src/slave.sml

   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 fun shell ss = OS.Process.isSuccess (OS.Process.system (String.concat ss))
  62
  63 fun shellF (ss, msg) =
  64     let
  65         val s = String.concat ss
  66     in
  67         if OS.Process.isSuccess (OS.Process.system s) then
  68             ()
  69         else
  70             ErrorMsg.error NONE (msg s)
  71     end
  72
  73 fun concatTo p fname =
  74     let
  75         fun visitDir dname =
  76             let
  77                 val dir = Posix.FileSys.opendir dname
  78
  79                 fun loop () =
  80                     case Posix.FileSys.readdir dir of
  81                         NONE => Posix.FileSys.closedir dir
  82                       | SOME fname' =>
  83                         let
  84                             val path = OS.Path.joinDirFile {dir = dname, file = fname'}
  85                         in
  86                             if Posix.FileSys.ST.isDir (Posix.FileSys.stat path) then
  87                                 visitDir path
  88                             else if p fname' then
  89                                 shellF ([Config.cat, " ", path, " >>", fname],
  90                                                fn cl => "Error concatenating: " ^ cl)
  91                             else
  92                                 ();
  93                             loop ()
  94                         end
  95             in
  96                 TextIO.closeOut (TextIO.openOut fname);
  97                 loop ()
  98             end
  99     in
 100         visitDir Config.resultRoot
 101     end
 102
 103 end