2 files changed, 91 insertions, 1 deletions
diff --git a/lua/clever_f/direct_preview_planner.lua b/lua/clever_f/direct_preview_planner.lua
index e771b15..6735924 100644
--- a/lua/clever_f/direct_preview_planner.lua
+++ b/lua/clever_f/direct_preview_planner.lua
@@ -149,6 +149,41 @@ function M.case_grouping_settings(settings)
   }
 end
 
+function M.validate_marker_positions(view, positions)
+  require_view(view)
+  if type(positions) ~= "table" then
+    fail("direct preview markers must be a list of positions", 2)
+  end
+
+  local result = {}
+  local seen = {}
+  local item_count = 0
+  for key, position in pairs(positions) do
+    if type(key) ~= "number"
+      or key ~= math.floor(key)
+      or key < 1
+      or key > #positions
+    then
+      fail("direct preview markers must be a list of positions", 2)
+    end
+    position = domain.Position.coerce(position)
+    if not view:is_character_start(position) then
+      fail("direct preview marker must start an editor character", 2)
+    end
+    local identity = tostring(position.line) .. ":" .. tostring(position.byte_column)
+    if seen[identity] then
+      fail("direct preview marker positions must be unique", 2)
+    end
+    seen[identity] = true
+    result[key] = position
+    item_count = item_count + 1
+  end
+  if item_count ~= #positions then
+    fail("direct preview markers must be a list of positions", 2)
+  end
+  return result
+end
+
 function DirectPreviewPlanner:plan(view, origin, descriptor, count, settings)
   local grouping = M.case_grouping_settings(settings)
   local ignore_case = grouping.ignore_case
@@ -181,7 +216,7 @@ function DirectPreviewPlanner:plan(view, origin, descriptor, count, settings)
       positions[#positions + 1] = M.marker_position(descriptor, record.position)
     end
   end
-  return positions
+  return M.validate_marker_positions(view, positions)
 end
 
 function M.new(options)
diff --git a/lua/clever_f/feedback_service.lua b/lua/clever_f/feedback_service.lua
index e8c387d..b1a4233 100644
--- a/lua/clever_f/feedback_service.lua
+++ b/lua/clever_f/feedback_service.lua
@@ -201,6 +201,54 @@ function FeedbackService:create_cursor_presentation_lease(enabled)
   return new_cursor_presentation_lease(record.host, supported == true)
 end
 
+local function position_list(positions)
+  if type(positions) ~= "table" then
+    fail("direct marker positions must be a list", 3)
+  end
+  local result = {}
+  local item_count = 0
+  for key, position in pairs(positions) do
+    if type(key) ~= "number"
+      or key ~= math.floor(key)
+      or key < 1
+      or key > #positions
+    then
+      fail("direct marker positions must be a list", 3)
+    end
+    result[key] = domain.Position.coerce(position)
+    item_count = item_count + 1
+  end
+  if item_count ~= #positions then
+    fail("direct marker positions must be a list", 3)
+  end
+  return result
+end
+
+function FeedbackService:create_direct_markers(positions, window)
+  positions = position_list(positions)
+  if #positions == 0 then
+    return nil
+  end
+  if window == nil then
+    fail("direct marker window must identify its host window", 2)
+  end
+
+  local record = service_records[self]
+  local identity = record.host:create_highlight({
+    group = "CleverFDirect",
+    window = window,
+    positions = positions,
+    priority = M.overlay_priority("CleverFDirect"),
+  })
+  record.transitions:AddTemporaryOverlay(identity, window, "CleverFDirect")
+  return {
+    identity = identity,
+    window = window,
+    group = "CleverFDirect",
+    positions = positions,
+  }
+end
+
 function FeedbackService:create_cursor_marker(position, window)
   position = domain.Position.coerce(position)
   if window == nil then
@@ -307,6 +355,13 @@ function FeedbackService:ensure_default_label()
   }
 end
 
+function FeedbackService:evaluate_highlights()
+  return {
+    default_label = self:ensure_default_label(),
+    feature_links = self:evaluate_feature_links(),
+  }
+end
+
 function M.new(options)
   return FeedbackService.new(options)
 end