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use std::path::Path;
use git2::{Branch, BranchType, Commit, ErrorCode, Oid, Reference, Repository};
/// Helper struct for tracking Git objects
pub struct Tracker {
repository: Repository,
}
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("libgit2 error")]
Git(#[from] git2::Error),
#[error("Repository path not found at `{0}`")]
RepositoryPathNotFound(String),
}
impl Tracker {
/// Create a new [`Tracker`] using the repository at [`path`]
///
/// # Errors
///
/// Will return [`Err`] if the repository can not be opened
pub fn from_path(path: &str) -> Result<Self, Error> {
let repository_path = Path::new(path);
if repository_path.exists() {
let repository = Repository::open(repository_path)?;
Ok(Self { repository })
} else {
Err(Error::RepositoryPathNotFound(path.to_string()))
}
}
/// Finds a branch of name [`name`]
///
/// # Errors
///
/// Will return [`Err`] if the branch cannot be found locally
pub fn branch_by_name(&self, name: &str) -> Result<Branch, Error> {
Ok(self.repository.find_branch(name, BranchType::Remote)?)
}
/// Finds a commit with a SHA match [`sha`]
///
/// # Errors
///
/// Will return [`Err`] if [`sha`] cannot be converted an [`Oid`] or
/// a commit matching it cannot be found
pub fn commit_by_sha(&self, sha: &str) -> Result<Commit, Error> {
let oid = Oid::from_str(sha)?;
let commit = self.repository.find_commit(oid)?;
Ok(commit)
}
/// Check if [`Reference`] [`ref`] contains [`Commit`] [`commit`]
///
/// # Errors
///
/// Will return [`Err`] if the reference cannot be resolved to a commit or the descendants
/// of the reference cannot be resolved
pub fn ref_contains_commit(
&self,
reference: &Reference,
commit: &Commit,
) -> Result<bool, Error> {
let head = reference.peel_to_commit()?;
// NOTE: we have to check this as `Repository::graph_descendant_of()` (like the name says)
// only finds *descendants* of it's parent commit, and will not tell us if the parent commit
// *is* the child commit. i have no idea why i didn't think of this, but that's why this
// comment is here now
let is_head = head.id() == commit.id();
let has_commit = self
.repository
.graph_descendant_of(head.id(), commit.id())?;
Ok(is_head || has_commit)
}
/// Check if a [`Branch`] named [`branch_name`] has a commit with the SHA [`commit_sha`]
///
/// # Errors
///
/// Will return [`Err`] if the commit SHA cannot be resolved to an object id, the branch name cannot
/// be resolved to a branch, or the descendants of the resolved branch cannot be resolved
pub fn branch_contains_sha(&self, branch_name: &str, commit_sha: &str) -> Result<bool, Error> {
let commit = match self.commit_by_sha(commit_sha) {
Ok(commit) => commit,
Err(why) => {
// NOTE: we assume commits not found are just not in the branch *yet*, not an error
// this is because github decides to report merge commit shas for unmerged PRs...yeah
if let Error::Git(git_error) = &why {
if git_error.code() == ErrorCode::NotFound {
return Ok(false);
}
}
return Err(why);
}
};
let branch = self.branch_by_name(branch_name)?;
let has_pr = self.ref_contains_commit(&branch.into_reference(), &commit)?;
Ok(has_pr)
}
}
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