Harpoon buffer integration

[MarcelRobitaille]

I've integrated harpoon into the lualine buffers component. This way, if a buffer is in your harpoon list, it will show the harpoon number in superscript next to the buffer number. The use case is to quickly jump to a file in your harpoon list by its number (usually, these numbers are kept to a minimum unlike buffer numbers which can grow to hundreds).

init.lua and zshrc and 1 and 2 in the list, so 1 and 2 are shown next to their buffer number.

This is half show and tell and half a question: what's the best way for me to share this? I don't really want to create an extension that adds a new harpoonbuffers component because the code would be 99% identical.

Here is essentially all the code:

  local harpoon_number = require('harpoon.mark').get_index_of(self.file)
  if harpoon_number == nil then
     return string.format('%s%s %s%s%s', self.alternate_file_icon, self.bufnr or '', self.icon, name, self.modified_icon)
  else
     return string.format('%s%s%s %s%s%s', self.alternate_file_icon, self.bufnr or '', superscript_numbers[harpoon_number], self.icon, name, self.modified_icon)
  end

To-do:

• Add setting to enable and disable this
• Gracefully handle require('harpoon.mark') failing
• Support all modes, not just 4
• Also add a harpoon extension to show something nicer than harpoon-menu in the buffers list
• Support numbers bigger than 9