sily.getopt source code

1 module sily.getopt;
2 
3 import std.getopt: Option;
4 import std.algorithm: max;
5 import std.stdio: writefln;
6 
7 /** 
8  * Prints passed **Option**s and text in aligned manner on stdout, i.e:
9  * ```
10  * A simple cli tool
11  * 
12  * Usage: 
13  *   scli [options] [script] \
14  *   scli run [script]
15  * 
16  * Options: 
17  *   -h, --help   This help information. \
18  *   -c, --check  Check syntax without running. \
19  *   --quiet      Run silently (no output). 
20  * Commands:
21  *   run          Runs script. \
22  *   compile      Compiles script.
23  * ```
24  * Params:
25  *   text = Text to be printed at the beginning of the help output
26  *   usage = Usage string
27  *   com = Commands
28  *   opt = The **Option** extracted from the **getopt** parameter
29  */
30 void printGetopt(string text, string usage, Commands[] com, Option[] opt) {
31     size_t maxLen = 0;
32 
33     foreach (it; opt) {
34         int sep = it.optShort == "" ? 0 : 2;
35         maxLen = max(maxLen, it.optShort.length + it.optLong.length + sep);
36     }
37 
38     foreach (it; com) {
39         maxLen = max(maxLen, it.name.length);
40     }
41     
42     if (text != "") {
43         writefln(text);
44     }
45     
46     if (usage != "") {
47         if (text != "") writefln("");
48         writefln("Usage:");
49         writefln("  " ~ usage);
50     }
51 
52     if (com.length != 0) {
53         if (text != "" || usage != "") writefln("");
54         writefln("Options:");
55     }
56 
57     foreach (it; opt) {
58         // writefln("%*s %*s%s%s", 
59         // shortLen, it.optShort,
60         //     longLen, it.optLong,
61         //     it.required ? " Required: " : " ", it.help);
62         string opts = it.optShort ~ (it.optShort == "" ? "" : ", ") ~ it.optLong;
63         writefln("  %-*s  %s", maxLen, opts, it.help);
64     }
65 
66     if (com.length != 0) {
67         if (text != "" || usage != "" || com.length != 0) writefln("");
68         writefln("Commands:");
69     }
70 
71     foreach (it; com) { 
72         writefln("  %-*s  %s", maxLen, it.name, it.help);
73     }
74 }
75 
76 struct Commands {
77     string name;
78     string help;
79 }