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use anyhow::{Context, Result};
use git2::{BranchType, Config, Direction, Error, ErrorClass, ErrorCode, Remote, Repository};
use log::*;
use crate::config;
use crate::simple_glob::{expand_refspec, ExpansionSide};
pub fn get_fetch_upstream(
repo: &Repository,
config: &Config,
branch: &str,
) -> Result<Option<String>> {
let remote_name = config::get_remote(config, branch)?;
get_upstream(repo, config, &remote_name, branch)
}
pub fn get_remote<'a>(repo: &'a Repository, remote_name: &str) -> Result<Option<Remote<'a>>> {
fn error_is_missing_remote(err: &Error) -> bool {
err.class() == ErrorClass::Config && err.code() == ErrorCode::InvalidSpec
}
match repo.find_remote(remote_name) {
Ok(remote) => Ok(Some(remote)),
Err(err) if error_is_missing_remote(&err) => Ok(None),
Err(err) => Err(err.into()),
}
}
fn get_upstream(
repo: &Repository,
config: &Config,
remote_name: &str,
branch: &str,
) -> Result<Option<String>> {
let remote = if let Some(remote) = get_remote(repo, remote_name)? {
remote
} else {
return Ok(None);
};
let merge: String = if let Some(merge) = config::get_merge(config, &branch)? {
merge
} else {
return Ok(None);
};
assert!(
merge.starts_with("refs/"),
"'git config branch.{}.merge' should start with 'refs/'",
branch
);
if let Some(expanded) = expand_refspec(&remote, &merge, Direction::Fetch, ExpansionSide::Right)?
{
let exists = repo.find_reference(&expanded).is_ok();
if exists {
Ok(Some(expanded))
} else {
Ok(None)
}
} else {
Ok(None)
}
}
pub fn get_push_upstream(
repo: &Repository,
config: &Config,
branch: &str,
) -> Result<Option<String>> {
if let Some(RemoteBranch {
remote: remote_name,
refname,
}) = get_push_remote_branch(repo, config, branch)?
{
if let Some(upstream) = get_upstream(repo, config, &remote_name, &refname)? {
return Ok(Some(upstream));
}
}
Ok(None)
}
#[derive(Eq, PartialEq, Ord, PartialOrd, Clone, Hash, Debug)]
pub struct RemoteBranch {
pub remote: String,
pub refname: String,
}
impl std::fmt::Display for RemoteBranch {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}, {}", self.remote, self.refname)
}
}
impl RemoteBranch {
pub fn to_remote_tracking(&self, repo: &Repository) -> Result<Option<String>> {
let remote = get_remote(repo, &self.remote)?;
if let Some(remote) = remote {
if let Some(expanded) = expand_refspec(
&remote,
&self.refname,
Direction::Fetch,
ExpansionSide::Right,
)? {
return Ok(Some(expanded));
}
}
Ok(None)
}
pub fn from_remote_tracking(repo: &Repository, remote_tracking: &str) -> Result<RemoteBranch> {
assert!(remote_tracking.starts_with("refs/remotes/"));
for remote_name in repo.remotes()?.iter() {
let remote_name = remote_name.context("non-utf8 remote name")?;
let remote = repo.find_remote(&remote_name)?;
if let Some(expanded) = expand_refspec(
&remote,
remote_tracking,
Direction::Fetch,
ExpansionSide::Left,
)? {
return Ok(RemoteBranch {
remote: remote.name().context("non-utf8 remote name")?.to_string(),
refname: expanded,
});
}
}
unreachable!("matching refspec is not found");
}
}
fn get_push_remote_branch(
repo: &Repository,
config: &Config,
branch: &str,
) -> Result<Option<RemoteBranch>> {
let remote_name = config::get_push_remote(config, branch)?;
let remote = if let Some(remote) = get_remote(repo, &remote_name)? {
remote
} else {
return Ok(None);
};
let reference = repo
.find_branch(branch, BranchType::Local)?
.into_reference();
let refname = reference.name().context("non utf-8 refname")?;
if let Some(remote_branch) =
expand_refspec(&remote, refname, Direction::Push, ExpansionSide::Right)?
{
return Ok(Some(RemoteBranch {
remote: remote_name.to_string(),
refname: remote_branch,
}));
}
let push_default = config::get(config, "push.default")
.with_default(&String::from("simple"))
.read()?
.expect("has default");
match push_default.as_str() {
"current" => Ok(Some(RemoteBranch {
remote: remote_name.to_string(),
refname: branch.to_string(),
})),
"upstream" | "tracking" | "simple" | "matching" => {
if let Some(merge) = config::get_merge(config, &branch)? {
Ok(Some(RemoteBranch {
remote: remote_name.clone(),
refname: merge,
}))
} else {
warn!("The current branch {} has no upstream branch.", branch);
Ok(None)
}
}
"nothing" => unimplemented!("push.default=nothing is not implemented."),
_ => panic!("unexpected config push.default"),
}
}