local vimrc = {}



local autocmd_callbacks = {}
vimrc.autocmd_callbacks = autocmd_callbacks

function vimrc.autocmd(event, filter, callback)
   local callback_id = #autocmd_callbacks + 1
   autocmd_callbacks[callback_id] = callback
   vim.cmd(('autocmd Vimrc %s %s lua vimrc.autocmd_callbacks[%d]()'):format(
      event,
      filter,
      callback_id))
end



function vimrc.after_ftplugin(ft, callback)
   local var_name = 'did_ftplugin_' .. ft .. '_after'
   if vim.b[var_name] ~= nil then
      return
   end

   callback(conf)

   vim.b[var_name] = true
end



local SPACE = true
local TAB = false

local indentation_settings = {
   c          = { style = SPACE, width = 4 },
   cmake      = { style = SPACE, width = 2 },
   cpp        = { style = SPACE, width = 4 },
   css        = { style = SPACE, width = 2 },
   go         = { style = TAB,   width = 4 },
   haskell    = { style = SPACE, width = 4 },
   html       = { style = SPACE, width = 2 },
   javascript = { style = SPACE, width = 2 },
   json       = { style = SPACE, width = 2 },
   lisp       = { style = SPACE, width = 2 },
   lua        = { style = SPACE, width = 3 },
   markdown   = { style = SPACE, width = 4 },
   php        = { style = SPACE, width = 2 },
   python     = { style = SPACE, width = 4 },
   ruby       = { style = SPACE, width = 2 },
   toml       = { style = SPACE, width = 2 },
   typescript = { style = SPACE, width = 2 },
   vim        = { style = SPACE, width = 4 },
   yaml       = { style = SPACE, width = 2 },
}

function vimrc.register_filetype_autocmds_for_indentation()
   for ft, setting in pairs(indentation_settings) do
      vim.cmd(([[autocmd Vimrc FileType %s call v:lua.vimrc._set_indentation(%s, %d)]]):format(
         ft,
         setting.style and 'v:true' or 'v:false',
         setting.width
      ))
   end
end

function vimrc._set_indentation(style, width)
   vim.bo.expandtab = style
   vim.bo.tabstop = width
   vim.bo.shiftwidth = width
   vim.bo.softtabstop = width

   if vim.fn.exists(':IndentLinesReset') == 2 then
      vim.cmd('IndentLinesReset')
   end
end



return vimrc