getid 0.4.1

A tool to generate a random { cuid, nanoid, uuidv4 }.
Documentation 
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mod hostname;

pub mod args {
    pub enum AppArgs {
        Cuid {
            show_help: bool,
            slug: bool,
        },
        Hostname {
            show_help: bool,
            token_length: Option<usize>,
        },
        Nanoid {
            show_help: bool,
            length: Option<usize>,
        },
        Uuidv4 {
            show_help: bool,
            urn: bool,
            simple: bool,
        },
        #[allow(dead_code)]
        Global {
            show_help: bool,
            version: bool,
        },
    }

    pub fn parse_args() -> Result<AppArgs, Box<dyn std::error::Error>> {
        let mut args = pico_args::Arguments::from_env();

        let app_args = match args.subcommand()?.as_deref() {
            Some("cuid") => Ok(AppArgs::Cuid {
                show_help: args.contains(["-h", "--help"]),
                slug: args.contains("--slug"),
            }),
            Some("nanoid") | Some("nano") => Ok(AppArgs::Nanoid {
                show_help: args.contains(["-h", "--help"]),
                length: args.opt_value_from_str("--length")?,
            }),
            Some("uuidv4") | Some("uuid") => Ok(AppArgs::Uuidv4 {
                show_help: args.contains(["-h", "--help"]),
                simple: args.contains("--simple"),
                urn: args.contains("--urn"),
            }),
            Some("hostname") | Some("heroku") => Ok(AppArgs::Hostname {
                show_help: args.contains(["-h", "--help"]),
                token_length: args.opt_value_from_str("--token_length")?,
            }),
            Some(s) => Err(format!(
                "unknown subcommand: {}. Type `getid --help` to see available commands.",
                s
            )
            .into()),
            None => Ok(AppArgs::Global {
                show_help: args.contains(["-h", "--help"]),
                version: args.contains(["-v", "--version"]),
            }),
        };

        let remaining = args.finish();
        if !remaining.is_empty() {
            eprintln!("Warning: unknown argument(s): {:?}.", remaining);
        }

        app_args
    }
}

pub mod ids {
    use crate::hostname::hostname;
    use nanoid::nanoid;
    use uuid::Uuid;

    pub fn get_cuid(as_slug: bool) -> String {
        let id = if as_slug { cuid::slug() } else { cuid::cuid() };
        id.expect("could not acquire cuid:")
    }

    pub fn get_nanoid(length: Option<usize>) -> String {
        match length {
            Some(len) => nanoid!(len),
            None => nanoid!(),
        }
    }

    pub fn get_uuid(as_urn: bool, as_simple: bool) -> String {
        let uuid = Uuid::new_v4();

        if as_urn {
            uuid.to_urn().to_string()
        } else if as_simple {
            uuid.to_simple().to_string()
        } else {
            uuid.to_hyphenated().to_string()
        }
    }

    pub fn get_hostname(token_length: Option<usize>) -> String {
        hostname(token_length.unwrap_or(4))
    }
}