src/domain.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 (* Domain-related primitive actions *)
  20
  21 structure Domain :> DOMAIN = struct
  22
  23 open Ast
  24
  25 val befores = ref (fn (_ : string) => ())
  26 val afters = ref (fn (_ : string) => ())
  27
  28 fun registerBefore f =
  29     let
  30         val old = !befores
  31     in
  32         befores := (fn x => (old x; f x))
  33     end
  34
  35 fun registerAfter f =
  36     let
  37         val old = !afters
  38     in
  39         afters := (fn x => (old x; f x))
  40     end
  41
  42 val current = ref ""
  43 val currentPath = ref ""
  44
  45 fun currentDomain () = !current
  46
  47 fun domainFile name = TextIO.openOut (!currentPath ^ name)
  48
  49 fun getPath domain =
  50     let
  51         val toks = String.fields (fn ch => ch = #".") domain
  52
  53         val elems = foldr (fn (piece, elems) =>
  54                               let
  55                                   val elems = piece :: elems
  56                                   val path = String.concatWith "/" (Config.configRoot :: rev elems)
  57                               in
  58                                   (if Posix.FileSys.ST.isDir
  59                                           (Posix.FileSys.stat path) then
  60                                        ()
  61                                    else
  62                                        (OS.FileSys.remove path;
  63                                         OS.FileSys.mkDir path))
  64                                   handle OS.SysErr _ => OS.FileSys.mkDir path;
  65                                   elems
  66                               end) [] toks
  67     in
  68         String.concatWith "/" (Config.configRoot :: rev elems)
  69     end
  70
  71 val _ = Env.registerContainer ("domain",
  72                             fn (_, [(EString dom, _)]) => (current := dom;
  73                                                            currentPath := getPath dom;
  74                                                            !befores dom;
  75                                                            StringMap.empty)
  76                              | _ => Env.badArgs "domain",
  77                             fn () => !afters (!current))
  78
  79 end