feat: truncate long items in the file list (#2754)

Author: sxyazi

yazi-plugin/preset/components/current.lua

@@ -32,15 +32,16 @@ function Current:redraw()
 		return self:empty()
 	end
 
-	local entities, linemodes = {}, {}
+	local left, right = {}, {}
 	for _, f in ipairs(files) do
-		entities[#entities + 1] = Entity:new(f):redraw()
-		linemodes[#linemodes + 1] = Linemode:new(f):redraw()
+		left[#left + 1] = Entity:new(f):redraw()
+		right[#right + 1] = Linemode:new(f):redraw()
+		left[#left]:truncate { max = math.max(0, self._area.w - right[#right]:width()) }
 	end
 
 	return {
-		ui.List(entities):area(self._area),
-		ui.Text(linemodes):area(self._area):align(ui.Text.RIGHT),
+		ui.List(left):area(self._area),
+		ui.Text(right):area(self._area):align(ui.Text.RIGHT),
 	}
 end
 

yazi-plugin/preset/components/parent.lua

@@ -17,13 +17,13 @@ function Parent:redraw()
 		return {}
 	end
 
-	local entities = {}
+	local items = {}
 	for _, f in ipairs(self._folder.window) do
-		entities[#entities + 1] = Entity:new(f):redraw()
+		items[#items + 1] = Entity:new(f):redraw():truncate { max = self._area.w }
 	end
 
 	return {
-		ui.List(entities):area(self._area),
+		ui.List(items):area(self._area),
 	}
 end
 

yazi-plugin/preset/plugins/folder.lua

@@ -19,13 +19,13 @@ function M:peek(job)
 		return ya.preview_widget(job, ui.Line(s):area(job.area):align(ui.Line.CENTER))
 	end
 
-	local entities = {}
+	local items = {}
 	for _, f in ipairs(folder.window) do
-		entities[#entities + 1] = Entity:new(f):redraw()
+		items[#items + 1] = Entity:new(f):redraw():truncate { max = job.area.w }
 	end
 
 	ya.preview_widget(job, {
-		ui.List(entities):area(job.area),
+		ui.List(items):area(job.area),
 		table.unpack(Marker:new(job.area, folder):redraw()),
 	})
 end

yazi-plugin/src/elements/line.rs

@@ -1,4 +1,4 @@
-use std::mem;
+use std::{borrow::Cow, mem};
 
 use ansi_to_tui::IntoText;
 use mlua::{AnyUserData, ExternalError, ExternalResult, IntoLua, Lua, MetaMethod, Table, UserData, UserDataMethods, Value};
@@ -131,5 +131,30 @@ impl UserData for Line {
 		methods.add_method("visible", |_, me, ()| {
 			Ok(me.inner.iter().flat_map(|s| s.content.chars()).any(|c| c.width().unwrap_or(0) > 0))
 		});
+		methods.add_function_mut("truncate", |_, (ud, t): (AnyUserData, Table)| {
+			let mut me = ud.borrow_mut::<Self>()?;
+			let max = t.raw_get("max")?;
+
+			let mut width = 0;
+			'outer: for (x, span) in me.inner.iter_mut().enumerate() {
+				for (y, c) in span.content.char_indices() {
+					width += c.width().unwrap_or(0);
+					if width < max {
+						continue;
+					} else if width == max && span.content[y..].chars().nth(1).is_none() {
+						continue;
+					}
+
+					match &mut span.content {
+						Cow::Borrowed(s) => span.content = Cow::Borrowed(&s[..y]),
+						Cow::Owned(s) => s.truncate(y),
+					}
+					me.inner.spans.truncate(x + 1);
+					me.inner.spans.push(ratatui::text::Span::raw("…"));
+					break 'outer;
+				}
+			}
+			Ok(ud)
+		});
 	}
 }