Clear data before new bar display iteration

This makes sure that data displayed is always fresh

src/bar_modules/bar_module_cpu.rs

@@ -116,6 +116,12 @@ impl UnibarModuleCpu {
 
 impl bar_modules::BarModuleActions for UnibarModuleCpu {
 
+    // --------------------
+    fn clear(&mut self) {
+        self.cpu_times_sample_1 = CpuTimes::new();
+        self.cpu_times_sample_2 = CpuTimes::new();
+    }
+
     // --------------------
     fn generate_data(&mut self) {
         self.cpu_times_sample_1 = self.read_cpu_times().expect("Trouble getting CPU times sample 1");

src/bar_modules/bar_module_date.rs

@@ -21,8 +21,12 @@ impl UnibarModuleDate {
 impl bar_modules::BarModuleActions for UnibarModuleDate {
 
     // --------------------
-    fn generate_data(&mut self) {
+    fn clear(&mut self) {
         self.date_time = Local::now();
+    }
+
+    // --------------------
+    fn generate_data(&mut self) {
         if self.opts.debug {
             println!("-----> Date dump {:#?}", self.date_time);
         }

src/bar_modules/bar_module_memory.rs

@@ -25,6 +25,11 @@ impl UnibarModuleMemory {
 
 impl bar_modules::BarModuleActions for UnibarModuleMemory {
 
+    // --------------------
+    fn clear(&mut self) {
+        self.meminfo_str = "".to_string();
+    }
+
     // --------------------
     fn generate_data(&mut self) {
         let path = Path::new("/proc/meminfo");
@@ -42,7 +47,6 @@ impl bar_modules::BarModuleActions for UnibarModuleMemory {
             },
         };
         self.meminfo_str.pop();
-
     }
 
     // --------------------

src/bar_modules/bar_module_music.rs

@@ -5,26 +5,33 @@ use crate::bar_modules;
 
 #[derive(Clone)]
 pub struct UnibarModuleMusic {
-    opts: common::AppOptions,
-    current_stdout :String,
-    progress_stdout :String,
-    state_stdout: String,
+    opts:               common::AppOptions,
+    current_stdout:     String,
+    progress_stdout:    String,
+    state_stdout:       String,
 }
 
 impl UnibarModuleMusic {
     // --------------------
     pub fn new(o :common::AppOptions) -> Self {
         UnibarModuleMusic {
-            opts: o,
-            current_stdout: "".to_string(),
-            progress_stdout: "".to_string(),
-            state_stdout: "stopped".to_string(),
+            opts:               o,
+            current_stdout:     "".to_string(),
+            progress_stdout:    "".to_string(),
+            state_stdout:       "stopped".to_string(),
         }
     }
 }
 
 impl bar_modules::BarModuleActions for UnibarModuleMusic {
 
+    // --------------------
+    fn clear(&mut self) {
+        self.current_stdout     = "".to_string();
+        self.progress_stdout    = "".to_string();
+        self.state_stdout       = "stopped".to_string();
+    }
+
     // --------------------
     fn generate_data(&mut self) {
         // MPD format options here:

src/bar_modules/bar_module_network.rs

@@ -26,43 +26,54 @@ impl UnibarModuleNetwork {
 
 impl bar_modules::BarModuleActions for UnibarModuleNetwork {
 
+    // --------------------
+    fn clear(&mut self) {
+        self.network_info = json!(serde_json::Value::Null);
+    }
+
     // --------------------
     fn generate_data(&mut self) {
         // Output of 'ip -j address' command has network information
-        let ip_addr_output = Command::new("ip")
-                            .arg("-j") // Output in json format
-                            .arg("address")
-                            .stdout(Stdio::piped())
-                            .output()
-                            .unwrap();
-        self.ip_addr_stdout = String::from_utf8(ip_addr_output.stdout).unwrap();
-        self.ip_addr_stdout.pop();
-
-        let network_data: Value = serde_json::from_str::<Value>(self.ip_addr_stdout.as_str()).unwrap();
-
-        if let Some(interfaces) = network_data.as_array() {
-            if self.opts.debug {
-                println!("-----> network_data - {:#?}", network_data);
+        match Command::new("ip")
+                      .arg("-j") // Output in json format
+                      .arg("address")
+                      .stdout(Stdio::piped())
+                      .output() {
+            Err(e) => {
+                eprintln!("Error getting network information {e}");
+                self.network_info = json!(serde_json::Value::Null);
             }
-            // Get all interfaces that are up
-            let mut up_intf :Vec<_> = interfaces.iter()
-                                    .filter(|el| el["operstate"].as_str().unwrap().contains("UP"))
-                                    .cloned().collect();
+            Ok(ip_addr_output) => {
+                self.ip_addr_stdout = String::from_utf8(ip_addr_output.stdout).unwrap();
+                self.ip_addr_stdout.pop();
 
-            // Sort by 'ifname'. This is an unreliable way to proiritize ethernet over wifi.
-            // Ethenet network interface names normally start with 'e' and wifi interface names
-            // start with 'w'
-            up_intf.sort_by(|a, b| a["ifname"].as_str().unwrap().cmp(b["ifname"].as_str().unwrap()));
-            if up_intf.len() > 0 {
-                let inet_addr :Vec<_> = up_intf[0]["addr_info"].as_array().unwrap().iter()
-                                        .filter(|ai| ai["scope"].as_str().unwrap().contains("global"))
-                                        .cloned().collect();
-                if inet_addr.len() > 0 {
+                let network_data: Value = serde_json::from_str::<Value>(self.ip_addr_stdout.as_str()).unwrap();
+
+                if let Some(interfaces) = network_data.as_array() {
                     if self.opts.debug {
-                        println!("-----> Inet Addr - {:#?}", inet_addr);
+                        println!("-----> network_data - {:#?}", network_data);
+                    }
+                    // Get all interfaces that are up
+                    let mut up_intf :Vec<_> = interfaces.iter()
+                                            .filter(|el| el["operstate"].as_str().unwrap().contains("UP"))
+                                            .cloned().collect();
+
+                    // Sort by 'ifname'. This is an unreliable way to proiritize ethernet over wifi.
+                    // Ethenet network interface names normally start with 'e' and wifi interface names
+                    // start with 'w'
+                    up_intf.sort_by(|a, b| a["ifname"].as_str().unwrap().cmp(b["ifname"].as_str().unwrap()));
+                    if up_intf.len() > 0 {
+                        let inet_addr :Vec<_> = up_intf[0]["addr_info"].as_array().unwrap().iter()
+                                                .filter(|ai| ai["scope"].as_str().unwrap().contains("global"))
+                                                .cloned().collect();
+                        if inet_addr.len() > 0 {
+                            if self.opts.debug {
+                                println!("-----> Inet Addr - {:#?}", inet_addr);
+                            }
+                            self.network_info = inet_addr[0].clone();
+                            self.network_info["ifname"] = up_intf[0]["ifname"].clone();
+                        }
                     }
-                    self.network_info = inet_addr[0].clone();
-                    self.network_info["ifname"] = up_intf[0]["ifname"].clone();
                 }
             }
         }

src/bar_modules/bar_module_power.rs

@@ -38,6 +38,11 @@ impl UnibarModulePower {
 
 impl bar_modules::BarModuleActions for UnibarModulePower {
 
+    // --------------------
+    fn clear(&mut self) {
+        self.power_info = PowerData::new();
+    }
+
     // --------------------
     fn generate_data(&mut self) {
         // Following command is used to get power data:

src/bar_modules/bar_module_time.rs

@@ -21,8 +21,12 @@ impl UnibarModuleTime {
 impl bar_modules::BarModuleActions for UnibarModuleTime {
 
     // --------------------
-    fn generate_data(&mut self) {
+    fn clear(&mut self) {
         self.date_time = Local::now();
+    }
+
+    // --------------------
+    fn generate_data(&mut self) {
         if self.opts.debug {
             println!("-----> Time dump {:#?}", self.date_time);
         }

src/bar_modules/bar_module_weather.rs

@@ -150,6 +150,11 @@ impl UnibarModuleWeather {
 
 impl bar_modules::BarModuleActions for UnibarModuleWeather {
 
+    // --------------------
+    fn clear(&mut self) {
+        self.weather_info = json!(serde_json::Value::Null);
+    }
+
     // --------------------
     fn generate_data(&mut self) {
         // Print a web page onto stdout

src/bar_modules/mod.rs

@@ -1,6 +1,9 @@
 // --------------------
 /// All Bar modules must implement the actions
 pub trait BarModuleActions {
+    /// Do necessary clean up before starting new fetch
+    fn clear(&mut self);
+
     /// Do necessary processing to generate data for this bar module
     fn generate_data(&mut self);
 

src/main.rs

@@ -86,13 +86,15 @@ impl Unibar {
         for md in &mut self.bar_modules_enabled {
             let mut mod_parts = Vec::new();
 
-            // Each bar module implements following 3 steps:
+            // Each bar module implements following 4 steps:
+            //   * Clear data from previous iteration
             //   * Generate raw data with pertinent information
             //   * Return a unicode icon to be displayed
             //   * Return a String content to be displayed after the icon
             //
             // Following generates ICON+CONTENT string for a module to be displayed
             // in the bar
+            md.clear();
             md.generate_data();
             mod_parts.push(md.get_icon());
             mod_parts.push(md.get_content());