Feature: allow to configure window options as functions

doc/navbuddy.txt

@@ -64,7 +64,7 @@ Use |navbuddy.setup| to override any of the default options
 		have nerd-fonts.
 
 	window: table
-		Set options related to window's "border", "size", "position".
+		Set options related to window's "border", "relative", "size", "position".
 
 	node_markers: table
 		Indicate whether a node is a leaf or branch node. Default icons assume
@@ -112,8 +112,16 @@ Defaults >lua
 			border = "single",  -- "rounded", "double", "solid", "none"
 								-- or an array with eight chars building up the border in a clockwise fashion
 								-- starting with the top-left corner. eg: { "╔", "═" ,"╗", "║", "╝", "═", "╚", "║" }.
+
+			relative = "editor" -- "editor", "cursor", "win", "buf"
+								-- or a function returning a relative value or table (current window as parameter)
+
 			size = "60%",       -- Or table format example: { height = "40%", width = "100%"}
+								-- or a function returning a size value or table (current window as parameter)
+
 			position = "50%",   -- Or table format example: { row = "100%", col = "0%"}
+								-- or a function returning a position value or table (current window as parameter)
+
 			scrolloff = nil,    -- scrolloff value within navbuddy window
 			sections = {
 				left = {

lua/nvim-navbuddy/actions.lua

@@ -650,12 +650,21 @@ function actions.help()
 	local callback = function(display)
 		display:close()
 
+		local relative = display.config.window.relative
+		relative = type(relative) == "function" and relative(display.for_win) or relative
+
+		local position = display.config.window.position
+		position = type(position) == "function" and position(display.for_win) or position
+
+		local size = display.config.window.size
+		size = type(size) == "function" and size(display.for_win) or size
+
 		local nui_popup = require("nui.popup")
 
 		local help_popup = nui_popup({
-			relative = "editor",
-			position = display.config.window.position,
-			size = display.config.window.size,
+			relative = relative,
+			position = position,
+			size = size,
 			enter = true,
 			focusable = true,
 			border = display.config.window.border,

lua/nvim-navbuddy/display.lua

@@ -142,11 +142,20 @@ function display:new(obj)
 		},
 	})
 
+	local relative = config.window.relative
+	relative = type(relative) == "function" and relative(obj.for_win) or relative
+
+	local position = config.window.position
+	position = type(position) == "function" and position(obj.for_win) or position
+
+	local size = config.window.size
+	size = type(size) == "function" and size(obj.for_win) or size
+
 	local layout = nui_layout(
 		{
-			relative = "editor",
-			position = config.window.position,
-			size = config.window.size,
+			relative = relative,
+			position = position,
+			size = size,
 		},
 		nui_layout.Box({
 			nui_layout.Box(left_popup, { size = config.window.sections.left.size }),

lua/nvim-navbuddy/init.lua

@@ -8,6 +8,7 @@ local actions = require("nvim-navbuddy.actions")
 local config = {
 	window = {
 		border = "single",
+		relative = "editor",
 		size = "60%",
 		position = "50%",
 		scrolloff = nil,