Wrap on comma

lua/argonaut/init.lua

@@ -34,7 +34,7 @@ local function reflow()
 
     local new_range = Range.find_at_cursor(range.start_cursor)
     assert(new_range)
-    new_range:hit_search(trace, 1):set_current()
+    new_range:hit_search(trace, 1).cursor:set_current()
 
     return true
 end
@@ -42,7 +42,9 @@ end
 local function inspect()
     local range = Range.find_closest()
     if range then
-        local trace = range:hit_test(Cursor.get_current())
+        local trace = range:hit_test(
+            Cursor.get_current()
+        )
         assert(trace)
         dump(trace)
     end

lua/argonaut/param.lua

@@ -23,8 +23,17 @@ function ParamCursorCell:hit_search(trace, depth)
     local frame = trace[depth]
     assert(frame.type == 'cursor_cell')
     assert(frame.char == self.cursor:get_value())
+    assert(depth == #trace)
 
-    return self.cursor
+    return self
+end
+
+function ParamCursorCell:is_before_cursor(cursor)
+    return self.cursor < cursor
+end
+
+function ParamCursorCell:is_after_cursor(cursor)
+    return self.cursor > cursor
 end
 
 function ParamCursorCell:get_start_row()
@@ -59,11 +68,23 @@ function ParamRangeCell:hit_test(cursor)
     end
 end
 
+function ParamRangeCell:is_before_cursor(cursor)
+    return self.range.start_cursor < cursor
+end
+
+function ParamRangeCell:is_after_cursor(cursor)
+    return self.range.stop_cursor > cursor
+end
+
 function ParamRangeCell:hit_search(trace, depth)
     local frame = trace[depth]
     assert(frame.type == 'range_cell')
 
+    if depth == #trace then
+        return self
+    else
         return self.range:hit_search(trace, depth + 1)
+    end
 end
 
 function ParamRangeCell:get_start_row()
@@ -136,10 +157,13 @@ function Param:hit_search(trace, depth)
     local frame = trace[depth]
     assert(frame.type == 'param')
 
+    if depth == #trace then
+        return self
+    else
         local index_clamped = frame.cell_index + self:find_index_begin() - 1
         assert(index_clamped <= #self.cells)
-
         return self.cells[index_clamped]:hit_search(trace, depth + 1)
+    end
 end
 
 function Param:write(builder, wrapped)
@@ -148,6 +172,18 @@ function Param:write(builder, wrapped)
     end
 end
 
+function Param:is_before_cursor(cursor)
+    if #self.cells > 0 then
+        return self.cells[1]:is_before_cursor(cursor)
+    end
+end
+
+function Param:is_after_cursor(cursor)
+    if #self.cells > 0 then
+        return self.cells[#self.cells]:is_after_cursor(cursor)
+    end
+end
+
 function Param:get_previous()
     if self.index > 1 then
         return self.range.params[self.index - 1]

lua/argonaut/range.lua

@@ -120,6 +120,23 @@ function Range:hit_test(cursor)
             param_index = 0,
         }
 
+        if cursor == self.start_cursor and self.params[1]:is_after_cursor(cursor) then
+            cursor = cursor:get_next()
+        elseif cursor == self.stop_cursor and self.params[#self.params]:is_before_cursor(cursor) then
+            cursor = cursor:get_previous()
+        end
+
+        for i = 2, #self.params do
+            local current_param = self.params[i]
+            local previous_param = self.params[i - 1]
+            if previous_param:is_before_cursor(cursor) and current_param:is_after_cursor(cursor) then
+                if not previous_param:hit_test(cursor) and not current_param:hit_test(cursor) then
+                    cursor = cursor:get_previous()
+                    break
+                end
+            end
+        end
+
         for i, param in pairs(self.params) do
             local trace = param:hit_test(cursor)
             if trace then
@@ -128,8 +145,6 @@ function Range:hit_test(cursor)
                 return trace
             end
         end
-
-        return {frame}
     end
 end
 
@@ -140,8 +155,8 @@ function Range:hit_search(trace, depth)
     assert(frame.param_count == #self.params)
     assert(frame.param_index <= #self.params)
 
-    if frame.param_index == 0 then
-        return self.start_cursor
+    if depth == #trace then
+        return self
     else
         return self.params[frame.param_index]:hit_search(trace, depth + 1)
     end