git2 0.1.12

Bindings to libgit2 for interoperating with git repositories. This library is both threadsafe and memory safe and allows both reading and writing git repositories. 
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use std::marker;
use std::mem;
use std::slice;

use {raw, Oid};
use util::Binding;

/// A structure to represent a git [blob][1]
///
/// [1]: http://git-scm.com/book/en/Git-Internals-Git-Objects
pub struct Blob<'repo> {
    raw: *mut raw::git_blob,
    marker: marker::ContravariantLifetime<'repo>,
}

impl<'repo> Blob<'repo> {
    /// Get the id (SHA1) of a repository blob
    pub fn id(&self) -> Oid {
        unsafe { Binding::from_raw(raw::git_blob_id(&*self.raw)) }
    }

    /// Determine if the blob content is most certainly binary or not.
    pub fn is_binary(&self) -> bool {
        unsafe { raw::git_blob_is_binary(&*self.raw) == 1 }
    }

    /// Get the content of this blob.
    pub fn content(&self) -> &[u8] {
        unsafe {
            let data = raw::git_blob_rawcontent(&*self.raw) as *const u8;
            let len = raw::git_blob_rawsize(&*self.raw) as usize;
            slice::from_raw_buf(mem::copy_lifetime(self, &data), len)
        }
    }
}

impl<'repo> Binding for Blob<'repo> {
    type Raw = *mut raw::git_blob;

    unsafe fn from_raw(raw: *mut raw::git_blob) -> Blob<'repo> {
        Blob {
            raw: raw,
            marker: marker::ContravariantLifetime,
        }
    }
    fn raw(&self) -> *mut raw::git_blob { self.raw }
}


#[unsafe_destructor]
impl<'repo> Drop for Blob<'repo> {
    fn drop(&mut self) {
        unsafe { raw::git_blob_free(self.raw) }
    }
}

#[cfg(test)]
mod tests {
    use std::io::{TempDir, File};
    use Repository;

    #[test]
    fn buffer() {
        let td = TempDir::new("test").unwrap();
        let repo = Repository::init(td.path()).unwrap();
        let id = repo.blob(&[5, 4, 6]).unwrap();
        let blob = repo.find_blob(id).unwrap();

        assert_eq!(blob.id(), id);
        assert_eq!(blob.content(), [5, 4, 6].as_slice());

        repo.find_object(id, None).unwrap().as_blob().unwrap();
    }

    #[test]
    fn path() {
        let td = TempDir::new("test").unwrap();
        let path = td.path().join("foo");
        File::create(&path).write(&[7, 8, 9]).unwrap();
        let repo = Repository::init(td.path()).unwrap();
        let id = repo.blob_path(&path).unwrap();
        let blob = repo.find_blob(id).unwrap();
        assert_eq!(blob.content(), [7, 8, 9].as_slice());
    }
}