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use std::path::{Path, PathBuf};
pub fn derive_label_from_cwd(cwd: &Path) -> String {
if let Some(repo_root) = git_repo_root(cwd) {
if let Some(name) = repo_root.file_name().and_then(|n| n.to_str()) {
return name.to_string();
}
}
if let Ok(home) = std::env::var("HOME") {
let home = Path::new(&home);
if cwd == home {
return "~".to_string();
}
}
cwd.file_name()
.and_then(|n| n.to_str())
.filter(|s| !s.is_empty())
.map(|s| s.to_string())
.unwrap_or_else(|| cwd.display().to_string())
}
pub fn git_branch(cwd: &Path) -> Option<String> {
let repo_root = git_repo_root(cwd)?;
let git_dir = git_dir_for_repo_root(&repo_root)?;
let head = std::fs::read_to_string(git_dir.join("HEAD")).ok()?;
parse_git_head_branch(&head)
}
fn git_dir_for_repo_root(repo_root: &Path) -> Option<PathBuf> {
let git_path = repo_root.join(".git");
if git_path.is_dir() {
return Some(git_path);
}
let gitdir = std::fs::read_to_string(&git_path).ok()?;
let relative = gitdir.trim().strip_prefix("gitdir:")?.trim();
let resolved = Path::new(relative);
Some(if resolved.is_absolute() {
resolved.to_path_buf()
} else {
repo_root.join(resolved)
})
}
fn parse_git_head_branch(head: &str) -> Option<String> {
let branch = head.trim().strip_prefix("ref: refs/heads/")?;
(!branch.is_empty()).then(|| branch.to_string())
}
fn git_repo_root(start: &Path) -> Option<PathBuf> {
let mut current = if start.is_dir() {
start.to_path_buf()
} else {
start.parent()?.to_path_buf()
};
loop {
if current.join(".git").exists() {
return Some(current);
}
if !current.pop() {
return None;
}
}
}
pub(super) fn git_ahead_behind(cwd: &Path) -> Option<(usize, usize)> {
git_repo_root(cwd)?;
let output = std::process::Command::new("git")
.arg("-C")
.arg(cwd)
.args(["rev-list", "--left-right", "--count", "HEAD...@{upstream}"])
.output()
.ok()?;
if !output.status.success() {
return None;
}
let stdout = String::from_utf8(output.stdout).ok()?;
parse_git_ahead_behind_output(&stdout)
}
fn parse_git_ahead_behind_output(stdout: &str) -> Option<(usize, usize)> {
let mut parts = stdout.split_whitespace();
let ahead = parts.next()?.parse().ok()?;
let behind = parts.next()?.parse().ok()?;
Some((ahead, behind))
}
#[cfg(test)]
mod tests {
use std::time::{SystemTime, UNIX_EPOCH};
use super::*;
fn temp_test_dir(name: &str) -> PathBuf {
let unique = format!(
"herdr-workspace-tests-{}-{}-{}",
name,
std::process::id(),
SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap()
.as_nanos()
);
let path = std::env::temp_dir().join(unique);
std::fs::create_dir_all(&path).unwrap();
path
}
#[test]
fn git_branch_reads_head_from_standard_repo() {
let root = temp_test_dir("standard-repo");
std::fs::create_dir_all(root.join(".git")).unwrap();
std::fs::write(root.join(".git/HEAD"), "ref: refs/heads/main\n").unwrap();
assert_eq!(git_branch(&root).as_deref(), Some("main"));
std::fs::remove_dir_all(root).unwrap();
}
#[test]
fn git_branch_reads_head_from_worktree_gitdir_file() {
let root = temp_test_dir("worktree");
let worktree_git_dir = root.join(".bare/worktrees/feature");
std::fs::create_dir_all(&worktree_git_dir).unwrap();
std::fs::write(root.join(".git"), "gitdir: .bare/worktrees/feature\n").unwrap();
std::fs::write(worktree_git_dir.join("HEAD"), "ref: refs/heads/feature\n").unwrap();
assert_eq!(git_branch(&root).as_deref(), Some("feature"));
std::fs::remove_dir_all(root).unwrap();
}
#[test]
fn git_branch_returns_none_for_detached_head() {
let root = temp_test_dir("detached-head");
std::fs::create_dir_all(root.join(".git")).unwrap();
std::fs::write(root.join(".git/HEAD"), "3e1b9a8d\n").unwrap();
assert_eq!(git_branch(&root), None);
std::fs::remove_dir_all(root).unwrap();
}
}
|
