zagens-cli 0.8.3

Zagens headless CLI + HTTP/SSE runtime sidecar (`zagens`, `zagens-runtime` binaries)
Documentation 
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//! Workspace git status (R-003 A4.5).

use std::path::PathBuf;
use std::process::Command;

use axum::Json;
use axum::extract::State;
use serde::Serialize;

use super::{ApiError, RuntimeApiState};

#[derive(Debug, Serialize)]
pub(crate) struct WorkspaceStatusResponse {
    workspace: PathBuf,
    git_repo: bool,
    branch: Option<String>,
    staged: usize,
    unstaged: usize,
    untracked: usize,
    ahead: Option<u32>,
    behind: Option<u32>,
}

pub(crate) async fn workspace_status(
    State(state): State<RuntimeApiState>,
) -> Result<Json<WorkspaceStatusResponse>, ApiError> {
    Ok(Json(collect_workspace_status(&state.workspace)))
}

pub(crate) fn collect_workspace_status(workspace: &std::path::Path) -> WorkspaceStatusResponse {
    let mut status = WorkspaceStatusResponse {
        workspace: workspace.to_path_buf(),
        git_repo: false,
        branch: None,
        staged: 0,
        unstaged: 0,
        untracked: 0,
        ahead: None,
        behind: None,
    };

    let Some(repo_check) = run_git(workspace, &["rev-parse", "--is-inside-work-tree"]) else {
        return status;
    };
    if repo_check.trim() != "true" {
        return status;
    }

    status.git_repo = true;
    status.branch = run_git(workspace, &["rev-parse", "--abbrev-ref", "HEAD"])
        .map(|s| s.trim().to_string())
        .filter(|s| !s.is_empty());

    if let Some(porcelain) = run_git(workspace, &["status", "--porcelain=v1"]) {
        for line in porcelain.lines() {
            if line.starts_with("??") {
                status.untracked += 1;
                continue;
            }
            let chars: Vec<char> = line.chars().collect();
            if chars.len() >= 2 {
                if chars[0] != ' ' {
                    status.staged += 1;
                }
                if chars[1] != ' ' {
                    status.unstaged += 1;
                }
            }
        }
    }

    if let Some(counts) = run_git(
        workspace,
        &["rev-list", "--left-right", "--count", "@{upstream}...HEAD"],
    ) {
        let mut parts = counts.split_whitespace();
        if let (Some(behind), Some(ahead)) = (parts.next(), parts.next()) {
            status.behind = behind.parse::<u32>().ok();
            status.ahead = ahead.parse::<u32>().ok();
        }
    }

    status
}

pub(crate) fn run_git(workspace: &std::path::Path, args: &[&str]) -> Option<String> {
    let output = Command::new("git")
        .args(args)
        .current_dir(workspace)
        .output()
        .ok()?;
    if !output.status.success() {
        return None;
    }
    String::from_utf8(output.stdout).ok()
}