clack-common 0.1.0

Various utilities for working with the CLAP audio plugin API, for both plugins and hosts.
Documentation 
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use clap_sys::version::clap_version;
use std::cmp::Ordering;
use std::fmt::{Display, Formatter};

/// A CLAP version identifier.
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub struct ClapVersion {
    /// The major version number.
    ///
    /// A change in this number indicates an incompatible ABI or API change.
    ///
    /// Version `0.x.y` is the development stage, and ABI or API stability is not guaranteed.
    pub major: u32,

    /// The minor version number.
    ///
    /// A change in this number indicates a compatible API extension.
    pub minor: u32,

    /// The revision version number.
    ///
    /// A change in this number indicates a bug fix or other compatible change.
    pub revision: u32,
}

impl ClapVersion {
    /// The version of the CLAP API that is implemented by this Clack implementation.
    pub const CURRENT: ClapVersion = Self::from_raw(clap_sys::version::CLAP_VERSION);

    /// Creates a [`ClapVersion`] from its raw, C-FFI compatible representation.
    #[inline]
    pub const fn from_raw(raw: clap_version) -> Self {
        Self {
            major: raw.major,
            minor: raw.minor,
            revision: raw.revision,
        }
    }

    /// Returns this [`ClapVersion`] as its raw, C-FFI compatible representation.
    #[inline]
    pub const fn to_raw(self) -> clap_version {
        clap_version {
            major: self.major,
            minor: self.minor,
            revision: self.revision,
        }
    }

    /// Returns whether this [`ClapVersion`] is compatible with the current version of this `clack`
    /// library.
    ///
    /// This currently returns true if this version's `major` field is `1`, and false
    /// otherwise.
    #[inline]
    pub const fn is_compatible(&self) -> bool {
        clap_sys::version::clap_version_is_compatible(self.to_raw())
    }
}

impl PartialOrd for ClapVersion {
    #[inline]
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl Ord for ClapVersion {
    fn cmp(&self, other: &Self) -> Ordering {
        match self.major.cmp(&other.major) {
            Ordering::Equal => match self.minor.cmp(&other.minor) {
                Ordering::Equal => self.revision.cmp(&other.revision),
                o => o,
            },
            o => o,
        }
    }
}

impl Display for ClapVersion {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}.{}.{}", self.major, self.minor, self.revision)
    }
}

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

    #[test]
    pub fn display() {
        let version = ClapVersion {
            major: 1,
            minor: 5,
            revision: 3,
        };
        let display = format!("{version}");

        assert_eq!(&"1.5.3", &display);
    }

    #[test]
    pub fn version_ordering() {
        let version = ClapVersion {
            major: 1,
            minor: 5,
            revision: 3,
        };

        assert_eq!(
            version,
            ClapVersion {
                major: 1,
                minor: 5,
                revision: 3,
            }
        );

        assert!(
            version
                > ClapVersion {
                    major: 1,
                    minor: 4,
                    revision: 3
                }
        );

        assert!(
            version
                < ClapVersion {
                    major: 2,
                    minor: 1,
                    revision: 1
                }
        );

        assert!(
            version
                < ClapVersion {
                    major: 1,
                    minor: 5,
                    revision: 5
                }
        );

        assert_eq!(
            Ordering::Equal,
            version.cmp(&ClapVersion {
                major: 1,
                minor: 5,
                revision: 3
            })
        );
    }
}