dvm.commands.Command source code

1 /**
2  * Copyright: Copyright (c) 2010-2011 Jacob Carlborg. All rights reserved.
3  * Authors: Jacob Carlborg
4  * Version: Initial created: Nov 8, 2010
5  * License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0)
6  */
7 module dvm.commands.Command;
8 
9 import dvm.dvm._;
10 import Path = dvm.io.Path;
11 
12 abstract class Command
13 {
14     string name;
15     string summary;
16 
17     protected Args args;
18     protected Options options;
19 
20     this () {}
21 
22     this (string name, string summary = "")
23     {
24         this.name = name;
25         this.summary = summary;
26         options = Options.instance;
27     }
28 
29     abstract void execute ();
30 
31     void invoke (string[] args ...)
32     {
33         this.args.args = args;
34         execute_;
35     }
36 
37     void invoke (Args args)
38     {
39         this.args = args;
40         execute_;
41     }
42 
43     private void execute_ ()
44     {
45         deleteTmpDirectory;
46         execute;
47     }
48 
49     private void deleteTmpDirectory ()
50     {
51         if (Path.exists(options.path.tmp))
52             Path.remove(options.path.tmp, true);
53     }
54 }
55 
56 private struct Args
57 {
58     string[] args;
59 
60     string opIndex (size_t index)
61     {
62         if (index > args.length - 1 && empty)
63             throw new MissingArgumentException("Missing argument(s)", __FILE__, __LINE__);
64 
65         return args[index];
66     }
67 
68     string first ()
69     {
70         return opIndex(0);
71     }
72 
73     string first (string arg)
74     {
75         if (empty)
76             args ~= arg;
77 
78         else
79             args[0] = arg;
80 
81         return arg;
82     }
83 
84     string last ()
85     {
86         return opIndex(args.length - 1);
87     }
88 
89     bool empty ()
90     {
91         return args.length == 0;
92     }
93 
94     bool any ()
95     {
96         return !empty;
97     }
98 }