Added in lineguide to core.

data/core/config.lua

@@ -29,5 +29,6 @@ config.tab_close_button = true
 -- Disable plugin loading setting to false the config entry
 -- of the same name.
 config.trimwhitespace = false
+config.lineguide = false
 
 return config

data/plugins/lineguide.lua

@@ -0,0 +1,21 @@
+-- mod-version:1 -- lite-xl 1.16
+local config = require "core.config"
+local style = require "core.style"
+local DocView = require "core.docview"
+
+local draw_overlay = DocView.draw_overlay
+
+function DocView:draw_overlay(...)
+  local ns = ("n"):rep(config.line_limit)
+  local ss = self:get_font():subpixel_scale()
+  local offset = self:get_font():get_width_subpixel(ns) / ss
+  local x = self:get_line_screen_position(1) + offset
+  local y = self.position.y
+  local w = math.ceil(SCALE * 1)
+  local h = self.size.y
+
+  local color = style.guide or style.selection
+  renderer.draw_rect(x, y, w, h, color)
+
+  draw_overlay(self, ...)
+end