Avoid cloning the whole paragraph content just for rendering (#9739)

* Avoid cloning the whole paragraph content just for rendering

* Fix tests

3 files changed, 21 insertions, 22 deletions

diff --git a/helix-tui/src/widgets/paragraph.rs b/helix-tui/src/widgets/paragraph.rs
index 4e839162..9c8ae127 100644
--- a/helix-tui/src/widgets/paragraph.rs
+++ b/helix-tui/src/widgets/paragraph.rs
@@ -28,15 +28,15 @@ fn get_line_offset(line_width: u16, text_area_width: u16, alignment: Alignment)
 /// # use helix_tui::widgets::{Block, Borders, Paragraph, Wrap};
 /// # use helix_tui::layout::{Alignment};
 /// # use helix_view::graphics::{Style, Color, Modifier};
-/// let text = vec![
+/// let text = Text::from(vec![
 ///     Spans::from(vec![
 ///         Span::raw("First"),
 ///         Span::styled("line",Style::default().add_modifier(Modifier::ITALIC)),
 ///         Span::raw("."),
 ///     ]),
 ///     Spans::from(Span::styled("Second line", Style::default().fg(Color::Red))),
-/// ];
-/// Paragraph::new(text)
+/// ]);
+/// Paragraph::new(&text)
 ///     .block(Block::default().title("Paragraph").borders(Borders::ALL))
 ///     .style(Style::default().fg(Color::White).bg(Color::Black))
 ///     .alignment(Alignment::Center)
@@ -51,7 +51,7 @@ pub struct Paragraph<'a> {
     /// How to wrap the text
     wrap: Option<Wrap>,
     /// The text to display
-    text: Text<'a>,
+    text: &'a Text<'a>,
     /// Scroll
     scroll: (u16, u16),
     /// Alignment of the text
@@ -70,7 +70,7 @@ pub struct Paragraph<'a> {
 ///     - Here is another point that is long enough to wrap"#);
 ///
 /// // With leading spaces trimmed (window width of 30 chars):
-/// Paragraph::new(bullet_points.clone()).wrap(Wrap { trim: true });
+/// Paragraph::new(&bullet_points).wrap(Wrap { trim: true });
 /// // Some indented points:
 /// // - First thing goes here and is
 /// // long so that it wraps
@@ -78,7 +78,7 @@ pub struct Paragraph<'a> {
 /// // is long enough to wrap
 ///
 /// // But without trimming, indentation is preserved:
-/// Paragraph::new(bullet_points).wrap(Wrap { trim: false });
+/// Paragraph::new(&bullet_points).wrap(Wrap { trim: false });
 /// // Some indented points:
 /// //     - First thing goes here
 /// // and is long so that it wraps
@@ -92,15 +92,12 @@ pub struct Wrap {
 }
 
 impl<'a> Paragraph<'a> {
-    pub fn new<T>(text: T) -> Paragraph<'a>
-    where
-        T: Into<Text<'a>>,
-    {
+    pub fn new(text: &'a Text) -> Paragraph<'a> {
         Paragraph {
             block: None,
             style: Default::default(),
             wrap: None,
-            text: text.into(),
+            text,
             scroll: (0, 0),
             alignment: Alignment::Left,
         }
diff --git a/helix-tui/tests/terminal.rs b/helix-tui/tests/terminal.rs
index 2824c9f2..d2d8ca10 100644
--- a/helix-tui/tests/terminal.rs
+++ b/helix-tui/tests/terminal.rs
@@ -17,14 +17,16 @@ fn terminal_buffer_size_should_not_be_limited() {
 //     let backend = TestBackend::new(10, 10);
 //     let mut terminal = Terminal::new(backend)?;
 //     let frame = terminal.draw(|f| {
-//         let paragraph = Paragraph::new("Test");
+//         let text = Text::from("Test");
+//         let paragraph = Paragraph::new(&text);
 //         f.render_widget(paragraph, f.size());
 //     })?;
 //     assert_eq!(frame.buffer.get(0, 0).symbol, "T");
 //     assert_eq!(frame.area, Rect::new(0, 0, 10, 10));
 //     terminal.backend_mut().resize(8, 8);
 //     let frame = terminal.draw(|f| {
-//         let paragraph = Paragraph::new("test");
+//         let text = Text::from("test");
+//         let paragraph = Paragraph::new(&text);
 //         f.render_widget(paragraph, f.size());
 //     })?;
 //     assert_eq!(frame.buffer.get(0, 0).symbol, "t");
diff --git a/helix-tui/tests/widgets_paragraph.rs b/helix-tui/tests/widgets_paragraph.rs
index a7c972eb..3d2ac467 100644
--- a/helix-tui/tests/widgets_paragraph.rs
+++ b/helix-tui/tests/widgets_paragraph.rs
@@ -21,8 +21,8 @@
 //         terminal
 //             .draw(|f| {
 //                 let size = f.size();
-//                 let text = vec![Spans::from(SAMPLE_STRING)];
-//                 let paragraph = Paragraph::new(text)
+//                 let text = Text::from(SAMPLE_STRING);
+//                 let paragraph = Paragraph::new(&text)
 //                     .block(Block::default().borders(Borders::ALL))
 //                     .alignment(alignment)
 //                     .wrap(Wrap { trim: true });
@@ -88,8 +88,8 @@
 //     terminal
 //         .draw(|f| {
 //             let size = f.size();
-//             let text = vec![Spans::from(s)];
-//             let paragraph = Paragraph::new(text)
+//             let text = Text::from(s);
+//             let paragraph = Paragraph::new(&text)
 //                 .block(Block::default().borders(Borders::ALL))
 //                 .wrap(Wrap { trim: true });
 //             f.render_widget(paragraph, size);
@@ -120,8 +120,8 @@
 //     terminal
 //         .draw(|f| {
 //             let size = f.size();
-//             let text = vec![Spans::from(s)];
-//             let paragraph = Paragraph::new(text)
+//             let text = Text::from(s);
+//             let paragraph = Paragraph::new(&text)
 //                 .block(Block::default().borders(Borders::ALL))
 //                 .wrap(Wrap { trim: true });
 //             f.render_widget(paragraph, size);
@@ -155,8 +155,8 @@
 //     terminal
 //         .draw(|f| {
 //             let size = f.size();
-
-//             let paragraph = Paragraph::new(line).block(Block::default().borders(Borders::ALL));
+//             let text = Text::from(line);
+//             let paragraph = Paragraph::new(&text).block(Block::default().borders(Borders::ALL));
 //             f.render_widget(paragraph, size);
 //         })
 //         .unwrap();
@@ -174,7 +174,7 @@
 //                 let text = Text::from(
 //                     "段落现在可以水平滚动了！\nParagraph can scroll horizontally!\nShort line",
 //                 );
-//                 let paragraph = Paragraph::new(text)
+//                 let paragraph = Paragraph::new(&text)
 //                     .block(Block::default().borders(Borders::ALL))
 //                     .alignment(alignment)
 //                     .scroll(scroll);