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|
use std::collections::HashMap;
use std::process;
use std::io::{self, Write};
struct Employees {
departments: HashMap<String, Vec<String>>,
}
impl Employees {
fn add_employee(&self, name: &Option<&String>, department: &Option<&String>) -> Result<(), &'static str> {
// parse name
let name = match name {
Some(s) => s,
None => {
return Err("Invalid or empty name.");
},
};
// parse department
let dept = match department {
Some(s) => s,
None => {
return Err("Invalid or empty department.");
},
};
// add name to department in departments
// and create department if it doesn't exist
employees.entry(dept.to_string())
.or_insert(Vec::new())
.push(name.to_string());
Ok(())
}
}
//fn list_employees() {
// let dept = match actions.get(1) {
// Some(s) => s,
// None => {
// ""
// }
// };
//
// if dept == "" {
// // print employees in all depts
// for each in employees.keys() {
// println!("{}", each);
// match employees.get(&each.to_string()) {
// Some(v) => {
// for every in v {
// println!(" {}", every);
// }
// },
// None => continue,
// };
// }
// }
// else {
// // print employees in single dept
// match employees.get(&dept.to_string()) {
// Some(v) => {
// for every in v {
// println!("{}", every);
// };
// },
// None => {
// eprintln!("List: Invalid department.");
// continue;
// }
// };
// }
//}
//
//fn list_employee(name) {
//}
//fn remove_employee(name) {
// let name = match actions.get(1) {
// Some(s) => s,
// None => {
// eprintln!("Remove: Invalid or empty name.");
// continue;
// },
// };
//
// let dept = match actions.get(2) {
// Some(s) => s,
// None => {
// eprintln!("Remove: Empty department.");
// continue;
// },
// };
//
// match employees.get_mut(&dept.to_string()) {
// Some(v) => {
// v.retain(|employee| employee != name);
// },
// None => {
// eprintln!("Remove: Invalid department.");
// continue;
// }
// };
//}
fn get_actions() -> Vec<String> {
print!("> ");
io::stdout().flush().unwrap();
// grab input
let mut input = String::new();
io::stdin().read_line(&mut input)
.expect("Failed to read input.");
// finish on eof
if input == "" {
println!("Bye.");
process::exit(0);
}
// collect all CLI arguments into vector of trimmed Strings
input.trim()
.split_whitespace()
.map(|action| action.to_string())
.collect()
}
fn main() {
println!("Welcome to employee manager.");
println!("Enter 'help' for help or Ctrl+D to exit.");
let mut departments: HashMap<String, Vec<String>> = HashMap::new();
// operating loop
loop {
let actions = get_actions();
// act on actions
let command = match actions.get(0) {
Some(c) => c,
None => {
eprintln!("Empty command. Enter Ctrl+D to exit.");
continue;
}
};
match command.as_str() {
// add employee to department
"add" => {
match add_employee(&actions.get(1), &actions.get(2), &mut departments) {
Ok(()) => {dbg!(&departments);},
Err(e) => eprintln!("{}", e),
};
},
// list employees from one or all departments
"list" => {
},
// remove employee from department
"remove" => {
},
// print help
"help" => {
println!("Valid commands include:");
println!("\tlist [department]");
println!("\tadd <name> <department>");
println!("\tremove <name> <department>");
println!("Enter 'help' for help or Ctrl+D to exit.");
},
// all else fails
_ => eprintln!("Invalid command."),
}
}
}
|
