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1 | (* HCoop Domtool (http://hcoop.sourceforge.net/) |
2 | * Copyright (c) 2006-2007, Adam Chlipala |
3 | * |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU General Public License |
6 | * as published by the Free Software Foundation; either version 2 |
7 | * of the License, or (at your option) any later version. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
17 | *) |
18 | |
19 | (* APT package database querying *) |
20 | |
21 | structure Apt :> APT = struct |
22 | |
23 | fun validName s = CharVector.all (fn ch => Char.isAlphaNum ch orelse ch = #"_" orelse ch = #"-" orelse ch = #".") s |
24 | andalso (size s > 0 andalso String.sub (s, 0) <> #"-") |
25 | |
26 | fun installed name = |
27 | validName name |
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28 | andalso let |
29 | val proc = Unix.execute ("/usr/bin/apt-cache", ["policy", name]) |
30 | val inf = Unix.textInstreamOf proc |
31 | |
32 | val _ = TextIO.inputLine inf |
33 | in |
34 | (case TextIO.inputLine inf of |
35 | NONE => false |
36 | | SOME line => |
37 | case String.tokens Char.isSpace line of |
38 | [_, "(none)"] => false |
39 | | [_, _] => true |
40 | | _ => false) |
41 | before ignore (Unix.reap proc) |
42 | end |
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43 | |
44 | end |