(Rust) 命令树。

查看 rs文档。在 github 上查看进度并贡献。

cmdtree

创建一个命令和动作的树形数据结构，以添加直观和交互式的体验到应用程序中。cmdtree使用构建者模式使构建树更加便捷。

示例

extern crate cmdtree;
use cmdtree::*;

fn main() {
  let cmder = Builder::default_config("cmdtree-example")
    .begin_class("class1", "class1 help message") // a class
    .begin_class("inner-class1", "nested class!") // can nest a class
    .add_action("name", "print class name", |mut wtr, _args| {
      writeln!(wtr, "inner-class1",).unwrap()
    })
    .end_class()
    .end_class() // closes out the classes
    .begin_class("print", "pertains to printing stuff") // start another class sibling to `class1`
    .add_action("echo", "repeat stuff", |mut wtr, args| {
      writeln!(wtr, "{}", args.join(" ")).unwrap()
    })
    .add_action("countdown", "countdown from a number", |mut wtr, args| {
      if args.len() != 1 {
        println!("need one number",);
      } else {
        match str::parse::<u32>(args[0]) {
          Ok(n) => {
            for i in (0..=n).rev() {
              writeln!(wtr, "{}", i).unwrap();
            }
          }
          Err(_) => writeln!(wtr, "expecting a number!",).unwrap(),
        }
      }
    })
    .into_commander() // can short-circuit the closing out of classes
    .unwrap();

  cmder.run(); // run interactively
}

现在运行并在您的shell中

cmdtree-example=> help            <-- Will print help messages
help -- prints the help messages
cancel | c -- returns to the root class
exit -- sends the exit signal to end the interactive loop
Classes:
        class1 -- class1 help message
        print -- pertains to printing stuff
cmdtree-example=> print            <-- Can navigate the tree
cmdtree-example.print=> help
help -- prints the help messages
cancel | c -- returns to the root class
exit -- sends the exit signal to end the interactive loop
Actions:
        echo -- repeat stuff
        countdown -- countdown from a number
cmdtree-example.print=> echo hello, world!  <-- Call the actions
hello, world!
cmdtree-example.print=> countdown
need one number
cmdtree-example.print=> countdown 10
10
9
8
7
6
5
4
3
2
1
0
cmdtree-example.print=> exit      <-- exit the loop!