lineguide: added config spec

data/plugins/lineguide.lua

@@ -14,6 +14,56 @@ config.plugins.lineguide = common.merge({
     -- 100,
     -- 120,
     config.line_limit
+  },
+  -- The config specification used by gui generators
+  config_spec = {
+    name = "Line Guide",
+    {
+      label = "Enabled",
+      description = "Disable or enable drawing of the line guide.",
+      path = "enabled",
+      type = "toggle",
+      default = true
+    },
+    {
+      label = "Width",
+      description = "Width in pixels of the line guide.",
+      path = "width",
+      type = "number",
+      default = 2,
+      min = 1
+    },
+    {
+      label = "Ruler Positions",
+      description = "The different column numbers for the line guides to draw.",
+      path = "rulers",
+      type = "list_strings",
+      default = { tostring(config.line_limit) or "80" },
+      get_value = function(rulers)
+        if type(rulers) == "table" then
+          local new_rulers = {}
+          for _, ruler in ipairs(rulers) do
+            table.insert(new_rulers, tostring(ruler))
+          end
+          return new_rulers
+        else
+          return { tostring(config.line_limit) }
+        end
+      end,
+      set_value = function(rulers)
+        local new_rulers = {}
+        for _, ruler in ipairs(rulers) do
+          local number = tonumber(ruler)
+          if number then
+            table.insert(new_rulers, number)
+          end
+        end
+        if #new_rulers == 0 then
+          table.insert(new_rulers, config.line_limit)
+        end
+        return new_rulers
+      end
+    }
   }
 }, config.plugins.lineguide)
 
@@ -31,7 +81,13 @@ local draw_overlay = DocView.draw_overlay
 function DocView:draw_overlay(...)
   draw_overlay(self, ...)
 
-  if config.plugins.lineguide.enabled and not self:is(CommandView) then
+  if
+    type(config.plugins.lineguide) == "table"
+    and
+    config.plugins.lineguide.enabled
+    and
+    not self:is(CommandView)
+  then
     local line_x = self:get_line_screen_position(1)
     local character_width = self:get_font():get_width("n")
     local ruler_width = config.plugins.lineguide.width