fichier juste mal nommée, corriger ça
 - le Wording, c'était quand même pas l'idée du siècle -> ça pourrait pas tout revenir dans un thème qui serait du HTML ?
 - faque Template aussi
 - «Pretty» Oo ? mais c'est juste des Utils en fait