ferrflow 7.3.1

Universal semantic versioning for monorepos and classic repos
Documentation 
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use anyhow::{Context, Result};
use std::path::{Path, PathBuf};

use crate::error_code::{self, ErrorCodeExt};

pub type Repository = gix::Repository;

pub fn open_repo(path: &Path) -> Result<Repository> {
    gix::discover(path)
        .with_context(|| format!("Not a git repository: {}", path.display()))
        .error_code(error_code::GIT_NOT_A_REPO)
}

pub fn get_repo_root(repo: &Repository) -> Result<PathBuf> {
    repo.workdir()
        .map(|p| p.to_path_buf())
        .ok_or_else(|| anyhow::anyhow!("Bare repositories are not supported"))
        .error_code(error_code::GIT_BARE_REPO)
}

pub fn resolve_current_branch(repo: &Repository, fallback: &str) -> String {
    if let Ok(head) = repo.head()
        && let Some(name) = head.referent_name()
    {
        let full = name.as_bstr().to_string();
        if let Some(short) = full.strip_prefix("refs/heads/") {
            return short.to_string();
        }
        return full;
    }

    if let Ok(full_ref) = std::env::var("GITHUB_REF")
        && let Some(branch) = full_ref.strip_prefix("refs/heads/")
        && !branch.is_empty()
    {
        return branch.to_string();
    }
    if let Ok(full_ref) = std::env::var("CI_COMMIT_REF_NAME")
        && std::env::var("CI_COMMIT_TAG").is_err()
        && !full_ref.is_empty()
    {
        return full_ref;
    }

    let branch_only_ci_vars = [
        "BRANCH_NAME",
        "CIRCLE_BRANCH",
        "BITBUCKET_BRANCH",
        "BUILDKITE_BRANCH",
        "TRAVIS_BRANCH",
        "CI_COMMIT_BRANCH",
    ];

    for var in branch_only_ci_vars {
        if let Ok(val) = std::env::var(var)
            && !val.is_empty()
        {
            return val;
        }
    }

    fallback.to_string()
}