Files: a tile's name keeps its ends; the ellipses share one line cutter

gpui's line_clamp wraps once and lays the rest of a long name on the
second line, which a centered tile then clipped at both ends. A tile's
name is now one line, cut in the middle so the front and the extension
stay. MiddleEllipsis draws like Ellipsis: in the text style around it,
sized by its text, so a short name centers; the two share one cutter.

AGENTS.md

@@ -110,6 +110,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - Ids inside a reusable component carry its owner's id or `EntityId`, animation ids too. Twin ids share focus, click and animation state.
 - Text wraps at the width its box had when measured. A cross-axis `max_w` comes too late, and a flex column counts wrapped text as one line. Put prose in a plain block inside a flex row with `flex_1().max_w(..)` (`feedback::states`).
 - gpui 0.2.2 keeps a no-wrap line's first measure, taken at full width inside flex and scroll boxes, so `.truncate()` clips there instead of ending in an ellipsis. A line that may overflow is a `typography::Ellipsis`.
+- gpui 0.2.2's `line_clamp` wraps once and lays the rest on the last line, cut hard; centered, it loses both ends. A name whose ends matter is a `typography::MiddleEllipsis` on one line (`files::FileGrid`).
 - Set an explicit line height on any box that clips text. gpui's default leading is taller than a tight box, and the clip eats descenders.
 - gpui's `img` takes its picture's pixel size for any `Auto` side, and its aspect ratio beats percent heights in flow. `Image` pins it absolute at full size, so an `Image` needs a sized box.
 - A file's icon comes from `primitives::file_icon`, one map from name to icon for every chapter; `files::FileIcon` draws it. What fits across a width comes from `layout::columns_for`, and `layout::fit` adds the inset that centers it.

TASKS.md

@@ -321,3 +321,4 @@ Per-component lines live in `tasks/`. Tags there:
 | T26d | 2 | PASS | |
 | T26e | 1 | FAIL | an option list had no width limit, so a long device name ran it past the window |
 | T26e | 2 | PASS | |
+| T27a | 1 | FAIL | a tile's long name leaned on gpui's line_clamp, which cut its second line at both ends and lost the extension |

examples/gallery/pages/files/mod.rs

@@ -44,6 +44,11 @@ fn entries() -> Vec<DirEntry> {
         DirEntry::file("Walkthrough.mov", 184_000_000, ago(120)),
         DirEntry::file("main.rs", 9_200, ago(1)),
         DirEntry::file("Archive.zip", 48_000_000, ago(700)),
+        DirEntry::file(
+            "Quarterly review with the design team, final.pdf",
+            820_000,
+            ago(6),
+        ),
     ]
 }
 

src/files/grid.rs

@@ -13,7 +13,7 @@ use crate::{
     lists::DirEntry,
     primitives::{FocusRing, tab_stop},
     theme::{ActiveTheme, IconSize, Radius, TextSize},
-    typography::LEADING,
+    typography::{LEADING, MiddleEllipsis},
 };
 
 type OnEntry = Rc<dyn Fn(&DirEntry, &mut Window, &mut App)>;
@@ -157,13 +157,14 @@ impl RenderOnce for FileGrid {
                 .child(FileIcon::entry(entry).size(IconSize::Xxl))
                 .child(
                     div()
+                        .debug_selector(|| format!("file-name {ix}"))
                         .w_full()
-                        .text_center()
+                        .flex()
+                        .justify_center()
                         .text_size(theme.text_size(TextSize::Sm))
                         .line_height(relative(LEADING))
                         .text_color(colors.fg)
-                        .line_clamp(2)
-                        .child(entry.name().clone()),
+                        .child(MiddleEllipsis::new(entry.name().clone())),
                 )
                 .on_click(move |event, window, cx| {
                     pick(ix, window, cx);

src/files/tests.rs

@@ -156,3 +156,31 @@ fn a_name_is_listed_once() {
 fn the_pick_is_one_of_the_entries() {
     let _ = FileGrid::new("grid", [DirEntry::file("a", 1, then())]).selected("z");
 }
+
+/// One tile whose name runs long.
+struct Named;
+
+impl Render for Named {
+    fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {
+        let name = "A very long file name that keeps going past two whole lines.pdf";
+        div()
+            .w(px(280.0))
+            .child(FileGrid::new("grid", [DirEntry::file(name, 10, then())]))
+    }
+}
+
+#[gpui::test]
+fn a_long_name_takes_one_line_inside_its_tile(cx: &mut TestAppContext) {
+    setup(cx);
+    let (_, cx) = cx.add_window_view(|_, _| Named);
+    settle(cx);
+    let (name, grid) = (
+        cx.debug_bounds("file-name 0").expect("the name draws"),
+        cx.debug_bounds("file-grid").expect("the grid draws"),
+    );
+    assert!(name.size.height < px(24.0), "one line: {name:?}");
+    assert!(
+        name.left() >= grid.left() && name.right() <= grid.right(),
+        "{name:?} in {grid:?}"
+    );
+}

src/typography/fit.rs

@@ -1,7 +1,7 @@
 use gpui::{
-    App, ElementId, InteractiveElement, IntoElement, ParentElement, Pixels, RenderOnce, ShapedLine,
-    SharedString, StatefulInteractiveElement, Styled, TextRun, Window, canvas, div, prelude::*,
-    relative, transparent_black,
+    App, Div, ElementId, InteractiveElement, IntoElement, ParentElement, Pixels, RenderOnce,
+    ShapedLine, SharedString, StatefulInteractiveElement, Styled, TextRun, Window, canvas, div,
+    prelude::*, relative, transparent_black,
 };
 
 use crate::{
@@ -108,7 +108,33 @@ fn fit_end(text: &str, width: Pixels, window: &mut Window) -> String {
     cut(low)
 }
 
-/// One line in the text style around it, cut at the end with an ellipsis when its box is too narrow. gpui 0.2.2 keeps a line's first measure, so its own `truncate` clips instead in flex boxes.
+/// One line in the text style around it, cut by `fit` to its box. gpui 0.2.2 keeps a line's first measure, so its own `truncate` clips instead in flex boxes.
+fn cut_line(text: SharedString, fit: fn(&str, Pixels, &mut Window) -> String) -> Div {
+    let line = text.clone();
+    div()
+        .relative()
+        .min_w_0()
+        .overflow_hidden()
+        .whitespace_nowrap()
+        .child(div().text_color(transparent_black()).child(text))
+        .child(
+            canvas(
+                move |bounds, window, _| shape(&fit(&line, bounds.size.width, window), window),
+                |bounds, shaped, window, cx| {
+                    let line = window.text_style().line_height_in_pixels(window.rem_size());
+                    shaped
+                        .paint(bounds.origin, line, window, cx)
+                        .expect("a cut line paints");
+                },
+            )
+            .absolute()
+            .top_0()
+            .left_0()
+            .size_full(),
+        )
+}
+
+/// One line in the text style around it, cut at the end with an ellipsis when its box is too narrow.
 #[derive(IntoElement)]
 pub struct Ellipsis {
     text: SharedString,
@@ -122,34 +148,11 @@ impl Ellipsis {
 
 impl RenderOnce for Ellipsis {
     fn render(self, _: &mut Window, _: &mut App) -> impl IntoElement {
-        let text = self.text.clone();
-        div()
-            .relative()
-            .min_w_0()
-            .overflow_hidden()
-            .whitespace_nowrap()
-            .child(div().text_color(transparent_black()).child(self.text))
-            .child(
-                canvas(
-                    move |bounds, window, _| {
-                        shape(&fit_end(&text, bounds.size.width, window), window)
-                    },
-                    |bounds, shaped, window, cx| {
-                        let line = window.text_style().line_height_in_pixels(window.rem_size());
-                        shaped
-                            .paint(bounds.origin, line, window, cx)
-                            .expect("an ellipsis line paints");
-                    },
-                )
-                .absolute()
-                .top_0()
-                .left_0()
-                .size_full(),
-            )
+        cut_line(self.text, fit_end)
     }
 }
 
-/// Shortens in the middle, keeping both ends. Paths, hashes.
+/// One line in the text style around it, cut in the middle when its box is too narrow, so both ends stay: paths, file names, hashes.
 #[derive(IntoElement)]
 pub struct MiddleEllipsis {
     text: SharedString,
@@ -162,31 +165,8 @@ impl MiddleEllipsis {
 }
 
 impl RenderOnce for MiddleEllipsis {
-    fn render(self, window: &mut Window, cx: &mut App) -> impl IntoElement {
-        let theme = cx.theme();
-        let size = theme.text_size(TextSize::Base);
-        let line = size.to_pixels(window.rem_size()) * LEADING;
-        let text = self.text;
-        div()
-            .w_full()
-            .h(line)
-            .overflow_hidden()
-            .text_size(size)
-            .text_color(theme.colors.fg)
-            .child(
-                canvas(
-                    move |bounds, window, _| {
-                        let shown = fit_middle(&text, bounds.size.width, window);
-                        shape(&shown, window)
-                    },
-                    move |bounds, shaped, window, cx| {
-                        shaped
-                            .paint(bounds.origin, line, window, cx)
-                            .expect("middle ellipsis failed to paint");
-                    },
-                )
-                .size_full(),
-            )
+    fn render(self, _: &mut Window, _: &mut App) -> impl IntoElement {
+        cut_line(self.text, fit_middle)
     }
 }
 
@@ -268,7 +248,19 @@ mod tests {
 mod fits {
     use gpui::{Pixels, TestAppContext};
 
-    use super::{fit_end, width_of};
+    use super::{fit_end, fit_middle, width_of};
+
+    #[gpui::test]
+    fn a_middle_cut_keeps_the_front_and_the_extension(cx: &mut TestAppContext) {
+        let cx = cx.add_empty_window();
+        cx.update(|window, _| {
+            let text = "A very long file name that keeps going.pdf";
+            let room = width_of("A very long…going.pdf", window);
+            let cut = fit_middle(text, room, window);
+            assert!(cut.starts_with("A very") && cut.ends_with(".pdf"), "{cut}");
+            assert!(width_of(&cut, window) <= room && cut.contains('…'), "{cut}");
+        });
+    }
 
     #[gpui::test]
     fn an_ellipsis_keeps_the_longest_front_that_fits(cx: &mut TestAppContext) {