feat(daemon): [resume] config map + snapshot_interval_secs with built-in defaults

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/spaceshd/src/config.rs

@@ -22,6 +22,20 @@ pub struct AppearanceConfig {
     pub accent: Option<String>,
 }
 
+/// Built-in resume args for known agents, used when config has no override.
+/// (command basename, resume args)
+const DEFAULT_RESUME: &[(&str, &[&str])] = &[
+    ("claude", &["--continue"]),
+    ("codex", &["resume"]),
+];
+
+#[derive(Debug, Clone, Default, Deserialize, Serialize)]
+pub struct ResumeConfig {
+    /// command basename -> args that continue its previous session.
+    #[serde(default)]
+    pub commands: std::collections::HashMap<String, Vec<String>>,
+}
+
 #[derive(Debug, Clone, Default, Deserialize, Serialize)]
 pub struct Config {
     /// Shell launched for plain (no-command) panels. When unset, the daemon
@@ -32,6 +46,11 @@ pub struct Config {
     pub terminal: TerminalConfig,
     #[serde(default)]
     pub appearance: AppearanceConfig,
+    #[serde(default)]
+    pub resume: ResumeConfig,
+    /// How often (seconds) the daemon dumps changed grids to disk.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub snapshot_interval_secs: Option<u64>,
 }
 
 impl Config {
@@ -85,6 +104,25 @@ impl Config {
             .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))?;
         std::fs::write(path, s)
     }
+
+    /// Resume args for a command, by basename: user map → built-in default → None.
+    pub fn resume_args(&self, command: &str) -> Option<Vec<String>> {
+        let base = std::path::Path::new(command)
+            .file_name()
+            .map(|s| s.to_string_lossy().to_string())
+            .unwrap_or_else(|| command.to_string());
+        if let Some(args) = self.resume.commands.get(&base) {
+            return Some(args.clone());
+        }
+        DEFAULT_RESUME.iter()
+            .find(|(name, _)| *name == base)
+            .map(|(_, args)| args.iter().map(|s| s.to_string()).collect())
+    }
+
+    /// Snapshot dump cadence in seconds (config → default 5, clamped to [1, 3600]).
+    pub fn snapshot_interval_secs(&self) -> u64 {
+        self.snapshot_interval_secs.unwrap_or(5).clamp(1, 3600)
+    }
 }
 
 /// Resolve the shell to spawn for a plain panel.
@@ -298,4 +336,38 @@ mod tests {
         assert_eq!(back.appearance.accent.as_deref(), Some("purple"));
         let _ = std::fs::remove_file(&path);
     }
+
+    #[test]
+    fn resume_args_user_then_default_then_none() {
+        let mut c = Config::default();
+        // built-in defaults present without any config
+        assert_eq!(c.resume_args("claude").as_deref(), Some(&["--continue".to_string()][..]));
+        assert_eq!(c.resume_args("codex").as_deref(), Some(&["resume".to_string()][..]));
+        // a path is reduced to its basename before lookup
+        assert_eq!(c.resume_args("/usr/local/bin/claude").as_deref(), Some(&["--continue".to_string()][..]));
+        // unknown command → None
+        assert_eq!(c.resume_args("bash"), None);
+        // user override wins over the default
+        c.resume.commands.insert("claude".into(), vec!["--resume".into(), "last".into()]);
+        assert_eq!(c.resume_args("claude"), Some(vec!["--resume".into(), "last".into()]));
+    }
+
+    #[test]
+    fn snapshot_interval_defaults_to_5s() {
+        let c = Config::default();
+        assert_eq!(c.snapshot_interval_secs(), 5);
+    }
+
+    #[test]
+    fn parses_resume_table_and_interval() {
+        let dir = std::env::temp_dir().join(format!("spacesh-cfg-resume-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("config.toml");
+        std::fs::write(&path,
+            "snapshot_interval_secs = 10\n[resume.commands]\ngemini = [\"--resume\"]\n").unwrap();
+        let c = Config::from_path(&path);
+        assert_eq!(c.snapshot_interval_secs(), 10);
+        assert_eq!(c.resume_args("gemini"), Some(vec!["--resume".into()]));
+        let _ = std::fs::remove_file(&path);
+    }
 }