Initial commit

data/plugins/trimwhitespace.lua

@@ -0,0 +1,29 @@
+local core = require "core"
+local command = require "core.command"
+local Doc = require "core.doc"
+
+
+local function trim_trailing_whitespace(doc)
+  for i = 1, #doc.lines do
+    local old_text = doc:get_text(i, 1, i, math.huge)
+    local new_text = old_text:gsub("%s*$", "")
+    if old_text ~= new_text then
+      doc:insert(i, 1, new_text)
+      doc:remove(i, #new_text + 1, i, math.huge)
+    end
+  end
+end
+
+
+command.add("core.docview", {
+  ["trim-whitespace:trim-trailing-whitespace"] = function()
+    trim_trailing_whitespace(self.active_view.doc)
+  end,
+})
+
+
+local save = Doc.save
+Doc.save = function(self, ...)
+  trim_trailing_whitespace(self)
+  save(self, ...)
+end