Split out reload functionality to actual document, and added in a thread to check the document, in the cases where it wouldn't be covered by dirwatch.

data/core/commands/doc.lua

@@ -466,6 +466,10 @@ local commands = {
       command.perform("doc:save-as")
     end
   end,
+  
+  ["doc:reload"] = function()
+    doc():reload()
+  end,
 
   ["file:rename"] = function()
     local old_filename = doc().filename

data/core/doc/init.lua

@@ -80,6 +80,16 @@ function Doc:load(filename)
 end
 
 
+function Doc:reload()
+  if self.filename then
+    local sel = { self:get_selection() }
+    self:load(self.filename)
+    self:clean()
+    self:set_selection(table.unpack(sel))
+  end
+end
+
+
 function Doc:save(filename, abs_filename)
   if not filename then
     assert(self.filename, "no filename set to default to")

data/plugins/autoreload.lua

@@ -14,17 +14,8 @@ local function update_time(doc)
 end
 
 local function reload_doc(doc)
-  local fp = io.open(doc.filename, "r")
+  doc:reload()
-  local text = fp:read("*a")
-  fp:close()
-
-  local sel = { doc:get_selection() }
-  doc:remove(1, 1, math.huge, math.huge)
-  doc:insert(1, 1, text:gsub("\r", ""):gsub("\n$", ""))
-  doc:set_selection(table.unpack(sel))
-
   update_time(doc)
-  doc:clean()
   core.log_quiet("Auto-reloaded doc \"%s\"", doc.filename)
 end
 
@@ -41,20 +32,23 @@ local function check_prompt_reload()
   end
 end
 
+local function check_if_modified(doc)
+  local info = system.get_file_info(doc.filename or "")
+  if info and times[doc] ~= info.modified then
+    if not doc:is_dirty() then
+      reload_doc(doc)
+    else
+      doc.deferred_reload = true
+    end
+  end
+end
+
 local on_check = dirwatch.check
 function dirwatch:check(change_callback, ...)
   on_check(self, function(dir)
     for _, doc in ipairs(core.docs) do
       if dir == common.dirname(doc.abs_filename) then
-        local info = system.get_file_info(doc.filename or "")
+        check_if_modified(doc)
-        if info and times[doc] ~= info.modified then
-          if not doc:is_dirty() then
-            reload_doc(doc)
-          else
-            doc.deferred_reload = true
-          end
-          break
-        end
       end
     end
     change_callback(dir)
@@ -62,10 +56,28 @@ function dirwatch:check(change_callback, ...)
   check_prompt_reload()
 end
 
+
 local set_active_view = core.set_active_view
 function core.set_active_view(view)
   set_active_view(view)
   check_prompt_reload()
+  if view.doc and view.doc.abs_filename then
+    local should_poll = true
+    for i,v in ipairs(core.project_directories) do
+      if view.doc.abs_filename:find(v.name, 1, true) == 1 and not v.files_limit then
+        should_poll = false
+      end
+    end
+    if should_poll then
+      local doc = core.active_view.doc
+      core.add_thread(function()
+        while core.active_view.doc == doc do
+          check_if_modified(doc)
+          coroutine.yield(0.25)
+        end
+      end)
+    end
+  end
 end
 
 -- patch `Doc.save|load` to store modified time