Added `selectionhighlight` plugin

1 files changed, 26 insertions, 0 deletions

diff --git a/plugins/selectionhighlight.lua b/plugins/selectionhighlight.lua
new file mode 100644
index 0000000..31a5042
--- /dev/null
+++ b/plugins/selectionhighlight.lua
@@ -0,0 +1,26 @@
+local style = require "core.style"
+local DocView = require "core.docview"
+
+-- originally written by luveti
+
+local draw_line_body = DocView.draw_line_body
+
+function DocView:draw_line_body(idx, x, y)
+  local line1, col1, line2, col2 = self.doc:get_selection(true)
+  if line1 == line2 and col1 ~= col2 then
+    local lh = self:get_line_height()
+    local selected_text = self:get_cached_line(line1).text:sub(col1, col2 - 1)
+    local current_line_text = self:get_cached_line(idx).text
+    local last_col = 1
+    while true do
+      local start_col, end_col = current_line_text:find(selected_text, last_col, true)
+      if start_col == nil then break end
+      local x1 = x + self:get_col_x_offset(idx, start_col)
+      local x2 = x + self:get_col_x_offset(idx, end_col + 1)
+      renderer.draw_rect(x1, y, x2 - x1, lh, style.selection)
+      last_col = end_col + 1
+    end
+  end
+  draw_line_body(self, idx, x, y)
+end
+