-- Copyright (c) 2010, Diego Souza
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
--   * Redistributions of source code must retain the above copyright notice,
--     this list of conditions and the following disclaimer.
--   * Redistributions in binary form must reproduce the above copyright notice,
--     this list of conditions and the following disclaimer in the documentation
--     and/or other materials provided with the distribution.
--   * Neither the name of the <ORGANIZATION> nor the names of its contributors
--     may be used to endorse or promote products derived from this software
--     without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-- OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

module Yql.UI.CLI.Commands.ManLf
       ( manlf
       ) where

import qualified Yql.Core.LocalFunction as F
import qualified Data.Map as M
import Data.List (sort)
import Yql.UI.CLI.Command

-- | Invokes the man of a given local function
manlf :: F.Database -> Command String
manlf db = Command (doc, const exe)
  where doc link = unlines [ "Prints the help message of the given local function. Without arguments prints all available functions."
                           , "Examples:"
                           , "    :"++ link ++" .request"
                           , "    :"++ link ++" .tables"
                           ]
        exe args = if (null args)
                   then return list
                   else return $ concatMap manpage args
          where list = let links = M.keys db
                       in unlines (map ('.':) (sort links))

                manpage link = case (M.lookup (drop 1 link) db)
                               of Nothing -> "man: no manual entry for "++ link
                                  Just f  -> link ++": "++ F.man f link