cli_agents/adapters/gemini/
mod.rs

1mod parse;
2
3use crate::DEFAULT_MAX_OUTPUT_BYTES;
4use crate::adapters::CliAdapter;
5use crate::discovery::discover_binary;
6use crate::error::{Error, Result};
7use crate::events::StreamEvent;
8use crate::types::{CliName, McpServer, RunOptions, RunResult};
9use std::collections::HashMap;
10use tokio_util::sync::CancellationToken;
11
12pub struct GeminiAdapter;
13
14impl CliAdapter for GeminiAdapter {
15    fn name(&self) -> CliName {
16        CliName::Gemini
17    }
18
19    async fn run(
20        &self,
21        opts: &RunOptions,
22        emit: &(dyn Fn(StreamEvent) + Send + Sync),
23        cancel: CancellationToken,
24    ) -> Result<RunResult> {
25        let binary = match &opts.executable_path {
26            Some(p) => p.clone(),
27            None => discover_binary(CliName::Gemini).await.ok_or(Error::NoCli)?,
28        };
29
30        // Write temp configs if needed.
31        // Hold the TempDir so it lives until the child process exits.
32        let (config_env, _tmp_dir) = write_configs(opts).await?;
33
34        let cli_args = build_args(opts);
35        let mut extra_env = opts.env.clone().unwrap_or_default();
36        extra_env.extend(config_env);
37        let max_bytes = opts.max_output_bytes.unwrap_or(DEFAULT_MAX_OUTPUT_BYTES);
38
39        let mut state = parse::ParseState::default();
40
41        let outcome = crate::adapters::spawn_and_stream(
42            crate::adapters::SpawnParams {
43                cli_label: "gemini",
44                binary: &binary,
45                args: &cli_args,
46                extra_env: &extra_env,
47                cwd: opts.cwd.as_deref().unwrap_or("."),
48                max_bytes,
49                cancel: &cancel,
50            },
51            |line| parse::parse_line(line, &mut state, emit),
52        )
53        .await?;
54
55        match outcome {
56            crate::adapters::SpawnOutcome::Cancelled => Ok(RunResult {
57                success: false,
58                text: Some("Cancelled.".into()),
59                ..Default::default()
60            }),
61            crate::adapters::SpawnOutcome::Done { exit_code, stderr } => Ok(RunResult {
62                success: exit_code == 0,
63                text: state.result_text,
64                exit_code: Some(exit_code),
65                stats: state.stats,
66                session_id: state.session_id,
67                stderr,
68                cost_usd: None,
69            }),
70        }
71    }
72}
73
74fn build_args(opts: &RunOptions) -> Vec<String> {
75    let mut args = vec![
76        "-p".into(),
77        opts.task.clone(),
78        "--output-format".into(),
79        "stream-json".into(),
80    ];
81
82    if let Some(model) = &opts.model {
83        args.push("--model".into());
84        args.push(model.clone());
85    }
86
87    if let Some(session_id) = &opts.resume_session_id {
88        args.push("--resume".into());
89        args.push(session_id.clone());
90    }
91
92    // Permission bypass for non-interactive use (opt-in)
93    if opts.skip_permissions {
94        args.push("--yolo".into());
95    }
96
97    if let Some(gemini) = opts.providers.as_ref().and_then(|p| p.gemini.as_ref()) {
98        if gemini.sandbox == Some(true) {
99            args.push("-s".into());
100        }
101        if let Some(mode) = &gemini.approval_mode {
102            args.push("--approval-mode".into());
103            args.push(mode.clone());
104        }
105        if let Some(extra) = &gemini.extra_args {
106            args.extend(extra.clone());
107        }
108    }
109
110    args
111}
112
113/// Write temporary config files for MCP servers and system prompts.
114///
115/// Returns the env vars to set and the temp dir handle (must be kept alive
116/// until the child process exits). Only allocates a temp dir when needed.
117async fn write_configs(
118    opts: &RunOptions,
119) -> Result<(HashMap<String, String>, Option<tempfile::TempDir>)> {
120    let has_mcp = opts.mcp_servers.as_ref().is_some_and(|s| !s.is_empty());
121    let needs_prompt_file = opts.system_prompt_file.is_none() && opts.system_prompt.is_some();
122
123    // system_prompt_file doesn't need a temp dir — it points to the file directly.
124    if !has_mcp && !needs_prompt_file {
125        let mut env = HashMap::new();
126        if let Some(path) = &opts.system_prompt_file {
127            env.insert("GEMINI_SYSTEM_MD".into(), path.clone());
128        }
129        return Ok((env, None));
130    }
131
132    let tmp_dir = tempfile::tempdir().map_err(Error::Io)?;
133    let mut env = HashMap::new();
134
135    // MCP servers → .gemini/settings.json
136    if let Some(servers) = &opts.mcp_servers {
137        if !servers.is_empty() {
138            let gemini_dir = tmp_dir.path().join(".gemini");
139            tokio::fs::create_dir_all(&gemini_dir)
140                .await
141                .map_err(Error::Io)?;
142
143            let settings = build_mcp_settings(servers);
144            let settings_path = gemini_dir.join("settings.json");
145            tokio::fs::write(&settings_path, serde_json::to_string_pretty(&settings)?)
146                .await
147                .map_err(Error::Io)?;
148
149            env.insert(
150                "GEMINI_HOME".into(),
151                tmp_dir.path().to_string_lossy().into_owned(),
152            );
153        }
154    }
155
156    // System prompt → file referenced by GEMINI_SYSTEM_MD
157    // system_prompt_file takes precedence (use the file directly).
158    if let Some(path) = &opts.system_prompt_file {
159        env.insert("GEMINI_SYSTEM_MD".into(), path.clone());
160    } else if let Some(prompt) = &opts.system_prompt {
161        let prompt_path = tmp_dir.path().join("system-prompt.md");
162        tokio::fs::write(&prompt_path, prompt)
163            .await
164            .map_err(Error::Io)?;
165        env.insert(
166            "GEMINI_SYSTEM_MD".into(),
167            prompt_path.to_string_lossy().into_owned(),
168        );
169    }
170
171    Ok((env, Some(tmp_dir)))
172}
173
174fn build_mcp_settings(servers: &HashMap<String, McpServer>) -> serde_json::Value {
175    let mut mcp_map = serde_json::Map::new();
176
177    for (name, server) in servers {
178        let mut entry = serde_json::Map::new();
179
180        if let Some(url) = &server.url {
181            entry.insert("url".into(), serde_json::Value::String(url.clone()));
182            let t = match server.transport_type {
183                Some(crate::types::McpTransport::Http) => "http",
184                _ => "sse",
185            };
186            entry.insert("type".into(), serde_json::Value::String(t.into()));
187            if let Some(headers) = &server.headers {
188                entry.insert(
189                    "headers".into(),
190                    serde_json::to_value(headers).unwrap_or_default(),
191                );
192            }
193        } else {
194            if let Some(cmd) = &server.command {
195                entry.insert("command".into(), serde_json::Value::String(cmd.clone()));
196            }
197            if let Some(a) = &server.args {
198                entry.insert("args".into(), serde_json::to_value(a).unwrap_or_default());
199            }
200            if let Some(e) = &server.env {
201                entry.insert("env".into(), serde_json::to_value(e).unwrap_or_default());
202            }
203            if let Some(cwd) = &server.cwd {
204                entry.insert("cwd".into(), serde_json::Value::String(cwd.clone()));
205            }
206        }
207
208        if let Some(include) = &server.include_tools {
209            entry.insert(
210                "includeTools".into(),
211                serde_json::to_value(include).unwrap_or_default(),
212            );
213        }
214        if let Some(exclude) = &server.exclude_tools {
215            entry.insert(
216                "excludeTools".into(),
217                serde_json::to_value(exclude).unwrap_or_default(),
218            );
219        }
220        if let Some(timeout) = server.timeout {
221            entry.insert("timeout".into(), serde_json::Value::Number(timeout.into()));
222        }
223
224        mcp_map.insert(name.clone(), serde_json::Value::Object(entry));
225    }
226
227    let mut root = serde_json::Map::new();
228    root.insert("mcpServers".into(), serde_json::Value::Object(mcp_map));
229    serde_json::Value::Object(root)
230}
231
232#[cfg(test)]
233mod tests {
234    use super::*;
235
236    #[test]
237    fn build_args_minimal() {
238        let opts = RunOptions {
239            task: "hello".into(),
240            ..Default::default()
241        };
242        let args = build_args(&opts);
243        assert_eq!(args, vec!["-p", "hello", "--output-format", "stream-json"]);
244    }
245
246    #[test]
247    fn build_args_skip_permissions() {
248        let opts = RunOptions {
249            task: "hello".into(),
250            skip_permissions: true,
251            ..Default::default()
252        };
253        let args = build_args(&opts);
254        assert!(args.contains(&"--yolo".to_string()));
255    }
256
257    #[test]
258    fn build_args_no_permission_bypass_by_default() {
259        let opts = RunOptions {
260            task: "hello".into(),
261            ..Default::default()
262        };
263        let args = build_args(&opts);
264        assert!(!args.contains(&"--yolo".to_string()));
265    }
266
267    #[test]
268    fn build_args_with_options() {
269        let opts = RunOptions {
270            task: "do something".into(),
271            model: Some("gemini-2.0-flash".into()),
272            resume_session_id: Some("sess-1".into()),
273            providers: Some(crate::types::ProviderOptions {
274                gemini: Some(crate::types::GeminiOptions {
275                    sandbox: Some(true),
276                    approval_mode: Some("auto".into()),
277                    extra_args: Some(vec!["--verbose".into()]),
278                }),
279                ..Default::default()
280            }),
281            ..Default::default()
282        };
283        let args = build_args(&opts);
284        assert!(args.contains(&"-s".to_string()));
285        assert!(args.contains(&"--model".to_string()));
286        assert!(args.contains(&"gemini-2.0-flash".to_string()));
287        assert!(args.contains(&"--resume".to_string()));
288        assert!(args.contains(&"--approval-mode".to_string()));
289        assert!(args.contains(&"--verbose".to_string()));
290    }
291}
cli_agents/adapters/gemini/mod.rs

cli_agents/adapters/gemini/
mod.rs
