feat: add option to show indexes in bufferline

lua/hardline.lua

@@ -16,6 +16,7 @@ M.options = {
   bufferline = false,
   bufferline_settings = {
       exclude_terminal = false,
+      show_index = false,
   },
   theme = 'default',
   sections = {
@@ -153,10 +154,11 @@ end
 -------------------- BUFFERLINE ----------------------------
 function M.update_bufferline()
   local sections = {}
-  local buffers = bufferline.get_buffers(M.options.bufferline_settings)
+  local settings = M.options.bufferline_settings
+  local buffers = bufferline.get_buffers(settings)
   local separator = '|'
   for i, buffer in ipairs(buffers) do
-    table.insert(sections, bufferline.to_section(buffer))
+    table.insert(sections, bufferline.to_section(buffer, i, settings))
     if i < #buffers then
       table.insert(sections, separator)
     end

lua/hardline/bufferline.lua

@@ -40,7 +40,7 @@ local function unique_tail(buffers)
   unique_tail(buffers)
 end
 
-local function to_section(buffer)
+local function to_section(buffer, idx, settings)
   local flags = {}
   local item = buffer.name == '' and '[No Name]' or buffer.name
   if buffer.flags.modified then
@@ -54,9 +54,14 @@ local function to_section(buffer)
   end
   flags = table.concat(flags)
   item = flags == '' and item or fmt('%s %s', item, flags)
+  if settings.show_index then
+    item = fmt(' %d:%s ', idx, item)
+  else
+    item = fmt(' %s ', item)
+  end
   return {
     class = 'bufferline',
-    item = fmt(' %s ', item),
+    item = item,
     modified = buffer.flags.modified,
     current = buffer.current,
   }