compose_yml 0.0.59

Parse, manipulate and serialize docker-compose.yml in a strongly-typed fashion
Documentation 
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use super::common::*;

/// Permissions on devices that are mapped into the Docker container.
#[derive(Debug, Eq, PartialEq, Clone, Copy)]
pub struct DevicePermissions {
    /// Can the container read from this device?
    pub read: bool,
    /// Can the container write to this device?
    pub write: bool,
    /// Can the container call `mknod` for this device?
    pub mknod: bool,
}

impl Default for DevicePermissions {
    fn default() -> DevicePermissions {
        DevicePermissions {
            read: true,
            write: true,
            mknod: true,
        }
    }
}

impl fmt::Display for DevicePermissions {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        if self.read {
            write!(f, "r")?
        }
        if self.write {
            write!(f, "w")?
        }
        if self.mknod {
            write!(f, "m")?
        }
        Ok(())
    }
}

impl FromStr for DevicePermissions {
    type Err = Error;

    fn from_str(s: &str) -> Result<Self> {
        lazy_static! {
            static ref PERMS: Regex = Regex::new("^(r)?(w)?(m)?").unwrap();
        }
        let caps = PERMS
            .captures(s)
            .ok_or_else(|| Error::invalid_value("restart-mode", s))?;
        Ok(DevicePermissions {
            read: caps.get(1).is_some(),
            write: caps.get(2).is_some(),
            mknod: caps.get(3).is_some(),
        })
    }
}

#[test]
fn device_permissions_has_a_string_representation() {
    let pairs = vec![
        (Default::default(), "rwm"),
        (
            DevicePermissions {
                read: false,
                ..Default::default()
            },
            "wm",
        ),
        (
            DevicePermissions {
                write: false,
                ..Default::default()
            },
            "rm",
        ),
        (
            DevicePermissions {
                mknod: false,
                ..Default::default()
            },
            "rw",
        ),
    ];
    for (mode, s) in pairs {
        assert_eq!(mode.to_string(), s);
        assert_eq!(mode, DevicePermissions::from_str(s).unwrap());
    }
}