Normalize CLI options and help display

README.md

@@ -74,17 +74,17 @@ tricu eval [OPTIONS]
   Evaluate a file and return the result of the expression in the final line
 
   -f --file=FILE      Optional input file path for evaluation.
-                      Defaults to stdin.
+                        Defaults to stdin.
   -o --output=OUTPUT  Optional output file path for resulting output.
-                      Defaults to stdout.
+                        Defaults to stdout.
   -t --form=FORM      Optional output form: (fsl|tree|ast|ternary|ascii).
-                      Defaults to fsl.
+                        Defaults to fsl.
 
 tricu decode [OPTIONS]
   Decode a Tree Calculus value into a string representation
 
-  -f --input=ITEM     Optional file path to attempt decoding.
-                      Defaults to stdin.
+  -f --file=FILE      Optional input file path to attempt decoding.
+                        Defaults to stdin.
 ```
 
 ## Acknowledgements 

src/Main.hs

@@ -14,8 +14,10 @@ import qualified Data.Map as Map
 
 data TricuArgs
   = Repl
-  | Evaluate { file :: Maybe FilePath, output :: Maybe FilePath, form :: EvaluatedForm }
-  | Decode { input :: Maybe FilePath }
+  | Evaluate { file :: Maybe FilePath
+             , output :: Maybe FilePath
+             , form :: EvaluatedForm }
+  | Decode   { file :: Maybe FilePath }
   deriving (Show, Data, Typeable)
 
 replMode :: TricuArgs
@@ -27,11 +29,16 @@ replMode = Repl
 evaluateMode :: TricuArgs
 evaluateMode = Evaluate 
   { file = def &= typ "FILE" 
-      &= help "Optional input file path for evaluation.\nDefaults to stdin." &= name "f"
+      &= help "Optional input file path for evaluation.\n \
+             \ Defaults to stdin." 
+      &= name "f"
   , output = def &= typ "OUTPUT" 
-      &= help "Optional output file path for resulting output.\nDefaults to stdout." &= name "o"
+      &= help "Optional output file path for resulting output.\n \
+             \ Defaults to stdout." 
+      &= name "o"
   , form = FSL &= typ "FORM" 
-      &= help "Optional output form: (fsl|tree|ast|ternary|ascii).\nDefaults to fsl." 
+      &= help "Optional output form: (fsl|tree|ast|ternary|ascii).\n \
+             \ Defaults to fsl." 
       &= name "t"
   }
   &= help "Evaluate a file and return the result of the expression in the final line"
@@ -40,8 +47,11 @@ evaluateMode = Evaluate
 
 decodeMode :: TricuArgs
 decodeMode = Decode
-  { input = def &= typ "FILE"
-            &= help "Optional file path to attempt decoding.\nDefaults to stdin." &= name "f"
+  { file = def 
+      &= help "Optional input file path to attempt decoding.\n \
+             \ Defaults to stdin." 
+      &= name "f" 
+      &= typ "FILE"
   }
   &= help "Decode a Tree Calculus value into a string representation"
   &= explicit
@@ -71,9 +81,9 @@ main = do
           writeFile outputPath fRes
           putStrLn $ "Output to: " ++ outputPath
         Nothing -> putStr fRes
-    Decode { input = maybeInputPath } -> do
-      value <- case maybeInputPath of
-        Just inputPath -> readFile inputPath
+    Decode { file = maybeFilePath } -> do
+      value <- case maybeFilePath of
+        Just filePath -> readFile filePath
         Nothing -> getContents
       putStrLn $ decodeResult $ result $ evalTricu library $ parseTricu value