feat: add counter for currently selected/cut/copied files to the header

yazi-config/preset/theme.toml

@@ -28,6 +28,11 @@ tab_active   = { fg = "black", bg = "lightblue" }
 tab_inactive = { fg = "white", bg = "darkgray" }
 tab_width    = 1
 
+# Selected counter
+count_selected = { fg = "white", bg = "green" }
+count_copied = { fg = "white", bg = "yellow" }
+count_cut      = { fg = "white", bg = "red" }
+
 # Border
 border_symbol = "│"
 border_style  = { fg = "gray" }

yazi-config/src/theme/theme.rs

@@ -31,6 +31,11 @@ pub struct Manager {
 	#[validate(range(min = 1, message = "Must be greater than 0"))]
 	tab_width:    u8,
 
+    // Selected counter
+    count_selected: Style,
+    count_copied: Style,
+    count_cut: Style,
+
 	// Border
 	pub border_symbol: String,
 	pub border_style:  Style,

yazi-plugin/preset/components/header.lua

@@ -11,7 +11,48 @@ function Header:cwd()
 	else
 		span = ui.Span(string.format("%s (search: %s)", ya.readable_path(tostring(cwd)), cwd:frag()))
 	end
-	return span:style(THEME.manager.cwd)
+	return span:style(THEME.manager.mode_normal)
+end
+
+function Header:selected_count()
+	local selected = 0
+	local copied = 0
+	local cut = 0
+
+	for _, f in ipairs(Folder:by_kind(Folder.CURRENT).window) do
+		if f:is_selected() then
+			selected = selected + 1
+		end
+
+		local is_yanked = f:is_yanked()
+		if is_yanked == 1 then
+			copied = copied + 1
+		elseif is_yanked == 2 then
+			cut = cut + 1
+		end
+	end
+
+	local count
+	local style
+	if cut > 0 then
+		count = cut
+		style = THEME.manager.count_cut
+	elseif copied > 0 then
+		count = copied
+		style = THEME.manager.count_copied
+	else
+		count = selected
+		style = THEME.manager.count_selected
+	end
+
+	if count == 0 then
+		return ui.Line({})
+	else
+		return ui.Line({
+			ui.Span(string.format(" %s ", count)):style(style),
+			ui.Span(" "),
+		})
+	end
 end
 
 function Header:tabs()
@@ -42,8 +83,8 @@ end
 function Header:render(area)
 	local chunks = self:layout(area)
 
-	local left = ui.Line { self:cwd() }
-	local right = ui.Line { self:tabs() }
+	local left = ui.Line({ self:cwd() })
+	local right = ui.Line({ self:selected_count(), self:tabs() })
 	return {
 		ui.Paragraph(chunks[1], { left }),
 		ui.Paragraph(chunks[2], { right }):align(ui.Paragraph.RIGHT),