use std::io::Write;
use std::path::Path;
use serde_json::json;
use crate::errors::{Result, TokenSaveError};
use super::{
backup_config_file, load_json_file, load_json_file_strict, safe_write_json_file,
AgentIntegration, DoctorCounters, HealthcheckContext, InstallContext,
};
pub struct GeminiIntegration;
impl AgentIntegration for GeminiIntegration {
fn name(&self) -> &'static str {
"Gemini CLI"
}
fn id(&self) -> &'static str {
"gemini"
}
fn install(&self, ctx: &InstallContext) -> Result<()> {
let gemini_dir = ctx.home.join(".gemini");
std::fs::create_dir_all(&gemini_dir).ok();
let settings_path = gemini_dir.join("settings.json");
install_mcp_server(&settings_path, &ctx.tokensave_bin)?;
let gemini_md = gemini_dir.join("GEMINI.md");
install_prompt_rules(&gemini_md)?;
eprintln!();
eprintln!("Setup complete. Next steps:");
eprintln!(" 1. cd into your project and run: tokensave init");
eprintln!(" 2. Start a new Gemini CLI session — tokensave tools are now available");
Ok(())
}
fn uninstall(&self, ctx: &InstallContext) -> Result<()> {
let gemini_dir = ctx.home.join(".gemini");
let settings_path = gemini_dir.join("settings.json");
uninstall_mcp_server(&settings_path);
let gemini_md = gemini_dir.join("GEMINI.md");
uninstall_prompt_rules(&gemini_md);
eprintln!();
eprintln!("Uninstall complete. Tokensave has been removed from Gemini CLI.");
eprintln!("Start a new Gemini CLI session for changes to take effect.");
Ok(())
}
fn healthcheck(&self, dc: &mut DoctorCounters, ctx: &HealthcheckContext) {
eprintln!("\n\x1b[1mGemini CLI integration\x1b[0m");
doctor_check_settings(dc, &ctx.home);
doctor_check_prompt(dc, &ctx.home);
}
fn is_detected(&self, home: &Path) -> bool {
home.join(".gemini").is_dir()
}
fn has_tokensave(&self, home: &Path) -> bool {
let settings = home.join(".gemini").join("settings.json");
if !settings.exists() {
return false;
}
let json = super::load_json_file(&settings);
json.get("mcpServers")
.and_then(|v| v.get("tokensave"))
.is_some()
}
}
fn install_mcp_server(settings_path: &Path, tokensave_bin: &str) -> Result<()> {
let backup = backup_config_file(settings_path)?;
let mut settings = match load_json_file_strict(settings_path) {
Ok(v) => v,
Err(e) => {
if let Some(ref b) = backup {
eprintln!(" Backup preserved at: {}", b.display());
}
return Err(e);
}
};
settings["mcpServers"]["tokensave"] = json!({
"command": tokensave_bin,
"args": ["serve"],
"trust": true
});
safe_write_json_file(settings_path, &settings, backup.as_deref())?;
eprintln!(
"\x1b[32m✔\x1b[0m Added tokensave MCP server to {}",
settings_path.display()
);
Ok(())
}
fn install_prompt_rules(gemini_md: &Path) -> Result<()> {
let marker = "## Prefer tokensave MCP tools";
let existing = if gemini_md.exists() {
std::fs::read_to_string(gemini_md).unwrap_or_default()
} else {
String::new()
};
if existing.contains(marker) {
eprintln!(" GEMINI.md already contains tokensave rules, skipping");
return Ok(());
}
let mut f = std::fs::OpenOptions::new()
.create(true)
.append(true)
.open(gemini_md)
.map_err(|e| TokenSaveError::Config {
message: format!("failed to open GEMINI.md: {e}"),
})?;
write!(
f,
"\n{marker}\n\n\
Before reading source files or scanning the codebase, use the tokensave MCP tools \
(`tokensave_context`, `tokensave_search`, `tokensave_callers`, `tokensave_callees`, \
`tokensave_impact`, `tokensave_node`, `tokensave_files`, `tokensave_affected`). \
They provide instant semantic results from a pre-built knowledge graph and are \
faster than file reads.\n\n\
If a code analysis question cannot be fully answered by tokensave MCP tools, \
try querying the SQLite database directly at `.tokensave/tokensave.db` \
(tables: `nodes`, `edges`, `files`). Use SQL to answer complex structural queries \
that go beyond what the built-in tools expose.\n\n\
If you discover a gap where an extractor, schema, or tokensave tool could be \
improved to answer a question natively, propose to the user that they open an issue \
at https://github.com/aovestdipaperino/tokensave describing the limitation. \
**Remind the user to strip any sensitive or proprietary code from the bug description \
before submitting.**\n"
)
.ok();
eprintln!(
"\x1b[32m✔\x1b[0m Appended tokensave rules to {}",
gemini_md.display()
);
Ok(())
}
fn uninstall_mcp_server(settings_path: &Path) {
if !settings_path.exists() {
return;
}
let Ok(contents) = std::fs::read_to_string(settings_path) else {
return;
};
let Ok(mut settings) = serde_json::from_str::<serde_json::Value>(&contents) else {
return;
};
let Some(servers) = settings
.get_mut("mcpServers")
.and_then(|v| v.as_object_mut())
else {
return;
};
if servers.remove("tokensave").is_none() {
eprintln!(
" No tokensave MCP server in {}, skipping",
settings_path.display()
);
return;
}
if servers.is_empty() {
settings.as_object_mut().map(|o| o.remove("mcpServers"));
}
let is_empty = settings.as_object().is_some_and(|o| o.is_empty());
if is_empty {
std::fs::remove_file(settings_path).ok();
eprintln!(
"\x1b[32m✔\x1b[0m Removed {} (was empty)",
settings_path.display()
);
} else {
let pretty = serde_json::to_string_pretty(&settings).unwrap_or_default();
std::fs::write(settings_path, format!("{pretty}\n")).ok();
eprintln!(
"\x1b[32m✔\x1b[0m Removed tokensave MCP server from {}",
settings_path.display()
);
}
}
fn uninstall_prompt_rules(gemini_md: &Path) {
if !gemini_md.exists() {
return;
}
let Ok(contents) = std::fs::read_to_string(gemini_md) else {
return;
};
if !contents.contains("tokensave") {
eprintln!(" GEMINI.md does not contain tokensave rules, skipping");
return;
}
let marker = "## Prefer tokensave MCP tools";
let Some(start) = contents.find(marker) else {
return;
};
let after_marker = start + marker.len();
let end = contents[after_marker..]
.find("\n## ")
.map(|pos| after_marker + pos)
.unwrap_or(contents.len());
let mut new_contents = String::new();
new_contents.push_str(contents[..start].trim_end());
let remainder = &contents[end..];
if !remainder.is_empty() {
new_contents.push_str("\n\n");
new_contents.push_str(remainder.trim_start());
}
let new_contents = new_contents.trim().to_string();
if new_contents.is_empty() {
std::fs::remove_file(gemini_md).ok();
eprintln!(
"\x1b[32m✔\x1b[0m Removed {} (was empty)",
gemini_md.display()
);
} else {
std::fs::write(gemini_md, format!("{new_contents}\n")).ok();
eprintln!(
"\x1b[32m✔\x1b[0m Removed tokensave rules from {}",
gemini_md.display()
);
}
}
fn doctor_check_settings(dc: &mut DoctorCounters, home: &Path) {
let settings_path = home.join(".gemini").join("settings.json");
if !settings_path.exists() {
dc.warn(&format!(
"{} not found — run `tokensave install --agent gemini` if you use Gemini CLI",
settings_path.display()
));
return;
}
let settings = load_json_file(&settings_path);
let server = settings.get("mcpServers").and_then(|v| v.get("tokensave"));
let Some(server) = server.and_then(|v| v.as_object()) else {
dc.fail(&format!(
"MCP server NOT registered in {} — run `tokensave install --agent gemini`",
settings_path.display()
));
return;
};
dc.pass(&format!(
"MCP server registered in {}",
settings_path.display()
));
let has_serve = server
.get("args")
.and_then(|v| v.as_array())
.is_some_and(|arr| arr.iter().any(|v| v.as_str() == Some("serve")));
if has_serve {
dc.pass("MCP server args include \"serve\"");
} else {
dc.fail("MCP server args missing \"serve\" — run `tokensave install --agent gemini`");
}
let is_trusted = server
.get("trust")
.and_then(|v| v.as_bool())
.unwrap_or(false);
if is_trusted {
dc.pass("MCP server has trust: true (tools auto-approved)");
} else {
dc.warn("MCP server missing trust: true — Gemini will prompt for each tool call");
}
}
fn doctor_check_prompt(dc: &mut DoctorCounters, home: &Path) {
let gemini_md = home.join(".gemini").join("GEMINI.md");
if gemini_md.exists() {
let has_rules = std::fs::read_to_string(&gemini_md)
.unwrap_or_default()
.contains("tokensave");
if has_rules {
dc.pass("GEMINI.md contains tokensave rules");
} else {
dc.fail("GEMINI.md missing tokensave rules — run `tokensave install --agent gemini`");
}
} else {
dc.warn("~/.gemini/GEMINI.md does not exist");
}
}