other: remove some unnecessary vec allocations (#1234)

* other: remove unnecessary vector allocations in farmer

* other: remove unnecessary vector allocations when drawing tui Rows

3 files changed, 14 insertions, 17 deletions

diff --git a/src/app/data_farmer.rs b/src/app/data_farmer.rs
index d1db6070..37e58229 100644
--- a/src/app/data_farmer.rs
+++ b/src/app/data_farmer.rs
@@ -318,7 +318,7 @@ impl DataCollection {
         cpu.iter()
             .for_each(|cpu| new_entry.cpu_data.push(cpu.cpu_usage));
 
-        self.cpu_harvest = cpu.to_vec();
+        self.cpu_harvest = cpu;
     }
 
     fn eat_load_avg(&mut self, load_avg: cpu::LoadAvgHarvest, new_entry: &mut TimedData) {
@@ -328,14 +328,12 @@ impl DataCollection {
     }
 
     fn eat_temp(&mut self, temperature_sensors: Vec<temperature::TempHarvest>) {
-        // TODO: [PO] To implement
-        self.temp_harvest = temperature_sensors.to_vec();
+        self.temp_harvest = temperature_sensors;
     }
 
     fn eat_disks(
         &mut self, disks: Vec<disks::DiskHarvest>, io: disks::IoHarvest, harvested_time: Instant,
     ) {
-        // TODO: [PO] To implement
         let time_since_last_harvest = harvested_time
             .duration_since(self.current_instant)
             .as_secs_f64();
@@ -457,6 +455,6 @@ impl DataCollection {
         gpu.iter().for_each(|data| {
             new_entry.gpu_data.push(data.1.use_percent);
         });
-        self.gpu_harvest = gpu.to_vec();
+        self.gpu_harvest = gpu;
     }
 }
diff --git a/src/canvas/widgets/battery_display.rs b/src/canvas/widgets/battery_display.rs
index 6c175d39..5e579a9c 100644
--- a/src/canvas/widgets/battery_display.rs
+++ b/src/canvas/widgets/battery_display.rs
@@ -164,7 +164,7 @@ impl Painter {
                 }
 
                 let mut battery_rows = Vec::with_capacity(4);
-                battery_rows.push(Row::new(vec![
+                battery_rows.push(Row::new([
                     Cell::from("Charge %").style(self.colours.text_style),
                     Cell::from(bars).style(if charge_percentage < 10.0 {
                         self.colours.low_battery_colour
@@ -175,12 +175,12 @@ impl Painter {
                     }),
                 ]));
                 battery_rows.push(
-                    Row::new(vec!["Rate", &battery_details.watt_consumption])
+                    Row::new(["Rate", &battery_details.watt_consumption])
                         .style(self.colours.text_style),
                 );
 
                 battery_rows.push(
-                    Row::new(vec!["State", &battery_details.state]).style(self.colours.text_style),
+                    Row::new(["State", &battery_details.state]).style(self.colours.text_style),
                 );
 
                 let mut s: String; // Keep string in scope.
@@ -191,20 +191,20 @@ impl Painter {
                             s = long_time(*secs);
 
                             if half_width as usize > s.len() {
-                                battery_rows.push(Row::new(vec!["Time to empty", &s]).style(style));
+                                battery_rows.push(Row::new(["Time to empty", &s]).style(style));
                             } else {
                                 s = short_time(*secs);
-                                battery_rows.push(Row::new(vec!["To empty", &s]).style(style));
+                                battery_rows.push(Row::new(["To empty", &s]).style(style));
                             }
                         }
                         BatteryDuration::ToFull(secs) => {
                             s = long_time(*secs);
 
                             if half_width as usize > s.len() {
-                                battery_rows.push(Row::new(vec!["Time to full", &s]).style(style));
+                                battery_rows.push(Row::new(["Time to full", &s]).style(style));
                             } else {
                                 s = short_time(*secs);
-                                battery_rows.push(Row::new(vec!["To full", &s]).style(style));
+                                battery_rows.push(Row::new(["To full", &s]).style(style));
                             }
                         }
                         BatteryDuration::Empty
@@ -214,15 +214,14 @@ impl Painter {
                 }
 
                 battery_rows.push(
-                    Row::new(vec!["Health %", &battery_details.health])
-                        .style(self.colours.text_style),
+                    Row::new(["Health %", &battery_details.health]).style(self.colours.text_style),
                 );
 
                 // Draw
                 f.render_widget(
                     Table::new(battery_rows)
                         .block(battery_block)
-                        .header(Row::new(vec![""]).bottom_margin(table_gap))
+                        .header(Row::new([""]).bottom_margin(table_gap))
                         .widths(&[Constraint::Percentage(50), Constraint::Percentage(50)]),
                     margined_draw_loc,
                 );
diff --git a/src/canvas/widgets/network_graph.rs b/src/canvas/widgets/network_graph.rs
index bfbe3582..5e6f71d1 100644
--- a/src/canvas/widgets/network_graph.rs
+++ b/src/canvas/widgets/network_graph.rs
@@ -178,7 +178,7 @@ impl Painter {
         let total_tx_display = &app_state.converted_data.total_tx_display;
 
         // Gross but I need it to work...
-        let total_network = vec![Row::new(vec![
+        let total_network = vec![Row::new([
             Text::styled(rx_display, self.colours.rx_style),
             Text::styled(tx_display, self.colours.tx_style),
             Text::styled(total_rx_display, self.colours.total_rx_style),
@@ -188,7 +188,7 @@ impl Painter {
         // Draw
         f.render_widget(
             Table::new(total_network)
-                .header(Row::new(NETWORK_HEADERS.to_vec()).style(self.colours.table_header_style))
+                .header(Row::new(NETWORK_HEADERS).style(self.colours.table_header_style))
                 .block(Block::default().borders(Borders::ALL).border_style(
                     if app_state.current_widget.widget_id == widget_id {
                         self.colours.highlighted_border_style