config: Extract appearance and layout

niri-config/src/layer_rule.rs

@@ -1,5 +1,5 @@
+use crate::appearance::{BlockOutFrom, CornerRadius, ShadowRule};
 use crate::utils::RegexEq;
-use crate::{BlockOutFrom, CornerRadius, ShadowRule};
 
 #[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]
 pub struct LayerRule {

niri-config/src/layout.rs

@@ -0,0 +1,132 @@
+use knuffel::errors::DecodeError;
+use niri_ipc::{ColumnDisplay, SizeChange};
+
+use crate::appearance::{
+    Border, FocusRing, InsertHint, Shadow, TabIndicator, DEFAULT_BACKGROUND_COLOR,
+};
+use crate::{expect_only_children, Color, FloatOrInt};
+
+#[derive(knuffel::Decode, Debug, Clone, PartialEq)]
+pub struct Layout {
+    #[knuffel(child, default)]
+    pub focus_ring: FocusRing,
+    #[knuffel(child, default)]
+    pub border: Border,
+    #[knuffel(child, default)]
+    pub shadow: Shadow,
+    #[knuffel(child, default)]
+    pub tab_indicator: TabIndicator,
+    #[knuffel(child, default)]
+    pub insert_hint: InsertHint,
+    #[knuffel(child, unwrap(children), default)]
+    pub preset_column_widths: Vec<PresetSize>,
+    #[knuffel(child)]
+    pub default_column_width: Option<DefaultPresetSize>,
+    #[knuffel(child, unwrap(children), default)]
+    pub preset_window_heights: Vec<PresetSize>,
+    #[knuffel(child, unwrap(argument), default)]
+    pub center_focused_column: CenterFocusedColumn,
+    #[knuffel(child)]
+    pub always_center_single_column: bool,
+    #[knuffel(child)]
+    pub empty_workspace_above_first: bool,
+    #[knuffel(child, unwrap(argument, str), default = Self::default().default_column_display)]
+    pub default_column_display: ColumnDisplay,
+    #[knuffel(child, unwrap(argument), default = Self::default().gaps)]
+    pub gaps: FloatOrInt<0, 65535>,
+    #[knuffel(child, default)]
+    pub struts: Struts,
+    #[knuffel(child, default = DEFAULT_BACKGROUND_COLOR)]
+    pub background_color: Color,
+}
+
+impl Default for Layout {
+    fn default() -> Self {
+        Self {
+            focus_ring: Default::default(),
+            border: Default::default(),
+            shadow: Default::default(),
+            tab_indicator: Default::default(),
+            insert_hint: Default::default(),
+            preset_column_widths: Default::default(),
+            default_column_width: Default::default(),
+            center_focused_column: Default::default(),
+            always_center_single_column: false,
+            empty_workspace_above_first: false,
+            default_column_display: ColumnDisplay::Normal,
+            gaps: FloatOrInt(16.),
+            struts: Default::default(),
+            preset_window_heights: Default::default(),
+            background_color: DEFAULT_BACKGROUND_COLOR,
+        }
+    }
+}
+
+#[derive(knuffel::Decode, Debug, Clone, Copy, PartialEq)]
+pub enum PresetSize {
+    Proportion(#[knuffel(argument)] f64),
+    Fixed(#[knuffel(argument)] i32),
+}
+
+impl From<PresetSize> for SizeChange {
+    fn from(value: PresetSize) -> Self {
+        match value {
+            PresetSize::Proportion(prop) => SizeChange::SetProportion(prop * 100.),
+            PresetSize::Fixed(fixed) => SizeChange::SetFixed(fixed),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct DefaultPresetSize(pub Option<PresetSize>);
+
+#[derive(knuffel::Decode, Debug, Default, Clone, Copy, PartialEq)]
+pub struct Struts {
+    #[knuffel(child, unwrap(argument), default)]
+    pub left: FloatOrInt<-65535, 65535>,
+    #[knuffel(child, unwrap(argument), default)]
+    pub right: FloatOrInt<-65535, 65535>,
+    #[knuffel(child, unwrap(argument), default)]
+    pub top: FloatOrInt<-65535, 65535>,
+    #[knuffel(child, unwrap(argument), default)]
+    pub bottom: FloatOrInt<-65535, 65535>,
+}
+
+#[derive(knuffel::DecodeScalar, Debug, Default, PartialEq, Eq, Clone, Copy)]
+pub enum CenterFocusedColumn {
+    /// Focusing a column will not center the column.
+    #[default]
+    Never,
+    /// The focused column will always be centered.
+    Always,
+    /// Focusing a column will center it if it doesn't fit on the screen together with the
+    /// previously focused column.
+    OnOverflow,
+}
+
+impl<S> knuffel::Decode<S> for DefaultPresetSize
+where
+    S: knuffel::traits::ErrorSpan,
+{
+    fn decode_node(
+        node: &knuffel::ast::SpannedNode<S>,
+        ctx: &mut knuffel::decode::Context<S>,
+    ) -> Result<Self, DecodeError<S>> {
+        expect_only_children(node, ctx);
+
+        let mut children = node.children();
+
+        if let Some(child) = children.next() {
+            if let Some(unwanted_child) = children.next() {
+                ctx.emit_error(DecodeError::unexpected(
+                    unwanted_child,
+                    "node",
+                    "expected no more than one child",
+                ));
+            }
+            PresetSize::decode_node(child, ctx).map(Some).map(Self)
+        } else {
+            Ok(Self(None))
+        }
+    }
+}

niri-config/src/window_rule.rs

@@ -1,10 +1,9 @@
 use niri_ipc::ColumnDisplay;
 
+use crate::appearance::{BlockOutFrom, BorderRule, CornerRadius, ShadowRule, TabIndicatorRule};
+use crate::layout::DefaultPresetSize;
 use crate::utils::RegexEq;
-use crate::{
-    BlockOutFrom, BorderRule, CornerRadius, DefaultPresetSize, FloatOrInt, ShadowRule,
-    TabIndicatorRule,
-};
+use crate::FloatOrInt;
 
 #[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]
 pub struct WindowRule {