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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) <> #"-") | |
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25 | |
26 | (* Copyed from the portal, doesn't exactly go out this in the most | |
27 | direct way, or does it? *) | |
28 | ||
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29 | fun info name = |
30 | if not (validName name) then | |
31 | NONE | |
32 | else | |
33 | let | |
34 | val proc = Unix.execute ("/usr/bin/apt-cache", ["show", name]) | |
35 | val inf = Unix.textInstreamOf proc | |
36 | ||
37 | val _ = TextIO.inputLine inf (* in every let* lies an imperative program in disguise *) | |
38 | ||
39 | fun loop (section, descr) = | |
40 | case TextIO.inputLine inf of | |
41 | NONE => (section, descr) | |
42 | | SOME line => | |
43 | if size line >= 9 andalso String.substring (line, 0, 9) = "Section: " then | |
44 | loop (SOME (String.substring (line, 9, size line - 10)), descr) | |
45 | else if size line >= 13 andalso String.substring (line, 0, 13) = "Description: " then | |
46 | loop (section, SOME (String.substring (line, 13, size line - 14))) | |
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47 | else if size line >= 16 andalso String.substring (line, 0, 16) = "Description-en: " then |
48 | loop (section, SOME (String.substring (line, 16, size line - 17))) | |
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49 | else |
50 | loop (section, descr) | |
51 | in | |
52 | (case loop (NONE, NONE) of | |
53 | (SOME section, SOME descr) => SOME {section = section, description = descr} | |
54 | | _ => NONE) | |
55 | before ignore (Unix.reap proc) | |
56 | end | |
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57 | |
58 | fun installed name = | |
59 | validName name | |
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60 | andalso let |
61 | val proc = Unix.execute ("/usr/bin/apt-cache", ["policy", name]) | |
62 | val inf = Unix.textInstreamOf proc | |
63 | ||
64 | val _ = TextIO.inputLine inf | |
65 | in | |
66 | (case TextIO.inputLine inf of | |
67 | NONE => false | |
68 | | SOME line => | |
69 | case String.tokens Char.isSpace line of | |
70 | [_, "(none)"] => false | |
71 | | [_, _] => true | |
72 | | _ => false) | |
73 | before ignore (Unix.reap proc) | |
74 | end | |
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75 | |
76 | end |