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{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
module TagUtils where
import qualified Data.Set as Set
import qualified Data.Text as T
import Data.Char
import Data.List.Split (wordsBy)
import Data.Monoid
import Data.Tree
import Notmuch.Message
import Notmuch.SearchResult
import TreeView
type Tag = T.Text
data TagOp = AddTag Tag | DelTag Tag
parseTags :: String -> [Tag]
parseTags =
mconcat . map (map T.pack . wordsBy isSpace . takeWhile (/='#')) . lines
diffTags :: [Tag] -> [Tag] -> [TagOp]
diffTags old new =
let oldTags = Set.fromList old
newTags = Set.fromList new
in (map DelTag $ Set.toList $ oldTags `Set.difference` newTags) ++
(map AddTag $ Set.toList $ newTags `Set.difference` oldTags)
patchRootLabelTags :: [TagOp] -> Tree TreeView -> Tree TreeView
patchRootLabelTags tagOps x =
x { rootLabel = patchTags tagOps $ rootLabel x }
patchTreeTags :: [TagOp] -> Tree TreeView -> Tree TreeView
patchTreeTags tagOps =
fmap (patchTags tagOps)
tagOpsToArgs :: [TagOp] -> [String]
tagOpsToArgs = map $ \case
AddTag t -> '+' : T.unpack t
DelTag t -> '-' : T.unpack t
patchTags :: [TagOp] -> TreeView -> TreeView
patchTags tagOps = \case
TVSearchResult sr ->
TVSearchResult sr { searchTags = foldr applyTagOp (searchTags sr) tagOps }
TVMessage m ->
TVMessage m { messageTags = foldr applyTagOp (messageTags m) tagOps }
x -> x -- nop
applyTagOp :: TagOp -> [Tag] -> [Tag]
applyTagOp = \case
AddTag t -> (t:)
DelTag t -> filter (/=t)
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