Add dashboard subsystem and settings integration

dashboard.json

@@ -0,0 +1,52 @@
+{
+  "version": 1,
+  "grid": {
+    "rows": 3,
+    "cols": 3
+  },
+  "slots": [
+    {
+      "id": "Weather",
+      "widget": "weather_site",
+      "row": 0,
+      "col": 0,
+      "row_span": 1,
+      "col_span": 2,
+      "settings": {
+        "location": "Seattle"
+      }
+    },
+    {
+      "id": "Recents",
+      "widget": "recent_commands",
+      "row": 1,
+      "col": 0,
+      "row_span": 1,
+      "col_span": 1
+    },
+    {
+      "id": "Frequently used",
+      "widget": "frequent_commands",
+      "row": 1,
+      "col": 1,
+      "row_span": 1,
+      "col_span": 1
+    },
+    {
+      "id": "Todos",
+      "widget": "todo_summary",
+      "row": 2,
+      "col": 0,
+      "row_span": 1,
+      "col_span": 1
+    },
+    {
+      "id": "Notes",
+      "widget": "notes_open",
+      "row": 2,
+      "col": 1,
+      "row_span": 1,
+      "col_span": 1
+    }
+  ]
+}

src/dashboard/config.rs

@@ -0,0 +1,153 @@
+use crate::dashboard::widgets::WidgetRegistry;
+use serde::{Deserialize, Serialize};
+use serde_json::json;
+use std::path::{Path, PathBuf};
+
+fn default_version() -> u32 {
+    1
+}
+
+fn default_rows() -> u8 {
+    3
+}
+
+fn default_cols() -> u8 {
+    3
+}
+
+fn default_span() -> u8 {
+    1
+}
+
+/// Grid definition for the dashboard layout.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub struct GridConfig {
+    #[serde(default = "default_rows")]
+    pub rows: u8,
+    #[serde(default = "default_cols")]
+    pub cols: u8,
+}
+
+impl Default for GridConfig {
+    fn default() -> Self {
+        Self {
+            rows: default_rows(),
+            cols: default_cols(),
+        }
+    }
+}
+
+/// Widget slot configuration.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct SlotConfig {
+    #[serde(default)]
+    pub id: Option<String>,
+    #[serde(default)]
+    pub widget: String,
+    pub row: i32,
+    pub col: i32,
+    #[serde(default = "default_span")]
+    pub row_span: u8,
+    #[serde(default = "default_span")]
+    pub col_span: u8,
+    #[serde(default)]
+    pub settings: serde_json::Value,
+}
+
+impl SlotConfig {
+    pub fn with_widget(widget: &str, row: i32, col: i32) -> Self {
+        Self {
+            id: None,
+            widget: widget.to_string(),
+            row,
+            col,
+            row_span: default_span(),
+            col_span: default_span(),
+            settings: serde_json::Value::Object(Default::default()),
+        }
+    }
+}
+
+/// Primary dashboard configuration.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct DashboardConfig {
+    #[serde(default = "default_version")]
+    pub version: u32,
+    #[serde(default)]
+    pub grid: GridConfig,
+    #[serde(default)]
+    pub slots: Vec<SlotConfig>,
+}
+
+impl Default for DashboardConfig {
+    fn default() -> Self {
+        Self {
+            version: default_version(),
+            grid: GridConfig::default(),
+            slots: vec![
+                SlotConfig::with_widget("weather_site", 0, 0),
+                SlotConfig::with_widget("recent_commands", 1, 0),
+                SlotConfig::with_widget("frequent_commands", 1, 1),
+                SlotConfig::with_widget("todo_summary", 2, 0),
+                SlotConfig::with_widget("notes_open", 2, 1),
+            ],
+        }
+    }
+}
+
+impl DashboardConfig {
+    /// Load a configuration from disk. Unknown widget types or invalid slots are
+    /// filtered out using the provided registry.
+    pub fn load(path: impl AsRef<Path>, registry: &WidgetRegistry) -> anyhow::Result<Self> {
+        let path = path.as_ref();
+        let content = std::fs::read_to_string(path).unwrap_or_default();
+        if content.trim().is_empty() {
+            return Ok(Self::default());
+        }
+        let mut cfg: DashboardConfig = serde_json::from_str(&content)?;
+        let warnings = cfg.sanitize(registry);
+        for w in warnings {
+            tracing::warn!("{w}");
+        }
+        Ok(cfg)
+    }
+
+    /// Save the configuration to disk.
+    pub fn save(&self, path: impl AsRef<Path>) -> anyhow::Result<()> {
+        let json = serde_json::to_string_pretty(self)?;
+        std::fs::write(path, json)?;
+        Ok(())
+    }
+
+    /// Remove unsupported widgets and normalize empty settings.
+    pub fn sanitize(&mut self, registry: &WidgetRegistry) -> Vec<String> {
+        let mut warnings = Vec::new();
+        self.slots.retain(|slot| {
+            if slot.widget.is_empty() {
+                return false;
+            }
+            if !registry.contains(&slot.widget) {
+                let msg = format!("unknown dashboard widget '{}' dropped", slot.widget);
+                tracing::warn!(widget = %slot.widget, "unknown dashboard widget dropped");
+                warnings.push(msg);
+                return false;
+            }
+            true
+        });
+        for slot in &mut self.slots {
+            if slot.settings.is_null() {
+                slot.settings = json!({});
+            }
+        }
+        warnings
+    }
+
+    pub fn path_for(base: &str) -> PathBuf {
+        let base = Path::new(base);
+        if base.is_dir() {
+            base.join("dashboard.json")
+        } else {
+            PathBuf::from(base)
+        }
+    }
+}

src/dashboard/dashboard.rs

@@ -0,0 +1,152 @@
+use crate::dashboard::config::DashboardConfig;
+use crate::dashboard::layout::{normalize_slots, NormalizedSlot};
+use crate::dashboard::widgets::{WidgetAction, WidgetRegistry};
+use crate::{actions::Action, common::json_watch::JsonWatcher};
+use eframe::egui;
+use std::path::{Path, PathBuf};
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum DashboardEvent {
+    Reloaded,
+}
+
+/// Source of a widget activation.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum WidgetActivation {
+    Click,
+    Keyboard,
+}
+
+/// Context shared with widgets at render time.
+pub struct DashboardContext<'a> {
+    pub actions: &'a [Action],
+    pub usage: &'a std::collections::HashMap<String, u32>,
+    pub plugins: &'a crate::plugin::PluginManager,
+    pub default_location: Option<&'a str>,
+}
+
+pub struct Dashboard {
+    config_path: PathBuf,
+    pub config: DashboardConfig,
+    pub slots: Vec<NormalizedSlot>,
+    registry: WidgetRegistry,
+    watcher: Option<JsonWatcher>,
+    pub warnings: Vec<String>,
+    event_cb: Option<std::sync::Arc<dyn Fn(DashboardEvent) + Send + Sync>>,
+}
+
+impl Dashboard {
+    pub fn new(
+        config_path: impl AsRef<Path>,
+        registry: WidgetRegistry,
+        event_cb: Option<std::sync::Arc<dyn Fn(DashboardEvent) + Send + Sync>>,
+    ) -> Self {
+        let path = config_path.as_ref().to_path_buf();
+        let (config, slots, warnings) = Self::load_internal(&path, &registry);
+        Self {
+            config_path: path,
+            config,
+            slots,
+            registry,
+            watcher: None,
+            warnings,
+            event_cb,
+        }
+    }
+
+    fn load_internal(
+        path: &Path,
+        registry: &WidgetRegistry,
+    ) -> (DashboardConfig, Vec<NormalizedSlot>, Vec<String>) {
+        let cfg = DashboardConfig::load(path, registry).unwrap_or_default();
+        let (slots, mut warnings) = normalize_slots(&cfg, registry);
+        if slots.is_empty() {
+            warnings.push("dashboard has no valid slots".into());
+        }
+        (cfg, slots, warnings)
+    }
+
+    pub fn reload(&mut self) {
+        let (cfg, slots, warnings) = Self::load_internal(&self.config_path, &self.registry);
+        self.config = cfg;
+        self.slots = slots;
+        self.warnings = warnings;
+    }
+
+    pub fn set_path(&mut self, path: impl AsRef<Path>) {
+        self.config_path = path.as_ref().to_path_buf();
+        self.reload();
+        self.attach_watcher();
+    }
+
+    pub fn attach_watcher(&mut self) {
+        let path = self.config_path.clone();
+        let tx = self.event_cb.clone();
+        self.watcher = crate::common::json_watch::watch_json(path.clone(), move || {
+            tracing::info!("dashboard config changed");
+            if let Some(tx) = &tx {
+                (tx)(DashboardEvent::Reloaded);
+            }
+        })
+        .ok();
+    }
+
+    pub fn ui(
+        &mut self,
+        ui: &mut egui::Ui,
+        ctx: &DashboardContext<'_>,
+        activation: WidgetActivation,
+    ) -> Option<WidgetAction> {
+        let mut clicked = None;
+        let grid_cols = self.config.grid.cols.max(1) as usize;
+        let col_width = ui.available_width() / grid_cols.max(1) as f32;
+
+        let size = egui::vec2(ui.available_width(), ui.available_height());
+        let (rect, _) = ui.allocate_exact_size(size, egui::Sense::hover());
+        let mut child = ui.child_ui(rect, egui::Layout::top_down(egui::Align::LEFT));
+
+        for slot in &self.slots {
+            let rect = egui::Rect::from_min_size(
+                rect.min
+                    + egui::vec2(
+                        col_width * slot.col as f32,
+                        (slot.row as f32) * 100.0, // coarse row height
+                    ),
+                egui::vec2(
+                    col_width * slot.col_span as f32,
+                    90.0 * slot.row_span as f32,
+                ),
+            );
+            let mut slot_ui = child.child_ui(rect, egui::Layout::left_to_right(egui::Align::TOP));
+            if let Some(action) = self.render_slot(slot, &mut slot_ui, ctx, activation) {
+                clicked = Some(action);
+            }
+        }
+
+        clicked
+    }
+
+    fn render_slot(
+        &self,
+        slot: &NormalizedSlot,
+        ui: &mut egui::Ui,
+        ctx: &DashboardContext<'_>,
+        activation: WidgetActivation,
+    ) -> Option<WidgetAction> {
+        ui.group(|ui| {
+            ui.vertical(|ui| {
+                let heading = slot.id.as_deref().unwrap_or(&slot.widget);
+                ui.heading(heading);
+                self.registry
+                    .create(&slot.widget, &slot.settings)
+                    .and_then(|mut w| w.render(ui, ctx, activation))
+            })
+            .inner
+        })
+        .inner
+    }
+
+    pub fn registry(&self) -> &WidgetRegistry {
+        &self.registry
+    }
+}