% Copyright (C) 2007 Florian Weimer
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2, or (at your option)
% any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; see the file COPYING. If not, write to
% the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
% Boston, MA 02110-1301, USA.
\darcsCommand{show tags}
\begin{code}
module Darcs.Commands.ShowTags ( showTags ) where
import Darcs.Arguments ( DarcsFlag(..), workingRepoDir )
import Darcs.Commands ( DarcsCommand(..), nodefaults )
import Darcs.Hopefully ( info )
import Darcs.Repository ( amInRepository, readRepo, withRepository, ($-) )
import Darcs.Patch.Info ( piTag )
import Darcs.Patch.Set ( newset2RL )
import Darcs.Witnesses.Ordered ( mapRL )
import System.IO ( stderr, hPutStrLn )
showTagsDescription :: String
showTagsDescription = "Show all tags in the repository."
showTagsHelp :: String
showTagsHelp =
"The tags command writes a list of all tags in the repository to standard\n"++
"output.\n" ++
"\n" ++
"Tab characters (ASCII character 9) in tag names are changed to spaces\n" ++
"for better interoperability with shell tools. A warning is printed if\n" ++
"this happens."
showTags :: DarcsCommand
showTags = DarcsCommand {
commandName = "tags",
commandHelp = showTagsHelp,
commandDescription = showTagsDescription,
commandExtraArgs = 0,
commandExtraArgHelp = [],
commandCommand = tagsCmd,
commandPrereq = amInRepository,
commandGetArgPossibilities = return [],
commandArgdefaults = nodefaults,
commandAdvancedOptions = [],
commandBasicOptions = [workingRepoDir] }
tagsCmd :: [DarcsFlag] -> [String] -> IO ()
tagsCmd opts _ = withRepository opts $- \repository -> do
patches <- readRepo repository
sequence_ $ mapRL process $ newset2RL patches
where process hp =
case piTag $ info hp of
Just t -> do
t' <- normalize t t False
putStrLn t'
Nothing -> return ()
normalize :: String -> String -> Bool -> IO String
normalize _ [] _ = return []
normalize t (x : xs) flag =
if x == '\t' then do
if flag
then return ()
else hPutStrLn stderr
("warning: tag with TAB character: " ++ t)
rest <- (normalize t xs True)
return $ ' ' : rest
else do
rest <- (normalize t xs flag)
return $ x : rest
\end{code}