1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
#pragma once
#include <cassert>
#include <functional>
#include <vector>
#include <unordered_map>
#include <getopt.h>
namespace dg {
using Handle = std::function<void()>;
class Options {
public:
Options();
void add(std::string const & name, int has_arg, int val, Handle handle);
void add(std::string const & name, int has_arg, int* flag, int val, Handle handle);
void process(int argc, char* argv[]);
private:
std::size_t num_flags;
std::vector<option> options;
std::unordered_map<int, Handle> handles;
};
Options::Options()
: num_flags{}
, options{}
, handles{} {
}
void Options::add(std::string const & name, int has_arg, int val, Handle handle) {
add(name, has_arg, nullptr, val, handle);
}
void Options::add(std::string const & name, int has_arg, int* flag, int val, Handle handle) {
options.emplace_back();
auto& option = options.back();
option.name = name.c_str();
option.has_arg = has_arg;
option.flag = flag;
option.val = val;
int index = val;
if (flag != nullptr) {
index = num_flags++;
}
handles[index] = handle;
}
void Options::process(int argc, char* argv[]) {
std::string shortopts;
for (auto const & option: options) {
if (option.flag != nullptr) {
continue;
}
shortopts += static_cast<char>(option.val);
switch (option.has_arg) {
case no_argument:
break;
case required_argument:
shortopts += ":";
break;
case optional_argument:
shortopts += "::";
break;
}
}
// add termination option
options.push_back({0, 0, 0, 0});
// handle arguments
while (true) {
int index{0};
int key = getopt_long(argc, argv, shortopts.c_str(), options.data(), &index);
if (key == -1) {
break;
} else if (key == 0) {
// call flag's handle
handles.at(index)();
} else {
// call option's handle
handles.at(key)();
}
}
// remove terminating option
options.pop_back();
assert(options.size() == handles.size());
}
}
|
