feat(no_std): remove redundant std usages in ratatui-widgets (#1762)

Cargo.lock

@@ -2660,6 +2660,7 @@ dependencies = [
  "color-eyre",
  "crossterm",
  "document-features",
+ "hashbrown",
  "indoc",
  "instability",
  "itertools 0.13.0",

Cargo.toml

@@ -31,6 +31,7 @@ bitflags = "2.9.0"
 color-eyre = "0.6.3"
 crossterm = "0.28.1"
 document-features = "0.2.11"
+hashbrown = "0.15.2"
 indoc = "2.0.6"
 instability = "0.3.7"
 itertools = "0.13.0"

ratatui-widgets/Cargo.toml

@@ -50,6 +50,7 @@ unstable-rendered-line-info = []
 bitflags.workspace = true
 crossterm.workspace = true
 document-features = { workspace = true, optional = true }
+hashbrown.workspace = true
 indoc.workspace = true
 instability.workspace = true
 itertools.workspace = true

ratatui-widgets/examples/barchart-grouped.rs

@@ -14,7 +14,7 @@
 //! [widget examples]: https://github.com/ratatui/ratatui/blob/main/ratatui-widgets/examples
 //! [examples readme]: https://github.com/ratatui/ratatui/blob/main/examples/README.md
 
-use std::iter::zip;
+use core::iter::zip;
 
 use color_eyre::Result;
 use crossterm::event::{self, Event};

ratatui-widgets/examples/line_gauge.rs

@@ -14,7 +14,7 @@
 //! [widget examples]: https://github.com/ratatui/ratatui/blob/main/ratatui-widgets/examples
 //! [examples readme]: https://github.com/ratatui/ratatui/blob/main/examples/README.md
 
-use std::time::Duration;
+use core::time::Duration;
 
 use color_eyre::Result;
 use crossterm::event::{self, Event, KeyCode, KeyEventKind};

ratatui-widgets/examples/sparkline.rs

@@ -14,7 +14,7 @@
 //! [widget examples]: https://github.com/ratatui/ratatui/blob/main/ratatui-widgets/examples
 //! [examples readme]: https://github.com/ratatui/ratatui/blob/main/examples/README.md
 
-use std::time::Duration;
+use core::time::Duration;
 
 use color_eyre::Result;
 use crossterm::event::{self, Event};

ratatui-widgets/src/borders.rs

@@ -1,5 +1,5 @@
 //! Border related types ([`Borders`], [`BorderType`]) and a macro to create borders ([`border`]).
-use std::fmt;
+use core::fmt;
 
 use bitflags::bitflags;
 use ratatui_core::symbols::border;

ratatui-widgets/src/calendar.rs

@@ -8,8 +8,7 @@
 //! * a style is returned by the [`DateStyler`] for the day
 //!
 //! [`Monthly`] has several controls for what should be displayed
-use std::collections::HashMap;
-
+use hashbrown::HashMap;
 use ratatui_core::buffer::Buffer;
 use ratatui_core::layout::{Alignment, Constraint, Layout, Rect};
 use ratatui_core::style::Style;

ratatui-widgets/src/canvas.rs

@@ -13,8 +13,8 @@
 //!
 //! You can also implement your own custom [`Shape`]s.
 
-use std::fmt;
-use std::iter::zip;
+use core::fmt;
+use core::iter::zip;
 
 use itertools::Itertools;
 use ratatui_core::buffer::Buffer;

ratatui-widgets/src/chart.rs

@@ -1,6 +1,6 @@
 //! The [`Chart`] widget is used to plot one or more [`Dataset`] in a cartesian coordinate system.
-use std::cmp::max;
-use std::ops::Not;
+use core::cmp::max;
+use core::ops::Not;
 
 use ratatui_core::buffer::Buffer;
 use ratatui_core::layout::{Alignment, Constraint, Flex, Layout, Position, Rect};

ratatui-widgets/src/lib.rs

@@ -79,6 +79,9 @@
 //! # License
 //!
 //! This project is licensed under the MIT License. See the [LICENSE](../LICENSE) file for details.
+
+extern crate alloc;
+
 pub mod barchart;
 pub mod block;
 pub mod borders;

ratatui-widgets/src/list/item.rs

@@ -218,7 +218,7 @@ where
 
 #[cfg(test)]
 mod tests {
-    use std::borrow::Cow;
+    use alloc::borrow::Cow;
 
     use pretty_assertions::assert_eq;
     use ratatui_core::style::{Color, Modifier, Stylize};

ratatui-widgets/src/reflow.rs

@@ -1,6 +1,6 @@
 //! Internal module for reflowing text to fit into a certain width.
-use std::collections::VecDeque;
-use std::mem;
+use alloc::collections::VecDeque;
+use core::mem;
 
 use ratatui_core::layout::Alignment;
 use ratatui_core::text::StyledGrapheme;

ratatui-widgets/src/scrollbar.rs

@@ -7,7 +7,7 @@
     clippy::module_name_repetitions
 )]
 
-use std::iter;
+use core::iter;
 
 use ratatui_core::buffer::Buffer;
 use ratatui_core::layout::Rect;
@@ -636,7 +636,7 @@ impl ScrollbarOrientation {
 
 #[cfg(test)]
 mod tests {
-    use std::str::FromStr;
+    use core::str::FromStr;
 
     use ratatui_core::text::Text;
     use ratatui_core::widgets::Widget;

ratatui-widgets/src/sparkline.rs

@@ -1,5 +1,5 @@
 //! The [`Sparkline`] widget is used to display a sparkline over one or more lines.
-use std::cmp::min;
+use core::cmp::min;
 
 use ratatui_core::buffer::Buffer;
 use ratatui_core::layout::Rect;

ratatui-widgets/src/table.rs

@@ -1036,7 +1036,7 @@ where
 
 #[cfg(test)]
 mod tests {
-    use std::vec;
+    use alloc::vec;
 
     use ratatui_core::layout::Constraint::*;
     use ratatui_core::style::{Color, Modifier, Style, Stylize};

ratatui-widgets/src/table/row.rs

@@ -272,7 +272,7 @@ where
 
 #[cfg(test)]
 mod tests {
-    use std::vec;
+    use alloc::vec;
 
     use ratatui_core::style::{Color, Modifier, Stylize};