vig 0.5.0

Git TUI side-by-side diff viewer
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use crate::github::domain::types::*;
use std::process::Command;

/// Run a `gh` command and return its stdout on success.
fn run_gh(args: &[&str], context: &str) -> Result<Vec<u8>, String> {
    let output = Command::new("gh")
        .args(args)
        .output()
        .map_err(|e| format!("{context}: {e}"))?;
    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        return Err(stderr.trim().to_string());
    }
    Ok(output.stdout)
}

/// Run a `gh` command and parse the JSON output.
fn run_gh_json<T: serde::de::DeserializeOwned>(args: &[&str], context: &str) -> Result<T, String> {
    let stdout = run_gh(args, context)?;
    serde_json::from_slice(&stdout).map_err(|e| format!("JSON parse error: {e}"))
}

/// Open a GitHub issue or PR in the browser.
fn open_in_browser(entity: &str, number: u64) -> Result<(), String> {
    Command::new("gh")
        .args([entity, "view", &number.to_string(), "--web"])
        .stdin(std::process::Stdio::null())
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .spawn()
        .map_err(|e| format!("Failed to open {entity} in browser: {e}"))?;
    Ok(())
}

pub fn check_gh_available() -> Result<(), String> {
    run_gh(&["auth", "status"], "gh not found").map(|_| ())
}

pub fn list_issues(limit: usize) -> Result<Vec<GhIssueListItem>, String> {
    run_gh_json(
        &[
            "issue",
            "list",
            "--json",
            "number,title,state,author,labels,createdAt",
            "--limit",
            &limit.to_string(),
        ],
        "gh issue list failed",
    )
}

pub fn list_prs(limit: usize) -> Result<Vec<GhPrListItem>, String> {
    run_gh_json(
        &[
            "pr",
            "list",
            "--json",
            "number,title,state,author,labels,headRefName,createdAt,reviewDecision,isDraft",
            "--limit",
            &limit.to_string(),
        ],
        "gh pr list failed",
    )
}

pub fn get_issue(number: u64) -> Result<GhIssueDetail, String> {
    run_gh_json(
        &[
            "issue",
            "view",
            &number.to_string(),
            "--json",
            "number,title,state,author,body,comments,labels,createdAt",
        ],
        "gh issue view failed",
    )
}

pub fn get_pr(number: u64) -> Result<GhPrDetail, String> {
    run_gh_json(
        &[
            "pr",
            "view",
            &number.to_string(),
            "--json",
            "number,title,state,author,body,comments,reviews,labels,createdAt,reviewDecision,statusCheckRollup,additions,deletions,changedFiles,headRefName",
        ],
        "gh pr view failed",
    )
}

pub fn open_issue_in_browser(number: u64) -> Result<(), String> {
    open_in_browser("issue", number)
}

pub fn open_pr_in_browser(number: u64) -> Result<(), String> {
    open_in_browser("pr", number)
}

/// Get the "owner/repo" string for the current repository using `gh`.
pub fn repo_nwo() -> Option<String> {
    let stdout = run_gh(
        &[
            "repo",
            "view",
            "--json",
            "nameWithOwner",
            "-q",
            ".nameWithOwner",
        ],
        "gh repo view",
    )
    .ok()?;
    Some(String::from_utf8_lossy(&stdout).trim().to_string())
}