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121 lines
5.0 KiB
Haskell
121 lines
5.0 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 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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) where
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import qualified Data.Map as M
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import Data.Maybe
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import Data.Monoid
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import Graphics.Vty
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import Brick
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import Brick.Widgets.Border
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import Brick.Widgets.List
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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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themesList :: [(String, AttrMap)]
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themesList = [
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("default", attrMap
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(black `on` white & bold) [ -- default style for this theme
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("error", currentAttr `withForeColor` red),
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(borderAttr , white `on` black & dim),
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(borderAttr <> "bold", white `on` black & bold),
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(borderAttr <> "query", cyan `on` black & bold),
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(borderAttr <> "depth", yellow `on` black & bold),
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(borderAttr <> "keys", white `on` black & bold),
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(borderAttr <> "minibuffer", white `on` black & bold),
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-- ("normal" , black `on` white),
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("list" , black `on` white), -- regular list items
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("list" <> "selected" , white `on` blue & bold), -- selected list items
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-- ("list" <> "selected" , black `on` brightYellow),
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-- ("list" <> "accounts" , white `on` brightGreen),
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("list" <> "amount" <> "increase", currentAttr `withForeColor` green),
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("list" <> "amount" <> "decrease", currentAttr `withForeColor` red),
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("list" <> "balance" <> "positive", currentAttr `withForeColor` black),
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("list" <> "balance" <> "negative", currentAttr `withForeColor` red),
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("list" <> "amount" <> "increase" <> "selected", brightGreen `on` blue & bold),
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("list" <> "amount" <> "decrease" <> "selected", brightRed `on` blue & bold),
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("list" <> "balance" <> "positive" <> "selected", white `on` blue & bold),
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("list" <> "balance" <> "negative" <> "selected", brightRed `on` blue & bold)
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]),
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("terminal", attrMap
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defAttr [ -- use the current terminal's default style
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(borderAttr , white `on` black),
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-- ("normal" , defAttr),
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(listAttr , defAttr),
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(listSelectedAttr , defAttr & reverseVideo & bold)
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-- ("status" , defAttr & reverseVideo)
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]),
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("greenterm", attrMap
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(green `on` black) [
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-- (listAttr , green `on` black),
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(listSelectedAttr , black `on` green & bold)
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])
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-- ("colorful", attrMap
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-- defAttr [
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-- (listAttr , defAttr & reverseVideo),
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-- (listSelectedAttr , defAttr `withForeColor` white `withBackColor` red)
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-- -- ("status" , defAttr `withForeColor` black `withBackColor` green)
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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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