Error handling to keep unibar from dying

* Handled the case where network goes down and Curl errors out fetching
  weather data

src/bar_modules/bar_module_weather.rs

@@ -25,9 +25,17 @@ impl UnibarModuleWeather {
 
     // --------------------
     fn get_current_temperature(&self) -> f32 {
-        let deg_c :f32 = self.weather_info["features"][0]["properties"]["temperature"]["value"]
+        let deg_c :f32;
-                                    .to_string().parse().unwrap();
 
+        match self.weather_info {
+            serde_json::Value::Null => {
+                deg_c = 0.0;
+            }
+            _ => {
+                deg_c = self.weather_info["features"][0]["properties"]["temperature"]["value"]
+                            .to_string().parse().unwrap();
+            }
+        }
         match self.opts.weather_units {
             common::TemperatureUnits::Metric => return deg_c,
             common::TemperatureUnits::Imperial => return (deg_c * 9.0 / 5.0) + 32.0,
@@ -161,30 +169,41 @@ impl bar_modules::BarModuleActions for UnibarModuleWeather {
         let mut curl        = Easy::new();
         let mut url_string  = Vec::new();
         let mut curl_ret    = Vec::new();
+        let mut curl_err    = false;
 
         url_string.push("https://api.weather.gov/stations/".to_owned());
         url_string.push(self.opts.weather_station.to_owned());
         url_string.push("/observations?limit=1".to_owned());
 
         curl.url(url_string.concat().as_str()).unwrap();
-        {
-            let mut list = List::new();
-            list.append("User-Agent: Bar Weather (mahesh@heshapps.com)").unwrap();
-            curl.http_headers(list).unwrap();
 
+        let mut list = List::new();
+        list.append("User-Agent: Bar Weather (mahesh@heshapps.com)").unwrap();
+        curl.http_headers(list).unwrap();
+
+        // Scoped block to handle the data transfer (Credit: Gemini)
+        {
             let mut transfer = curl.transfer();
 
+            // Configure callback to write received response
             transfer.write_function(|data| {
                 curl_ret.extend_from_slice(data);
                 Ok(data.len())
             }).unwrap();
-            transfer.perform().unwrap();
-        }
-        if self.opts.debug {
-            println!("-----> curl_data - [{}]", std::str::from_utf8(&curl_ret).unwrap());
-        }
 
-        self.weather_info = serde_json::from_str(str::from_utf8(&curl_ret).unwrap()).unwrap();
+            // Perform the request once configured
+            if let Err(e) = transfer.perform() {
+                eprintln!("Curl error: {e}");
+                curl_err = true;
+            }
+        }  // transfer goes out of scope and cleans up here
+
+        if !curl_err {
+            let curl_reg_str = String::from_utf8(curl_ret).unwrap_or_else(|_| {
+                "".to_string()
+            });
+            self.weather_info = serde_json::from_str(curl_reg_str.as_str()).unwrap();
+        }
     }
 
     // --------------------
@@ -198,12 +217,20 @@ impl bar_modules::BarModuleActions for UnibarModuleWeather {
 
     // --------------------
     fn get_icon(&self) -> String {
-        // "icon": "https://api.weather.gov/icons/land/night/ovc?size=medium",
-        let re = Regex::new(r"(\w+)\?size").unwrap();
-        let json_val = self.weather_info["features"][0]["properties"]["icon"].to_string();
-        let caps = re.captures(&json_val).unwrap();
 
-        return self.get_unicode_symbol(caps.get(1).unwrap().as_str());
+        match self.weather_info {
+            serde_json::Value::Null => {
+                return "⁈".to_string();
+            }
+            _ => {
+                // "icon": "https://api.weather.gov/icons/land/night/ovc?size=medium",
+                let re = Regex::new(r"(\w+)\?size").unwrap();
+                let json_val = self.weather_info["features"][0]["properties"]["icon"].to_string();
+                let caps = re.captures(&json_val).unwrap();
+
+                return self.get_unicode_symbol(caps.get(1).unwrap().as_str());
+            }
+        }
     }
 }