%  Copyright (C) 2008 Eric Kow
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\subsubsection{darcs show authors}
\begin{code}
module Darcs.Commands.ShowAuthors ( show_authors ) where

import Data.List ( sort, group )

import Darcs.Arguments ( DarcsFlag(..), working_repo_dir )
import Darcs.Commands ( DarcsCommand(..), nodefaults )
import Darcs.External ( viewDoc )
import Darcs.Hopefully ( info )
import Darcs.Repository ( amInRepository, read_repo, withRepository, ($-) )
import Darcs.Patch.Info ( pi_author )
import Darcs.Ordered ( mapRL, concatRL )
import Printer ( text )
\end{code}

\options{show authors}

\haskell{show_authors_help}

\begin{code}
show_authors_description :: String
show_authors_description = "Show all authors in the repository."
\end{code}

\begin{code}
show_authors_help :: String
show_authors_help =
 "The authors command writes a list of all patch authors in the repository to\n" ++
 "standard output."
\end{code}

\begin{code}
show_authors :: DarcsCommand
show_authors = DarcsCommand {
  command_name = "authors",
  command_help = show_authors_help,
  command_description = show_authors_description,
  command_extra_args = 0,
  command_extra_arg_help = [],
  command_command = authors_cmd,
  command_prereq = amInRepository,
  command_get_arg_possibilities = return [],
  command_argdefaults = nodefaults,
  command_advanced_options = [],
  command_basic_options = [working_repo_dir] }

authors_cmd :: [DarcsFlag] -> [String] -> IO ()
authors_cmd opts _ = withRepository opts $- \repository -> do
  patches <- read_repo repository
  let authors = mapRL process $ concatRL patches
  viewDoc $ text $ unlines $
   if Verbose `elem` opts
      then authors
      else reverse $ map shownames $ sort $
           map (\s -> (length s,head s)) $ group $ sort authors
  where
    process =  pi_author . info
    shownames (n, a) = show n ++ "\t" ++ a
\end{code}