first

.gitignore

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+/target
+.*~
+*~
+Session.vim

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ds"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "ds"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

README.md

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+*New git.org.ru repo tutorial*  
+*Rust programming language*

src/main.rs

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+mod os;
+use os::args as ar;
+
+fn main() {
+    ar::run();
+}

src/os/args.rs

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+use std::{env, process};
+
+//#[derive(Debug)]
+struct Args {
+    flags: Vec<char>,
+    script: String,
+    files: Vec<String>,
+}
+
+pub fn run() {
+    let ret = get_args();
+    println!("{:?} {:?} {:?}", ret.flags, ret.script, ret.files);
+}
+
+fn get_args() -> Args {
+    let args: Vec<String> = env::args().skip(1).collect();
+    let mut flags = Vec::new();
+    let usage: &str = "Usage: ds -[vn](e|f) script files...";
+    for (ind, item) in args.iter().enumerate() {
+        if item.starts_with('-') {
+            for (i, sw) in item.chars().skip(1).enumerate() {
+                match sw {
+                    'h' => {
+                        println!("{}", usage);
+                        process::exit(0);
+                    }
+                    'f' | 'e' => {
+                        if i + 2 != item.len() {
+                            eprintln!("-{} it is not last flag", sw);
+                            process::exit(1);
+                        }
+                        let script = match args.get(ind + 1) {
+                            None => {
+                                eprintln!("not argument script");
+                                process::exit(1);
+                            }
+                            Some(x) => x.to_owned(),
+                        };
+                        let files = match args.get(ind + 2..) {
+                            //.unwrap_or(&[]).to_vec();
+                            None | Some([]) => {
+                                eprintln!("not argument files");
+                                process::exit(1);
+                            }
+                            Some(x) => x.to_vec(),
+                        };
+                        flags.push(sw);
+                        return Args {
+                            flags,
+                            script,
+                            files,
+                        };
+                    }
+                    x => flags.push(x),
+                }
+            }
+        }
+    }
+    eprintln!("{}", usage);
+    process::exit(1);
+}

src/os/mod.rs

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+pub mod args;