app/Issue/Meta.hs


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module Issue.Meta
  ( Meta (..),
    getMeta,
  )
where

import Issue (Issue (..))
import Issue.Tag (Tag, tagValue)

data Meta = Meta
  { referencedBy :: [(Issue, Tag)]
  }
  deriving (Show)

getMeta :: [Issue] -> Issue -> Meta
getMeta issues issue =
  Meta
    { referencedBy =
        concatMap
          ( \issueOther ->
              let tagsRelevant =
                    filter (\tag -> tagValue tag == Just issue.id) issueOther.tags
               in map (\tag -> (issueOther, tag)) tagsRelevant
          )
          issues
    }