tmp committuine

15 files changed, 449 insertions, 109 deletions

diff --git a/Cargo.lock b/Cargo.lock
index af64176f..ba3f7c2f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -247,6 +247,7 @@ dependencies = [
  "float-ord",
  "futures",
  "futures-timer",
+ "gapbuffer",
  "heim",
  "indextree",
  "itertools",
@@ -709,6 +710,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "gapbuffer"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e929b3ff01e4accdce7f5596a044890b5052ab7418ba8ce9ce5865d26ae4417"
+
+[[package]]
 name = "getrandom"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index 7cf45e5b..25aeb90d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,6 @@ path = "src/bin/main.rs"
 doc = false
 
 [lib]
-test = false
 doctest = false
 doc = false
 
@@ -43,6 +42,7 @@ enum_dispatch = "0.3.7"
 float-ord = "0.3.2"
 futures = "0.3.14"
 futures-timer = "3.0.2" # TODO: Remove?
+gapbuffer = "0.1.1"
 indextree = "4.3.1" # TODO: Remove?
 itertools = "0.10.0"
 once_cell = "1.5.2"
diff --git a/src/tuine/component/base/block.rs b/src/tuine/component/base/block.rs
index 99776ffe..743a39d7 100644
--- a/src/tuine/component/base/block.rs
+++ b/src/tuine/component/base/block.rs
@@ -12,6 +12,13 @@ pub struct StyleSheet {
     pub border: Style,
 }
 
+struct BorderOffsets {
+    left: u16,
+    right: u16,
+    top: u16,
+    bottom: u16,
+}
+
 /// A [`Block`] is a widget that draws a border around a child [`Component`], as well as optional
 /// titles.
 pub struct Block<Message, Child>
@@ -51,49 +58,30 @@ where
         self
     }
 
-    fn inner_rect(&self, original: Rect) -> Rect {
-        let mut inner = original;
-
-        if self.borders.intersects(Borders::LEFT) {
-            inner.x = inner.x.saturating_add(1).min(inner.right());
-            inner.width = inner.width.saturating_sub(1);
-        }
-        if self.borders.intersects(Borders::TOP)
-            || self.left_text.is_some()
-            || self.right_text.is_some()
-        {
-            inner.y = inner.y.saturating_add(1).min(inner.bottom());
-            inner.height = inner.height.saturating_sub(1);
-        }
-        if self.borders.intersects(Borders::RIGHT) {
-            inner.width = inner.width.saturating_sub(1);
-        }
-        if self.borders.intersects(Borders::BOTTOM) {
-            inner.height = inner.height.saturating_sub(1);
-        }
-        inner
+    pub fn borders(mut self, borders: Borders) -> Self {
+        self.borders = borders;
+        self
     }
 
-    fn outer_size(&self, original: Size) -> Size {
-        let mut outer = original;
-
-        if self.borders.intersects(Borders::LEFT) {
-            outer.width = outer.width.saturating_add(1);
-        }
-        if self.borders.intersects(Borders::TOP)
-            || self.left_text.is_some()
-            || self.right_text.is_some()
-        {
-            outer.height = outer.height.saturating_add(1);
-        }
-        if self.borders.intersects(Borders::RIGHT) {
-            outer.width = outer.width.saturating_add(1);
-        }
-        if self.borders.intersects(Borders::BOTTOM) {
-            outer.height = outer.height.saturating_add(1);
+    fn border_offsets(&self) -> BorderOffsets {
+        fn border_val(has_val: bool) -> u16 {
+            if has_val {
+                1
+            } else {
+                0
+            }
         }
 
-        outer
+        BorderOffsets {
+            left: border_val(self.borders.intersects(Borders::LEFT)),
+            right: border_val(self.borders.intersects(Borders::RIGHT)),
+            top: border_val(
+                self.borders.intersects(Borders::TOP)
+                    || self.left_text.is_some()
+                    || self.right_text.is_some(),
+            ),
+            bottom: border_val(self.borders.intersects(Borders::BOTTOM)),
+        }
     }
 }
 
@@ -108,17 +96,17 @@ where
         B: Backend,
     {
         let rect = draw_ctx.global_rect();
-
-        frame.render_widget(
-            tui::widgets::Block::default()
-                .borders(self.borders)
-                .border_style(self.style_sheet.border),
-            rect,
-        );
-
-        if let Some(child) = &mut self.child {
-            if let Some(child_draw_ctx) = draw_ctx.children().next() {
-                child.draw(state_ctx, &child_draw_ctx, frame)
+        if rect.area() > 0 {
+            frame.render_widget(
+                tui::widgets::Block::default()
+                    .borders(self.borders)
+                    .border_style(self.style_sheet.border),
+                rect,
+            );
+            if let Some(child) = &mut self.child {
+                if let Some(child_draw_ctx) = draw_ctx.children().next() {
+                    child.draw(state_ctx, &child_draw_ctx, frame)
+                }
             }
         }
     }
@@ -136,29 +124,45 @@ where
         Status::Ignored
     }
 
-    fn layout(&self, bounds: Bounds, node: &mut LayoutNode) -> crate::tuine::Size {
+    fn layout(&self, bounds: Bounds, node: &mut LayoutNode) -> Size {
         if let Some(child) = &self.child {
-            // Reduce bounds based on borders
-            let inner_rect = self.inner_rect(Rect::new(0, 0, bounds.max_width, bounds.max_height));
-            let child_bounds = Bounds {
-                min_width: bounds.min_width,
-                min_height: bounds.min_height,
-                max_width: inner_rect.width,
-                max_height: inner_rect.height,
-            };
-
-            let mut child_node = LayoutNode::default();
-            let child_size = child.layout(child_bounds, &mut child_node);
-
-            child_node.rect = Rect::new(
-                inner_rect.x,
-                inner_rect.y,
-                child_size.width,
-                child_size.height,
-            );
-            node.children = vec![child_node];
+            let BorderOffsets {
+                left: left_offset,
+                right: right_offset,
+                top: top_offset,
+                bottom: bottom_offset,
+            } = self.border_offsets();
+
+            let vertical_offset = top_offset + bottom_offset;
+            let horizontal_offset = left_offset + right_offset;
+
+            if bounds.max_height > vertical_offset && bounds.max_width > horizontal_offset {
+                let max_width = bounds.max_width - horizontal_offset;
+                let max_height = bounds.max_height - vertical_offset;
+
+                let child_bounds = Bounds {
+                    min_width: bounds.min_width,
+                    min_height: bounds.min_height,
+                    max_width,
+                    max_height,
+                };
+                let mut child_node = LayoutNode::default();
+                let child_size = child.layout(child_bounds, &mut child_node);
 
-            self.outer_size(child_size)
+                child_node.rect =
+                    Rect::new(left_offset, top_offset, child_size.width, child_size.height);
+                node.children = vec![child_node];
+
+                Size {
+                    width: child_size.width + horizontal_offset,
+                    height: child_size.height + vertical_offset,
+                }
+            } else {
+                Size {
+                    width: 0,
+                    height: 0,
+                }
+            }
         } else {
             Size {
                 width: 0,
@@ -167,3 +171,278 @@ where
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::tuine::Empty;
+
+    use super::*;
+
+    fn assert_border_offset(block: Block<(), Empty>, left: u16, right: u16, top: u16, bottom: u16) {
+        let offsets = block.border_offsets();
+        assert_eq!(offsets.left, left, "left offset should be equal");
+        assert_eq!(offsets.right, right, "right offset should be equal");
+        assert_eq!(offsets.top, top, "top offset should be equal");
+        assert_eq!(offsets.bottom, bottom, "bottom offset should be equal");
+    }
+
+    #[test]
+    fn empty_border_offset() {
+        let block: Block<(), Empty> = Block::with_child(Empty::default()).borders(Borders::empty());
+        assert_border_offset(block, 0, 0, 0, 0);
+    }
+
+    #[test]
+    fn all_border_offset() {
+        let block: Block<(), Empty> = Block::with_child(Empty::default());
+        assert_border_offset(block, 1, 1, 1, 1);
+    }
+
+    #[test]
+    fn horizontal_border_offset() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::LEFT.union(Borders::RIGHT));
+        assert_border_offset(block, 1, 1, 0, 0);
+    }
+
+    #[test]
+    fn vertical_border_offset() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::BOTTOM.union(Borders::TOP));
+        assert_border_offset(block, 0, 0, 1, 1);
+    }
+
+    #[test]
+    fn top_right() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::RIGHT.union(Borders::TOP));
+        assert_border_offset(block, 0, 1, 1, 0);
+    }
+
+    #[test]
+    fn bottom_left() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::BOTTOM.union(Borders::LEFT));
+        assert_border_offset(block, 1, 0, 0, 1);
+    }
+
+    #[test]
+    fn full_layout() {
+        let block: Block<(), Empty> = Block::with_child(Empty::default());
+        let mut layout_node = LayoutNode::default();
+        let bounds = Bounds {
+            min_width: 0,
+            min_height: 0,
+            max_width: 10,
+            max_height: 10,
+        };
+
+        assert_eq!(
+            block.layout(bounds, &mut layout_node),
+            Size {
+                width: 10,
+                height: 10,
+            },
+            "the block should have dimensions (10, 10)."
+        );
+
+        assert_eq!(
+            layout_node.children[0].rect,
+            Rect {
+                x: 1,
+                y: 1,
+                width: 8,
+                height: 8
+            },
+            "the only child should have an offset of (1, 1), and dimensions (8, 8)"
+        );
+    }
+
+    #[test]
+    fn vertical_layout() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::BOTTOM.union(Borders::TOP));
+        let mut layout_node = LayoutNode::default();
+        let bounds = Bounds {
+            min_width: 0,
+            min_height: 0,
+            max_width: 10,
+            max_height: 10,
+        };
+
+        assert_eq!(
+            block.layout(bounds, &mut layout_node),
+            Size {
+                width: 10,
+                height: 10,
+            },
+            "the block should have dimensions (10, 10)."
+        );
+
+        assert_eq!(
+            layout_node.children[0].rect,
+            Rect {
+                x: 0,
+                y: 1,
+                width: 10,
+                height: 8
+            },
+            "the only child should have an offset of (0, 1), and dimensions (10, 8)"
+        );
+    }
+
+    #[test]
+    fn horizontal_layout() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::LEFT.union(Borders::RIGHT));
+        let mut layout_node = LayoutNode::default();
+        let bounds = Bounds {
+            min_width: 0,
+            min_height: 0,
+            max_width: 10,
+            max_height: 10,
+        };
+
+        assert_eq!(
+            block.layout(bounds, &mut layout_node),
+            Size {
+                width: 10,
+                height: 10,
+            },
+            "the block should have dimensions (10, 10)."
+        );
+
+        assert_eq!(
+            layout_node.children[0].rect,
+            Rect {
+                x: 1,
+                y: 0,
+                width: 8,
+                height: 10
+            },
+            "the only child should have an offset of (1, 0), and dimensions (8, 10)"
+        );
+    }
+
+    #[test]
+    fn irregular_layout_one() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::LEFT.union(Borders::TOP));
+        let mut layout_node = LayoutNode::default();
+        let bounds = Bounds {
+            min_width: 0,
+            min_height: 0,
+            max_width: 10,
+            max_height: 10,
+        };
+
+        assert_eq!(
+            block.layout(bounds, &mut layout_node),
+            Size {
+                width: 10,
+                height: 10,
+            },
+            "the block should have dimensions (10, 10)."
+        );
+
+        assert_eq!(
+            layout_node.children[0].rect,
+            Rect {
+                x: 1,
+                y: 1,
+                width: 9,
+                height: 9
+            },
+            "the only child should have an offset of (1, 1), and dimensions (9, 9)"
+        );
+    }
+
+    #[test]
+    fn irregular_layout_two() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::BOTTOM.union(Borders::RIGHT));
+        let mut layout_node = LayoutNode::default();
+        let bounds = Bounds {
+            min_width: 0,
+            min_height: 0,
+            max_width: 10,
+            max_height: 10,
+        };
+
+        assert_eq!(
+            block.layout(bounds, &mut layout_node),
+            Size {
+                width: 10,
+                height: 10,
+            },
+            "the block should have dimensions (10, 10)."
+        );
+
+        assert_eq!(
+            layout_node.children[0].rect,
+            Rect {
+                x: 0,
+                y: 0,
+                width: 9,
+                height: 9
+            },
+            "the only child should have an offset of (0, 0), and dimensions (9, 9)"
+        );
+    }
+
+    #[test]
+    fn irregular_layout_three() {
+        let block: Block<(), Empty> =
+            Block::with_child(Empty::default()).borders(Borders::RIGHT.union(Borders::TOP));
+        let mut layout_node = LayoutNode::default();
+        let bounds = Bounds {
+            min_width: 0,
+            min_height: 0,
+            max_width: 10,
+            max_height: 10,
+        };
+
+        assert_eq!(
+            block.layout(bounds, &mut layout_node),
+            Size {
+                width: 10,
+                height: 10,
+            },
+            "the block should have dimensions (10, 10)."
+        );
+
+        assert_eq!(
+            layout_node.children[0].rect,
+            Rect {
+                x: 0,
+                y: 1,
+                width: 9,
+                height: 9
+            },
+            "the only child should have an offset of (0, 1), and dimensions (9, 9)"
+        );
+    }
+
+    #[test]
+    fn too_small_layout() {
+        let block: Block<(), Empty> = Block::with_child(Empty::default());
+        let mut layout_node = LayoutNode::default();
+        let bounds = Bounds {
+            min_width: 0,
+            min_height: 0,
+            max_width: 2,
+            max_height: 2,
+        };
+
+        assert_eq!(
+            block.layout(bounds, &mut layout_node),
+            Size {
+                width: 0,
+                height: 0,
+            },
+            "the area should be 0"
+        );
+
+        assert_eq!(layout_node.children.len(), 0, "layout node should be empty");
+    }
+}
diff --git a/src/tuine/component/base/flex/mod.rs b/src/tuine/component/base/flex/mod.rs
index d4262069..99a8f555 100644
--- a/src/tuine/component/base/flex/mod.rs
+++ b/src/tuine/component/base/flex/mod.rs
@@ -191,14 +191,16 @@ impl<Message> TmpComponent<Message> for Flex<Message> {
         // If there is still remaining space after, distribute the rest if
         // appropriate (e.x. current_size is too small for the bounds).
         if current_size.width < bounds.min_width {
-            // For now, we'll cheat and just set it to be equal.
+            // FIXME: For now, we'll cheat and just set it to be equal.
             current_size.width = bounds.min_width;
         }
         if current_size.height < bounds.min_height {
-            // For now, we'll cheat and just set it to be equal.
+            // FIXME: For now, we'll cheat and just set it to be equal.
             current_size.height = bounds.min_height;
         }
 
+        // FIXME: Remove area 0 children
+
         // Now that we're done determining sizes, convert all children into the appropriate
         // layout nodes.  Remember - parents determine children, and so, we determine
         // children here!
diff --git a/src/tuine/component/base/padding.rs b/src/tuine/component/base/padding.rs
index e69de29b..c7c1ef9e 100644
--- a/src/tuine/component/base/padding.rs
+++ b/src/tuine/component/base/padding.rs
@@ -0,0 +1,16 @@
+use std::marker::PhantomData;
+
+use crate::tuine::TmpComponent;
+
+/// A [`Padding`] surrounds a child widget with spacing.
+pub struct Padding<Child, Message>
+where
+    Child: TmpComponent<Message>,
+{
+    _pd: PhantomData<Message>,
+    padding_left: u16,
+    padding_right: u16,
+    padding_up: u16,
+    padding_down: u16,
+    child: Option<Child>,
+}
diff --git a/src/tuine/component/base/shortcut.rs b/src/tuine/component/base/shortcut.rs
index 812a3d63..7300341f 100644
--- a/src/tuine/component/base/shortcut.rs
+++ b/src/tuine/component/base/shortcut.rs
@@ -8,8 +8,8 @@ use rustc_hash::FxHashMap;
 use tui::{backend::Backend, layout::Rect, Frame};
 
 use crate::tuine::{
-    Bounds, DrawContext, Event, Key, LayoutNode, Size, StateContext, StatefulComponent, Status,
-    TmpComponent,
+    Bounds, BuildContext, DrawContext, Event, Key, LayoutNode, Size, StateContext,
+    StatefulComponent, Status, TmpComponent,
 };
 
 const MAX_TIMEOUT: Duration = Duration::from_millis(400);
@@ -145,7 +145,7 @@ where
 
     type ComponentState = ShortcutState;
 
-    fn build(ctx: &mut crate::tuine::BuildContext<'_>, props: Self::Properties) -> Self {
+    fn build(ctx: &mut BuildContext<'_>, props: Self::Properties) -> Self {
         let (key, state) =
             ctx.register_and_mut_state::<_, Self::ComponentState>(Location::caller());
         let mut forest: FxHashMap<Vec<Event>, bool> = FxHashMap::default();
diff --git a/src/tuine/component/base/text_table/mod.rs b/src/tuine/component/base/text_table/mod.rs
index b29338e8..6b08c8d1 100644
--- a/src/tuine/component/base/text_table/mod.rs
+++ b/src/tuine/component/base/text_table/mod.rs
@@ -90,7 +90,7 @@ impl<Message> TextTable<Message> {
                     0
                 } else {
                     // +1 for the spacing
-                    width_remaining -= width + 1;
+                    width_remaining = width_remaining.saturating_sub(width + 1);
                     width
                 }
             })
@@ -372,7 +372,7 @@ impl<Message> TmpComponent<Message> for TextTable<Message> {
 #[cfg(test)]
 mod tests {
     use crate::tuine::{
-        text_table::SortType, StateMap, StatefulComponent, TextTableProps, BuildContext,
+        text_table::SortType, BuildContext, StateMap, StatefulComponent, TextTableProps,
     };
 
     use super::{DataRow, TextTable};
diff --git a/src/tuine/component/base/time_graph.rs b/src/tuine/component/base/time_graph.rs
index 6059dce7..9c899243 100644
--- a/src/tuine/component/base/time_graph.rs
+++ b/src/tuine/component/base/time_graph.rs
@@ -27,28 +27,3 @@ pub struct TimeGraph {
 }
 
 impl TimeGraph {}
-
-impl<Message> TmpComponent<Message> for TimeGraph {
-    fn draw<Backend>(
-        &mut self, state_ctx: &mut StateContext<'_>, draw_ctx: &DrawContext<'_>,
-        frame: &mut Frame<'_, Backend>,
-    ) where
-        Backend: tui::backend::Backend,
-    {
-        todo!()
-    }
-
-    fn on_event(
-        &mut self, state_ctx: &mut StateContext<'_>, draw_ctx: &DrawContext<'_>, event: Event,
-        messages: &mut Vec<Message>,
-    ) -> Status {
-        Status::Ignored
-    }
-
-    fn layout(&self, bounds: Bounds, node: &mut LayoutNode) -> crate::tuine::Size {
-        crate::tuine::Size {
-            width: bounds.max_width,
-            height: bounds.max_height,
-        }
-    }
-}
diff --git a/src/tuine/component/mod.rs b/src/tuine/component/mod.rs
index aaea0f32..b7a2224e 100644
--- a/src/tuine/component/mod.rs
+++ b/src/tuine/component/mod.rs
@@ -10,8 +10,7 @@ pub use stateful::*;
 pub mod banner;
 pub use banner::*;
 
-// pub mod stateless;
-// pub use stateless::*;
+
 
 use enum_dispatch::enum_dispatch;
 use tui::Frame;
diff --git a/src/tuine/context/context.rs b/src/tuine/context/context.rs
new file mode 100644
index 00000000..ea06ce18
--- /dev/null
+++ b/src/tuine/context/context.rs
@@ -0,0 +1,35 @@
+use gapbuffer::GapBuffer;
+
+use crate::tuine::{Key, KeyCreator, State};
+
+/// A [`Context`] is used to create a [`Component`](super::Component).
+///
+/// The internal implementation is based on Jetpack Compose's [Positional Memoization](https://medium.com/androiddevelopers/under-the-hood-of-jetpack-compose-part-2-of-2-37b2c20c6cdd),
+/// in addition to [Crochet](https://github.com/raphlinus/crochet/blob/master/src/tree.rs) in its entirety.
+pub struct Context {
+    component_key_creator: KeyCreator,
+    buffer: GapBuffer<Slot>,
+}
+
+enum Payload {
+    State(Box<dyn State>),
+    View,
+}
+
+struct Item {
+    key: Key,
+    payload: Payload,
+}
+
+enum Slot {
+    Begin(Item),
+    End,
+}
+
+impl Context {
+    pub fn use_state(&self) {}
+
+    pub fn start(&mut self) {}
+
+    pub fn end(&mut self) {}
+}
diff --git a/src/tuine/context/mod.rs b/src/tuine/context/mod.rs
index de4ee08e..904a52df 100644
--- a/src/tuine/context/mod.rs
+++ b/src/tuine/context/mod.rs
@@ -9,3 +9,6 @@ pub use build_context::BuildContext;
 
 pub mod state_context;
 pub use state_context::StateContext;
+
+pub mod context;
+pub use context::Context;
diff --git a/src/tuine/key.rs b/src/tuine/key.rs
index 05e70152..16f65980 100644
--- a/src/tuine/key.rs
+++ b/src/tuine/key.rs
@@ -30,3 +30,19 @@ impl Key {
         }
     }
 }
+
+#[derive(Default, Clone, Copy, Debug)]
+pub struct KeyCreator {
+    index: usize,
+}
+
+impl KeyCreator {
+    pub fn new_key(&mut self, caller: impl Into<Caller>) -> Key {
+        self.index += 1;
+        Key::new(caller, self.index)
+    }
+
+    pub fn reset(&mut self) {
+        self.index = 0;
+    }
+}
diff --git a/src/tuine/layout/size.rs b/src/tuine/layout/size.rs
index 74bbf4df..003ae8fe 100644
--- a/src/tuine/layout/size.rs
+++ b/src/tuine/layout/size.rs
@@ -4,7 +4,7 @@ use std::ops::{Add, AddAssign};
 ///
 /// A [`Size`] is sent from a child component back up to its parents after
 /// first being given a [`Bounds`](super::Bounds) from the parent.
-#[derive(Clone, Copy, Debug, Default)]
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
 pub struct Size {
     /// The width that the component has determined.
     pub width: u16,
diff --git a/src/tuine/mod.rs b/src/tuine/mod.rs
index f7ec3ede..111de69d 100644
--- a/src/tuine/mod.rs
+++ b/src/tuine/mod.rs
@@ -1,14 +1,22 @@
 //! tuine is a wrapper around tui-rs that expands on it with state management and
 //! event handling.
 //!
-//! tuine is inspired by a **ton** of other libraries and frameworks, like:
+//! tuine is inspired by a **ton** of other libraries and frameworks:
 //!
 //! - [Crochet](https://github.com/raphlinus/crochet)
+//! - [Dioxus](https://github.com/DioxusLabs/dioxus)
 //! - [Druid](https://github.com/linebender/druid)
 //! - [Flutter](https://flutter.dev/)
 //! - [Iced](https://github.com/iced-rs/iced)
+//! - [Jetpack Compose](https://developer.android.com/jetpack/compose)
 //! - [React](https://reactjs.org/)
 //! - [Yew](https://yew.rs/)
+//!
+//! In addition, Raph Levien's post,
+//! [*Towards principled reactive UI](https://raphlinus.github.io/rust/druid/2020/09/25/principled-reactive-ui.html),
+//! was a fantastic source of information for someone like me who had basically zero knowledge heading in.
+//!
+//! None of this would be possible without these as reference points and sources of inspiration and learning!
 
 mod tui_rs;
 
diff --git a/tests/invalid_config_tests.rs b/tests/invalid_config_tests.rs
index f8908b5c..5ce0f9b5 100644
--- a/tests/invalid_config_tests.rs
+++ b/tests/invalid_config_tests.rs
@@ -25,7 +25,7 @@ fn test_empty_layout() {
         .arg("./tests/invalid_configs/empty_layout.toml")
         .assert()
         .failure()
-        .stderr(predicate::str::contains("Configuration file error")); // FIXME: [Urgent] Use a const for the error pattern
+        .stderr(predicate::str::contains("cannot be empty")); // FIXME: [Urgent] Use a const for the error pattern
 }
 
 #[test]