FTplugin: regex -> TS markdown headings grepper

ftplugin/markdown.lua

@@ -57,17 +57,33 @@ local function fzf_lua_markdown_headings()
   local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
   local headings = {}
 
-  for lnum, line in ipairs(lines) do
-    local heading = line:match('^(#+%s+.+)$')
-    if heading then
-      vim.notify("Found heading: " .. heading, vim.log.levels.INFO)
-      table.insert(headings, {
-        lnum = lnum,
-        text = heading,
-        display = string.format("%4d: %s", lnum, heading)
-      })
-    end
+  -- Check if treesitter parser is available
+  local ok, parser = pcall(vim.treesitter.get_parser, bufnr, 'markdown')
+  if not ok or not parser then
+    vim.notify("Treesitter markdown parser not available", vim.log.levels.ERROR)
+    return
   end
+
+  local query = vim.treesitter.query.parse('markdown', [[
+    (atx_heading
+      (atx_h1_marker)) @heading
+  ]])
+
+  local tree = parser:parse()[1]
+  local root = tree:root()
+
+  for id, node in query:iter_captures(root, bufnr, 0, -1) do
+    local start_row, start_col, end_row, end_col = node:range()
+    local lnum = start_row + 1 -- Treesitter is 0-indexed, Vim is 1-indexed
+    local text = vim.treesitter.get_node_text(node, bufnr)
+
+    table.insert(headings, {
+      lnum = lnum,
+      text = text,
+      display = string.format("%4d: %s", lnum, text)
+    })
+  end
+
   picker.fzf_exec(function(fzf_cb)
     for _, heading in ipairs(headings) do
       fzf_cb(heading.display)