[英]How to use an enum that represents subcommands with StructOpt?
参考StructOpt的“Git”示例,我不明白我应该如何使用参数中的数据。
我对 Rust 相当陌生,所以我猜这很明显。 不幸的是,我可以用枚举找到的所有示例都只执行println!
在对象上,所以我被卡住了。 我以为我会做一场match
但它不起作用。
那么您将如何找到用户传递了哪些命令来运行您的程序?
#[macro_use]
extern crate structopt;
use std::path::PathBuf;
use structopt::StructOpt;
#[derive(StructOpt, Debug)]
#[structopt(name = "git", about = "the stupid content tracker")]
enum Git {
#[structopt(name = "add")]
Add {
#[structopt(short = "i")]
interactive: bool,
#[structopt(short = "p")]
patch: bool,
#[structopt(parse(from_os_str))]
files: Vec<PathBuf>
},
#[structopt(name = "fetch")]
Fetch {
#[structopt(long = "dry-run")]
dry_run: bool,
#[structopt(long = "all")]
all: bool,
repository: Option<String>
},
#[structopt(name = "commit")]
Commit {
#[structopt(short = "m")]
message: Option<String>,
#[structopt(short = "a")]
all: bool
}
}
fn main() {
let opt = Git::from_args();
println!("{:?}", opt);
match opt() {
Git::Add(cmd) => println!("{:?}", cmd.interactive),
_ => (),
}
}
汇编:
05:42 $ cargo run -- add -i
Compiling example v0.1.0 (file:///Users/froyer/src/example)
error[E0532]: expected tuple struct/variant, found struct variant `Git::Add`
--> src/main.rs:41:9
|
41 | Git::Add(cmd) => println!("{:?}", cmd.interactive),
| ^^^^^^^^ did you mean `Git::Add { /* fields */ }`?
error[E0618]: expected function, found enum variant `opt`
--> src/main.rs:40:11
|
37 | let opt = Git::from_args();
| --- `opt` defined here
...
40 | match opt() {
| ^^^^^ not a function
help: `opt` is a unit variant, you need to write it without the parenthesis
|
40 | match opt {
| ^^^
感谢structopt 存储库中的问题 #1 ,我终于明白它应该如何工作了:)
fn main () {
match Git::from_args() {
Git::Add { interactive, patch, files } => {
println!("{:?}", interactive)
},
Git::Commit { message, all } => {
//...
}
_ => (),
}
}
我遇到了同样的问题,并认为我会进一步清除 @kellpossible 的例子:
#[macro_use]
extern crate structopt;
pub use structopt::StructOpt;
use std::path::PathBuf;
#[derive(Debug, StructOpt)]
#[structopt(name = "example", about="how to use struct-opt crate")]
pub struct Opts{
#[structopt(short = "v", parse(from_occurrences))]
verbosity: u8,
// SUBCOMMANDS
#[structopt(subcommand)]
commands: Option<Git>
}
#[derive(StructOpt, Debug)]
#[structopt(name = "git", about = "the stupid content tracker")]
enum Git {
#[structopt(name = "add")]
Add (AddOpts),
#[structopt(name = "fetch")]
Fetch(FetchOpts),
#[structopt(name = "commit")]
Commit(CommitOpts)
}
#[derive(StructOpt, Debug)]
struct AddOpts {
#[structopt(short = "i")]
interactive: bool,
#[structopt(short = "p")]
patch: bool,
#[structopt(parse(from_os_str))]
files: Vec<PathBuf>
}
#[derive(Debug, StructOpt)]
pub struct FetchOpts {
#[structopt(long = "dry-run")]
dry_run: bool,
#[structopt(long = "all")]
all: bool,
repository: Option<String>
}
#[derive(Debug, StructOpt)]
pub struct CommitOpts {
#[structopt(short = "m")]
message: Option<String>,
#[structopt(short = "a")]
all: bool
}
fn main() {
println!("Hello subcommands!");
let opt = Opts::from_args();
handle_subcommand(opt);
}
fn handle_subcommand(opt: Opts){
// handle subcommands
if let Some(subcommand) = opt.commands{
match subcommand {
Git::Add(cfg) => {
println!("handle Add: {:?}", cfg);
},
Git::Commit(cfg) => {
println!("handle Commit: {:?}", cfg);
},
Git::Fetch(cfg) => {
println!("handle Fetch: {:?}", cfg);
},
}
}
}
希望这会有所帮助,但如果有人知道更好的方法会感兴趣。
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