feat: add diff.yazi plugin

diff.yazi/init.lua

@@ -0,0 +1,37 @@
+local function info(content)
+	return ya.notify {
+		title = "Diff",
+		content = content,
+		timeout = 5,
+	}
+end
+
+local selected_url = ya.sync(function()
+	for _, u in pairs(cx.active.selected) do
+		return u
+	end
+end)
+
+local hovered_url = ya.sync(function()
+	local h = cx.active.current.hovered
+	return h and h.url
+end)
+
+return {
+	entry = function()
+		local a, b = selected_url(), hovered_url()
+		if not a then
+			return info("No file selected")
+		elseif not b then
+			return info("No file hovered")
+		end
+
+		local output, err = Command("diff"):arg("-Naur"):arg(tostring(a)):arg(tostring(b)):output()
+		if not output then
+			return info("Failed to run diff, error: " .. err)
+		end
+
+		ya.clipboard(output.stdout)
+		info("Diff copied to clipboard")
+	end,
+}