Allow to tune the brief description renderer

Author: smelc

src/Options/Applicative.hs

@@ -202,6 +202,7 @@ module Options.Applicative (
   helpLongEquals,
   helpShowGlobals,
   helpIndent,
+  briefHangPoint,
   defaultPrefs,
 
   -- * Completions

src/Options/Applicative/Builder.hs

@@ -90,6 +90,7 @@ module Options.Applicative.Builder (
   helpLongEquals,
   helpShowGlobals,
   helpIndent,
+  briefHangPoint,
   prefs,
   defaultPrefs,
 
@@ -582,6 +583,9 @@ helpShowGlobals = PrefsMod $ \p -> p { prefHelpShowGlobal = True }
 helpIndent :: Int -> PrefsMod
 helpIndent w = PrefsMod $ \p -> p { prefTabulateFill = w }
 
+-- | Set the width at which to hang the brief help text.
+briefHangPoint :: Int -> PrefsMod
+briefHangPoint php = PrefsMod $ \p -> p { prefBriefHangPoint = php }
 
 
 -- | Create a `ParserPrefs` given a modifier
@@ -597,7 +601,8 @@ prefs m = applyPrefsMod m base
       , prefColumns = 80
       , prefHelpLongEquals = False
       , prefHelpShowGlobal = False
-      , prefTabulateFill = 24 }
+      , prefTabulateFill = 24
+      , prefBriefHangPoint = 35 }
 
 -- Convenience shortcuts
 

src/Options/Applicative/Help/Core.hs

@@ -414,7 +414,7 @@ parserUsage pprefs p progn =
     hsep
       [ pretty "Usage:",
         pretty progn,
-        hangAtIfOver 9 35 (extractChunk (briefDesc pprefs p))
+        hangAtIfOver 9 (prefBriefHangPoint pprefs) (extractChunk (briefDesc pprefs p))
       ]
 
 -- | Peek at the structure of the rendered tree within.

src/Options/Applicative/Types.hs

@@ -127,7 +127,8 @@ data ParserPrefs = ParserPrefs
   , prefHelpShowGlobal :: Bool    -- ^ when displaying subparsers' usage help,
                                   -- show parent options under a "global options"
                                   -- section (default: False)
-  , prefTabulateFill ::Int       -- ^ Indentation width for tables
+  , prefTabulateFill ::Int        -- ^ Indentation width for tables
+  , prefBriefHangPoint :: Int     -- ^ Width at which to hang the brief description
   } deriving (Eq, Show)
 
 data OptName = OptShort !Char