4 Copyright 2013 Louis-Guillaume Gagnon <louis.guillaume.gagnon@gmail.com>
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 import Data
.Char (isDigit)
26 import Tools
.Constants
27 import Tools
.Operation
(isHelp
)
29 modify
:: [String] -> IO ()
30 modify
[] = error errTooFew
31 modify
(f
:[]) = if isHelp f
then putStrLn usageModify
else error errTooFew
32 modify
(id:fs
) = if or (map (not . isDigit) id)
33 then error $ "modify: invalid id: " ++ id
37 errTooFew
= "modify: too few arguments ('" ++ progName
++ " modify help' for help)"
40 usageModify
= "usage: " ++ progName
++ " modify <id> <filters>\n\
44 \ -a +<author-add> <author-remove>\n\
45 \ -k +<keyword-add> <keyword-remove>\n\
49 \ -p <new page-from> <new page-to>\n\