aether_cli/headless/

mod.rs

pub mod error;
pub mod run;

use aether_core::agent_spec::AgentSpec;
use aether_project::load_agent_catalog;
use error::CliError;
use std::io::{IsTerminal, Read as _, stdin};
use std::path::PathBuf;
use std::process::ExitCode;

use crate::resolve::resolve_agent_spec;

#[derive(Clone)]
pub enum OutputFormat {
    Text,
    Pretty,
    Json,
}

pub struct RunConfig {
    pub prompt: String,
    pub cwd: PathBuf,
    pub mcp_config: Option<PathBuf>,
    pub spec: AgentSpec,
    pub system_prompt: Option<String>,
    pub output: OutputFormat,
    pub verbose: bool,
}

pub async fn run_headless(args: HeadlessArgs) -> Result<ExitCode, CliError> {
    let prompt = resolve_prompt(&args)?;
    let cwd = args.cwd.canonicalize().map_err(CliError::IoError)?;
    let spec = resolve_spec(args.agent.as_deref(), args.model.as_deref(), &cwd)?;

    let output = match args.output {
        CliOutputFormat::Text => OutputFormat::Text,
        CliOutputFormat::Pretty => OutputFormat::Pretty,
        CliOutputFormat::Json => OutputFormat::Json,
    };

    let config = RunConfig {
        prompt,
        cwd,
        mcp_config: args.mcp_config,
        spec,
        system_prompt: args.system_prompt,
        output,
        verbose: args.verbose,
    };

    run::run(config).await
}

#[derive(Clone, clap::ValueEnum)]
pub enum CliOutputFormat {
    Text,
    Pretty,
    Json,
}

#[derive(clap::Args)]
pub struct HeadlessArgs {
    /// Prompt to send (reads stdin if omitted and stdin is not a TTY)
    pub prompt: Vec<String>,

    /// Named agent from settings.json (defaults to first user-invocable agent)
    #[arg(short = 'a', long = "agent")]
    pub agent: Option<String>,

    /// Model for ad-hoc runs (e.g. "anthropic:claude-sonnet-4-5"). Mutually exclusive with --agent.
    #[arg(short, long)]
    pub model: Option<String>,

    /// Working directory
    #[arg(short = 'C', long = "cwd", default_value = ".")]
    pub cwd: PathBuf,

    /// Path to mcp.json (auto-detected if omitted)
    #[arg(long = "mcp-config")]
    pub mcp_config: Option<PathBuf>,

    /// Additional system prompt
    #[arg(long = "system-prompt")]
    pub system_prompt: Option<String>,

    /// Output format
    #[arg(long, default_value = "text")]
    pub output: CliOutputFormat,

    /// Verbose logging to stderr
    #[arg(short, long)]
    pub verbose: bool,
}

fn resolve_prompt(args: &HeadlessArgs) -> Result<String, CliError> {
    match args.prompt.as_slice() {
        args if !args.is_empty() => Ok(args.join(" ")),

        _ if !stdin().is_terminal() => {
            let mut buf = String::new();
            stdin().read_to_string(&mut buf).map_err(CliError::IoError)?;

            match buf.trim() {
                "" => Err(CliError::NoPrompt),
                s => Ok(s.to_string()),
            }
        }
        _ => Err(CliError::NoPrompt),
    }
}

fn resolve_spec(agent: Option<&str>, model: Option<&str>, cwd: &std::path::Path) -> Result<AgentSpec, CliError> {
    if agent.is_some() && model.is_some() {
        return Err(CliError::ConflictingArgs("Cannot specify both --agent and --model".to_string()));
    }

    let catalog = load_agent_catalog(cwd).map_err(|e| CliError::AgentError(e.to_string()))?;

    match model {
        Some(m) => {
            let parsed = m.parse().map_err(|e: String| CliError::ModelError(e))?;
            Ok(catalog.resolve_default(&parsed, None, cwd))
        }
        None => resolve_agent_spec(&catalog, agent, cwd),
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn write_file(dir: &std::path::Path, path: &str, content: &str) {
        let full = dir.join(path);
        if let Some(parent) = full.parent() {
            std::fs::create_dir_all(parent).unwrap();
        }
        std::fs::write(full, content).unwrap();
    }

    fn setup_dir_with_agents() -> tempfile::TempDir {
        let dir = tempfile::tempdir().unwrap();
        write_file(dir.path(), "PROMPT.md", "Be helpful");
        write_file(
            dir.path(),
            ".aether/settings.json",
            r#"{"agents": [
                {"name": "alpha", "description": "Alpha agent", "model": "anthropic:claude-sonnet-4-5", "userInvocable": true, "prompts": ["PROMPT.md"]},
                {"name": "beta", "description": "Beta agent", "model": "anthropic:claude-sonnet-4-5", "userInvocable": true, "prompts": ["PROMPT.md"]}
            ]}"#,
        );
        dir
    }

    #[test]
    fn resolve_spec_with_named_agent() {
        let dir = setup_dir_with_agents();
        let spec = resolve_spec(Some("beta"), None, dir.path()).unwrap();
        assert_eq!(spec.name, "beta");
    }

    #[test]
    fn resolve_spec_with_model_creates_default() {
        let dir = setup_dir_with_agents();
        let spec = resolve_spec(None, Some("anthropic:claude-sonnet-4-5"), dir.path()).unwrap();
        assert_eq!(spec.name, "__default__");
    }

    #[test]
    fn resolve_spec_defaults_to_first_user_invocable() {
        let dir = setup_dir_with_agents();
        let spec = resolve_spec(None, None, dir.path()).unwrap();
        assert_eq!(spec.name, "alpha");
    }

    #[test]
    fn resolve_spec_defaults_to_fallback_without_settings() {
        let dir = tempfile::tempdir().unwrap();
        let spec = resolve_spec(None, None, dir.path()).unwrap();
        assert_eq!(spec.name, "__default__");
    }

    #[test]
    fn resolve_spec_rejects_both_agent_and_model() {
        let dir = setup_dir_with_agents();
        let err = resolve_spec(Some("alpha"), Some("anthropic:claude-sonnet-4-5"), dir.path()).unwrap_err();
        assert!(err.to_string().contains("Cannot specify both"), "unexpected error: {err}");
    }

    #[test]
    fn resolve_spec_rejects_invalid_model() {
        let dir = tempfile::tempdir().unwrap();
        let err = resolve_spec(None, Some("not-a-valid-model"), dir.path()).unwrap_err();
        assert!(matches!(err, CliError::ModelError(_)));
    }

    #[test]
    fn resolve_spec_rejects_unknown_agent() {
        let dir = setup_dir_with_agents();
        let err = resolve_spec(Some("nonexistent"), None, dir.path()).unwrap_err();
        assert!(matches!(err, CliError::AgentError(_)));
    }
}