Initial commit: breadcrumbs — profile-driven Wi-Fi + Tailscale state machine

src/state.rs

@@ -0,0 +1,34 @@
+use std::fs;
+
+use serde::{Deserialize, Serialize};
+
+use crate::config::{state_dir, state_path};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct State {
+    pub profile: String,
+    #[serde(default)]
+    pub updated: String,
+}
+
+impl State {
+    pub fn load(default_profile: &str) -> State {
+        if let Ok(text) = fs::read_to_string(state_path()) {
+            if let Ok(s) = toml::from_str::<State>(&text) {
+                if !s.profile.is_empty() {
+                    return s;
+                }
+            }
+        }
+        State {
+            profile: default_profile.to_string(),
+            updated: String::new(),
+        }
+    }
+
+    pub fn save(&self) -> Result<(), String> {
+        fs::create_dir_all(state_dir()).map_err(|e| format!("creating state dir: {e}"))?;
+        let text = toml::to_string_pretty(self).map_err(|e| format!("serializing state: {e}"))?;
+        fs::write(state_path(), text).map_err(|e| format!("writing state: {e}"))
+    }
+}