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bd89f787d2
This change splits up Monoid instances into Monoid and Semigroup. It also conditionally imports Data.Monoid on GHCs prior to 8.4.
80 lines
2.5 KiB
Haskell
80 lines
2.5 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE CPP #-}
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module Main where
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#if !(MIN_VERSION_base(4,11,0))
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import Data.Monoid
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#endif
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import Graphics.Vty
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( Attr, white, blue, cyan, green, red, yellow
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, black, withURL
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)
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import Brick.Main
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import Brick.Types
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( Widget
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)
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import Brick.Widgets.Core
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( (<=>)
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, withAttr
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, vBox
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, str
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, hyperlink
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, modifyDefAttr
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)
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import Brick.Util (on, fg)
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import Brick.AttrMap (attrMap, AttrMap)
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ui :: Widget n
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ui =
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vBox [ str "This text uses the global default attribute."
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, withAttr "foundFull" $
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str "Specifying an attribute name means we look it up in the attribute tree."
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, (withAttr "foundFgOnly" $
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str ("When we find a value, we merge it with its parent in the attribute")
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<=> str "name tree all the way to the root (the global default).")
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, withAttr "missing" $
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str "A missing attribute name just resumes the search at its parent."
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, withAttr ("general" <> "specific") $
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str "In this way we build complete attribute values by using an inheritance scheme."
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, withAttr "foundFull" $
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str "You can override everything ..."
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, withAttr "foundFgOnly" $
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str "... or only what you want to change and inherit the rest."
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, str "Attribute names are assembled with the Monoid append operation to indicate"
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, str "hierarchy levels, e.g. \"window\" <> \"title\"."
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, str " "
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, withAttr "linked" $
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str "This text is hyperlinked in terminals that support hyperlinking."
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, str " "
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, hyperlink "http://www.google.com/" $
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str "This text is also hyperlinked in terminals that support hyperlinking."
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, str " "
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, modifyDefAttr (`withURL` "http://www.google.com/") $
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str "This text is hyperlinked by modifying the default attribute."
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]
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globalDefault :: Attr
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globalDefault = white `on` blue
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theMap :: AttrMap
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theMap = attrMap globalDefault
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[ ("foundFull", white `on` green)
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, ("foundFgOnly", fg red)
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, ("general", yellow `on` black)
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, ("general" <> "specific", fg cyan)
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, ("linked", fg yellow `withURL` "http://www.google.com/")
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]
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app :: App () e ()
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app =
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App { appDraw = const [ui]
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, appHandleEvent = resizeOrQuit
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, appStartEvent = return
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, appAttrMap = const theMap
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, appChooseCursor = neverShowCursor
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}
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main :: IO ()
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main = defaultMain app ()
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