我遇到了与 Is there any straightforward way for Clap to display help when no command is provided? 相同的问题,但该问题中提出的解决方案对我来说还不够好。
.setting(AppSettings::ArgRequiredElseHelp)
如果没有提供参数则停止程序,即使没有提供参数我也需要程序继续执行。我需要额外显示的帮助。
最佳答案
你可以写之前的字符串。
use clap::{App, SubCommand};
use std::str;
fn main() {
let mut app = App::new("myapp")
.version("0.0.1")
.about("My first CLI APP")
.subcommand(SubCommand::with_name("ls").about("List anything"));
let mut help = Vec::new();
app.write_long_help(&mut help).unwrap();
let _ = app.get_matches();
println!("{}", str::from_utf8(&help).unwrap());
}
或者您可以使用 get_matches_safe
use clap::{App, AppSettings, ErrorKind, SubCommand};
fn main() {
let app = App::new("myapp")
.setting(AppSettings::ArgRequiredElseHelp)
.version("0.0.1")
.about("My first CLI APP")
.subcommand(SubCommand::with_name("ls").about("List anything"));
let matches = app.get_matches_safe();
match matches {
Err(e) => {
if e.kind == ErrorKind::MissingArgumentOrSubcommand {
println!("{}", e.message)
}
}
_ => (),
}
}
关于rust - 调用 Clap 的 get_matches 后如何显示帮助?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54837057/