Hmbown/CodeWhale · error

Failed to run `gh pr checkout`: {e}

Error message

Failed to run `gh pr checkout`: {e}

What it means

Error "Failed to run `gh pr checkout`: {e}" thrown in Hmbown/CodeWhale.

Source

Thrown at crates/tui/src/lib.rs:8193

        .output()
        .map_err(|e| anyhow::anyhow!("Failed to run `gh pr diff`: {e}"))?;
    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr).trim().to_string();
        bail!("gh pr diff #{number} failed: {stderr}");
    }
    Ok(String::from_utf8_lossy(&output.stdout).to_string())
}

fn run_gh_pr_checkout(number: u32, repo: Option<&str>) -> Result<()> {
    let mut cmd = crate::dependencies::Gh::command()
        .ok_or_else(|| anyhow::anyhow!("gh not found on PATH"))?;
    cmd.arg("pr").arg("checkout").arg(number.to_string());
    if let Some(r) = repo {
        cmd.arg("--repo").arg(r);
    }
    let output = cmd
        .output()
        .map_err(|e| anyhow::anyhow!("Failed to run `gh pr checkout`: {e}"))?;
    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr).trim().to_string();
        bail!("gh pr checkout #{number} failed: {stderr}");
    }
    Ok(())
}

/// Format the PR review prompt that lands in the composer. Caps the
/// diff at 200 KiB so a massive PR doesn't blow the model's context
/// window before the user even hits Enter — they can always ask the
/// model to fetch more via `gh pr diff #N` from inside the session.
fn format_pr_prompt(number: u32, view: &GhPullRequest, diff: &str) -> String {
    const MAX_DIFF_BYTES: usize = 200 * 1024;
    let diff_section = if diff.len() > MAX_DIFF_BYTES {
        let cut = (0..=MAX_DIFF_BYTES)
            .rev()
            .find(|&i| diff.is_char_boundary(i))
            .unwrap_or(0);

View on GitHub (pinned to 8880682c63)

When it happens

Trigger: Thrown at crates/tui/src/lib.rs:8193 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Hmbown/CodeWhale@8880682c63 (2026-08-16). Data as JSON: /api/errors/42470db7e1c351ca. Report an issue: GitHub.