Add function to place signs in buffer

lua/jj_mini_diff/init.lua

@@ -80,6 +80,33 @@ local function _parse_diff_output(diff_output)
   return added_lines, changed_lines, deleted_lines
 end
 
+-- Place signs in the current buffer
+local function _place_signs_in_buffer()
+  local buf_nr = vim.api.nvim_get_current_buf()
+  vim.fn.sign_unplace("jj_mini_diff", { buffer = buf_nr }) -- Clear existing signs
+
+  local diff_output = _get_jj_diff_for_buffer()
+  if not diff_output then
+    return
+  end
+
+  local added, changed, deleted = _parse_diff_output(diff_output)
+
+  local sign_id = 1
+  for _, line_num in ipairs(added) do
+    vim.fn.sign_place(sign_id, "jj_mini_diff", "JjDiffAdd", buf_nr, { lnum = line_num })
+    sign_id = sign_id + 1
+  end
+  for _, line_num in ipairs(changed) do
+    vim.fn.sign_place(sign_id, "jj_mini_diff", "JjDiffChange", buf_nr, { lnum = line_num })
+    sign_id = sign_id + 1
+  end
+  for _, line_num in ipairs(deleted) do
+    vim.fn.sign_place(sign_id, "jj_mini_diff", "JjDiffDelete", buf_nr, { lnum = line_num })
+    sign_id = sign_id + 1
+  end
+end
+
 
 function M.setup(opts)
   opts = opts or {}