feat: add file(1) as the file fallback previewer (#543)

yazi-config/preset/yazi.toml

@@ -115,6 +115,8 @@ previewers = [
 	{ mime = "application/x-7z-compressed", exec = "archive" },
 	{ mime = "application/x-rar",           exec = "archive" },
 	{ mime = "application/xz",              exec = "archive" },
+	# Fallback
+	{ name = "*", exec = "file" },
 ]
 
 [input]

yazi-fm/src/which/layout.rs

@@ -25,13 +25,9 @@ impl Widget for Which<'_> {
 			}
 		}
 
-		let height = cands.0.len() as u16 + 2;
-		let area = Rect {
-			x: 1,
-			y: area.height.saturating_sub(height + 2),
-			width: area.width.saturating_sub(2),
-			height,
-		};
+		let height = area.height.min(cands.0.len() as u16 + 2);
+		let y = area.height.saturating_sub(height + 2);
+		let area = Rect { x: area.width.min(1), y, width: area.width.saturating_sub(2), height };
 
 		let chunks = layout::Layout::new(Direction::Horizontal, [
 			Constraint::Ratio(1, 3),

yazi-plugin/preset/plugins/file.lua

@@ -0,0 +1,28 @@
+local M = {}
+
+function M:peek()
+	local output, code = Command("file")
+		:args({
+			"-bL",
+			tostring(self.file.url),
+		})
+		:stdout(Command.PIPED)
+		:output()
+
+	local p
+	if output then
+		p = ui.Paragraph.parse(self.area, "----- File Type Classification -----\n\n" .. output.stdout)
+	else
+		p = ui.Paragraph(self.area, {
+			ui.Line {
+				ui.Span("Failed to spawn `file` command, error code: " .. tostring(code)),
+			},
+		})
+	end
+
+	ya.preview_widgets(self, { p:wrap(ui.Paragraph.WRAP) })
+end
+
+function M:seek() end
+
+return M

yazi-plugin/src/elements/paragraph.rs

@@ -4,10 +4,16 @@ use ratatui::widgets::Widget;
 
 use super::{Line, RectRef, Renderable, Style};
 
+// Alignment
 const LEFT: u8 = 0;
 const CENTER: u8 = 1;
 const RIGHT: u8 = 2;
 
+// Wrap
+const WRAP_NO: u8 = 0;
+const WRAP: u8 = 1;
+const WRAP_TRIM: u8 = 2;
+
 #[derive(Clone, Debug, Default)]
 pub struct Paragraph {
 	pub area: ratatui::layout::Rect,
@@ -15,6 +21,7 @@ pub struct Paragraph {
 	pub text:      ratatui::text::Text<'static>,
 	pub style:     Option<ratatui::style::Style>,
 	pub alignment: ratatui::layout::Alignment,
+	pub wrap:      u8,
 }
 
 impl Paragraph {
@@ -37,6 +44,10 @@ impl Paragraph {
 			("LEFT", LEFT.into_lua(lua)?),
 			("CENTER", CENTER.into_lua(lua)?),
 			("RIGHT", RIGHT.into_lua(lua)?),
+			// Wrap
+			("WRAP_OFF", WRAP_NO.into_lua(lua)?),
+			("WRAP", WRAP.into_lua(lua)?),
+			("WRAP_TRIM", WRAP_TRIM.into_lua(lua)?),
 		])?;
 
 		paragraph.set_metatable(Some(lua.create_table_from([("__call", new)])?));
@@ -67,6 +78,13 @@ impl UserData for Paragraph {
 			};
 			Ok(ud)
 		});
+		methods.add_function("wrap", |_, (ud, wrap): (AnyUserData, u8)| {
+			ud.borrow_mut::<Self>()?.wrap = match wrap {
+				w @ (WRAP | WRAP_TRIM | WRAP_NO) => w,
+				_ => return Err("expected a WRAP or WRAP_TRIM or WRAP_OFF".into_lua_err()),
+			};
+			Ok(ud)
+		});
 	}
 }
 
@@ -79,8 +97,11 @@ impl Renderable for Paragraph {
 			p = p.style(style);
 		}
 
-		p = p.alignment(self.alignment);
-		p.render(self.area, buf)
+		if self.wrap != WRAP_NO {
+			p = p.wrap(ratatui::widgets::Wrap { trim: self.wrap == WRAP_TRIM });
+		}
+
+		p.alignment(self.alignment).render(self.area, buf);
 	}
 
 	fn clone_render(&self, buf: &mut ratatui::buffer::Buffer) { Box::new(self.clone()).render(buf) }

yazi-plugin/src/loader.rs

@@ -25,13 +25,14 @@ impl Loader {
 		let path = BOOT.plugin_dir.join(format!("{name}.yazi/init.lua"));
 		let b = fs::read(path).await.map(|v| v.into()).or_else(|_| {
 			Ok(Cow::from(match name {
-				"noop" => include_bytes!("../preset/plugins/noop.lua") as &[u8],
-				"archive" => include_bytes!("../preset/plugins/archive.lua"),
+				"archive" => include_bytes!("../preset/plugins/archive.lua") as &[u8],
 				"code" => include_bytes!("../preset/plugins/code.lua"),
+				"file" => include_bytes!("../preset/plugins/file.lua"),
 				"folder" => include_bytes!("../preset/plugins/folder.lua"),
 				"image" => include_bytes!("../preset/plugins/image.lua"),
 				"json" => include_bytes!("../preset/plugins/json.lua"),
 				"mime" => include_bytes!("../preset/plugins/mime.lua"),
+				"noop" => include_bytes!("../preset/plugins/noop.lua"),
 				"pdf" => include_bytes!("../preset/plugins/pdf.lua"),
 				"video" => include_bytes!("../preset/plugins/video.lua"),
 				_ => bail!("plugin not found: {name}"),