Added ./plugins/centerdoc.lua

1 files changed, 19 insertions, 0 deletions

diff --git a/plugins/centerdoc.lua b/plugins/centerdoc.lua
new file mode 100644
index 0000000..1921467
--- /dev/null
+++ b/plugins/centerdoc.lua
@@ -0,0 +1,19 @@
+local config = require "core.config"
+local DocView = require "core.docview"
+
+
+local draw_line_gutter = DocView.draw_line_gutter
+local get_gutter_width = DocView.get_gutter_width
+
+
+function DocView:draw_line_gutter(idx, x, y)
+  local offset = self:get_gutter_width() - get_gutter_width(self)
+  draw_line_gutter(self, idx, x + offset, y)
+end
+
+
+function DocView:get_gutter_width()
+  local real_gutter_width = get_gutter_width(self)
+  local width = real_gutter_width + self:get_font():get_width("n") * config.line_limit
+  return math.max((self.size.x - width) / 2, real_gutter_width)
+end