sysid 0.1.0

A simple library providing functionality to generate a 'system ID' that can be used to uniquely identify a computer.
Documentation 
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use sha2::{Digest, Sha256};

mod macos;

#[derive(Default)]
pub struct SystemIDBuilder {
    components: Vec<String>,
}

impl SystemIDBuilder {
    pub fn new() -> Self {
        SystemIDBuilder {
            components: Vec::new(),
        }
    }

    pub fn on_macos<F>(&mut self, mut run: F) -> &mut Self
    where
        F: FnMut(&mut Self),
    {
        #[cfg(target_os = "macos")]
        {
            run(self);
        }
        self
    }

    pub fn build(&self) -> String {
        let mut hasher = Sha256::new();
        hasher.update(self.components.join("-").as_bytes());
        hasher
            .finalize()
            .iter()
            .map(|b| format!("{:02x}", b))
            .collect()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn macos_id() {
        println!(
            "HWID: {}",
            SystemIDBuilder::new()
                .on_macos(|b| {
                    b.add_platform_serial()
                        .add_platform_uuid()
                        .add_drive_serial()
                        .add_cpu_brand();
                })
                .build()
        );
    }
}