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feat: generate password with length and charset

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sup39 2024-01-25 15:47:49 +09:00
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/target

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[package]
name = "sup-randpass"
version = "0.1.0"
edition = "2021"
license = "MIT OR Apache-2.0"
authors = ["sup39 <dev@sup39.dev>"]
repository = "https://forgejo.sup39.dev/sup39/sup-randpass"
description = "A simple password generator by sup39"
[dependencies]
rand = "0.8.5"

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# sup-randpass
A simple password generator by sup39
## Usage
```sh
sup-randpass [LENGTH=36] [CHARSET...]
```
### Charset
* `-s`: space (`' '`)
* `-w`: alphanumeric (`'0'..='9'`, `'A'..='Z'`, `'a'..='z'`)
* `-d`: numerical digits (`'0'..='9'`)
* `-a`: alphabets (`'A'..='Z'`, `'a'..='z'`)
* `-u`: uppercase (`'A'..='Z'`)
* `-l`: lowercase (`'a'..='z'`)
* `--`: hyphen (`'-'`)
* o.w.: every characters in the argument string
If no charset is specified, all ASCII printable characters (`' '..='~'`) are used
### Examples
```sh
# generate password of length 36 containing ASCII printable characters
sup-randpass
# generate password of length 20 containing only alphanumeric characters
sup-randpass 20 -w
# generate password of length 32 containing alphanumeric characters or '+' '-' '%'
sup-randpass 20 -w +-%
```

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/// SPDX-FileCopyrightText: 2023-2024 sup39 <dev@sup39.dev>
/// SPDX-License-Identifier: MIT OR Apache-2.0
use rand::prelude::*;
const DEFAULT_LENGTH: usize = 36;
fn main() {
let mut args = std::env::args();
let _ = args.next(); // drop argv[0]
let length = args.next()
.map(|s| {
s.parse::<usize>()
.map_err(|_| format!("Length should be nonnegative, got {s}"))
.unwrap()
})
.unwrap_or(DEFAULT_LENGTH);
let mut charset = Vec::<char>::new();
args.for_each(|s| match s.as_str() {
"-s" => charset.push(' '),
"-w" => {
charset.extend('0'..='9');
charset.extend('A'..='Z');
charset.extend('a'..='z');
},
"-d" => charset.extend('0'..='9'),
"-a" => {
charset.extend('A'..='Z');
charset.extend('a'..='z');
},
"-u" => charset.extend('A'..='Z'),
"-l" => charset.extend('a'..='z'),
"--" => charset.push('-'),
s => charset.extend(s.chars()),
});
if charset.len() == 0 {
charset = (' '..='~').collect();
}
let mut rng = rand::thread_rng();
let result: String = (0..length)
.map(|_| charset.choose(&mut rng).unwrap())
.collect();
print!("{}", result);
}