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, cwd_override, _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        // Use cwd override (temp dir with workspace MCP config) if set,
40        // otherwise use the user-specified cwd.
41        let effective_cwd = cwd_override
42            .as_deref()
43            .or(opts.cwd.as_deref())
44            .unwrap_or(".");
45
46        let mut state = parse::ParseState::default();
47
48        let outcome = crate::adapters::spawn_and_stream(
49            crate::adapters::SpawnParams {
50                cli_label: "gemini",
51                binary: &binary,
52                args: &cli_args,
53                extra_env: &extra_env,
54                cwd: effective_cwd,
55                max_bytes,
56                cancel: &cancel,
57            },
58            |line| parse::parse_line(line, &mut state, emit),
59        )
60        .await?;
61
62        match outcome {
63            crate::adapters::SpawnOutcome::Cancelled => Ok(RunResult {
64                success: false,
65                text: Some("Cancelled.".into()),
66                ..Default::default()
67            }),
68            crate::adapters::SpawnOutcome::Done { exit_code, stderr } => Ok(RunResult {
69                success: exit_code == 0,
70                text: state.result_text,
71                exit_code: Some(exit_code),
72                stats: state.stats,
73                session_id: state.session_id,
74                stderr,
75                cost_usd: None,
76            }),
77        }
78    }
79}
80
81fn build_args(opts: &RunOptions) -> Vec<String> {
82    let mut args = vec![
83        "-p".into(),
84        opts.task.clone(),
85        "--output-format".into(),
86        "stream-json".into(),
87    ];
88
89    if let Some(model) = &opts.model {
90        args.push("--model".into());
91        args.push(model.clone());
92    }
93
94    // Gemini's --resume takes "latest" or an index, not a UUID session ID.
95    // Use "latest" to resume the most recent session in the cwd.
96    if opts.resume_session_id.is_some() {
97        args.push("--resume".into());
98        args.push("latest".into());
99    }
100
101    // Permission bypass for non-interactive use (opt-in)
102    if opts.skip_permissions {
103        args.push("--yolo".into());
104    }
105
106    if let Some(gemini) = opts.providers.as_ref().and_then(|p| p.gemini.as_ref()) {
107        if gemini.sandbox == Some(true) {
108            args.push("-s".into());
109        }
110        // Skip --approval-mode when --yolo is already set (they conflict in Gemini CLI).
111        if !opts.skip_permissions {
112            if let Some(mode) = &gemini.approval_mode {
113                args.push("--approval-mode".into());
114                args.push(mode.clone());
115            }
116        }
117        if let Some(extra) = &gemini.extra_args {
118            args.extend(extra.clone());
119        }
120    }
121
122    args
123}
124
125/// Write temporary config files for MCP servers and system prompts.
126///
127/// Returns env vars, an optional cwd override, and the temp dir handle
128/// (must be kept alive until the child process exits).
129async fn write_configs(
130    opts: &RunOptions,
131) -> Result<(HashMap<String, String>, Option<String>, Option<tempfile::TempDir>)> {
132    let has_mcp = opts.mcp_servers.as_ref().is_some_and(|s| !s.is_empty());
133    let needs_prompt_file = opts.system_prompt_file.is_none() && opts.system_prompt.is_some();
134
135    // system_prompt_file doesn't need a temp dir — it points to the file directly.
136    if !has_mcp && !needs_prompt_file {
137        let mut env = HashMap::new();
138        if let Some(path) = &opts.system_prompt_file {
139            env.insert("GEMINI_SYSTEM_MD".into(), path.clone());
140        }
141        return Ok((env, None, None));
142    }
143
144    let tmp_dir = tempfile::tempdir().map_err(Error::Io)?;
145    let mut env = HashMap::new();
146
147    // MCP servers → workspace-level .gemini/settings.json.
148    // Gemini CLI merges workspace config (from cwd) with user config (~/.gemini/),
149    // preserving auth credentials while adding our MCP servers.
150    //
151    // If opts.cwd is set, write config there (persistent, enables session resume).
152    // Otherwise, use the temp dir (ephemeral, no session resume).
153    let cwd_override = if let Some(servers) = &opts.mcp_servers {
154        if !servers.is_empty() {
155            let config_dir = if let Some(cwd) = &opts.cwd {
156                std::path::PathBuf::from(cwd)
157            } else {
158                tmp_dir.path().to_path_buf()
159            };
160
161            let gemini_dir = config_dir.join(".gemini");
162            tokio::fs::create_dir_all(&gemini_dir)
163                .await
164                .map_err(Error::Io)?;
165
166            let settings = build_mcp_settings(servers);
167            let settings_path = gemini_dir.join("settings.json");
168            tokio::fs::write(&settings_path, serde_json::to_string_pretty(&settings)?)
169                .await
170                .map_err(Error::Io)?;
171
172            // If we wrote to opts.cwd, no override needed — the adapter
173            // already uses opts.cwd. If we wrote to temp dir, override cwd.
174            if opts.cwd.is_none() {
175                Some(tmp_dir.path().to_string_lossy().into_owned())
176            } else {
177                None
178            }
179        } else {
180            None
181        }
182    } else {
183        None
184    };
185
186    // System prompt → file referenced by GEMINI_SYSTEM_MD
187    // system_prompt_file takes precedence (use the file directly).
188    if let Some(path) = &opts.system_prompt_file {
189        env.insert("GEMINI_SYSTEM_MD".into(), path.clone());
190    } else if let Some(prompt) = &opts.system_prompt {
191        let prompt_path = tmp_dir.path().join("system-prompt.md");
192        tokio::fs::write(&prompt_path, prompt)
193            .await
194            .map_err(Error::Io)?;
195        env.insert(
196            "GEMINI_SYSTEM_MD".into(),
197            prompt_path.to_string_lossy().into_owned(),
198        );
199    }
200
201    Ok((env, cwd_override, Some(tmp_dir)))
202}
203
204fn build_mcp_settings(servers: &HashMap<String, McpServer>) -> serde_json::Value {
205    let mut mcp_map = serde_json::Map::new();
206
207    for (name, server) in servers {
208        let mut entry = serde_json::Map::new();
209
210        if let Some(url) = &server.url {
211            entry.insert("url".into(), serde_json::Value::String(url.clone()));
212            let t = match server.transport_type {
213                Some(crate::types::McpTransport::Http) => "http",
214                _ => "sse",
215            };
216            entry.insert("type".into(), serde_json::Value::String(t.into()));
217            if let Some(headers) = &server.headers {
218                entry.insert(
219                    "headers".into(),
220                    serde_json::to_value(headers).unwrap_or_default(),
221                );
222            }
223        } else {
224            if let Some(cmd) = &server.command {
225                entry.insert("command".into(), serde_json::Value::String(cmd.clone()));
226            }
227            if let Some(a) = &server.args {
228                entry.insert("args".into(), serde_json::to_value(a).unwrap_or_default());
229            }
230            if let Some(e) = &server.env {
231                entry.insert("env".into(), serde_json::to_value(e).unwrap_or_default());
232            }
233            if let Some(cwd) = &server.cwd {
234                entry.insert("cwd".into(), serde_json::Value::String(cwd.clone()));
235            }
236        }
237
238        if let Some(include) = &server.include_tools {
239            entry.insert(
240                "includeTools".into(),
241                serde_json::to_value(include).unwrap_or_default(),
242            );
243        }
244        if let Some(exclude) = &server.exclude_tools {
245            entry.insert(
246                "excludeTools".into(),
247                serde_json::to_value(exclude).unwrap_or_default(),
248            );
249        }
250        if let Some(timeout) = server.timeout {
251            entry.insert("timeout".into(), serde_json::Value::Number(timeout.into()));
252        }
253
254        mcp_map.insert(name.clone(), serde_json::Value::Object(entry));
255    }
256
257    let mut root = serde_json::Map::new();
258    root.insert("mcpServers".into(), serde_json::Value::Object(mcp_map));
259    serde_json::Value::Object(root)
260}
261
262#[cfg(test)]
263mod tests {
264    use super::*;
265
266    #[test]
267    fn build_args_minimal() {
268        let opts = RunOptions {
269            task: "hello".into(),
270            ..Default::default()
271        };
272        let args = build_args(&opts);
273        assert_eq!(args, vec!["-p", "hello", "--output-format", "stream-json"]);
274    }
275
276    #[test]
277    fn build_args_skip_permissions() {
278        let opts = RunOptions {
279            task: "hello".into(),
280            skip_permissions: true,
281            ..Default::default()
282        };
283        let args = build_args(&opts);
284        assert!(args.contains(&"--yolo".to_string()));
285    }
286
287    #[test]
288    fn build_args_no_permission_bypass_by_default() {
289        let opts = RunOptions {
290            task: "hello".into(),
291            ..Default::default()
292        };
293        let args = build_args(&opts);
294        assert!(!args.contains(&"--yolo".to_string()));
295    }
296
297    #[test]
298    fn build_args_with_options() {
299        let opts = RunOptions {
300            task: "do something".into(),
301            model: Some("gemini-2.0-flash".into()),
302            resume_session_id: Some("sess-1".into()),
303            providers: Some(crate::types::ProviderOptions {
304                gemini: Some(crate::types::GeminiOptions {
305                    sandbox: Some(true),
306                    approval_mode: Some("auto".into()),
307                    extra_args: Some(vec!["--verbose".into()]),
308                }),
309                ..Default::default()
310            }),
311            ..Default::default()
312        };
313        let args = build_args(&opts);
314        assert!(args.contains(&"-s".to_string()));
315        assert!(args.contains(&"--model".to_string()));
316        assert!(args.contains(&"gemini-2.0-flash".to_string()));
317        assert!(args.contains(&"--resume".to_string()));
318        assert!(args.contains(&"--approval-mode".to_string()));
319        assert!(args.contains(&"--verbose".to_string()));
320    }
321}
cli_agents/adapters/gemini/mod.rs

cli_agents/adapters/gemini/
mod.rs
