| 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 |
| 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 |
| 43 | |
| 44 | end |