2 * Copyright (C) 2013 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
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.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 type filename = string
23 type hashes = string array
24 type cache = (string * hashes) list
26 let (//) = Filename.concat
31 try Some (Sys.getenv "HOME" // ".similarity-cache.v" ^ version)
32 with Not_found -> None
34 let read_cache_file () : cache =
39 let chan = open_in cache_file in
40 let v = input_value chan in
46 let write_cache_file (cache : cache) =
50 let tmp_name = cache_file ^ ".tmp" in
51 let chan = open_out tmp_name in
52 output_value chan cache;
54 rename tmp_name cache_file
56 let get_hash cache filename =
57 try Some (List.assoc filename cache) with Not_found -> None
59 let update_hash cache filename hashes =
60 let cache = List.remove_assoc filename cache in
61 (filename, hashes) :: cache