use super::super::backend::{AiBackend, BackendCtx, Response};
use super::super::flatten::{flatten_for_subprocess, SystemDelivery};
use super::super::request::Request;
use super::super::runner::run;
pub struct GeminiBackend;
impl GeminiBackend {
pub fn build_argv(model: Option<&str>, system: Option<&str>) -> Vec<String> {
let mut argv = vec!["gemini".to_string(), "--prompt".to_string()];
if let Some(m) = model {
argv.push("--model".to_string());
argv.push(m.to_string());
}
if let Some(s) = system {
argv.push("--system".to_string());
argv.push(s.to_string());
}
argv
}
}
impl AiBackend for GeminiBackend {
fn name(&self) -> &'static str { "gemini" }
fn invoke(&self, req: &Request, ctx: &BackendCtx<'_>) -> Result<Response, String> {
let payload = flatten_for_subprocess(req, SystemDelivery::Flag);
let argv = Self::build_argv(ctx.effective_model.as_deref(), payload.system.as_deref());
match run(&argv, &payload.body, ctx.effective_timeout) {
Ok(r) => Ok(Response {
text: r.stdout.trim_end_matches('\n').to_string(),
backend: "gemini".into(),
model: ctx.effective_model.clone(),
duration: r.duration,
exit_code: r.exit_code,
}),
Err(e) => Err(e.to_string()),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn argv_minimal() {
assert_eq!(GeminiBackend::build_argv(None, None), vec!["gemini", "--prompt"]);
}
#[test]
fn argv_with_model() {
assert_eq!(
GeminiBackend::build_argv(Some("gemini-2.0-flash"), None),
vec!["gemini", "--prompt", "--model", "gemini-2.0-flash"]
);
}
#[test]
fn argv_with_system() {
assert_eq!(
GeminiBackend::build_argv(None, Some("be brief")),
vec!["gemini", "--prompt", "--system", "be brief"]
);
}
}