libvctrl 0.3.0

A robust, content-addressed version control engine for arbitrary data, designed for embedding into applications.
Documentation 
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use crate::command::Command;
use crate::domain::hash::Hash;
use crate::error::VctrlError;
use crate::storage::traits::{ObjectStore, RefStore};

fn validate(name: &str) -> Result<(), VctrlError> {
    if !name.starts_with("refs/heads/") {
        Err(VctrlError::InvalidRef(
            "branch name must start with refs/heads/".into(),
        ))
    } else {
        Ok(())
    }
}

pub struct CreateBranch {
    pub name: String,
    pub hash: Hash,
}
impl Command for CreateBranch {
    type Output = ();
    fn execute(
        &self,
        _store: &mut dyn ObjectStore,
        refs: &mut dyn RefStore,
    ) -> Result<(), VctrlError> {
        validate(&self.name)?;
        refs.set_ref(&self.name, &self.hash)
    }
}

pub struct DeleteBranch {
    pub name: String,
}
impl Command for DeleteBranch {
    type Output = ();
    fn execute(
        &self,
        _store: &mut dyn ObjectStore,
        refs: &mut dyn RefStore,
    ) -> Result<(), VctrlError> {
        validate(&self.name)?;
        refs.delete_ref(&self.name)
    }
}

pub struct GetBranch {
    pub name: String,
}
impl Command for GetBranch {
    type Output = Option<Hash>;
    fn execute(
        &self,
        _store: &mut dyn ObjectStore,
        refs: &mut dyn RefStore,
    ) -> Result<Option<Hash>, VctrlError> {
        validate(&self.name)?;
        refs.get_ref(&self.name)
    }
}

pub struct SetHead {
    pub target: String,
}
impl Command for SetHead {
    type Output = ();
    fn execute(
        &self,
        store: &mut dyn ObjectStore,
        refs: &mut dyn RefStore,
    ) -> Result<(), VctrlError> {
        if self.target.starts_with("refs/heads/") {
            refs.set_head(&self.target)
        } else {
            let hash = Hash::from_hex(&self.target).map_err(|_| {
                VctrlError::InvalidRef("HEAD target must be a branch name or valid hash".into())
            })?;
            if !store.exists(&hash)? {
                return Err(VctrlError::NotFound(format!(
                    "commit '{}' does not exist",
                    self.target
                )));
            }
            refs.set_head(&self.target)
        }
    }
}