Added `drawwhitespace` plugin

1 files changed, 29 insertions, 0 deletions

diff --git a/plugins/drawwhitespace.lua b/plugins/drawwhitespace.lua
new file mode 100644
index 0000000..b121833
--- /dev/null
+++ b/plugins/drawwhitespace.lua
@@ -0,0 +1,29 @@
+local config = require "core.config"
+local style = require "core.style"
+local DocView = require "core.docview"
+
+-- originally written by luveti
+
+config.whitespace_map = { [" "] = "·", ["\t"] = "»" }
+
+local draw_line_text = DocView.draw_line_text
+
+function DocView:draw_line_text(idx, x, y)
+  draw_line_text(self, idx, x, y)
+
+  local cl = self:get_cached_line(idx)
+  local tx, ty = x, y + self:get_line_text_y_offset()
+  local font = self:get_font()
+  local color = style.whitespace or style.syntax.comment
+  local map = config.whitespace_map
+
+  for i = 1, #cl.text do
+    local chr = cl.text:sub(i, i)
+    local rep = map[chr]
+    if rep then
+      renderer.draw_text(font, rep, tx, ty, color)
+    end
+    tx = tx + font:get_width(chr)
+  end
+end
+