fix(dates): Fix parsing dates from headlines

Fixes #796 #797

lua/orgmode/files/headline.lua

@@ -665,9 +665,10 @@ end
 memoize('get_non_plan_dates')
 ---@return OrgDate[]
 function Headline:get_non_plan_dates()
-  local section = self:node():parent()
+  local headline_node = self:node()
+  local section = headline_node:parent()
   local body = section and section:field('body')[1]
-  local headline_text = self.file:get_node_text(self:_get_child_node('item')) or ''
+  local headline_text = self.file:get_node_text(headline_node) or ''
   local dates = Date.parse_all_from_line(headline_text, self:node():start() + 1)
   local properties_node = section and section:field('property_drawer')[1]
 
@@ -684,7 +685,7 @@ function Headline:get_non_plan_dates()
   end
 
   local start_line = body:range()
-  local lines = self.file:get_node_text_list(body)
+  local lines = self.file:get_node_text_list(body, ts_utils.range_with_zero_start_col(body))
   for i, line in ipairs(lines) do
     local line_dates = Date.parse_all_from_line(line, start_line + i)
     local is_clock_line = line:match('^%s*:?CLOCK:') ~= nil

lua/orgmode/utils/treesitter/init.lua

@@ -121,6 +121,17 @@ function M.node_to_lsp_range(node)
   return rtn
 end
 
+---Return the range of the given node, but override the start column to be 0.
+---This is needed when we want to parse the lines manually to ensure that
+---we parse from the start of the line
+---@param node TSNode
+---@return number[]
+function M.range_with_zero_start_col(node)
+  local range = { node:range() }
+  range[2] = 0
+  return range
+end
+
 -- Memoizes a function based on the buffer tick of the provided bufnr.
 -- The cache entry is cleared when the buffer is detached to avoid memory leaks.
 -- The options argument is a table with one optional value:

tests/plenary/files/headline_spec.lua

@@ -53,4 +53,35 @@ describe('Headline', function()
       assert.are.same('headline_2_category', file:get_headlines()[2]:get_category())
     end)
   end)
+
+  describe('get_all_dates', function()
+    it('should properly parse dates from the headline and body', function()
+      local file = helpers.create_file({
+        '* TODO testing <2024-08-17 Sat>',
+        'DEADLINE: <2024-08-19 Mon>',
+        '* stuff <2024-01-17 Wed>',
+        '  <2024-02-17 Sat>',
+        '  <2024-03-18 Sun>',
+      })
+
+      local assert_range = function(date, expected_range)
+        assert.are.same(expected_range[1], date.range.start_line, 'Start line is not matching')
+        assert.are.same(expected_range[2], date.range.start_col, 'Start col is not matching')
+        assert.are.same(expected_range[3], date.range.end_line, 'End line is not matching')
+        assert.are.same(expected_range[4], date.range.end_col, 'End col is not matching')
+      end
+
+      local first_headline_dates = file:get_headlines()[1]:get_all_dates()
+      assert.are.same(2, #first_headline_dates)
+      assert_range(first_headline_dates[1], { 2, 11, 2, 26 })
+      assert_range(first_headline_dates[2], { 1, 16, 1, 31 })
+
+      local second_headline_dates = file:get_headlines()[2]:get_all_dates()
+      assert.are.same(3, #second_headline_dates)
+      -- First date in the list is is always a plan date
+      assert_range(second_headline_dates[1], { 4, 3, 4, 18 })
+      assert_range(second_headline_dates[2], { 3, 9, 3, 24 })
+      assert_range(second_headline_dates[3], { 5, 3, 5, 18 })
+    end)
+  end)
 end)