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118 lines
4.9 KiB
Haskell
118 lines
4.9 KiB
Haskell
-- | The all-important theming engine!
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--
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-- Cf
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-- https://hackage.haskell.org/package/vty/docs/Graphics-Vty-Attributes.html
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-- http://hackage.haskell.org/package/brick/docs/Brick-AttrMap.html
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-- http://hackage.haskell.org/package/brick-0.1/docs/Brick-Util.html
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-- http://hackage.haskell.org/package/brick-0.1/docs/Brick-Widgets-Core.html#g:5
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-- http://hackage.haskell.org/package/brick-0.1/docs/Brick-Widgets-Border.html
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{-# LANGUAGE CPP #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Hledger.UI.Theme (
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defaultTheme
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,getTheme
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,themes
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,themeNames
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)
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where
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import qualified Data.Map as M
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import Data.Maybe
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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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import Brick
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defaultTheme :: AttrMap
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defaultTheme = fromMaybe (snd $ head themesList) $ getTheme "white"
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-- the theme named here should exist;
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-- otherwise it will take the first one from the list,
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-- which must be non-empty.
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-- | Look up the named theme, if it exists.
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getTheme :: String -> Maybe AttrMap
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getTheme name = M.lookup name themes
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-- | A selection of named themes specifying terminal colours and styles.
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-- One of these is active at a time.
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--
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-- A hledger-ui theme is a vty/brick AttrMap. Each theme specifies a
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-- default style (Attr), plus extra styles which are applied when
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-- their (hierarchical) name matches the widget rendering context.
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-- "More specific styles, if present, are used and only fall back to
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-- more general ones when the more specific ones are absent, but also
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-- these styles get merged, so that if a more specific style only
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-- provides the foreground color, its more general parent style can
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-- set the background color, too."
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-- For example: rendering a widget named "b" inside a widget named "a",
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-- - if a style named "a" <> "b" exists, it will be used. Anything it
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-- does not specify will be taken from a style named "a" if that
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-- exists, otherwise from the default style.
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-- - otherwise if a style named "a" exists, it will be used, and
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-- anything it does not specify will be taken from the default style.
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-- - otherwise (you guessed it) the default style is used.
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--
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themes :: M.Map String AttrMap
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themes = M.fromList themesList
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themeNames :: [String]
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themeNames = map fst themesList
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(&) = withStyle
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active = fg brightWhite & bold
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selectbg = yellow
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select = black `on` selectbg
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themesList :: [(String, AttrMap)]
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themesList = [
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("default", attrMap (black `on` white) [
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("border" , white `on` black & dim)
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,("border" <> "bold" , currentAttr & bold)
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,("border" <> "depth" , active)
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,("border" <> "filename" , currentAttr)
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,("border" <> "key" , active)
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,("border" <> "minibuffer" , white `on` black & bold)
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,("border" <> "query" , active)
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,("border" <> "selected" , active)
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,("error" , fg red)
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,("help" , white `on` black & dim)
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,("help" <> "heading" , fg yellow)
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,("help" <> "key" , active)
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-- ,("list" , black `on` white)
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-- ,("list" <> "amount" , currentAttr)
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,("list" <> "amount" <> "decrease" , fg red)
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-- ,("list" <> "amount" <> "increase" , fg green)
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,("list" <> "amount" <> "decrease" <> "selected" , red `on` selectbg & bold)
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-- ,("list" <> "amount" <> "increase" <> "selected" , green `on` selectbg & bold)
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,("list" <> "balance" , currentAttr & bold)
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,("list" <> "balance" <> "negative" , fg red)
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,("list" <> "balance" <> "positive" , fg black)
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,("list" <> "balance" <> "negative" <> "selected" , red `on` selectbg & bold)
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,("list" <> "balance" <> "positive" <> "selected" , select & bold)
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,("list" <> "selected" , select)
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-- ,("list" <> "accounts" , white `on` brightGreen)
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-- ,("list" <> "selected" , black `on` brightYellow)
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])
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,("greenterm", attrMap (green `on` black) [
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("list" <> "selected" , black `on` green)
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])
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,("terminal", attrMap defAttr [
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("border" , white `on` black),
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("list" , defAttr),
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("list" <> "selected" , defAttr & reverseVideo)
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])
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]
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-- halfbrightattr = defAttr & dim
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-- reverseattr = defAttr & reverseVideo
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-- redattr = defAttr `withForeColor` red
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-- greenattr = defAttr `withForeColor` green
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-- reverseredattr = defAttr & reverseVideo `withForeColor` red
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-- reversegreenattr= defAttr & reverseVideo `withForeColor` green
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