| 1 | (* HCoop Domtool (http://hcoop.sourceforge.net/) |
| 2 | * Copyright (c) 2006, 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 | (* Code for receiving and executing configuration files *) |
| 20 | |
| 21 | structure Slave :> SLAVE = struct |
| 22 | |
| 23 | datatype file_action = |
| 24 | Add |
| 25 | | Delete |
| 26 | | Modify |
| 27 | |
| 28 | type file_status = {action : file_action, |
| 29 | domain : string, |
| 30 | file : string} |
| 31 | |
| 32 | val fileHandler = ref (fn _ : file_status => ()) |
| 33 | val preHandler = ref (fn () => ()) |
| 34 | val postHandler = ref (fn () => ()) |
| 35 | |
| 36 | fun registerFileHandler handler = |
| 37 | let |
| 38 | val old = !fileHandler |
| 39 | in |
| 40 | fileHandler := (fn x => (handler x; old x)) |
| 41 | end |
| 42 | |
| 43 | fun registerPreHandler handler = |
| 44 | let |
| 45 | val old = !preHandler |
| 46 | in |
| 47 | preHandler := (fn () => (handler (); old ())) |
| 48 | end |
| 49 | |
| 50 | fun registerPostHandler handler = |
| 51 | let |
| 52 | val old = !postHandler |
| 53 | in |
| 54 | postHandler := (fn () => (handler (); old ())) |
| 55 | end |
| 56 | |
| 57 | fun handleChanges fs = (!preHandler (); |
| 58 | app (!fileHandler) fs; |
| 59 | !postHandler ()) |
| 60 | |
| 61 | end |