Enable plain clicks on transcript links and style bare URLs (#46884)

## Why

Transcript links required a modified click to open, and bare URLs lacked the visual styling of explicit Markdown links.

## What changed

- Open links on release after an unmodified, stationary left click. Cancel activation after dragging, scrolling, or releasing elsewhere so text selection remains usable.
- Apply Markdown link styling to bare URLs while preserving surrounding prose, existing emphasis, Unicode, and table wrapping.

## Testing

Add gesture tests for bare and Markdown links at narrow and wide widths, drag and scroll cancellation, and existing modified-click behavior. Add styling tests and snapshots covering punctuation, emphasis, tabs, Unicode, and wrapped table URLs.

GitOrigin-RevId: 23d12c901932d7e3586d841e5a0ece00e422fccd

codex-rs/tui/src/markdown_render.rs

@@ -47,7 +47,6 @@ use crate::render::line_utils::line_to_static;
 use crate::style::accent_color;
 use crate::style::table_separator_style;
 use crate::terminal_hyperlinks::HyperlinkLine;
-use crate::terminal_hyperlinks::annotate_web_urls_in_line;
 use crate::terminal_hyperlinks::remap_wrapped_line;
 use crate::terminal_hyperlinks::visible_lines;
 use crate::terminal_hyperlinks::web_destination;
@@ -87,6 +86,7 @@ use local_links::should_render_local_link_label;
 pub(crate) use streaming::StreamingMarkdownRender;
 pub(crate) use streaming::render_streaming_markdown_lines_with_width_and_cwd;
 pub(crate) use web_links::hide_web_link_destination;
+use web_links::style_bare_web_urls;
 
 const TABLE_COLUMN_GAP: usize = 2;
 const TABLE_CELL_PADDING: usize = 1;
@@ -1115,7 +1115,7 @@ where
         } else if self.link.is_some() || self.in_code_block {
             HyperlinkLine::new(Line::from(span))
         } else {
-            annotate_web_urls_in_line(Line::from(span))
+            style_bare_web_urls(span, self.styles.link)
         };
         if let Some(table_state) = self.table_state.as_mut()
             && let Some(cell) = table_state.current_cell.as_mut()
@@ -2123,7 +2123,7 @@ where
         } else if self.link.is_some() || self.in_code_block {
             HyperlinkLine::new(Line::from(span))
         } else {
-            annotate_web_urls_in_line(Line::from(span))
+            style_bare_web_urls(span, self.styles.link)
         };
         self.push_annotated(annotated);
     }

codex-rs/tui/src/markdown_render/snapshots/codex_tui__markdown_render__web_links__tests__bare_urls_are_styled_without_coloring_surrounding_prose.snap

@@ -0,0 +1,6 @@
+---
+source: tui/src/markdown_render/web_links_tests.rs
+assertion_line: 37
+expression: text
+---
+Text::from(Line::from_iter([Span::from("界 ("), Span::from("https://example.com/a").fg(Color::Reset).underlined(), Span::from("); "), Span::from("https://example.com/b").fg(Color::Reset).underlined(), Span::from("! "), Span::from("https://example.com/c").fg(Color::Reset).bold().underlined()]))

codex-rs/tui/src/markdown_render/snapshots/codex_tui__markdown_render__web_links__tests__bare_urls_keep_link_style_when_wrapped_in_tables.snap

@@ -0,0 +1,20 @@
+---
+source: tui/src/markdown_render/web_links_tests.rs
+assertion_line: 63
+expression: text
+---
+Text::from_iter([
+    Line::from_iter([
+        Span::from(" "),
+        Span::from("Resource"),
+    ]).fg(Color::Rgb(249, 226, 175)).bold(),
+    Line::from(Span::from("━━━━━━━━━━━━━━━━━━━━").dim()),
+    Line::from_iter([
+        Span::from(" "),
+        Span::from("https://").fg(Color::Reset).underlined(),
+    ]),
+    Line::from_iter([
+        Span::from(" "),
+        Span::from("example.com/docs").fg(Color::Reset).underlined(),
+    ]),
+])

codex-rs/tui/src/markdown_render/web_links.rs

@@ -1,4 +1,4 @@
-//! Presentation policy for web-link destinations in semantic Markdown output.
+//! Styling and destination visibility for web links in semantic Markdown output.
 //!
 //! Terminal identity is a conservative heuristic, not end-to-end capability negotiation. Unknown
 //! terminals and multiplexers retain the destination so a label never hides the only usable URL.
@@ -9,7 +9,50 @@ use codex_terminal_detection::terminal_info;
 use std::io::IsTerminal;
 use std::sync::LazyLock;
 
+use ratatui::style::Style;
+use ratatui::text::Line;
+use ratatui::text::Span;
+use unicode_segmentation::UnicodeSegmentation;
+
+use crate::terminal_hyperlinks::HyperlinkLine;
+use crate::terminal_hyperlinks::annotate_web_urls_in_line;
 use crate::terminal_hyperlinks::web_destination;
+use crate::width::display_width;
+
+/// Give detected URLs the same affordance as explicit Markdown links, preserving surrounding text.
+pub(super) fn style_bare_web_urls(span: Span<'static>, link_style: Style) -> HyperlinkLine {
+    let mut line = annotate_web_urls_in_line(Line::from(span));
+    if line.hyperlinks.is_empty() {
+        return line;
+    }
+    let mut spans: Vec<Span<'static>> = Vec::new();
+    let mut links = line.hyperlinks.iter().peekable();
+    let mut column = 0;
+    let span = &line.line.spans[0];
+    for grapheme in span.content.graphemes(/*is_extended*/ true) {
+        while links.peek().is_some_and(|link| link.columns.end <= column) {
+            links.next();
+        }
+        let style = if links
+            .peek()
+            .is_some_and(|link| link.columns.contains(&column))
+        {
+            span.style.patch(link_style)
+        } else {
+            span.style
+        };
+        if let Some(last) = spans.last_mut()
+            && last.style == style
+        {
+            last.content.to_mut().push_str(grapheme);
+        } else {
+            spans.push(Span::styled(grapheme.to_owned(), style));
+        }
+        column += display_width(grapheme);
+    }
+    line.line.spans = spans;
+    line
+}
 
 #[derive(Clone, Copy, PartialEq, Eq)]
 enum WebLinkDisplay {

codex-rs/tui/src/markdown_render/web_links_tests.rs

@@ -10,11 +10,62 @@ use codex_terminal_detection::TerminalInfo;
 use codex_terminal_detection::TerminalName;
 use insta::assert_debug_snapshot;
 use pretty_assertions::assert_eq;
+use ratatui::style::Style;
 use ratatui::style::Stylize;
 use ratatui::text::Line;
 use ratatui::text::Text;
 use std::collections::BTreeSet;
 
+#[test]
+fn bare_urls_are_styled_without_coloring_surrounding_prose() {
+    let text = Text::from(visible_lines(render(
+        "界 (https://example.com/a); https://example.com/b! **https://example.com/c**",
+        /*width*/ 100,
+        WebLinkDisplay::LabelOnly,
+    )));
+    assert_eq!(
+        text,
+        Text::from(Line::from(vec![
+            "界 (".into(),
+            "https://example.com/a".fg(accent_color()).underlined(),
+            "); ".into(),
+            "https://example.com/b".fg(accent_color()).underlined(),
+            "! ".into(),
+            "https://example.com/c"
+                .bold()
+                .fg(accent_color())
+                .underlined(),
+        ])),
+    );
+    assert_debug_snapshot!(text);
+}
+
+#[test]
+fn bare_url_styling_preserves_tabs_and_unicode() {
+    let line = super::style_bare_web_urls(
+        "界\t(https://example.com).".bold(),
+        Style::new().fg(accent_color()).underlined(),
+    );
+    assert_eq!(
+        line.line,
+        Line::from(vec![
+            "界\t(".bold(),
+            "https://example.com".bold().fg(accent_color()).underlined(),
+            ").".bold(),
+        ]),
+    );
+}
+
+#[test]
+fn bare_urls_keep_link_style_when_wrapped_in_tables() {
+    let text = Text::from(visible_lines(render(
+        "| Resource |\n| --- |\n| https://example.com/docs |",
+        /*width*/ 20,
+        WebLinkDisplay::LabelOnly,
+    )));
+    assert_debug_snapshot!(text);
+}
+
 fn terminal(name: TerminalName) -> TerminalInfo {
     TerminalInfo {
         name,

codex-rs/tui/src/transcript_view/input.rs

@@ -1,4 +1,5 @@
 //! Transcript gestures leave ordinary typing and composer editing with the existing input path.
+//! Stationary link clicks open on release; dragging or scrolling keeps the gesture in selection.
 
 use crate::key_hint::KeyBindingListExt;
 use crossterm::event::KeyCode;
@@ -206,6 +207,27 @@ impl TranscriptView {
                 self.extend_selection(event.column, event.row);
             }
             MouseEventKind::Up(MouseButton::Left) if dragging => {
+                // Open only a stationary click. Dragging back to the origin is still selection,
+                // and wheel scrolling clears the pointer even when it cannot move the viewport.
+                let link = self.selection.as_mut().and_then(|selection| {
+                    (inside
+                        && !selection.moved
+                        && selection.pointer == Some(ScreenPosition::new(event.column, event.row))
+                        && event.modifiers.is_empty())
+                    .then(|| selection.pressed_link.take())
+                    .flatten()
+                });
+                let link = link.filter(|destination| {
+                    self.visible
+                        .get(usize::from(event.row - self.area.y))
+                        .and_then(|visible| {
+                            visible
+                                .layout
+                                .link_at(visible.row, event.column - self.area.x)
+                        })
+                        .as_ref()
+                        == Some(destination)
+                });
                 if self
                     .selection
                     .as_ref()
@@ -217,6 +239,9 @@ impl TranscriptView {
                 if self.selected_text(cells).is_none() {
                     self.end_selection(cells);
                 }
+                if let Some(link) = link {
+                    return Some(ViewAction::OpenLink(link));
+                }
             }
             _ => return None,
         }
@@ -317,7 +342,21 @@ impl TranscriptView {
         {
             return None;
         }
+        let link = (clicks == 1 && event.modifiers.is_empty())
+            .then(|| {
+                visible
+                    .layout
+                    .link_at(visible.row, event.column.saturating_sub(self.area.x))
+            })
+            .flatten();
         self.begin_selection(cells, event.column, event.row, clicks);
+        if let Some(selection) = &mut self.selection {
+            selection.pressed_link = link;
+        }
         Some(ViewAction::Changed)
     }
 }
+
+#[cfg(test)]
+#[path = "input_tests.rs"]
+mod tests;

codex-rs/tui/src/transcript_view/input_tests.rs

@@ -0,0 +1,173 @@
+//! Link activation shares pointer gestures with selection without opening after a drag or scroll.
+
+use super::*;
+use crate::history_cell::AgentMarkdownCell;
+use pretty_assertions::assert_eq;
+
+fn transcript(markdown: &str, width: u16) -> (TranscriptView, Vec<Arc<dyn HistoryCell>>) {
+    let cells: Vec<Arc<dyn HistoryCell>> = vec![Arc::new(AgentMarkdownCell::new(
+        markdown.into(),
+        std::path::Path::new("/"),
+    ))];
+    let mut view = TranscriptView::default();
+    let area = Rect::new(/*x*/ 2, /*y*/ 1, width, /*height*/ 8);
+    view.render(area, &mut Buffer::empty(area), &cells);
+    (view, cells)
+}
+
+fn mouse(kind: MouseEventKind, column: u16, row: u16) -> MouseEvent {
+    MouseEvent {
+        kind,
+        column,
+        row,
+        modifiers: KeyModifiers::NONE,
+    }
+}
+
+#[test]
+fn ordinary_click_opens_bare_and_markdown_links_on_release() {
+    for markdown in [
+        "https://example.com/docs",
+        "[docs](https://example.com/docs)",
+    ] {
+        for width in [12, 60] {
+            let (mut view, cells) = transcript(markdown, width);
+            let down = mouse(
+                MouseEventKind::Down(MouseButton::Left),
+                /*column*/ 4,
+                /*row*/ 1,
+            );
+            assert!(matches!(
+                view.handle_mouse(down, &cells),
+                Some(ViewAction::Changed)
+            ));
+            // Match the app's redraw before dispatching the next mouse event.
+            let area = view.area;
+            view.render(area, &mut Buffer::empty(area), &cells);
+            let up = MouseEvent {
+                kind: MouseEventKind::Up(MouseButton::Left),
+                ..down
+            };
+            let Some(ViewAction::OpenLink(url)) = view.handle_mouse(up, &cells) else {
+                panic!("click should open {markdown}");
+            };
+            assert_eq!(
+                (
+                    url.as_str(),
+                    view.selected_text(&cells),
+                    view.is_following()
+                ),
+                ("https://example.com/docs", None, true)
+            );
+            assert!(view.handle_mouse(up, &cells).is_none());
+        }
+    }
+}
+
+#[test]
+fn dragging_a_link_selects_text_and_never_opens_it() {
+    for return_to_origin in [false, true] {
+        let (mut view, cells) = transcript(
+            "[documentation](https://example.com/docs)",
+            /*width*/ 60,
+        );
+        view.handle_mouse(
+            mouse(
+                MouseEventKind::Down(MouseButton::Left),
+                /*column*/ 4,
+                /*row*/ 1,
+            ),
+            &cells,
+        );
+        view.handle_mouse(
+            mouse(
+                MouseEventKind::Drag(MouseButton::Left),
+                /*column*/ 7,
+                /*row*/ 1,
+            ),
+            &cells,
+        );
+        assert_eq!(view.selected_text(&cells).as_deref(), Some("doc"));
+        let column = if return_to_origin { 4 } else { 7 };
+        let action = view.handle_mouse(
+            mouse(
+                MouseEventKind::Up(MouseButton::Left),
+                column,
+                /*row*/ 1,
+            ),
+            &cells,
+        );
+        assert!(matches!(action, Some(ViewAction::Changed)));
+        assert_eq!(
+            view.selected_text(&cells).as_deref(),
+            (!return_to_origin).then_some("doc")
+        );
+    }
+}
+
+#[test]
+fn scrolling_or_releasing_elsewhere_cancels_link_activation() {
+    for interruption in [
+        mouse(MouseEventKind::ScrollUp, /*column*/ 4, /*row*/ 1),
+        mouse(
+            MouseEventKind::ScrollDown,
+            /*column*/ 4,
+            /*row*/ 1,
+        ),
+        mouse(
+            MouseEventKind::Up(MouseButton::Left),
+            /*column*/ 5,
+            /*row*/ 1,
+        ),
+        mouse(
+            MouseEventKind::Up(MouseButton::Left),
+            /*column*/ 0,
+            /*row*/ 0,
+        ),
+    ] {
+        let (mut view, cells) = transcript("[docs](https://example.com/docs)", /*width*/ 60);
+        view.handle_mouse(
+            mouse(
+                MouseEventKind::Down(MouseButton::Left),
+                /*column*/ 4,
+                /*row*/ 1,
+            ),
+            &cells,
+        );
+        assert!(!matches!(
+            view.handle_mouse(interruption, &cells),
+            Some(ViewAction::OpenLink(_))
+        ));
+        assert!(!matches!(
+            view.handle_mouse(
+                mouse(
+                    MouseEventKind::Up(MouseButton::Left),
+                    /*column*/ 4,
+                    /*row*/ 1
+                ),
+                &cells
+            ),
+            Some(ViewAction::OpenLink(_))
+        ));
+    }
+}
+
+#[test]
+fn modified_clicks_still_open_immediately() {
+    for modifiers in [KeyModifiers::CONTROL, KeyModifiers::SUPER] {
+        let (mut view, cells) = transcript("[docs](https://example.com/docs)", /*width*/ 60);
+        let event = MouseEvent {
+            modifiers,
+            ..mouse(
+                MouseEventKind::Down(MouseButton::Left),
+                /*column*/ 4,
+                /*row*/ 1,
+            )
+        };
+        let Some(ViewAction::OpenLink(url)) = view.handle_mouse(event, &cells) else {
+            panic!("modified click should open link");
+        };
+        assert_eq!(url, "https://example.com/docs");
+        assert!(view.selection.is_none());
+    }
+}

codex-rs/tui/src/transcript_view/selection.rs

@@ -16,6 +16,7 @@ pub(super) struct Selection {
     pub(super) moved: bool,
     pub(super) resume_on_empty: bool,
     pub(super) pointer: Option<ScreenPosition>,
+    pub(super) pressed_link: Option<String>,
     origin: (Anchor, Anchor),
     unit: SelectionUnit,
     preferred_column: Option<u16>,
@@ -57,6 +58,7 @@ impl TranscriptView {
             moved: false,
             resume_on_empty: was_following,
             pointer: Some(ScreenPosition::new(column, row)),
+            pressed_link: None,
         });
         if was_following {
             self.hold_position();