feature: support default selection of average CPU graph (#1353)

* feature: support default selection of average CPU graph

* test

11 files changed, 152 insertions, 34 deletions

diff --git a/.cargo/config.toml b/.cargo/config.toml
index 4d45f24b..7e766c36 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -3,15 +3,3 @@ rustflags = ["-C", "target-feature=+crt-static"]
 
 [target.i686-pc-windows-msvc]
 rustflags = ["-C", "target-feature=+crt-static"]
-
-# [target.arm-unknown-linux-gnueabihf]
-# linker = "arm-linux-gnueabihf-gcc"
-
-# [target.armv7-unknown-linux-gnueabihf]
-# linker = "arm-linux-gnueabihf-gcc"
-
-# [target.aarch64-unknown-linux-gnu]
-# linker = "aarch64-linux-gnu-gcc"
-
-# [target.aarch64-unknown-linux-musl]
-# linker = "aarch64-linux-musl-gcc"
\ No newline at end of file
diff --git a/docs/content/configuration/config-file/cpu.md b/docs/content/configuration/config-file/cpu.md
new file mode 100644
index 00000000..77d8fe30
--- /dev/null
+++ b/docs/content/configuration/config-file/cpu.md
@@ -0,0 +1,11 @@
+# CPU
+
+## Default CPU Graph Selection
+
+You can configure which CPU graph is shown by default when starting up bottom by setting `cpu.default`.
+
+```toml
+[cpu]
+# One of "all" (default), "average"/"avg"
+default = "average"
+```
diff --git a/sample_configs/default_config.toml b/sample_configs/default_config.toml
index 7d6a9f28..a7731dd6 100644
--- a/sample_configs/default_config.toml
+++ b/sample_configs/default_config.toml
@@ -85,6 +85,10 @@
 #[processes]
 #columns = ["PID", "Name", "CPU%", "Mem%", "R/s", "W/s", "T.Read", "T.Write", "User", "State", "GMEM%", "GPU%"]
 
+# [cpu]
+# One of "all" (default), "average"/"avg"
+# default = "average"
+
 # These are all the components that support custom theming.  Note that colour support
 # will depend on terminal support.
 
diff --git a/src/app.rs b/src/app.rs
index 32f0af06..005a743b 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -49,7 +49,7 @@ pub struct AppConfigFields {
     pub temperature_type: temperature::TemperatureType,
     pub use_dot: bool,
     pub left_legend: bool,
-    pub show_average_cpu: bool,
+    pub show_average_cpu: bool, // TODO: Unify this in CPU options
     pub use_current_cpu_total: bool,
     pub unnormalized_cpu: bool,
     pub use_basic_mode: bool,
@@ -1910,7 +1910,7 @@ impl App {
                         .proc_state
                         .get_mut_widget_state(self.current_widget.widget_id)
                     {
-                        proc_widget_state.table.set_first();
+                        proc_widget_state.table.to_first();
                     }
                 }
                 BottomWidgetType::ProcSort => {
@@ -1919,7 +1919,7 @@ impl App {
                         .proc_state
                         .get_mut_widget_state(self.current_widget.widget_id - 2)
                     {
-                        proc_widget_state.sort_table.set_first();
+                        proc_widget_state.sort_table.to_first();
                     }
                 }
                 BottomWidgetType::Temp => {
@@ -1928,7 +1928,7 @@ impl App {
                         .temp_state
                         .get_mut_widget_state(self.current_widget.widget_id)
                     {
-                        temp_widget_state.table.set_first();
+                        temp_widget_state.table.to_first();
                     }
                 }
                 BottomWidgetType::Disk => {
@@ -1937,7 +1937,7 @@ impl App {
                         .disk_state
                         .get_mut_widget_state(self.current_widget.widget_id)
                     {
-                        disk_widget_state.table.set_first();
+                        disk_widget_state.table.to_first();
                     }
                 }
                 BottomWidgetType::CpuLegend => {
@@ -1946,7 +1946,7 @@ impl App {
                         .cpu_state
                         .get_mut_widget_state(self.current_widget.widget_id - 1)
                     {
-                        cpu_widget_state.table.set_first();
+                        cpu_widget_state.table.to_first();
                     }
                 }
 
@@ -1969,7 +1969,7 @@ impl App {
                         .proc_state
                         .get_mut_widget_state(self.current_widget.widget_id)
                     {
-                        proc_widget_state.table.set_last();
+                        proc_widget_state.table.to_last();
                     }
                 }
                 BottomWidgetType::ProcSort => {
@@ -1978,7 +1978,7 @@ impl App {
                         .proc_state
                         .get_mut_widget_state(self.current_widget.widget_id - 2)
                     {
-                        proc_widget_state.sort_table.set_last();
+                        proc_widget_state.sort_table.to_last();
                     }
                 }
                 BottomWidgetType::Temp => {
@@ -1987,7 +1987,7 @@ impl App {
                         .temp_state
                         .get_mut_widget_state(self.current_widget.widget_id)
                     {
-                        temp_widget_state.table.set_last();
+                        temp_widget_state.table.to_last();
                     }
                 }
                 BottomWidgetType::Disk => {
@@ -1997,7 +1997,7 @@ impl App {
                         .get_mut_widget_state(self.current_widget.widget_id)
                     {
                         if !self.converted_data.disk_data.is_empty() {
-                            disk_widget_state.table.set_last();
+                            disk_widget_state.table.to_last();
                         }
                     }
                 }
@@ -2007,7 +2007,7 @@ impl App {
                         .cpu_state
                         .get_mut_widget_state(self.current_widget.widget_id - 1)
                     {
-                        cpu_widget_state.table.set_last();
+                        cpu_widget_state.table.to_last();
                     }
                 }
                 _ => {}
diff --git a/src/components/data_table.rs b/src/components/data_table.rs
index ed79961a..4ae23d1d 100644
--- a/src/components/data_table.rs
+++ b/src/components/data_table.rs
@@ -40,6 +40,7 @@ pub struct DataTable<DataType, Header, S = Unsortable, C = Column<Header>> {
     data: Vec<DataType>,
     sort_type: S,
     first_draw: bool,
+    first_index: Option<usize>,
     _pd: PhantomData<(DataType, S, Header)>,
 }
 
@@ -55,6 +56,7 @@ impl<DataType: DataToCell<H>, H: ColumnHeader> DataTable<DataType, H, Unsortable
             data: vec![],
             sort_type: Unsortable,
             first_draw: true,
+            first_index: None,
             _pd: PhantomData,
         }
     }
@@ -63,14 +65,20 @@ impl<DataType: DataToCell<H>, H: ColumnHeader> DataTable<DataType, H, Unsortable
 impl<DataType: DataToCell<H>, H: ColumnHeader, S: SortType, C: DataTableColumn<H>>
     DataTable<DataType, H, S, C>
 {
+    /// Sets the default value selected on first initialization, if possible.
+    pub fn first_draw_index(mut self, first_index: usize) -> Self {
+        self.first_index = Some(first_index);
+        self
+    }
+
     /// Sets the scroll position to the first value.
-    pub fn set_first(&mut self) {
+    pub fn to_first(&mut self) {
         self.state.current_index = 0;
         self.state.scroll_direction = ScrollDirection::Up;
     }
 
     /// Sets the scroll position to the last value.
-    pub fn set_last(&mut self) {
+    pub fn to_last(&mut self) {
         self.state.current_index = self.data.len().saturating_sub(1);
         self.state.scroll_direction = ScrollDirection::Down;
     }
@@ -189,11 +197,11 @@ mod test {
         let mut table = DataTable::new(columns, props, styling);
         table.set_data((0..=4).map(|index| TestType { index }).collect::<Vec<_>>());
 
-        table.set_last();
+        table.to_last();
         assert_eq!(table.current_index(), 4);
         assert_eq!(table.state.scroll_direction, ScrollDirection::Down);
 
-        table.set_first();
+        table.to_first();
         assert_eq!(table.current_index(), 0);
         assert_eq!(table.state.scroll_direction, ScrollDirection::Up);
 
diff --git a/src/components/data_table/draw.rs b/src/components/data_table/draw.rs
index 3903f381..91fef6ba 100644
--- a/src/components/data_table/draw.rs
+++ b/src/components/data_table/draw.rs
@@ -200,10 +200,15 @@ where
                 self.props.table_gap
             };
 
-            let columns = &self.columns;
             if !self.data.is_empty() || !self.first_draw {
-                self.first_draw = false; // TODO: Doing it this way is fine, but it could be done better (e.g. showing custom no results/entries message)
+                if self.first_draw {
+                    self.first_draw = false; // TODO: Doing it this way is fine, but it could be done better (e.g. showing custom no results/entries message)
+                    if let Some(first_index) = self.first_index {
+                        self.set_position(first_index);
+                    }
+                }
 
+                let columns = &self.columns;
                 let rows = {
                     let num_rows =
                         usize::from(inner_height.saturating_sub(table_gap + header_height));
diff --git a/src/components/data_table/sortable.rs b/src/components/data_table/sortable.rs
index b44906a4..3a3de1fc 100644
--- a/src/components/data_table/sortable.rs
+++ b/src/components/data_table/sortable.rs
@@ -260,6 +260,7 @@ where
                 order: props.order,
             },
             first_draw: true,
+            first_index: None,
             data: vec![],
             _pd: PhantomData,
         }
diff --git a/src/constants.rs b/src/constants.rs
index f511313e..3ad60f82 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -598,6 +598,10 @@ pub const CONFIG_TEXT: &str = r#"# This is a default config file for bottom.  Al
 #   PID, Name, CPU%, Mem%, R/s, W/s, T.Read, T.Write, User, State, Time, GMem%, GPU%
 #columns = ["PID", "Name", "CPU%", "Mem%", "R/s", "W/s", "T.Read", "T.Write", "User", "State", "GMEM%", "GPU%"]
 
+# [cpu]
+# One of "all" (default), "average"/"avg"
+# default = "average"
+
 # These are all the components that support custom theming.  Note that colour support
 # will depend on terminal support.
 #[colors] # Uncomment if you want to use custom colors
diff --git a/src/options.rs b/src/options.rs
index 152db131..08c96e34 100644
--- a/src/options.rs
+++ b/src/options.rs
@@ -28,8 +28,11 @@ use crate::{
 
 pub mod layout_options;
 
-pub mod process_columns;
-use self::process_columns::ProcessConfig;
+mod process_columns;
+pub use process_columns::ProcessConfig;
+
+mod cpu;
+pub use cpu::{CpuConfig, CpuDefault};
 
 use anyhow::{Context, Result};
 
@@ -43,6 +46,7 @@ pub struct Config {
     pub temp_filter: Option<IgnoreList>,
     pub net_filter: Option<IgnoreList>,
     pub processes: Option<ProcessConfig>,
+    pub cpu: Option<CpuConfig>,
 }
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
@@ -340,6 +344,11 @@ pub fn build_app(
                                 widget.widget_id,
                                 CpuWidgetState::new(
                                     &app_config_fields,
+                                    config
+                                        .cpu
+                                        .as_ref()
+                                        .map(|cfg| cfg.default)
+                                        .unwrap_or_default(),
                                     default_time_value,
                                     autohide_timer,
                                     styling,
diff --git a/src/options/cpu.rs b/src/options/cpu.rs
new file mode 100644
index 00000000..ce027305
--- /dev/null
+++ b/src/options/cpu.rs
@@ -0,0 +1,79 @@
+use serde::Deserialize;
+
+/// The default selection of the CPU widget. If the given selection is invalid, we will fall back to all.
+#[derive(Clone, Copy, Debug, Default, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum CpuDefault {
+    #[default]
+    All,
+    #[serde(alias = "avg")]
+    Average,
+}
+
+/// Process column settings.
+#[derive(Clone, Debug, Default, Deserialize)]
+pub struct CpuConfig {
+    #[serde(default)]
+    pub default: CpuDefault,
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn default_cpu_default() {
+        let config = "";
+        let generated: CpuConfig = toml_edit::de::from_str(config).unwrap();
+        match generated.default {
+            CpuDefault::All => {}
+            CpuDefault::Average => {
+                panic!("the default should be all")
+            }
+        }
+    }
+
+    #[test]
+    fn all_cpu_default() {
+        let config = r#"
+            default = "all"
+        "#;
+        let generated: CpuConfig = toml_edit::de::from_str(config).unwrap();
+        match generated.default {
+            CpuDefault::All => {}
+            CpuDefault::Average => {
+                panic!("the default should be all")
+            }
+        }
+    }
+
+    #[test]
+    fn avg_cpu_default() {
+        let config = r#"
+            default = "avg"
+        "#;
+
+        let generated: CpuConfig = toml_edit::de::from_str(config).unwrap();
+        match generated.default {
+            CpuDefault::All => {
+                panic!("the avg should be set")
+            }
+            CpuDefault::Average => {}
+        }
+    }
+
+    #[test]
+    fn average_cpu_default() {
+        let config = r#"
+            default = "average"
+        "#;
+
+        let generated: CpuConfig = toml_edit::de::from_str(config).unwrap();
+        match generated.default {
+            CpuDefault::All => {
+                panic!("the avg should be set")
+            }
+            CpuDefault::Average => {}
+        }
+    }
+}
diff --git a/src/widgets/cpu_graph.rs b/src/widgets/cpu_graph.rs
index 2b555c10..3d3e6df1 100644
--- a/src/widgets/cpu_graph.rs
+++ b/src/widgets/cpu_graph.rs
@@ -11,6 +11,7 @@ use crate::{
         DataToCell,
     },
     data_conversion::CpuWidgetData,
+    options::CpuDefault,
     utils::gen_util::truncate_to_text,
 };
 
@@ -165,8 +166,8 @@ pub struct CpuWidgetState {
 
 impl CpuWidgetState {
     pub fn new(
-        config: &AppConfigFields, current_display_time: u64, autohide_timer: Option<Instant>,
-        colours: &CanvasStyling,
+        config: &AppConfigFields, default_selection: CpuDefault, current_display_time: u64,
+        autohide_timer: Option<Instant>, colours: &CanvasStyling,
     ) -> Self {
         const COLUMNS: [Column<CpuWidgetColumn>; 2] = [
             Column::soft(CpuWidgetColumn::CPU, Some(0.5)),
@@ -183,13 +184,21 @@ impl CpuWidgetState {
         };
 
         let styling = DataTableStyling::from_colours(colours);
+        let mut table = DataTable::new(COLUMNS, props, styling);
+        match default_selection {
+            CpuDefault::All => {}
+            CpuDefault::Average if !config.show_average_cpu => {}
+            CpuDefault::Average => {
+                table = table.first_draw_index(1);
+            }
+        }
 
         CpuWidgetState {
             current_display_time,
             is_legend_hidden: false,
             show_avg: config.show_average_cpu,
             autohide_timer,
-            table: DataTable::new(COLUMNS, props, styling),
+            table,
             styling: CpuWidgetStyling::from_colours(colours),
         }
     }